diff --git a/adapters/acp-adapter/package.json b/adapters/acp-adapter/package.json
index 8a52328..360c8f6 100644
--- a/adapters/acp-adapter/package.json
+++ b/adapters/acp-adapter/package.json
@@ -16,6 +16,7 @@
   "dependencies": {
     "@grey/core": "workspace:*",
     "@grey/pipeline": "workspace:*",
+    "@grey/schemas": "workspace:*",
     "@grey/x402-middleware": "workspace:*",
     "@virtuals-protocol/acp-node-v2": "^0.0.4",
     "pg": "^8.22.0",
diff --git a/adapters/acp-adapter/src/main.ts b/adapters/acp-adapter/src/main.ts
index 11bbd57..92ae1d8 100644
--- a/adapters/acp-adapter/src/main.ts
+++ b/adapters/acp-adapter/src/main.ts
@@ -6,8 +6,9 @@ import process from 'node:process';
 import { fileURLToPath } from 'node:url';
 import pg from 'pg';
 import { offeringHandlers, createHandlerDeps } from '@grey/core';
-import { PAID_SLUGS, priceUsdFor } from '@grey/x402-middleware';
+import { PAID_SLUGS } from '@grey/x402-middleware';
 import { loadConfig } from './config.js';
+import { priceUsdForAcp } from './pricing.js';
 import { AcpAdapter } from './acpAdapter.js';
 import { createRealSdkBundle } from './sdk.js';
 import { createLogger } from './logger.js';
@@ -60,10 +61,11 @@ async function main(): Promise<void> {
     reputationReconciler,
   });
 
-  // Register the 7 paid offerings from the single price source (invariant #20), BEFORE start() —
-  // no boot-buffer needed (one process; no cross-plugin registration race).
+  // Register the 7 paid offerings from the single canonical price source (Invariant #31),
+  // resolved through ACP's own networkMultiplier — BEFORE start() (one process; no cross-plugin
+  // registration race).
   for (const slug of PAID_SLUGS) {
-    adapter.registerOffering({ slug, priceUsd: priceUsdFor(slug) });
+    adapter.registerOffering({ slug, priceUsd: priceUsdForAcp(slug) });
   }
 
   log.info('acp-adapter: starting', {
diff --git a/adapters/acp-adapter/src/pricing.ts b/adapters/acp-adapter/src/pricing.ts
new file mode 100644
index 0000000..36c461e
--- /dev/null
+++ b/adapters/acp-adapter/src/pricing.ts
@@ -0,0 +1,14 @@
+// ACP's own price resolver (E1-A / Invariant #31) — resolves the ACP channel's networkMultiplier
+// (1.00×, grandfathered, no repricing) against @grey/schemas/pricing, the single canonical source.
+// Mirrors adapters/x402-middleware/src/prices.ts's resolution, kept separate per-adapter so a
+// future channel-specific multiplier (this file's `acp` vs. x402's `x402`) is a config entry in
+// @grey/schemas, not new code in either adapter.
+import type { PaidOfferingSlug } from '@grey/schemas/responses';
+import { resolvePriceUsd } from '@grey/schemas/pricing';
+
+const CHANNEL = 'acp' as const;
+
+/** USD price for a paid offering on the ACP channel. Throws on an unpriced offering (fail-closed). */
+export function priceUsdForAcp(slug: PaidOfferingSlug): number {
+  return resolvePriceUsd(slug, CHANNEL);
+}
diff --git a/adapters/acp-adapter/test/pricing.test.ts b/adapters/acp-adapter/test/pricing.test.ts
new file mode 100644
index 0000000..f997883
--- /dev/null
+++ b/adapters/acp-adapter/test/pricing.test.ts
@@ -0,0 +1,23 @@
+import { describe, it, expect } from 'vitest';
+import { priceUsdForAcp } from '../src/pricing.js';
+
+// E1-A: ACP resolves its own channel multiplier (1.00×, grandfathered) against the canonical
+// table in @grey/schemas/pricing — same values as before, now derived rather than hardcoded.
+const EXPECTED: Record<string, number> = {
+  legitimacy_scan: 0.25,
+  verify_whitepaper: 1.5,
+  verify_full_tech: 3.0,
+  claim_extraction: 0.75,
+  claim_history: 0.25,
+  quick_protocol_facts: 0.3,
+  daily_tech_brief: 8.0,
+};
+
+describe('priceUsdForAcp — ACP adapter boundary price resolution (Invariant #31)', () => {
+  it.each(Object.entries(EXPECTED))(
+    '%s resolves to the grandfathered 1.00× canonical price',
+    (slug, usd) => {
+      expect(priceUsdForAcp(slug as never)).toBe(usd);
+    },
+  );
+});
diff --git a/adapters/x402-middleware/package.json b/adapters/x402-middleware/package.json
index b77043c..8a948d2 100644
--- a/adapters/x402-middleware/package.json
+++ b/adapters/x402-middleware/package.json
@@ -15,6 +15,7 @@
     "test": "vitest run"
   },
   "dependencies": {
+    "@grey/schemas": "workspace:*",
     "fastify": "^5.8.5",
     "viem": "^2.53.1"
   }
diff --git a/adapters/x402-middleware/src/prices.ts b/adapters/x402-middleware/src/prices.ts
index f3d0aa7..86f6fe3 100644
--- a/adapters/x402-middleware/src/prices.ts
+++ b/adapters/x402-middleware/src/prices.ts
@@ -1,29 +1,48 @@
-// THE single price source (invariant #20). Every route price, the 402 `maxAmountRequired`,
-// and grey-core's envelope `costUsd` derive from this one table. No price literal lives
-// anywhere else. USD values are the authoritative OpenAPI `x-x402-pricing`; atomic units are
-// USDC (6 decimals). Kept as a string USD label + bigint atomic so no float rounding creeps in.
+// x402's price resolver (E1-A / Invariant #31). @grey/schemas/pricing is THE single canonical
+// price source (supersedes this file's old PRICE_TABLE literal, invariant #20 → #31); this file
+// resolves x402's networkMultiplier (1.00× today) at the adapter boundary and converts the
+// resolved USD to USDC atomic units. No price literal lives here anymore — PRICE_TABLE below is
+// derived, kept only so existing consumers (route registration, tests) don't need to change
+// shape. Every route price, the 402 `maxAmountRequired`, and grey-core's envelope `costUsd`
+// derive from this resolution. Atomic units are USDC (6 decimals).
+import type { PaidOfferingSlug } from '@grey/schemas/responses';
+import { resolvePriceUsd } from '@grey/schemas/pricing';
 import type { X402Network, UsdcAsset } from './types.js';
 
-export type PaidSlug =
-  | 'legitimacy_scan'
-  | 'verify_whitepaper'
-  | 'verify_full_tech'
-  | 'claim_extraction'
-  | 'claim_history'
-  | 'quick_protocol_facts'
-  | 'daily_tech_brief';
-
-export const PRICE_TABLE: Record<PaidSlug, { readonly usd: string; readonly atomic: bigint }> = {
-  legitimacy_scan: { usd: '0.25', atomic: 250_000n },
-  verify_whitepaper: { usd: '1.50', atomic: 1_500_000n },
-  verify_full_tech: { usd: '3.00', atomic: 3_000_000n },
-  claim_extraction: { usd: '0.75', atomic: 750_000n },
-  claim_history: { usd: '0.25', atomic: 250_000n },
-  quick_protocol_facts: { usd: '0.30', atomic: 300_000n },
-  daily_tech_brief: { usd: '8.00', atomic: 8_000_000n },
-};
+export type PaidSlug = PaidOfferingSlug;
+
+const CHANNEL = 'x402' as const;
+
+/** USD → USDC atomic units (6-dec), rounded to avoid float drift (e.g. 0.30 * 1e6 in IEEE754). */
+function toAtomic(usd: number): bigint {
+  return BigInt(Math.round(usd * 1_000_000));
+}
+
+function usdLabel(usd: number): string {
+  return usd.toFixed(2);
+}
+
+const PAID_SLUG_ORDER: PaidSlug[] = [
+  'legitimacy_scan',
+  'verify_whitepaper',
+  'verify_full_tech',
+  'claim_extraction',
+  'claim_history',
+  'quick_protocol_facts',
+  'daily_tech_brief',
+];
+
+/** Derived from @grey/schemas/pricing — NOT the source. Kept as a stable {usd,atomic} shape for
+ *  existing consumers/tests; recomputed from the canonical table + x402's networkMultiplier. */
+export const PRICE_TABLE: Record<PaidSlug, { readonly usd: string; readonly atomic: bigint }> =
+  Object.fromEntries(
+    PAID_SLUG_ORDER.map((slug) => {
+      const usd = resolvePriceUsd(slug, CHANNEL);
+      return [slug, { usd: usdLabel(usd), atomic: toAtomic(usd) }];
+    }),
+  ) as Record<PaidSlug, { readonly usd: string; readonly atomic: bigint }>;
 
-export const PAID_SLUGS = Object.keys(PRICE_TABLE) as PaidSlug[];
+export const PAID_SLUGS = [...PAID_SLUG_ORDER];
 
 export function isPaidSlug(slug: string): slug is PaidSlug {
   return Object.prototype.hasOwnProperty.call(PRICE_TABLE, slug);
@@ -32,13 +51,13 @@ export function isPaidSlug(slug: string): slug is PaidSlug {
 /** USDC atomic units (6-dec) required for a slug. Throws on unknown slug (fail-closed). */
 export function priceAtomicFor(slug: string): bigint {
   if (!isPaidSlug(slug)) throw new Error(`x402: no price for slug ${slug}`);
-  return PRICE_TABLE[slug].atomic;
+  return toAtomic(resolvePriceUsd(slug, CHANNEL));
 }
 
 /** USD price for a slug (grey-core envelope `costUsd`). Throws on unknown slug (fail-closed). */
 export function priceUsdFor(slug: string): number {
   if (!isPaidSlug(slug)) throw new Error(`x402: no price for slug ${slug}`);
-  return Number(PRICE_TABLE[slug].usd);
+  return resolvePriceUsd(slug as PaidSlug, CHANNEL);
 }
 
 /** Per-network USDC asset literals — the ONE place addresses + EIP-712 domains live.
diff --git a/packages/grey-core/src/orchestration/cacheOrLive.ts b/packages/grey-core/src/orchestration/cacheOrLive.ts
index ada0180..e02ac42 100644
--- a/packages/grey-core/src/orchestration/cacheOrLive.ts
+++ b/packages/grey-core/src/orchestration/cacheOrLive.ts
@@ -8,6 +8,7 @@
 // (§16). The run variants (runL1/runL1L2/runFullPipeline) are ordinary pipeline exports. The sole
 // sanctioned cross-boundary discovery-type reference lives in deps/index.ts (§15/§16).
 import type { ComputeOfferingSlug, RequestFor, DiscoveryStatus, DiscoveryAttempt } from '@grey/schemas';
+import { computeClassFor } from '@grey/schemas/pricing';
 import {
   runL1,
   runL1L2,
@@ -102,6 +103,16 @@ export async function cacheOrLive<O extends ComputeOfferingSlug>(
   input: RequestFor<O>,
   deps: HandlerDeps,
 ): Promise<HandlerResult> {
+  // Invariant #30, defense-in-depth: `O extends ComputeOfferingSlug` already makes a CACHE_ONLY
+  // slug uncallable at compile time (only the 4 live-capable offerings satisfy that constraint) —
+  // this is the runtime fail-closed backstop against the class violation, same posture as
+  // Invariant #27's fail-open guards elsewhere, inverted (fail closed, not open).
+  const computeClass = computeClassFor(offering);
+  if (computeClass === 'CACHE_ONLY') {
+    throw new Error(
+      `cacheOrLive: refusing live compute for CACHE_ONLY offering "${offering}" (Invariant #30) — no offering may be served below its computeClass floor, including a paid retry.`,
+    );
+  }
   const body = input as unknown as Record<string, unknown>;
   const tokenAddress = (body.token_address as string | undefined) ?? null;
   const projectName = body.project_name as string | undefined;
diff --git a/packages/grey-core/test/cacheOrLive.test.ts b/packages/grey-core/test/cacheOrLive.test.ts
index 0752493..ec08b56 100644
--- a/packages/grey-core/test/cacheOrLive.test.ts
+++ b/packages/grey-core/test/cacheOrLive.test.ts
@@ -180,6 +180,30 @@ describe('cacheOrLive — subject derivation', () => {
   });
 });
 
+describe('cacheOrLive — Invariant #30 (CACHE_ONLY never triggers live compute)', () => {
+  const CACHE_ONLY_SLUGS = ['claim_history', 'quick_protocol_facts', 'daily_tech_brief', 'daily_greenlight_list', 'scam_alert_feed'] as const;
+
+  for (const slug of CACHE_ONLY_SLUGS) {
+    it(`${slug} is structurally unreachable from cacheOrLive() — compile-time AND runtime rejection`, async () => {
+      const deps = fakeDeps({ discover: discovered });
+      // The type system already makes this uncallable (O extends ComputeOfferingSlug excludes
+      // every CACHE_ONLY slug) — the cast below simulates a bypass to prove the runtime
+      // fail-closed assertion is the actual backstop, not just the type constraint.
+      await expect(
+        cacheOrLive(slug as never, { token_address: TOKEN } as never, deps),
+      ).rejects.toThrow(/CACHE_ONLY/);
+      expect(runL1).not.toHaveBeenCalled();
+      expect(runL1L2).not.toHaveBeenCalled();
+      expect(runFullPipeline).not.toHaveBeenCalled();
+    });
+  }
+
+  it('rejects before any discovery/pipeline side effect runs, even on a "paid retry" shape', async () => {
+    const deps = fakeDeps({ discover: discovered });
+    await expect(cacheOrLive('scam_alert_feed' as never, {} as never, deps)).rejects.toThrow(/Invariant #30/);
+  });
+});
+
 describe('createHandlerDeps — M3.5 wiring sanity', () => {
   it('constructs HandlerDeps carrying pipeline + discovery (§15)', () => {
     const deps = createHandlerDeps({ databaseUrl: '' });
diff --git a/packages/grey-schemas/build.mjs b/packages/grey-schemas/build.mjs
index 2e13d08..d7a4944 100644
--- a/packages/grey-schemas/build.mjs
+++ b/packages/grey-schemas/build.mjs
@@ -13,6 +13,7 @@ await buildPackage({
     'src/requests/index.ts',
     'src/envelope/index.ts',
     'src/validators/index.ts',
+    'src/pricing/index.ts',
   ],
   // ajv 8.x has no `exports` map; its extensionless deep import must carry `.js` for Node ESM.
   alias: { 'ajv/dist/2020': 'ajv/dist/2020.js' },
diff --git a/packages/grey-schemas/package.json b/packages/grey-schemas/package.json
index 6d4dfbd..c08a3f2 100644
--- a/packages/grey-schemas/package.json
+++ b/packages/grey-schemas/package.json
@@ -11,6 +11,7 @@
     "./requests": { "types": "./dist/requests/index.d.ts", "default": "./dist/requests/index.js" },
     "./envelope": { "types": "./dist/envelope/index.d.ts", "default": "./dist/envelope/index.js" },
     "./validators": { "types": "./dist/validators/index.d.ts", "default": "./dist/validators/index.js" },
+    "./pricing": { "types": "./dist/pricing/index.d.ts", "default": "./dist/pricing/index.js" },
     "./openapi": "./openapi/openapi.yaml"
   },
   "files": ["dist", "openapi"],
diff --git a/packages/grey-schemas/src/pricing/index.ts b/packages/grey-schemas/src/pricing/index.ts
new file mode 100644
index 0000000..9f5f237
--- /dev/null
+++ b/packages/grey-schemas/src/pricing/index.ts
@@ -0,0 +1,10 @@
+// @grey/schemas/pricing — computeClass + canonical pricing barrel (E1-A, Invariant #30/#31).
+export type { ComputeClass, OfferingPricing, Channel } from './types';
+export {
+  PRICING_TABLE,
+  NETWORK_MULTIPLIER,
+  computeClassFor,
+  networkMultiplierFor,
+  canonicalUsdFor,
+  resolvePriceUsd,
+} from './table';
diff --git a/packages/grey-schemas/src/pricing/table.ts b/packages/grey-schemas/src/pricing/table.ts
new file mode 100644
index 0000000..21e99ce
--- /dev/null
+++ b/packages/grey-schemas/src/pricing/table.ts
@@ -0,0 +1,64 @@
+// @grey/schemas/pricing — the canonical price + computeClass table (E1-A). Supersedes
+// adapters/x402-middleware/src/prices.ts's PRICE_TABLE as the single source (Invariant #31);
+// that file now derives its (byte-identical) output from here instead of holding literals.
+//
+// Canonicalizes EXISTING values as-is (E1-A directive): no repricing on this phase. The 7 priced
+// values below are carried over unchanged from the prior PRICE_TABLE. `daily_greenlight_list` and
+// `scam_alert_feed` have no existing canonical price — canonicalUsd is `null`, flagged here for
+// Desktop to source before merge, not invented.
+import type { OfferingSlug } from '../responses/types';
+import type { Channel, ComputeClass, OfferingPricing } from './types';
+
+export const PRICING_TABLE: Record<OfferingSlug, OfferingPricing> = {
+  // LIVE_ALLOWED — resolve through cacheOrLive on a cache miss (grey-core/src/handlers/index.ts).
+  legitimacy_scan: { slug: 'legitimacy_scan', canonicalUsd: 0.25, computeClass: 'LIVE_ALLOWED' },
+  verify_whitepaper: { slug: 'verify_whitepaper', canonicalUsd: 1.5, computeClass: 'LIVE_ALLOWED' },
+  verify_full_tech: { slug: 'verify_full_tech', canonicalUsd: 3.0, computeClass: 'LIVE_ALLOWED' },
+  claim_extraction: { slug: 'claim_extraction', canonicalUsd: 0.75, computeClass: 'LIVE_ALLOWED' },
+
+  // CACHE_ONLY — structurally never reach cacheOrLive today (no call site passes them).
+  claim_history: { slug: 'claim_history', canonicalUsd: 0.25, computeClass: 'CACHE_ONLY' },
+  quick_protocol_facts: {
+    slug: 'quick_protocol_facts',
+    canonicalUsd: 0.3,
+    computeClass: 'CACHE_ONLY',
+  },
+  daily_tech_brief: { slug: 'daily_tech_brief', canonicalUsd: 8.0, computeClass: 'CACHE_ONLY' },
+  // UNPRICED — flagged for Desktop (E1-A directive); do not invent a number.
+  daily_greenlight_list: {
+    slug: 'daily_greenlight_list',
+    canonicalUsd: null,
+    computeClass: 'CACHE_ONLY',
+  },
+  scam_alert_feed: { slug: 'scam_alert_feed', canonicalUsd: null, computeClass: 'CACHE_ONLY' },
+};
+
+/** Spec §2.3: x402/Base and Virtuals ACP are both grandfathered at 1.00× — no repricing. */
+export const NETWORK_MULTIPLIER: Record<Channel, number> = {
+  x402: 1.0,
+  acp: 1.0,
+};
+
+export function computeClassFor(slug: OfferingSlug): ComputeClass {
+  return PRICING_TABLE[slug].computeClass;
+}
+
+export function networkMultiplierFor(channel: Channel): number {
+  return NETWORK_MULTIPLIER[channel];
+}
+
+/** Canonical USD price for a slug. Throws if unpriced (fail-closed — never silently 0/NaN). */
+export function canonicalUsdFor(slug: OfferingSlug): number {
+  const v = PRICING_TABLE[slug].canonicalUsd;
+  if (v === null) {
+    throw new Error(
+      `pricing: "${slug}" has no canonical price yet (flagged for Desktop, see E1-A PR)`,
+    );
+  }
+  return v;
+}
+
+/** Resolved USD price for a slug on a given channel: canonicalUsd × networkMultiplier. */
+export function resolvePriceUsd(slug: OfferingSlug, channel: Channel): number {
+  return canonicalUsdFor(slug) * networkMultiplierFor(channel);
+}
diff --git a/packages/grey-schemas/src/pricing/types.ts b/packages/grey-schemas/src/pricing/types.ts
new file mode 100644
index 0000000..a41e6fc
--- /dev/null
+++ b/packages/grey-schemas/src/pricing/types.ts
@@ -0,0 +1,22 @@
+// @grey/schemas/pricing — computeClass + canonical pricing types (E1-A, Invariant #30/#31).
+import type { OfferingSlug } from '../responses/types';
+
+/**
+ * Anti-dilution class (spec §2.2, Invariant #30). CACHE_ONLY offerings may never trigger live
+ * compute, including on a paid retry — enforced at the `cacheOrLive` boundary in @grey/core.
+ * No offering currently carries LIVE_PRIORITY (no premium-queue variant exists yet).
+ */
+export type ComputeClass = 'CACHE_ONLY' | 'LIVE_ALLOWED' | 'LIVE_PRIORITY';
+
+/**
+ * One canonical USD price per offering (spec §2.3, Invariant #31) — channel-agnostic. `null`
+ * means no canonical price has been sourced yet (flagged for Desktop, not a value to invent).
+ */
+export interface OfferingPricing {
+  readonly slug: OfferingSlug;
+  readonly canonicalUsd: number | null;
+  readonly computeClass: ComputeClass;
+}
+
+/** A channel this canonical price is realised on. Grows with each expansion (E2 Kite, E3 Olas, ...). */
+export type Channel = 'x402' | 'acp';
diff --git a/packages/grey-schemas/test/pricing.test.ts b/packages/grey-schemas/test/pricing.test.ts
new file mode 100644
index 0000000..e382a01
--- /dev/null
+++ b/packages/grey-schemas/test/pricing.test.ts
@@ -0,0 +1,90 @@
+import { describe, it, expect } from 'vitest';
+import type { OfferingSlug } from '../src/responses/types';
+import {
+  PRICING_TABLE,
+  NETWORK_MULTIPLIER,
+  computeClassFor,
+  networkMultiplierFor,
+  canonicalUsdFor,
+  resolvePriceUsd,
+} from '../src/pricing';
+
+const ALL_SLUGS: OfferingSlug[] = [
+  'legitimacy_scan',
+  'verify_whitepaper',
+  'verify_full_tech',
+  'claim_extraction',
+  'claim_history',
+  'quick_protocol_facts',
+  'daily_tech_brief',
+  'daily_greenlight_list',
+  'scam_alert_feed',
+];
+
+const LIVE_ALLOWED: OfferingSlug[] = [
+  'legitimacy_scan',
+  'verify_whitepaper',
+  'verify_full_tech',
+  'claim_extraction',
+];
+
+const CACHE_ONLY: OfferingSlug[] = [
+  'claim_history',
+  'quick_protocol_facts',
+  'daily_tech_brief',
+  'daily_greenlight_list',
+  'scam_alert_feed',
+];
+
+const UNPRICED: OfferingSlug[] = ['daily_greenlight_list', 'scam_alert_feed'];
+
+describe('pricing — computeClass + canonical table (E1-A, Invariant #30/#31)', () => {
+  it('classifies all 9 offerings, matching cacheOrLive reachability', () => {
+    expect(Object.keys(PRICING_TABLE).sort()).toEqual([...ALL_SLUGS].sort());
+    for (const slug of LIVE_ALLOWED) expect(computeClassFor(slug)).toBe('LIVE_ALLOWED');
+    for (const slug of CACHE_ONLY) expect(computeClassFor(slug)).toBe('CACHE_ONLY');
+  });
+
+  it('no offering is LIVE_PRIORITY yet (no premium-queue variant exists)', () => {
+    for (const slug of ALL_SLUGS) expect(computeClassFor(slug)).not.toBe('LIVE_PRIORITY');
+  });
+
+  it('canonicalizes the 7 existing prices as-is (no repricing on this phase)', () => {
+    const expected: Record<string, number> = {
+      legitimacy_scan: 0.25,
+      verify_whitepaper: 1.5,
+      verify_full_tech: 3.0,
+      claim_extraction: 0.75,
+      claim_history: 0.25,
+      quick_protocol_facts: 0.3,
+      daily_tech_brief: 8.0,
+    };
+    for (const [slug, usd] of Object.entries(expected)) {
+      expect(canonicalUsdFor(slug as OfferingSlug)).toBe(usd);
+    }
+  });
+
+  it('leaves the 2 unpriced offerings flagged (null), not invented', () => {
+    for (const slug of UNPRICED) {
+      expect(PRICING_TABLE[slug].canonicalUsd).toBeNull();
+      expect(() => canonicalUsdFor(slug)).toThrow(/no canonical price/);
+    }
+  });
+
+  it('networkMultiplier resolves to 1.00 for both live channels today (Invariant #31)', () => {
+    expect(NETWORK_MULTIPLIER.x402).toBe(1.0);
+    expect(NETWORK_MULTIPLIER.acp).toBe(1.0);
+    expect(networkMultiplierFor('x402')).toBe(1.0);
+    expect(networkMultiplierFor('acp')).toBe(1.0);
+  });
+
+  it('resolvePriceUsd = canonicalUsd × networkMultiplier (identity at 1.00×)', () => {
+    expect(resolvePriceUsd('legitimacy_scan', 'x402')).toBe(0.25);
+    expect(resolvePriceUsd('legitimacy_scan', 'acp')).toBe(0.25);
+    expect(resolvePriceUsd('daily_tech_brief', 'x402')).toBe(8.0);
+  });
+
+  it('resolvePriceUsd fails closed for an unpriced offering', () => {
+    expect(() => resolvePriceUsd('scam_alert_feed', 'x402')).toThrow(/no canonical price/);
+  });
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d23d8ca..e918de7 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -56,6 +56,9 @@ importers:
       '@grey/pipeline':
         specifier: workspace:*
         version: link:../../packages/grey-pipeline
+      '@grey/schemas':
+        specifier: workspace:*
+        version: link:../../packages/grey-schemas
       '@grey/x402-middleware':
         specifier: workspace:*
         version: link:../x402-middleware
@@ -78,6 +81,9 @@ importers:
 
   adapters/x402-middleware:
     dependencies:
+      '@grey/schemas':
+        specifier: workspace:*
+        version: link:../../packages/grey-schemas
       fastify:
         specifier: ^5.8.5
         version: 5.8.5
diff --git a/vitest.config.ts b/vitest.config.ts
index 1d4c987..ad8ceec 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -30,6 +30,7 @@ export default defineConfig({
       { find: /^@grey\/schemas\/requests$/, replacement: src('./packages/grey-schemas/src/requests/index.ts') },
       { find: /^@grey\/schemas\/envelope$/, replacement: src('./packages/grey-schemas/src/envelope/index.ts') },
       { find: /^@grey\/schemas\/validators$/, replacement: src('./packages/grey-schemas/src/validators/index.ts') },
+      { find: /^@grey\/schemas\/pricing$/, replacement: src('./packages/grey-schemas/src/pricing/index.ts') },
       { find: /^@grey\/pipeline$/, replacement: src('./packages/grey-pipeline/src/index.ts') },
       { find: /^@grey\/x402-middleware$/, replacement: src('./adapters/x402-middleware/src/index.ts') },
     ],