SameDayDesk x402 and MPP Data Gateway

Thirteen pay-per-call tools for deterministic agent-work opportunity preflight, machine-service discoverability, Morpho borrower and market decisions, protection plans, URL extraction, Markdown reading, repository security scans, company and wallet enrichment, structured data generation, and AI-search readiness audits.

• Product page: https://samedaydesk.com/x402
• Smithery: https://smithery.ai/servers/epistemedeus/x402-data-gateway
• Remote MCP: https://agents.samedaydesk.com/mcp
• Live resource manifest: https://agents.samedaydesk.com/.well-known/x402
• OpenAPI: https://agents.samedaydesk.com/openapi.json
• Official MPP OpenAPI: https://agents.samedaydesk.com/mpp-openapi.json
• Skill contract: https://agents.samedaydesk.com/skill.md
• Action catalog: https://agents.samedaydesk.com/api/actions
• A2A agent card: https://agents.samedaydesk.com/.well-known/agent-card.json
• Global A2A Registry: https://www.a2a-registry.org/agent/9cb0b8e6-cb1f-422b-a604-861d0a79e24b
• Settlement Radar: https://agents.samedaydesk.com/platforms
• Platform health JSON: https://agents.samedaydesk.com/v0/cards.json
• Aggregate machine-demand telemetry: https://agents.samedaydesk.com/v0/commerce-demand.json
• Morpho position risk: GET /defi/morpho-position?address=0x...&shocks=-10,-20,-30
• Morpho protection quote: GET /defi/morpho-protection?address=0x...&targetHealthFactor=1.25&protectAgainstShockPct=-10
• Morpho market underwriting: GET /defi/morpho-market-underwrite?marketId=0x...
• Morpho PreLiquidation replay: GET /defi/morpho-preliquidation-replay?transactionHash=0x...
• Opportunity preflight: GET /work/opportunity-preflight?rewardUsd=10&hours=0.25&hourlyCostUsd=4&selectionProbabilityPct=20
• Agent discoverability audit: GET /distribution/agent-discoverability-audit?origin=https://example.com&intent=extract+a+public+website+into+structured+JSON&route=/extract
• Material-change alert probe: https://agents.samedaydesk.com/alerts
• Agoragentic seller callback: POST /integrations/agoragentic/ai-readiness-audit
• the402 signed fulfillment webhook: POST /integrations/the402/webhook

No API key or subscription is required. Every paid HTTP route advertises x402 and native MPP Payment authentication in the same 402 response. Both protocols settle the same exact USDC amount to the same Base mainnet merchant wallet. MCP tool calls remain x402-gated.

The Morpho route is read-only. It calculates LTV, LLTV, health factor, liquidation headroom, and collateral-price shock scenarios from integer protocol values, then cross-checks indexed collateral, borrow shares, and oracle price against direct Base RPC state. Scenarios are calculations rather than probabilities or transaction recommendations. The separate protection route uses a fresh direct-RPC oracle read and direct confirmation of collateral and borrow shares to calculate exact partial-repay and add-collateral amounts. It returns unsigned token-approval and Morpho-call templates, explicit execution buffers, revalidation requirements, and economic postconditions. It never accesses a wallet, signs, broadcasts, or takes custody.

The service also keeps a privacy-safe demand telescope on a persistent Railway volume. It records route families, query key names, challenge/success classes, and pseudonymous repeat-use signals. External fetches are acquisition signals, not verified buyers, because unidentified automated indexers can remain. Recognized crawler and agent-indexer user agents are reduced at ingestion to a controlled source label and reported in a separate machine-discovery lens with source and route coverage. Those observations measure fetches, not authenticated catalog referrals, intent, or demand. Unmatched requests are reported separately from a conservative semantic-candidate subset; neither becomes demand until an independent caller repeats or converts. It does not record raw IP addresses, user agents, URLs, query values, bodies, payment headers, marketplace payloads, or credentials. Public output is aggregate only; owner traffic is excluded and crawler traffic remains excluded from demand even when its controlled discovery counts are reported separately. Common exploit probes such as .env, .git, and WordPress discovery paths are classified as scanner traffic and excluded as well.

Version 1.9.4 adds explicit paid-traffic classes without exposing buyer addresses. COMMERCE_PAYER_CLASSES accepts a JSON array of { "address", "class" } records. Controlled classes are internal, validation, incentivized, affiliated, and independent. Addresses are converted to the same secret-keyed payer pseudonyms already used by telemetry and classified at read time, which also permits retroactive correction without storing a raw address. Unknown payers remain unclassified; unfamiliar wallets never become independent demand by inference. The public snapshot reports paid success by class plus independent and repeat-independent actor counts.

Version 1.9.5 adds route-level paid-success counts inside each evidence class. This lets downstream monitors treat marketplace validation as accounting and transport evidence, alert on unclassified paid use for investigation, and advance the demand thesis only for explicitly independent or repeat-independent buyers.

Version 1.9.6 privately captures a valid Base transaction hash from successful x402 PAYMENT-RESPONSE or MPP Payment-Receipt headers after an explicit evidence baseline. Public telemetry exposes only proof coverage, distinct-count, and missing-reference counts by payment class. Raw headers and transaction references stay on the private volume. A missing reference becomes a material settlement-integrity event without exposing the reference itself.

Version 1.11.2 content-negotiates the root without changing its machine contract. Browser navigation with an explicit Accept: text/html receives a responsive human map of the thirteen tools, payment flow, and authoritative discovery links. JSON clients, curl's wildcard accept header, and agents keep the stable JSON descriptor. The response varies on Accept, and the human page duplicates no payment schema.

Version 1.11.2 also adds the source-attributed machine-discovery lens. It keeps raw user agents and network addresses out of the public snapshot, reports exact future indexer observations by controlled source and route, and gives the radar only first-source and first-route coverage changes as material events. Repeated crawl volume remains visible data without becoming an attention alert or demand.

Version 1.11.3 makes that reach lens prospective and self-excluding. A distinct COMMERCE_AGENT_DISCOVERY_SINCE baseline prevents pre-instrumentation crawler history from becoming attributed reach, while SameDayDesk-owned monitor user agents are excluded from both discovery and external-demand observations. This keeps integrity sweeps, brand-blind benchmarks, and radar probes from creating their own acquisition signal.

Version 1.11.4 preserves paying agents even when their user agent identifies as a crawler or indexer. A valid submitted x402 or MPP credential moves the event into economic telemetry before crawler classification, while the controlled user-agent label records source-to-paid conversion by source and route. Channel labels are still self-declared rather than authenticated referral proof, and independent demand still requires the explicit payer-class policy.

Version 1.11.5 separates paid-route reach from challenge delivery. Prospective agent/indexer observations now report paid-route probes, HTTP 402 challenges, distinct and repeat challenge actors, challenge rate, and controlled source and route breakdowns. This identifies whether the machine funnel stops before the paywall, at the challenge, or after a submitted credential without treating an indexer probe as purchase intent.

Version 1.11.6 adds a conservative challenge-to-payment cohort. A paid success counts as continuation only when the same secret-keyed network-and-user-agent actor returns after its first prospective challenge. The public snapshot reports converted calls, converted actors, independent converted actors, conversion rate, and controlled source and evidence-class totals without actor IDs. Network or user-agent drift can only create false negatives, so the metric is a lower bound rather than an identity claim.

Version 1.11.7 adds project-owned Glama connector verification at /.well-known/glama.json using the public SameDayDesk business email. Glama requests have their own controlled discovery-source label, so a propagated directory claim can be measured without becoming demand.

Version 1.11.8 starts a separate credential-attempt funnel. After a declared baseline, a parseable attempt must include a syntactically complete x402 v2 exact binding or MPP evm/charge credential. Signature validity and settlement remain later outcomes. Public aggregates separate header noise from parseable attempts and report protocol, result, route, controlled source, and explicit payer class without raw credentials, actor IDs, or addresses.

Version 1.11.9 improves MCP tool selection without renaming or duplicating any tool. Every tool now has a unique action-oriented title. The overlapping web and company tools explicitly say when to choose extract versus read, enrich versus schemaforge, and the combined deep_audit; wallet_enrich also states that its input is an EVM address rather than a company domain. The payment routes, names, prices, schemas, and handlers are unchanged.

Version 1.11.10 adds explicit descriptions to every opportunity_preflight input and to the three Morpho protection controls. This improves machine call construction while leaving names, routes, prices, required inputs, defaults, payment gates, and execution behavior unchanged.

Version 1.11.11 gives all four Morpho MCP tools explicit sibling-selection guidance. Borrower diagnosis, future protection planning, market underwriting, and historical PreLiquidation replay are now distinct machine choices without renaming a tool or changing its route, price, schema, payment gate, or handler.

Version 1.11.12 starts a prospective MCP transport-friction probe. It separates four common client expectations, /mcp/sse, /mcp/messages, /mcp/tools, and /mcp/events, from arbitrary /mcp/* misses without serving a guessed alias. Public aggregates expose only route counts and secret-keyed actor totals. A compatibility route is justified only by repeated independent use or conversion.

Version 1.11.13 repairs the pre-payment response contract exposed to machine buyers. All thirteen routes already authored explicit JSON output schemas, but the Bazaar v2 helper expects that schema under output.schema; the previous top-level outputSchema field was silently ignored. A single tested adapter now places each authored schema at the protocol-defined location, so an unpaid 402 challenge exposes both the example and the concrete required response fields before an agent authorizes payment. Routes, inputs, prices, settlement, and handlers are unchanged.

Version 1.11.14 projects the same thirteen response contracts into the free OpenAPI and action catalog. Discovery agents can now inspect concrete required fields and an example before probing a paid route; /read is also described as the JSON object its handler actually returns rather than a raw Markdown string. One route-keyed contract map drives the x402 challenge, OpenAPI, and action catalog to prevent the three machine surfaces from drifting apart.

Version 1.11.16 links the versioned, credential-free agent-payment-policy reference from the machine root, OpenAPI service metadata, and llms.txt. The reference has no wallet executor, payment signer, custody, or hosted paid verifier. It gives machine buyers a stable policy and evidence primitive without changing the merchant's routes, prices, payment requirements, or settlement.

Version 1.11.15 validates every Bazaar declaration against its own JSON Schema before startup. Six newer routes previously settled successfully while Coinbase rejected their discovery metadata because their output examples omitted fields marked required by the same schemas. The examples now conform, and bazaar-contract-audit.mjs checks every live paid route through credential-free HTTP 402 probes without retaining headers or query values.

Version 1.11.18 adds a source-quality funnel to the public aggregate. Each controlled discovery source now reports observations alongside distinct and repeat actors at discovery, paid-route, challenge, credential-attempt, and paid success stages. Challenge rates are available both per request and per actor, so one high-frequency crawler no longer looks like broad machine reach. Challenge-to-payment conversions are attributed to the source of the first observed challenge. Raw user agents, network addresses, and actor identifiers remain private and are not returned.

Version 1.11.19 starts a separate prospective AI-provider source cohort. It uses exact provider-published HTTP tokens to distinguish OpenAI, Anthropic, and Perplexity search, user-fetch, and training traffic plus Google Cloud Vertex agent crawls. Google-Extended is intentionally excluded because Google states that it has no distinct HTTP user-agent string. The detail cohort has its own baseline, preserves historical generic records, reports the same actor funnel, and treats every label as an unauthenticated observation rather than referral proof.

Version 1.11.20 repairs the resource metadata consumed by payment-capable wallet agents. Every one of the thirteen x402 v2 challenges now carries the validated provider-level serviceName and five bounded route capability tags in the standard top-level resource object. Startup fails closed if paid-route coverage and metadata coverage diverge. The Bazaar contract audit now rejects a route whose extension is valid but whose resource name or tags are absent or invalid. Prices, outputs, settlement, privacy, routes, and native MPP terms are unchanged.

Version 1.9.7 privately reconciles each post-baseline reference against its canonical Base receipt. A record is accepted only when the transaction succeeded, exactly one canonical Base USDC transfer reached the configured treasury, the atomic amount matches the paid response, and the transfer sender matches the request payer pseudonym when available. Duplicate references and all mismatches fail closed. The private mode-0600 ledger retains the reference; public health and demand output expose only aggregate settlement counts, atomic amounts by evidence class and route, issue counts, and a generic error state.

Version 1.9 adds same-route MPP evm/charge support to all twelve paid HTTP capabilities without replacing the existing x402 middleware. An unpaid request now carries both WWW-Authenticate: Payment and PAYMENT-REQUIRED. Native MPP credentials use Authorization: Payment and successful calls return Payment-Receipt; x402 keeps its Bazaar, payment-identifier, signed offer/receipt, and PAYMENT-RESPONSE extensions. MPP challenges are bound to the canonical method, path, and sorted query. Both protocols participate in privacy-safe telemetry and request replay, and OpenAPI 3.1 exposes valid per-operation x-payment-info offers.

Version 1.9.3 generates two registry-specific discovery views from the same route and price source. /openapi.json carries the structured USD price, protocol declarations, agent guidance, public-route auth declarations, and truthful response schemas used by AgentCash and MPPScan. /mpp-openapi.json carries official MPP offers[] without incompatible flat fields. Stable operation IDs and capability tags make the public catalog easier for agents to search, rank, and invoke. Runtime 402 challenges remain authoritative for both views.

Version 1.8 adds a deterministic paid opportunity preflight. The caller supplies reward, execution time, hourly opportunity cost, compute, mandatory spend, reusable value, competition, and an explicit selection probability. The result returns attempt, verify_first, or abandon, transparent break-even economics, hard access and funding gates, and an optional dated Settlement Radar card. It does not scrape a restricted board or touch a source-platform account, claim, bid, payment, or submission. Version 1.7 added request-bound idempotent replay for HTTP buyers that supply the x402 payment-identifier extension. A successful JSON response is cached for 15 minutes on the private Railway volume. The cache key is an HMAC of the logical payment ID, and the binding covers the full canonical URL, HTTP method, payer, network, asset, amount, and recipient. Raw payment IDs, payer addresses, and request URLs are not stored. An exact retry receives the original response and signed settlement receipt without a second payment; changed input, payer, or payment terms return an uncharged HTTP 409. Replays are counted separately from new paid-success events.

Observed agent crawlers use several discovery conventions. The canonical manifest remains /.well-known/x402, with compatible aliases at /.well-known/x402.json, /x402.json, and /api/x402. The AgentCash-compatible OpenAPI document remains /openapi.json, with /openapi.yaml and /swagger.json returning the same JSON document. Official MPP discovery uses /mpp-openapi.json, with /openapi.mpp.json as an alias. GET /mcp returns a free transport descriptor; actual MCP discovery and paid tool calls use streamable HTTP at POST /mcp. Agents that prefer a compact instruction contract can read /skill.md (or /SKILL.md), while /api/actions returns the thirteen canonical GET actions with their URL, description, exact atomic USDC price, MIME type, network, and payTo. Agent Skills clients may send X-SameDayDesk-Agent-Source: agent-skills-v1 on the initial request and paid replay. Telemetry reduces that exact allowlisted value to the public-safe agent-skills label and never stores the raw header. This is declared, spoofable attribution rather than authentication, and it cannot change price, payment, or access. The A2A v1.0 card at /.well-known/agent-card.json advertises one bounded free skill, discover-x402-paid-actions. POST /a2a/message:send returns that exact catalog as an A2A direct message, giving A2A clients a standards-based path from agent discovery to the existing paid x402 actions without claiming arbitrary task execution.

The repository-root agent-card.json is a compatibility manifest for the Global A2A Registry's current GitHub importer. It points back to the canonical v1.0 Agent Card and OpenAPI document; it does not replace the production card. The registry's own generated ownership manifest is hosted separately at https://samedaydesk.com/.well-known/agent-card.json; the standards-compliant A2A v1.0 card remains canonical on agents.samedaydesk.com.

PreLiquidation shadow watcher

morpho-preliquidation-shadow.mjs is the observation-only forward evidence lane selected by the complete Base census. It watches the five markets that concentrate historical execution, derives each market's actual PreLiquidation health threshold from LLTV and pre-LLTV, checks every observed authorization directly at one explicit Base block, and uses per-contract event cursors.

New execution transactions are replayed through the deterministic archive-RPC engine, up to 20 per run. The record includes detection latency, gross loan-asset incentive, and native gas while retaining the explicit boundary that swap, funding, failure, competition, and MEV costs remain outside the replay. Positions below the explicit 1 USD debt observation floor are classified as dust rather than opportunities.

node morpho-preliquidation-shadow.mjs \
  --state /data/morpho-preliquidation-shadow-state.json \
  --history /data/morpho-preliquidation-shadow-history.ndjson

State and history files are forced to mode 0600. A material change means a new or removed authorization, a transition into or out of the protocol-specific risk window, a large liquidity or utilization move, or a new verified PreLiquidation execution. No wallet, signer, authorization, custody, or principal is part of the watcher.

The Agoragentic callback is a separate marketplace distribution bridge. The marketplace handles buyer routing, settlement, and seller accounting, while the callback performs the same production AI-search-readiness audit behind a small per-IP safety cap. Direct agent customers continue to use the paid x402 route.

The the402 bridge is a second marketplace distribution path. It authenticates signed job dispatches with timestamped HMAC verification, accepts callbacks only on the official API origin, and submits a structured audit deliverable for automatic settlement. THE402_API_KEY, THE402_WEBHOOK_SECRET, and THE402_SERVICE_ID are Railway-only environment variables.

The same service also hosts two free, disclosed affiliate handoffs used by fact-checked SameDayDesk guides: /go/topify and /go/manychat. They mint and cache Agent Hansa's expiring signed links server-side, validate the redirect host, expose no API key, and return noindex, nofollow plus no-store.

Original rail implementation

A Node/Express server that returns HTTP 402 Payment Required when unpaid and serves the resource after payment, settling USDC on Base mainnet straight to our own wallet:

payTo = 0x8904dF3DE6DFEe6a7C8cc38619d2f17806213Cee

Verified live (June through August 2026). The server boots and returns correct 402 responses with machine-readable payment requirements. The Morpho canary is amount=20000 = 0.02 USDC, network=eip155:8453, and asset=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 = Base USDC, payTo equal to our wallet, plus a Bazaar discovery extension with input and output schemas.

---

Current production decision

Path	Account/API key?	Base mainnet?	Discovery reach
CDP facilitator (api.cdp.coinbase.com/platform/v2/x402)	Yes, Coinbase CDP account plus CDP_API_KEY_ID and CDP_API_KEY_SECRET	Yes	Production default. CDP Bazaar catalog, merchant lookup, and semantic search after first settlement
xpay public facilitator (facilitator.xpay.sh)	None	Yes (eip155:8453, exact scheme)	Fallback settlement path with self-published discovery only
x402.org public facilitator (x402.org/facilitator)	None	No, Base Sepolia testnet only	Separate test catalog at x402.org/facilitator/discovery/resources

Production uses CDP. The first eleven routes passed live CDP verification and completed a real settlement. The original eight appear in Bazaar merchant discovery. The three newer Morpho decision routes have successful settlement receipts, and a distinct funded payer produced isValid: true plus Bazaar extension status processing for all three. They still did not enter merchant discovery after the documented cache window and a fresh settlement, so this is tracked as a downstream CDP indexing incident rather than a route-metadata failure. The secret-free reproduction is attached to x402 issue #2156. Keep xpay as the no-key continuity fallback, not as the normal production facilitator.

The twelfth route, /work/opportunity-preflight, is live at 0.05 USDC and completed an owner-excluded settlement for integration and indexing QA. The thirteenth route, /distribution/agent-discoverability-audit, is live at 0.05 USDC and productizes the brand-blind catalog benchmark used on SameDayDesk itself. It queries Bazaar, Agent402, Circle, and the official MPP catalog without catalog credentials or payments, preserves registry-native order, and reports coverage, rank, competitors above the target, and evidence-based next actions as point-in-time observations rather than a composite score.

---

How the rail works (why "no account" is safe)

The exact scheme settles USDC via an EIP-3009 transferWithAuthorization: the buyer (agent) signs an authorization that moves USDC directly from their wallet to our payTo on-chain. The facilitator only verifies the signature and broadcasts the transaction; it never holds the money. So:

• Whatever facilitator we pick, the USDC lands in our payTo wallet.
• We hold the key to payTo; the facilitator does not.
• CDP and xpay are non-custodial facilitator paths. CDP relayed the eight live seller canaries and the exact USDC amounts reached our wallet.

This is the same rail Frantic used to pay real mainnet USDC to this wallet, so we already know settlement to 0x8904…3Cee works.

---

Answers to the five questions

1. Facilitator + autonomy

• The public x402.org facilitator supports Base Sepolia testnet only (eip155:84532); its /supported endpoint does not list eip155:8453. Mainnet via x402.org is impossible.
• Base mainnet settlement does not strictly require a Coinbase CDP account. The xpay public facilitator (https://facilitator.xpay.sh) supports Base mainnet eip155:8453 exact scheme with no account and no API key (verified against its live /supported endpoint). This is the fully-autonomous mainnet path.
• The CDP facilitator requires a CDP account and API keys. Its advantage is Bazaar merchant discovery, semantic search, and the Bazaar MCP buyer surface.
• Production chose CDP after a live verify-only matrix and eight successful settlements. xpay remains the no-key fallback.

2. Exact seller code

See server.js. Current package line (NOT the legacy flat [email protected]):

@x402/express     2.16.0   paymentMiddleware, x402ResourceServer
@x402/core        2.16.0   HTTPFacilitatorClient   (import from @x402/core/server)
@x402/evm         2.16.0   ExactEvmScheme          (import from @x402/evm/exact/server)
@x402/extensions  2.16.0   declareDiscoveryExtension (import from @x402/extensions/bazaar)
@coinbase/x402    2.1.0    createFacilitatorConfig (only needed for CDP mainnet)
mppx              0.8.15   native MPP EVM charge challenge, credential, and receipt support

Core wiring:

const facilitatorClient = new HTTPFacilitatorClient(
  createFacilitatorConfig(process.env.CDP_API_KEY_ID, process.env.CDP_API_KEY_SECRET)
);
const resourceServer = new x402ResourceServer(facilitatorClient)
  .register("eip155:8453", new ExactEvmScheme());

app.use(paymentMiddleware(
  { "GET /premium": { accepts: [{ scheme: "exact", price: "$0.01",
      network: "eip155:8453", payTo: "0x8904dF3DE6DFEe6a7C8cc38619d2f17806213Cee" }],
      description: "...", mimeType: "application/json", extensions: { ... } } },
  resourceServer
));

3. Bazaar discovery

The route's extensions uses declareDiscoveryExtension({ input, inputSchema, output, outputSchema }) (already in server.js). This advertises the route and its JSON schemas in the 402 payload (verified present in the live response). Surfacing in the CDP Bazaar requires the CDP facilitator: CDP catalogs a route after its first successful settlement. The production merchant lookup returns the original eight SameDayDesk routes; all three newer Morpho decision routes have successful CDP settlements and accepted processing Bazaar extensions, but remain absent beyond the documented cache window. CDP also finds the original Morpho and deep-audit routes through semantic search. Use the merchant lookup as evidence of CDP catalog state, not as the canonical count of SameDayDesk capabilities; the owned manifest, MCP, A2A, and OpenAPI surfaces remain complete at thirteen.

CDP rejected three older route payloads whose discovery descriptions were 535, 581, and 629 characters even though local extension validation passed. Concise rewrites of 294, 258, and 301 characters passed. Keep new discovery descriptions under 400 characters and run live CDP verify before a funded canary.

4. Settlement verification

After a paid call, confirm USDC landed at payTo on Base mainnet. The 402/200 flow also returns a PAYMENT-RESPONSE header with settlement data. Independently:

# USDC balanceOf(payTo) on Base mainnet via public RPC, no key:
curl -s -X POST https://mainnet.base.org -H 'Content-Type: application/json' \
  --data '{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{
    "to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "data":"0x70a082310000000000000000000000008904df3de6dfee6a7c8cc38619d2f17806213cee"
  },"latest"]}'

Result is hex atomic USDC (divide by 1e6). Or use our existing Base-mainnet balance checker. Or view the wallet on https://basescan.org/address/0x8904dF3DE6DFEe6a7C8cc38619d2f17806213Cee

5. Cleanest recommended path

Deploy on CDP for the production storefront. It preserves direct USDC settlement and adds the catalog, semantic search, merchant lookup, and Bazaar MCP buyer surface. Keep xpay configured as the no-key recovery path.

---

Deploy steps (Railway)

The repo is a no-config Node app: npm start runs node server.js and binds process.env.PORT (Railway sets it).

1. Deploy this directory directly or push the repository source.
2. Set env vars on the Railway service:

   PAY_TO=0x8904dF3DE6DFEe6a7C8cc38619d2f17806213Cee
   NETWORK=eip155:8453
   PRICE=$0.05
   FACILITATOR=cdp
   CDP_API_KEY_ID=<CDP API key ID>
   CDP_API_KEY_SECRET=<CDP API key secret>
   MPP_SECRET_KEY=<random secret of at least 32 bytes>
   COMMERCE_DATA_DIR=/data
   COMMERCE_ACTOR_SECRET=<random 32-byte secret>
   COMMERCE_INTERNAL_TOKEN=<random owner-canary token>
   COMMERCE_EXTERNAL_SINCE=<ISO timestamp after controlled launch canaries>
   COMMERCE_AGENT_SOURCE_DETAIL_SINCE=<ISO timestamp after provider taxonomy release>
   COMMERCE_SETTLEMENT_EVIDENCE_SINCE=<ISO timestamp after settlement-proof release>
   COMMERCE_PAYER_CLASSES='[{"address":"0x...","class":"validation"}]'
   

   Core payment settings have safe defaults. Production telemetry uses a Railway volume mounted at /data plus the two secret variables above.
3. Generate a public domain for the service.
4. Verify:

   curl https://<your-domain>/healthz          # -> {ok:true, network:eip155:8453, ...}
   curl -i 'https://<your-domain>/defi/morpho-position?address=0x...' # -> HTTP 402 + WWW-Authenticate and PAYMENT-REQUIRED
   

5. Complete one bounded settlement per discoverable route, then confirm the merchant lookup and semantic search. Record owner settlements as test flow, not revenue.

Fall back to xpay without changing route code

If CDP is unavailable and continuity matters more than central discovery, set:

FACILITATOR=xpay

Redeploy. Base mainnet settlement continues, but new calls no longer feed the CDP Bazaar quality and activity signals.

Prove the rail on testnet first (optional)

FACILITATOR=testnet
NETWORK=eip155:84532

Uses x402.org + Base Sepolia (fake USDC) to validate the full 402→pay→200 loop before taking mainnet money.

---

Local run

npm install
npm start
# then:
curl -i 'http://localhost:3000/defi/morpho-position?address=0x...' # HTTP 402

Files

• server.js — the server (env-driven facilitator/network/price).
• commerce-events.mjs — privacy-safe durable demand telemetry.
• mpp-dual-stack.mjs — same-route native MPP authorization and receipt adapter.
• morpho-position.mjs — deterministic Morpho snapshot, stress, and RPC checks.
• morpho-protection.mjs — exact stressed repair amounts and unsigned action templates.
• morpho-market-underwrite.mjs — multi-source market integrity, liquidity, concentration, borrower-health, history, bad-debt, and PreLiquidation evidence.
• morpho-preliquidation-replay.mjs — historical PreLiquidate event economics from direct block-state reads.
• morpho-preliquidation-census.mjs — repeatable Base supply, authorization, and execution census for internal market selection.
• package.json — exact pinned deps (verified to install & boot).
• README.md — this guide.
• extract.mjs — pre-existing zero-dependency "URL → clean structured data" service. This is a natural paid resource to put behind /premium: in the route handler, call its extractor on a ?url= query param and return the structured result instead of the placeholder {value:42}. Add ?url to the Bazaar inputSchema when you wire it up.

Sources (primary, verified August 2026)

• x402 seller quickstart: https://docs.x402.org/getting-started/quickstart-for-sellers
• CDP x402 docs: https://docs.cdp.coinbase.com/x402/welcome
• CDP network support (x402.org = testnet only; CDP = mainnet + keys): https://docs.cdp.coinbase.com/x402/network-support
• CDP Bazaar: https://docs.cdp.coinbase.com/x402/bazaar
• x402 monorepo: https://github.com/coinbase/x402
• npm: @x402/express, @x402/core, @x402/evm, @x402/extensions, @coinbase/x402
• xpay public facilitator live /supported (Base mainnet, no key): https://facilitator.xpay.sh/supported