x402-protocol-integration

Returns demand depth for one category: probe volume, distinct sources, buyer-class share, probed price points, and a daily time series. Use it to validate pricing before launching in that category.

Cryptographic verification of the offer-receipt extension of x402. Accepts a signed offer in eip712, jws or eip191 form — either bundled as {format, payload, signature} or as payload plus a separate signature — and an optional signed receipt. Recovers the signer, compares it with the payTo of the offer, compares receipt and offer field by field and names every divergence with the value on each side, checks whether the offer has expired and whether the receipt timestamps are plausible against sta

A stateful duplicate check for agents that settle x402 payments. Supply any of payment_id, payload_hash and nonce; each is hashed with SHA-256 before storage, so the service keeps fingerprints and timestamps and never the values themselves, never a payload, never an address. The answer states for every supplied identifier whether it was seen before, when it was first and last seen, how often, and whether the first sighting falls inside window_seconds. The recommendation is ablehnen only for a re

Fetches the 402 challenge of a foreign endpoint without paying anything — no payment header, no signature, no settlement — or parses a challenge you already hold. Returns x402_version, every accepts entry with scheme, network, resolved network name and chain id, asset, symbol, decimals and the amount both in raw units and in human form, plus the resource block and any expiry. amount_human is computed with the decimals of that token, resolved from a known-asset table or read from the chain; where decimals cannot be established it stays null and is listed in unavailable_fields rather than assuming six. parse_warnings names concrete gaps such as a missing description or missing inputSchema, a non-CAIP-2 network, a bridged instead of canonical asset, or an amount sent as a JSON number. It does not judge the service, does not pay, does not verify signatures and does not check whether the seller delivers. Answers for a URL are cached for 60 seconds; age_ms states the age of the fetched challenge.

A stateless rule check for agents that pay for x402 endpoints. You supply the proposed payment, your policy and the amounts already spent this hour and this day; this endpoint keeps no ledger of its own and returns your counters unchanged. Every configured rule — max_per_call, max_per_hour, max_per_day, allowed_chains, allowed_assets, allowed_recipients, blocked_recipients, require_schema — is reported individually as erfuellt, verletzt, nicht_pruefbar or nicht_gesetzt, together with the limit a

Validates a 402 challenge — fetched from a URL without paying, or supplied directly — against PaymentRequiredV1Schema and PaymentRequiredV2Schema of the installed @x402/core reference implementation. Reports the detected version and how it was detected, every error with field, expected, found and spec_ref naming package, version, schema and field path, whether the network is valid CAIP-2, whether the asset is a known and canonical token address or a bridged variant, whether the declared inputSch

Everything about a domain in one call: registrar, creation and expiry dates and age from the registry's own RDAP, live DNS (A/AAAA/MX/NS), email authentication (SPF, DMARC policy) and the TLS certificate it serves (issuer, validity, days left, whether it covers the name). Pay-per-call via x402. An empty body is answered for the published example domain (example.com); send {"domain":"…"} for any other domain.

Canary ping and health verification endpoint for x402 networks and buyers. Returns gateway health, supported model list, and MCP endpoint address. Use before integrating to confirm the service is online. Fixed $0.002 USDC per call on Base.

Searches the public x402 discovery catalogue for services able to replace a broken dependency. Give the failed URL and, better still, a short description of what it did and the fields you need back; matches are scored on overlap between your task words and the candidate name, description and path, then ordered by score and price. Every hit carries the reason it matched, its price in USDC, its network and when the catalogue last saw it.

Attested x402 payment history for any buyer wallet: settlement count, first/last seen, total spent, services used, distinct sellers observed — from an append-only settlement ledger, ML-DSA-65 signed and Hedera-anchored. Evidence, not opinion: these records cannot be revised.

Sanctions check on who you are about to pay: give the x402 endpoint URL, we read its own 402 quote, pull every payTo (all networks) and screen each against OFAC, UN, EU and UK lists. Signed per-payee and overall verdict: deny on an OFAC match, review on a UN/EU/UK match or an unavailable list, clean otherwise. $0.01 in USDC on Base or Solana. A bad or non-x402 URL returns 400 with charged:false; you are never charged for an error. Free preview: GET /screen-url/preview

The x402 market by seller over the last 30 days: estimated revenue, paid calls, paying wallets, calls per payer, median price, networks and each seller's top resource - from Coinbase's public x402 discovery index, read hourly. Rank by revenue, calls or payers; filter by keyword and network; a payer floor (default 3) drops lone testers. Send {} for the top 20 by revenue. Pay-per-call via x402.

Raw observation history for any publicly listed x402 endpoint: discovery snapshots (listed/delisted/relisted, price changes, payTo changes) and probe time-series (uptime, latency, quoted amount) over the requested window (1-90 days).

Track one agent service over time - the full day-by-day history of any x402 listing or MCP server: price changes, paying customers, call volume, installs, first and last seen. See what a listing like yours earns, watch a competitor grow or die. From daily whole-market snapshots the live catalogs don't keep. ?id=<x402 resource URL or MCP registry name> (find ids via /find, free). Market overview: /market/pulse $0.005.

Reference catalog of trade/quote condition codes (the numeric `conditions` seen on trades) with names, types, data types, and SIP mappings. From x402stock, a pay-per-call market & economic data API for AI agents. No API key or account; pay in USDC via x402.

Reads the public x402 Bazaar catalogue and finds offers comparable to yours, either from a resource_url whose 402 challenge is fetched without paying, or from a category and description you supply. Every comparable offer is listed with its price, its provider host, a similarity score and the terms both sides share, so comparability is justified rather than asserted; the formula, its weights and the inclusion threshold are stated in the answer. Prices are aggregated as median, p25 and p75 over co

Live x402 conformance pre-flight check: pass ?url=<x402 endpoint>, get a structured PASS/WARN/FAIL verdict on its 402 challenge before you trust it with a real payment.

Demo X402 premium endpoint (mainnet) - pay $0.01 USDC

GPT-5.6 Luna Standard chat is $0.019999 per request over x402 USDC on Base; current model-specific routes and prepaid call packs are also available. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call; this gateway publishes GPT-5.6 Luna Standard at $0.019999 and model-specific prices at /pricing.json. GPT-5.6 Luna Standard is $0.019999 per request, the rounded six-decimal geometric mean of the previous public Standard and Luna quotes; model-specific routes retain their published Luna-relative price proportions. Service hub: https://gpt55.558686.xyz/x402/service and https://gpt55.558686.xyz/x402/service.json. Discovery assets: https://gpt55.558686.xyz/openapi.json, https://gpt55.558686.xyz/llms.txt, https://gpt55.558686.xyz/tools.json, https://gpt55.558686.xyz/apis.json, https://gpt55.558686.xyz/directory-submission.json. Agent and MCP metadata: https://gpt55.558686.xyz/.well-known/agent-card.json, https://gpt55.558686.xyz/.well-known/ai-catalog.json, https://gpt55.558686.xyz/.well-known/mcp/server-card.json, https://gpt55.558686.xyz/server.json. Integration hub: https://gpt55.558686.xyz/integrations and https://gpt55.558686.xyz/integrations.json. Best for agents that need one-call GPT-5.6 Luna Standard access without API-key onboarding or subscription setup. Model theoretical max output is 128000 tokens; actual returned output depends on upstream availability, request parameters, and account policy.

Deep endpoint trust/QoS report for an x402 endpoint. Everything the trust score returns PLUS history detail: the full payment-terms drift log (including custody/payTo changes), the discovery/listing timeline across directories, the paid-delivery sample log, and a summarized counts-by-outcome breakdown with latency percentiles. Raw per-probe rows are never shipped. Use for auditing or investigating a specific endpoint's reliability over time.

The deeper tier: everything in the standard report plus a deterministic static-pattern scan of the verified source (tx.origin auth, delegatecall, selfdestruct, unchecked calls, reentrancy surface, etc. - heuristic triage, not a formal audit), more holders, and a web reputation check. Still evidence, never a verdict. USDC (x402/MPP). Not cached.

The day's biggest percentage gainers across US equities, with current and previous-day OHLCV per ticker. From x402stock, a pay-per-call market & economic data API for AI agents. No API key or account; pay in USDC via x402.

Spend-guard preflight: deterministic 0-100 score for an x402 resource URL before an agent pays it. Probes GET by default, or a caller-supplied/discoverable GET or POST method and JSON body. Decodes asset-aware terms and only scores USD price sanity for recognized USD-pegged default assets, plus origin /.well-known/x402.json, Bazaar presence, and observed age. Raw signals in every response; auditable. Not an endorsement.

Buyable: one URL, one card. Unpaid 402 dry-read. Says if a stock x402 v2 EVM client can pay. Does not settle. Does not send funds. Informational only. Not an endorsement of the resource. Not a guarantee a later settle will succeed.