feat(machine): consume operator fee config over kind-30078 (#57)

Layer 3 of the operator-configurable fee architecture (parent
aiolabs/satmachineadmin#37). Replaces the hardcoded
`ref(0.0333)` / `ref(0.0777)` constants in `atm.ts` with a Nostr-
delivered, operator-pushed fee config sourced from satmachineadmin.

Wire envelope (locked with sat-side at #39 + coord log 2026-06-01):

  kind=30078 (NIP-78 replaceable), NIP-44 v2 encrypted
  d-tag: bitspire-fees:<atm_pubkey_hex>
  ["p", atm_pubkey], signed by operator account
  watermark: event.created_at (no envelope-level published_at)

  Plaintext:
    { schema_version: 1,
      cash_in_fee_fraction: …,    sum ≤ 0.15
      cash_out_fee_fraction: …,   sum ≤ 0.15
      components: { super_cash_in, super_cash_out,
                    operator_cash_in, operator_cash_out } }

Consumer-side invariants:
- Signature + author whitelist + watermark + clock-skew gates
- 15% per-direction hardcoded cap (defense in depth with sat's
  producer-side refuse-to-publish at the same threshold)
- Consistency assert when `components` present: sum of super+operator
  must equal each total within 1e-6; drift logs WARN + still applies
  (totals are authoritative — see coord log §`07:33Z` and §`14:25Z`)
- Unknown top-level keys silently ignored (v2 forward-compat for
  future promo additions); absent `schema_version` treated as v1
- Apply-mid-transaction defers to next tx by XState's context-snapshot
  boundary; no explicit timer/lock code needed

Persistence (state.db schema v9→v10):
- New `fee_config` singleton row (id=1) with the totals, schema_version,
  event_created_at watermark, and applied_at audit timestamp.
- New `meta.lastKnownFeeConfigCreatedAt` row — independent from the
  cassette watermark per the d-tag-per-lifecycle convention.
- Super/operator components are NOT persisted on the ATM —
  satmachineadmin is the canonical audit substrate per Layer 1 #38
  (dumb-machine / smart-server split, see coord log §`07:56Z`). The
  breakdown survives in the parser's receipt log line in journalctl
  for offline forensics.

Fail-closed posture:
- First boot with no persisted config + no inbound event →
  `initError = 'awaiting-fees'` → maintenance screen ("Awaiting fee
  configuration from operator. Contact operator to publish initial
  fee config."). Matches path-B `roster_required` posture.
- Persisted config present + relay unreachable → ATM operates with
  the persisted values; subscriber catches up when relay returns.

Env-var fallback dropped:
- `VITE_CASH_IN_FEE` / `VITE_CASH_OUT_FEE` no longer read by the
  Electron main process. Operator-config-over-Nostr is the single
  source of truth — removes the env-vs-Nostr ambiguity surface.
- `parseFee` helper deleted (was its only caller).

Subscriber wired into all three init paths (Lightning-only,
direct-HAL, HAL-via-IPC) alongside the existing cassette-config
subscriber from #56. `onApply` callback receives just the totals
(components stay parser-side per the architectural split above).

IPC surface:
- state:get-fee-config → persisted singleton or null
- state:get-last-known-fee-config-created-at → watermark
- state:apply-fee-config → atomic upsert + watermark advance

Closes aiolabs/lamassu-next#57.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/machine/electron/main.ts

@@ -27,7 +27,12 @@ import {
   getBootstrapPublishedAt,
   markBootstrapPublished,
   applyOperatorCassettesConfig,
+  getFeeConfig,
+  getLastKnownFeeConfigCreatedAt,
+  applyFeeConfig,
   type OperatorCassettesPayload,
+  type FeeConfigPayload,
+  type FeeConfigRow,
   type ApplyResult,
 } from './state-store.js'
 import { initializeHal, type HalInstance } from './hal-service.js'
@@ -36,12 +41,6 @@ import { initializeHal, type HalInstance } from './hal-service.js'
 const __filename = fileURLToPath(import.meta.url)
 const __dirname = path.dirname(__filename)
 
-/** Parse fee value: accepts percentage (5.55 → 0.0555) or decimal (0.0555 → 0.0555) */
-function parseFee(val: string): number {
-  const n = parseFloat(val)
-  return n >= 1 ? n / 100 : n
-}
-
 // Load .env file manually (Electron main process doesn't have Vite's env loading)
 function loadEnvFile() {
   const envPath = path.join(__dirname, '..', '.env')
@@ -303,9 +302,10 @@ ipcMain.handle('get-config', () => {
     // Maintenance mode — show "out of service" screen
     maintenanceMode: process.env.VITE_MAINTENANCE_MODE === 'true',
 
-    // Fee rates — accepts percentage (5.55) or decimal (0.0555), auto-detected
+    // Fee rates — operator-pushed via Nostr (kind-30078 `bitspire-fees:<atm_pubkey>`)
-    cashInFeeFraction: parseFee(process.env.VITE_CASH_IN_FEE || '0.0333'),
+    // from satmachineadmin; see aiolabs/lamassu-next#57. No env-var fallback —
-    cashOutFeeFraction: parseFee(process.env.VITE_CASH_OUT_FEE || '0.0777'),
+    // first boot without a persisted fee config (and no inbound event) shows
+    // a maintenance screen until the operator publishes initial config.
 
     // Operator branding (logo/title/theme) — null when no override
     branding: loadBranding(),
@@ -367,6 +367,20 @@ ipcMain.handle(
     applyOperatorCassettesConfig(payload, eventCreatedAt)
 )
 
+// Operator-fees consumer (aiolabs/lamassu-next#57) — persisted singleton
+// fee config + per-d-tag replay watermark + atomic apply for kind-30078
+// `bitspire-fees:<atm_pubkey>` events. Independent from the cassette
+// watermark/apply path per the d-tag-per-lifecycle convention.
+ipcMain.handle('state:get-fee-config', (): FeeConfigRow | null => getFeeConfig())
+ipcMain.handle('state:get-last-known-fee-config-created-at', (): number =>
+  getLastKnownFeeConfigCreatedAt()
+)
+ipcMain.handle(
+  'state:apply-fee-config',
+  (_event, payload: FeeConfigPayload, eventCreatedAt: number): ApplyResult =>
+    applyFeeConfig(payload, eventCreatedAt)
+)
+
 // Support pages — read .md files from /var/lib/bitspire/support/
 ipcMain.handle('support:get-pages', () => {
   const supportDir = path.join(

apps/machine/electron/preload.ts

@@ -110,6 +110,26 @@ contextBridge.exposeInMainWorld('electronAPI', {
   ): Promise<{ applied: true } | { applied: false; reason: string }> =>
     ipcRenderer.invoke('state:apply-operator-cassettes-config', payload, eventCreatedAt),
 
+  // Operator-fees consumer (aiolabs/lamassu-next#57)
+  getFeeConfig: (): Promise<{
+    cashInFeeFraction: number
+    cashOutFeeFraction: number
+    schemaVersion: number
+    eventCreatedAt: number
+    appliedAt: number
+  } | null> => ipcRenderer.invoke('state:get-fee-config'),
+  getLastKnownFeeConfigCreatedAt: (): Promise<number> =>
+    ipcRenderer.invoke('state:get-last-known-fee-config-created-at'),
+  applyFeeConfig: (
+    payload: {
+      cashInFeeFraction: number
+      cashOutFeeFraction: number
+      schemaVersion: number
+    },
+    eventCreatedAt: number
+  ): Promise<{ applied: true } | { applied: false; reason: string }> =>
+    ipcRenderer.invoke('state:apply-fee-config', payload, eventCreatedAt),
+
   // Support pages
   getSupportPages: (): Promise<{ id: string; title: string; content: string }[]> =>
     ipcRenderer.invoke('support:get-pages'),
@@ -198,6 +218,22 @@ declare global {
         payload: { positions: Record<string, { denomination: number; count: number }> },
         eventCreatedAt: number
       ) => Promise<{ applied: true } | { applied: false; reason: string }>
+      getFeeConfig: () => Promise<{
+        cashInFeeFraction: number
+        cashOutFeeFraction: number
+        schemaVersion: number
+        eventCreatedAt: number
+        appliedAt: number
+      } | null>
+      getLastKnownFeeConfigCreatedAt: () => Promise<number>
+      applyFeeConfig: (
+        payload: {
+          cashInFeeFraction: number
+          cashOutFeeFraction: number
+          schemaVersion: number
+        },
+        eventCreatedAt: number
+      ) => Promise<{ applied: true } | { applied: false; reason: string }>
       getSupportPages: () => Promise<{ id: string; title: string; content: string }[]>
       // HAL hardware IPC
       halInit: (config: any) => Promise<{ success: boolean; error?: string }>

apps/machine/electron/state-store.ts

@@ -15,7 +15,7 @@ import fs from 'node:fs'
 
 let db: Database.Database | null = null
 
-const SCHEMA_VERSION = '9'
+const SCHEMA_VERSION = '10'
 
 function getDbPath(): string {
   const prodDir = '/var/lib/bitspire'
@@ -105,6 +105,15 @@ export function initDatabase(dbPath?: string): void {
       created_at INTEGER NOT NULL,
       completed_at INTEGER
     );
+
+    CREATE TABLE IF NOT EXISTS fee_config (
+      id INTEGER PRIMARY KEY CHECK (id = 1),
+      cash_in_fee_fraction REAL NOT NULL,
+      cash_out_fee_fraction REAL NOT NULL,
+      schema_version INTEGER NOT NULL DEFAULT 1,
+      event_created_at INTEGER NOT NULL,
+      applied_at INTEGER NOT NULL
+    );
   `)
 
   // Seed meta + cashbox if first run, or run migrations
@@ -276,6 +285,41 @@ export function initDatabase(dbPath?: string): void {
     db.pragma('foreign_keys = ON')
     db.prepare('UPDATE meta SET value = ? WHERE key = ?').run('9', 'schema_version')
     console.log('[StateStore] Migrated schema v8 → v9 (cassettes PK position; allow duplicate denominations)')
+    existing.value = '9'
+  }
+
+  if (existing && existing.value === '9') {
+    // Migration v9 → v10: operator-pushed fee config consumer
+    // (aiolabs/lamassu-next#57).
+    //   - fee_config table — singleton row (id=1) carrying the last
+    //     applied cash-in/cash-out fee fractions. Persisted so a restart
+    //     restores the operator's policy without waiting on relay. The
+    //     super/operator breakdown is NOT mirrored here — satmachineadmin
+    //     is the canonical audit substrate for the split per settlement
+    //     (Layer 1 #38). See coord log 2026-06-01T07:56Z for the dumb-
+    //     machine/smart-server rationale (the components stay on the
+    //     wire — they get parser-side consistency-asserted + logged at
+    //     receipt — but don't propagate beyond the parse boundary).
+    //   - meta.lastKnownFeeConfigCreatedAt — replay-protection watermark
+    //     (separate from `lastKnownConfigCreatedAt` for cassettes, per
+    //     d-tag-per-lifecycle convention). Default 0 = "fresh ATM,
+    //     nothing applied yet → fail-closed into maintenance screen."
+    db.exec(`
+      CREATE TABLE IF NOT EXISTS fee_config (
+        id INTEGER PRIMARY KEY CHECK (id = 1),
+        cash_in_fee_fraction REAL NOT NULL,
+        cash_out_fee_fraction REAL NOT NULL,
+        schema_version INTEGER NOT NULL DEFAULT 1,
+        event_created_at INTEGER NOT NULL,
+        applied_at INTEGER NOT NULL
+      );
+    `)
+    db.prepare('INSERT OR IGNORE INTO meta (key, value) VALUES (?, ?)').run(
+      'lastKnownFeeConfigCreatedAt',
+      '0'
+    )
+    db.prepare('UPDATE meta SET value = ? WHERE key = ?').run('10', 'schema_version')
+    console.log('[StateStore] Migrated schema v9 → v10 (added fee_config + watermark)')
   }
 
   // Defensive: a fresh install at SCHEMA_VERSION skips all migrations.
@@ -283,6 +327,7 @@ export function initDatabase(dbPath?: string): void {
   const seedMeta = db.prepare('INSERT OR IGNORE INTO meta (key, value) VALUES (?, ?)')
   seedMeta.run('lastKnownConfigCreatedAt', '0')
   seedMeta.run('bootstrapPublishedAt', '')
+  seedMeta.run('lastKnownFeeConfigCreatedAt', '0')
 
   const cashboxRow = db.prepare('SELECT id FROM cashbox WHERE id = 1').get()
   if (!cashboxRow) {
@@ -440,6 +485,146 @@ export function applyOperatorCassettesConfig(
   return { applied: true }
 }
 
+// ---------------------------------------------------------------------------
+// Fee config — operator-pushed fee fractions (aiolabs/lamassu-next#57)
+// ---------------------------------------------------------------------------
+
+export interface FeeConfigRow {
+  cashInFeeFraction: number
+  cashOutFeeFraction: number
+  schemaVersion: number
+  /** Watermark — the event's created_at (NIP-78 replaceable event timestamp). */
+  eventCreatedAt: number
+  /** Local Date.now() at the moment this row was upserted via IPC. Triage primitive. */
+  appliedAt: number
+}
+
+/**
+ * Read the last-applied operator fee config. Returns null when no event
+ * has ever been applied (fresh ATM, pre-operator-publish). The renderer
+ * uses null → maintenance screen ("Awaiting fee configuration from
+ * operator") per the fail-closed posture from issue #57.
+ */
+export function getFeeConfig(): FeeConfigRow | null {
+  if (!db) throw new Error('Database not initialized')
+  const row = db
+    .prepare(
+      'SELECT cash_in_fee_fraction, cash_out_fee_fraction, schema_version, event_created_at, applied_at FROM fee_config WHERE id = 1'
+    )
+    .get() as
+    | {
+        cash_in_fee_fraction: number
+        cash_out_fee_fraction: number
+        schema_version: number
+        event_created_at: number
+        applied_at: number
+      }
+    | undefined
+  if (!row) return null
+  return {
+    cashInFeeFraction: row.cash_in_fee_fraction,
+    cashOutFeeFraction: row.cash_out_fee_fraction,
+    schemaVersion: row.schema_version,
+    eventCreatedAt: row.event_created_at,
+    appliedAt: row.applied_at,
+  }
+}
+
+/**
+ * Read replay-protection watermark. Returns 0 if no fee config has ever
+ * been applied. Separate from `lastKnownConfigCreatedAt` (cassettes) per
+ * the d-tag-per-lifecycle convention — independent watermarks isolate
+ * blast radius across operator-pushed config types.
+ */
+export function getLastKnownFeeConfigCreatedAt(): number {
+  if (!db) throw new Error('Database not initialized')
+  const row = db
+    .prepare('SELECT value FROM meta WHERE key = ?')
+    .get('lastKnownFeeConfigCreatedAt') as { value: string } | undefined
+  return row ? Number(row.value) || 0 : 0
+}
+
+export interface FeeConfigPayload {
+  cashInFeeFraction: number
+  cashOutFeeFraction: number
+  schemaVersion: number
+}
+
+/**
+ * Atomic apply of an operator-published fee config (aiolabs/lamassu-next#57).
+ *
+ * Caller has already verified the event signature, decrypted the content,
+ * enforced the per-direction 15% cap, and ignored any unknown top-level
+ * keys (v2 forward-compat). This function:
+ *
+ * 1. Rechecks replay-protection against `meta.lastKnownFeeConfigCreatedAt`
+ *    (defense-in-depth — caller should have done this too).
+ * 2. Re-validates both fractions are in [0, 0.15] (defense in depth — the
+ *    renderer-side cap is the primary check; the state-store guard catches
+ *    bypass via a buggy or tampered renderer).
+ * 3. In a single SQLite transaction: upserts the singleton fee_config row
+ *    AND advances `meta.lastKnownFeeConfigCreatedAt` to `eventCreatedAt`.
+ */
+const FEE_CAP_PER_DIRECTION = 0.15
+
+export function applyFeeConfig(
+  payload: FeeConfigPayload,
+  eventCreatedAt: number
+): ApplyResult {
+  if (!db) throw new Error('Database not initialized')
+
+  const watermark = getLastKnownFeeConfigCreatedAt()
+  if (eventCreatedAt <= watermark) {
+    return {
+      applied: false,
+      reason: `event.created_at (${eventCreatedAt}) <= lastKnownFeeConfigCreatedAt (${watermark})`,
+    }
+  }
+
+  const rangeChecks: [string, number][] = [
+    ['cash_in_fee_fraction', payload.cashInFeeFraction],
+    ['cash_out_fee_fraction', payload.cashOutFeeFraction],
+  ]
+  for (const [name, value] of rangeChecks) {
+    if (!Number.isFinite(value) || value < 0 || value > FEE_CAP_PER_DIRECTION) {
+      return {
+        applied: false,
+        reason: `${name} out of range [0, ${FEE_CAP_PER_DIRECTION}]: ${value}`,
+      }
+    }
+  }
+  if (!Number.isInteger(payload.schemaVersion) || payload.schemaVersion < 1) {
+    return { applied: false, reason: `invalid schema_version: ${payload.schemaVersion}` }
+  }
+  if (!Number.isInteger(eventCreatedAt) || eventCreatedAt < 0) {
+    return { applied: false, reason: `invalid event_created_at: ${eventCreatedAt}` }
+  }
+
+  const upsert = db.prepare(
+    'INSERT INTO fee_config (id, cash_in_fee_fraction, cash_out_fee_fraction, schema_version, event_created_at, applied_at) VALUES (1, ?, ?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET cash_in_fee_fraction = excluded.cash_in_fee_fraction, cash_out_fee_fraction = excluded.cash_out_fee_fraction, schema_version = excluded.schema_version, event_created_at = excluded.event_created_at, applied_at = excluded.applied_at'
+  )
+  const setWatermark = db.prepare('UPDATE meta SET value = ? WHERE key = ?')
+
+  const run = db.transaction(() => {
+    upsert.run(
+      payload.cashInFeeFraction,
+      payload.cashOutFeeFraction,
+      payload.schemaVersion,
+      eventCreatedAt,
+      Date.now()
+    )
+    setWatermark.run(String(eventCreatedAt), 'lastKnownFeeConfigCreatedAt')
+  })
+
+  run()
+  console.log(
+    `[StateStore] Applied fee config @ event_created_at=${eventCreatedAt} ` +
+      `cash_in=${payload.cashInFeeFraction} cash_out=${payload.cashOutFeeFraction} ` +
+      `schema=${payload.schemaVersion}`
+  )
+  return { applied: true }
+}
+
 // ---------------------------------------------------------------------------
 // Cassettes
 // ---------------------------------------------------------------------------

apps/machine/src/App.vue

@@ -142,17 +142,29 @@ function toggleLiveServices() {
         <line x1="12" y1="17" x2="12.01" y2="17" />
       </svg>
       <h1 class="text-2xl lg:text-[3.5rem] font-bold">
-        {{ atmStore.initError === 'maintenance' ? 'Under Service' : 'ATM Unavailable' }}
+        {{
+          atmStore.initError === 'maintenance'
+            ? 'Under Service'
+            : atmStore.initError === 'awaiting-fees'
+              ? 'Awaiting Configuration'
+              : 'ATM Unavailable'
+        }}
       </h1>
       <p class="max-w-md text-center text-base lg:text-2xl text-muted-foreground">
         {{
           atmStore.initError === 'maintenance'
             ? 'This machine is currently being serviced. We will be back shortly.'
+            : atmStore.initError === 'awaiting-fees'
+              ? 'Awaiting fee configuration from operator. Contact operator to publish initial fee config.'
               : 'This machine is temporarily out of service. Please try again later or use another machine.'
         }}
       </p>
       <p
-        v-if="atmStore.debugMode && atmStore.initError !== 'maintenance'"
+        v-if="
+          atmStore.debugMode &&
+          atmStore.initError !== 'maintenance' &&
+          atmStore.initError !== 'awaiting-fees'
+        "
         class="max-w-lg text-center font-mono text-sm text-destructive"
       >
         {{ atmStore.initError }}

apps/machine/src/services/operator-fees.ts

@@ -0,0 +1,354 @@
+/**
+ * Operator-fees consumer (aiolabs/lamassu-next#57).
+ *
+ * Sibling to `operator-config.ts` (cassette config) — same kind, same
+ * encryption envelope, different d-tag and payload shape. Subscribes to
+ * operator-published kind-30078 events carrying fee config updates,
+ * validates + persists them, and pushes the new fractions through a
+ * callback into the renderer store.
+ *
+ * Architecture (see ~/dev/coordination/log.md 2026-05-31 → 2026-06-01):
+ *
+ * - Operator → ATM: `kind=30078`, `["d", "bitspire-fees:<atm_pubkey_hex>"]`,
+ *   `["p", <atm_npub>]`, NIP-44 v2 encrypted content, author = operator pubkey.
+ * - Per-d-tag-per-lifecycle convention: independent watermark + independent
+ *   failure mode from cassette config. A malformed fee payload does NOT
+ *   brick cassette consumption (and vice versa).
+ *
+ * Wire payload (v1):
+ *
+ *   {
+ *     "schema_version": 1,
+ *     "cash_in_fee_fraction": 0.0633,
+ *     "cash_out_fee_fraction": 0.1077,
+ *     "components": {                     // informational + audit-feeding
+ *       "super_cash_in": 0.03,
+ *       "super_cash_out": 0.03,
+ *       "operator_cash_in": 0.0333,
+ *       "operator_cash_out": 0.0777
+ *     }
+ *   }
+ *
+ * `schema_version` MAY be absent — treat absence as v1 (per the
+ * contract direction lnbits proposed in §`07:00Z`). v1 consumers ignore
+ * unknown top-level keys (future-proofing for v2 promo fields).
+ *
+ * `components` MAY be absent — consumer-optional per the wire-format
+ * spec. When present, the parser runs a consistency assert (sum of
+ * super_*+operator_* must match the published total within 1e-6) and
+ * logs the breakdown on the receipt log line. The breakdown is NOT
+ * persisted on the ATM side — satmachineadmin is the canonical audit
+ * substrate for the super/operator split per settlement (Layer 1 of
+ * aiolabs/satmachineadmin#38). See coord log 2026-06-01T07:56Z for
+ * the dumb-machine / smart-server rationale.
+ *
+ * Hard cap: both fractions must be in [0, 0.15] per Padreug's 2026-06-01
+ * decision (between sat's 25% straw and lnbits's tighter lean). Events
+ * over cap → log + drop; prior persisted config remains authoritative.
+ *
+ * Apply-mid-transaction: the XState state machine snapshots
+ * `cashInFeeFraction` / `cashOutFeeFraction` into context at construction
+ * time, then reads `context.feeFraction` from the per-flow entry action
+ * for the lifetime of a transaction. A mid-flight ref update therefore
+ * does NOT propagate to the in-flight tx — it applies to the next one.
+ * Hold-until-completion is structurally free; no explicit deferral
+ * needed here.
+ */
+
+import {
+  type MachineIdentity,
+  type NostrClient,
+  type Event,
+  decryptContentV2,
+  validateEvent,
+} from '@bitSpire/nostr-client'
+
+import type {} from '@/types/electron'
+
+const KIND_NIP78 = 30078
+
+/** Accept operator events stamped up to this many seconds in the future. */
+const MAX_FUTURE_SKEW_S = 60
+
+/** Per-direction cap. Either fraction above this → reject as malformed. */
+const FEE_CAP_PER_DIRECTION = 0.15
+
+const feeConfigDTag = (machineId: string) => `bitspire-fees:${machineId}`
+
+const isElectron = typeof window !== 'undefined' && window.electronAPI !== undefined
+
+export interface OperatorFeesServiceConfig {
+  /** Connected NostrClient — shared with the Lightning service. */
+  nostrClient: NostrClient
+  /** ATM's nostr identity. Used to decrypt operator events. */
+  identity: MachineIdentity
+  /** Operator pubkeys (hex) authorized to publish fee config. From VITE_OPERATOR_PUBKEYS. */
+  operatorPubkeys: string[]
+  /** Machine identifier for the d-tag. Defaults to identity.publicKey when omitted. */
+  machineId?: string
+  /**
+   * Called when a valid fee-config event is applied. Renderer should
+   * mutate the pinia refs that back the state-machine fee fractions —
+   * XState's context-snapshot boundary defers the change to the next
+   * transaction (see file header).
+   */
+  onApply: (fees: { cashInFeeFraction: number; cashOutFeeFraction: number }) => void
+}
+
+export interface OperatorFeesService {
+  /** Unsubscribe from operator events and free resources. */
+  stop(): void
+}
+
+export async function startOperatorFeesService(
+  cfg: OperatorFeesServiceConfig
+): Promise<OperatorFeesService> {
+  if (cfg.operatorPubkeys.length === 0) {
+    console.log('[Fees] No operator pubkeys configured — service disabled')
+    return { stop: () => {} }
+  }
+  if (!isElectron || !window.electronAPI) {
+    console.log('[Fees] Not in Electron — service disabled (browser dev mode)')
+    return { stop: () => {} }
+  }
+  const api = window.electronAPI
+  const machineId = cfg.machineId ?? cfg.identity.publicKey
+
+  // Subscribe to operator-published fee config events.
+  const dTag = feeConfigDTag(machineId)
+  const subscriptionId = cfg.nostrClient.subscribe(
+    [
+      {
+        kinds: [KIND_NIP78],
+        '#p': [cfg.identity.publicKey],
+        '#d': [dTag],
+        authors: cfg.operatorPubkeys,
+      },
+    ],
+    {
+      onEvent: (event) => {
+        handleFeeConfigEvent(event, cfg, api).catch((err) => {
+          console.error('[Fees] Apply failed:', err)
+        })
+      },
+    }
+  )
+  console.log('[Fees] Subscribed:', { dTag, subscriptionId })
+
+  return {
+    stop: () => cfg.nostrClient.unsubscribe(subscriptionId),
+  }
+}
+
+interface ParsedFeePayload {
+  cashInFeeFraction: number
+  cashOutFeeFraction: number
+  superCashInFraction: number
+  superCashOutFraction: number
+  operatorCashInFraction: number
+  operatorCashOutFraction: number
+  schemaVersion: number
+}
+
+async function handleFeeConfigEvent(
+  event: Event,
+  cfg: OperatorFeesServiceConfig,
+  api: NonNullable<typeof window.electronAPI>
+): Promise<void> {
+  // 1. Signature + author whitelist (defense in depth — relay filter
+  //    already constrained authors, but verify the relay didn't lie).
+  if (!validateEvent(event)) {
+    console.warn('[Fees] Event signature invalid — dropped:', event.id)
+    return
+  }
+  if (!cfg.operatorPubkeys.includes(event.pubkey)) {
+    console.warn('[Fees] Author not in operator whitelist — dropped:', event.pubkey)
+    return
+  }
+
+  // 2. Replay protection — drop stale events. Independent watermark
+  //    from cassette config per the d-tag-per-lifecycle convention.
+  const watermark = await api.getLastKnownFeeConfigCreatedAt()
+  if (event.created_at <= watermark) {
+    console.log(
+      `[Fees] Stale event dropped (created_at=${event.created_at} <= watermark=${watermark})`
+    )
+    return
+  }
+
+  // 3. Clock-skew defense — reject events stamped too far in the future.
+  const nowSec = Math.floor(Date.now() / 1000)
+  if (event.created_at > nowSec + MAX_FUTURE_SKEW_S) {
+    console.warn(
+      `[Fees] Future-stamped event dropped (created_at=${event.created_at}, now=${nowSec})`
+    )
+    return
+  }
+
+  // 4. Decrypt + parse content (NIP-44 v2). Tolerates extra top-level
+  //    fields (v2 forward-compat — future promo payloads).
+  let parsed: ParsedFeePayload
+  try {
+    const plaintext = decryptContentV2(cfg.identity, event.pubkey, event.content)
+    const raw = JSON.parse(plaintext) as Record<string, unknown>
+    parsed = parseV1Payload(raw)
+  } catch (err) {
+    console.error('[Fees] Decrypt/parse failed:', err)
+    return
+  }
+
+  // 5. Per-direction cap — defense against operator typos AND a tampered
+  //    publisher. State-store re-validates at the IPC boundary.
+  if (
+    parsed.cashInFeeFraction > FEE_CAP_PER_DIRECTION ||
+    parsed.cashOutFeeFraction > FEE_CAP_PER_DIRECTION
+  ) {
+    console.warn(
+      `[Fees] Event rejected — fraction above ${FEE_CAP_PER_DIRECTION} cap ` +
+        `(cash_in=${parsed.cashInFeeFraction}, cash_out=${parsed.cashOutFeeFraction})`
+    )
+    return
+  }
+  if (parsed.cashInFeeFraction < 0 || parsed.cashOutFeeFraction < 0) {
+    console.warn(
+      `[Fees] Event rejected — negative fraction ` +
+        `(cash_in=${parsed.cashInFeeFraction}, cash_out=${parsed.cashOutFeeFraction})`
+    )
+    return
+  }
+
+  // 6. Atomic apply via IPC. State-store re-checks watermark + range
+  //    inside the SQLite transaction (defense in depth). Components
+  //    are NOT persisted — they stay on the wire for the consistency
+  //    assert + log line, but satmachineadmin is the canonical audit
+  //    substrate for the super/operator split.
+  const result = await api.applyFeeConfig(
+    {
+      cashInFeeFraction: parsed.cashInFeeFraction,
+      cashOutFeeFraction: parsed.cashOutFeeFraction,
+      schemaVersion: parsed.schemaVersion,
+    },
+    event.created_at
+  )
+  if (!result.applied) {
+    console.warn('[Fees] Apply rejected:', result.reason)
+    return
+  }
+
+  // 7. Push the new totals to the renderer store. XState's context-
+  //    snapshot boundary defers the change to the next transaction
+  //    (see file header).
+  cfg.onApply({
+    cashInFeeFraction: parsed.cashInFeeFraction,
+    cashOutFeeFraction: parsed.cashOutFeeFraction,
+  })
+
+  // The breakdown stays in this log line — journalctl is the forensic
+  // substrate for "what super/operator split was active at time T?"
+  // when satmachineadmin is unreachable.
+  console.log(
+    `[Fees] applied cash_in=${parsed.cashInFeeFraction} ` +
+      `(super=${parsed.superCashInFraction} operator=${parsed.operatorCashInFraction}) ` +
+      `cash_out=${parsed.cashOutFeeFraction} ` +
+      `(super=${parsed.superCashOutFraction} operator=${parsed.operatorCashOutFraction}) ` +
+      `schema=${parsed.schemaVersion} event_created_at=${event.created_at}`
+  )
+}
+
+/**
+ * Parse a v1 fee payload from an already-decoded JSON object. Tolerates
+ * extra unknown top-level keys (v2 forward-compat). Throws when the v1
+ * required fields are missing or shape-mismatched — caller logs + drops.
+ *
+ * `components` is consumer-optional per the wire-format spec — absence
+ * fills zeros (no audit data available for transactions under that
+ * fee config). When present, it must be a four-key sub-object with all
+ * fractions being finite non-negative numbers.
+ */
+function parseV1Payload(raw: Record<string, unknown>): ParsedFeePayload {
+  if (!raw || typeof raw !== 'object') {
+    throw new Error('payload not an object')
+  }
+  const cashIn = raw['cash_in_fee_fraction']
+  const cashOut = raw['cash_out_fee_fraction']
+  if (typeof cashIn !== 'number' || !Number.isFinite(cashIn)) {
+    throw new Error(`cash_in_fee_fraction missing or not a number: ${String(cashIn)}`)
+  }
+  if (typeof cashOut !== 'number' || !Number.isFinite(cashOut)) {
+    throw new Error(`cash_out_fee_fraction missing or not a number: ${String(cashOut)}`)
+  }
+  // Absent schema_version field is treated as v1 (per the contract
+  // direction from coordination log §`07:00Z` — cassette config shipped
+  // without one and is the principled default).
+  const schemaRaw = raw['schema_version']
+  const schemaVersion =
+    schemaRaw === undefined ? 1 : Number.isInteger(schemaRaw) ? (schemaRaw as number) : NaN
+  if (!Number.isInteger(schemaVersion) || schemaVersion < 1) {
+    throw new Error(`schema_version invalid: ${String(schemaRaw)}`)
+  }
+
+  let superCashIn = 0
+  let superCashOut = 0
+  let operatorCashIn = 0
+  let operatorCashOut = 0
+  const componentsRaw = raw['components']
+  if (componentsRaw === undefined) {
+    // Producer is v1-mandatory on `components` (locked in coord log §`14:25Z`).
+    // Falling through to zeros gracefully, but log WARN — this only fires on
+    // a hand-edited debug payload or a future producer impl with a bug.
+    console.warn(
+      '[Fees] payload missing `components` — applying totals with zero breakdown ' +
+        '(producer should always emit components in v1; check publisher)'
+    )
+  } else {
+    if (!componentsRaw || typeof componentsRaw !== 'object') {
+      throw new Error(`components present but not an object: ${String(componentsRaw)}`)
+    }
+    const components = componentsRaw as Record<string, unknown>
+    const pull = (key: string): number => {
+      const v = components[key]
+      if (typeof v !== 'number' || !Number.isFinite(v) || v < 0) {
+        throw new Error(`components.${key} missing or not a non-negative number: ${String(v)}`)
+      }
+      return v
+    }
+    superCashIn = pull('super_cash_in')
+    superCashOut = pull('super_cash_out')
+    operatorCashIn = pull('operator_cash_in')
+    operatorCashOut = pull('operator_cash_out')
+
+    // Consistency assert (coord log §`07:33Z` + §`14:25Z`): components MUST sum
+    // to the published totals within 1e-6. On drift: WARN + apply anyway, sums
+    // are authoritative. This catches producer rounding bugs / off-by-one
+    // composition / hand-edited debug payloads without bricking the consumer.
+    const sumIn = superCashIn + operatorCashIn
+    const sumOut = superCashOut + operatorCashOut
+    if (Math.abs(cashIn - sumIn) > 1e-6) {
+      console.warn(
+        `[Fees] payload internally inconsistent (producer bug): ` +
+          `cash_in_fee_fraction=${cashIn} != super_cash_in+operator_cash_in=${sumIn}; ` +
+          `applying total ${cashIn} (sum is authoritative)`
+      )
+    }
+    if (Math.abs(cashOut - sumOut) > 1e-6) {
+      console.warn(
+        `[Fees] payload internally inconsistent (producer bug): ` +
+          `cash_out_fee_fraction=${cashOut} != super_cash_out+operator_cash_out=${sumOut}; ` +
+          `applying total ${cashOut} (sum is authoritative)`
+      )
+    }
+  }
+
+  return {
+    cashInFeeFraction: cashIn,
+    cashOutFeeFraction: cashOut,
+    superCashInFraction: superCashIn,
+    superCashOutFraction: superCashOut,
+    operatorCashInFraction: operatorCashIn,
+    operatorCashOutFraction: operatorCashOut,
+    schemaVersion,
+  }
+}
+
+/** Exported for tests. Internal use only. */
+export const __testing = { parseV1Payload, FEE_CAP_PER_DIRECTION }

apps/machine/src/stores/atm.ts

@@ -14,6 +14,10 @@ import {
   startOperatorConfigService,
   type OperatorConfigService,
 } from '@/services/operator-config'
+import {
+  startOperatorFeesService,
+  type OperatorFeesService,
+} from '@/services/operator-fees'
 import type { HalConfig, HalServices } from '@/services/hal'
 import type { MachineModel } from '@/config'
 import type { LightningBackend } from '@/services/lightning'
@@ -287,8 +291,17 @@ export const useAtmStore = defineStore('atm', () => {
   const allowMockFallback = ref(true) // default true for browser dev
   const initError = ref<string | null>(null) // fatal error → maintenance screen
   const fiatCode = ref('USD')
-  const cashInFeeFraction = ref(0.0333)
+  // Defaults are 0 — the operator's fee config (received via Nostr
-  const cashOutFeeFraction = ref(0.0777)
+  // kind-30078 `bitspire-fees:<atm_pubkey>` envelope from satmachineadmin)
+  // is the source of truth. If no config is received and none persisted,
+  // the ATM refuses to operate (maintenance screen, see
+  // initializeForProduction below). See aiolabs/lamassu-next#57.
+  // The super/operator breakdown stays on the wire (consistency-asserted
+  // + log-line by the parser) but is NOT persisted on the ATM side —
+  // satmachineadmin is the canonical audit substrate per coord log
+  // 2026-06-01T07:56Z (dumb-machine / smart-server split).
+  const cashInFeeFraction = ref(0)
+  const cashOutFeeFraction = ref(0)
   const machineModel = ref('atm')
   const useLiveServices = ref(false)
   const connectionStatus = ref<'disconnected' | 'connecting' | 'connected' | 'error'>(
@@ -316,6 +329,20 @@ export const useAtmStore = defineStore('atm', () => {
   let lnurlCleanupFn: (() => void) | null = null
   // Operator-config consumer (aiolabs/lamassu-next#56) — set after Lightning init
   let operatorConfigSvc: OperatorConfigService | null = null
+  // Operator-fees consumer (aiolabs/lamassu-next#57) — set after Lightning init
+  let operatorFeesSvc: OperatorFeesService | null = null
+
+  /**
+   * Push a freshly-applied fee config from the operator-fees consumer
+   * into the renderer's reactive refs. XState's per-flow context-snapshot
+   * boundary defers the effective change to the next transaction (the
+   * in-flight flow keeps using its captured fractions). See operator-
+   * fees.ts file header for the full reasoning.
+   */
+  function applyFeeConfig(fees: { cashInFeeFraction: number; cashOutFeeFraction: number }) {
+    cashInFeeFraction.value = fees.cashInFeeFraction
+    cashOutFeeFraction.value = fees.cashOutFeeFraction
+  }
 
   /**
    * Persisted inventory loaded from SQLite — the source of truth for
@@ -633,6 +660,16 @@ export const useAtmStore = defineStore('atm', () => {
         identity: services.identity,
         operatorPubkeys: services.operatorPubkeys,
       })
+
+      // Start operator-fees consumer (aiolabs/lamassu-next#57) — subscribes
+      // to kind-30078 fee config events under bitspire-fees:<atm_pubkey>
+      operatorFeesSvc?.stop()
+      operatorFeesSvc = await startOperatorFeesService({
+        nostrClient: services.nostrClient,
+        identity: services.identity,
+        operatorPubkeys: services.operatorPubkeys,
+        onApply: applyFeeConfig,
+      })
     } catch (error) {
       console.error('[ATM] Failed to connect to Lightning.Pub:', error)
       connectionStatus.value = 'error'
@@ -936,6 +973,15 @@ export const useAtmStore = defineStore('atm', () => {
         operatorPubkeys: lightning.operatorPubkeys,
       })
 
+      // Operator-fees consumer (aiolabs/lamassu-next#57)
+      operatorFeesSvc?.stop()
+      operatorFeesSvc = await startOperatorFeesService({
+        nostrClient: lightning.nostrClient,
+        identity: lightning.identity,
+        operatorPubkeys: lightning.operatorPubkeys,
+        onApply: applyFeeConfig,
+      })
+
       console.log('[ATM] Fully initialized with HAL + Lightning')
     } catch (error) {
       console.error('[ATM] HAL initialization failed:', error)
@@ -977,9 +1023,29 @@ export const useAtmStore = defineStore('atm', () => {
     machineModel.value = model
     const runtimeFiatCode = runtimeConfig.fiatCode || 'USD'
     fiatCode.value = runtimeFiatCode
-    if (runtimeConfig.cashInFeeFraction !== undefined) cashInFeeFraction.value = runtimeConfig.cashInFeeFraction
+
-    if (runtimeConfig.cashOutFeeFraction !== undefined)
+    // Load persisted operator fee config (aiolabs/lamassu-next#57). If no
-      cashOutFeeFraction.value = runtimeConfig.cashOutFeeFraction
+    // config has ever been applied (fresh ATM, pre-operator-publish),
+    // fail-closed into maintenance screen. The operator-fees subscriber
+    // started below will unblock this once it receives a valid event from
+    // the operator's satmachineadmin (publish triggered by machine create
+    // / update / super-config change per aiolabs/satmachineadmin#39).
+    const persistedFees = await api.getFeeConfig()
+    if (persistedFees === null) {
+      initError.value = 'awaiting-fees'
+      console.warn(
+        '[ATM] No persisted fee config and no inbound event yet — entering maintenance state. ' +
+          'Operator must publish initial fee config via satmachineadmin.'
+      )
+      return
+    }
+    cashInFeeFraction.value = persistedFees.cashInFeeFraction
+    cashOutFeeFraction.value = persistedFees.cashOutFeeFraction
+    console.log(
+      `[ATM] Restored fee config from state.db: ` +
+        `cash_in=${persistedFees.cashInFeeFraction} cash_out=${persistedFees.cashOutFeeFraction} ` +
+        `(event_created_at=${persistedFees.eventCreatedAt})`
+    )
 
     // Build device config from runtime values
     const { getDeviceConfig, toHalConfig, MACHINE_PRESETS } = await import('@/config')
@@ -1205,6 +1271,15 @@ export const useAtmStore = defineStore('atm', () => {
         operatorPubkeys: lightning.operatorPubkeys,
       })
 
+      // Operator-fees consumer (aiolabs/lamassu-next#57)
+      operatorFeesSvc?.stop()
+      operatorFeesSvc = await startOperatorFeesService({
+        nostrClient: lightning.nostrClient,
+        identity: lightning.identity,
+        operatorPubkeys: lightning.operatorPubkeys,
+        onApply: applyFeeConfig,
+      })
+
       console.log('[ATM] Fully initialized with HAL (IPC) + Lightning')
     } catch (error) {
       console.error('[ATM] HAL initialization failed:', error)

apps/machine/src/types/electron.d.ts

@@ -21,8 +21,6 @@ export interface RuntimeConfig {
   allowMockFallback: boolean
   operatorPubkeys: string
   maintenanceMode: boolean
-  cashInFeeFraction: number
-  cashOutFeeFraction: number
   /** Operator branding override loaded from /var/lib/bitspire/branding/. Null when no override. */
   branding: BrandingConfig | null
 }
@@ -93,6 +91,22 @@ declare global {
         payload: { positions: Record<string, { denomination: number; count: number }> },
         eventCreatedAt: number
       ) => Promise<{ applied: true } | { applied: false; reason: string }>
+      getFeeConfig: () => Promise<{
+        cashInFeeFraction: number
+        cashOutFeeFraction: number
+        schemaVersion: number
+        eventCreatedAt: number
+        appliedAt: number
+      } | null>
+      getLastKnownFeeConfigCreatedAt: () => Promise<number>
+      applyFeeConfig: (
+        payload: {
+          cashInFeeFraction: number
+          cashOutFeeFraction: number
+          schemaVersion: number
+        },
+        eventCreatedAt: number
+      ) => Promise<{ applied: true } | { applied: false; reason: string }>
       getSupportPages: () => Promise<{ id: string; title: string; content: string }[]>
       // HAL hardware IPC
       halInit: (config: any) => Promise<{ success: boolean; error?: string }>