x402-protocol-integration

Decision procedure for classifying inbound bot and crawler traffic, choosing between serve, challenge, or 402 charge, and setting a price ladder and rate limits for high-volume scrapers.

Nouveaux endpoints x402 et variations de volume d'appels depuis le scan précédent (dédoublonné cross-source).

Minimal L402 demo endpoint returning a random fortune cookie message.

Mutinynet Faucet L402 Auth

Paid agent-facing brief on real-world service reservation confirmation and no-show risk decision procedure for agents paying via x402 · Build a decision procedure or schema for: real-world service reservation confirmation and no-show risk decision procedure for agents paying via x402. Include inputs, thresholds, failure modes. Falsifier: If free docs already solve the decision, paid product fails.. Blunt decision procedure, not marketing.

Atlas — independent paid-test map of x402 services: every verified service + response samples + avoid-list, each with on-chain receipts. Free human-readable reports: https://402atlas.com/report.html and https://402atlas.com/market-report.html (audit / discovery layer, not a task service)

Spark x420

Ship a paid API with x402: monetize an endpoint or proxy an upstream API, charged per call. As of 2026-08-10. A build guide for a paid API on x402: the verify-work-settle lifecycle, a minimal @x402/next or @x402/express server, proxying a paid upstream, charge-on-success for free, flat/dynamic/upto pricing, discovery so agents find it, and the abuse gotchas that bite. Agent-ready commands plus a ship checklist.

Practical gotchas integrating x402 Sign-In-With-X (SIWX). As-of 2026-08-15: integrator gotchas for the x402 SIWX extension. The general spec and at least one production marketplace run incompatible control flows under the same name; field-by-field CAIP-122 comparison, header transport, session-key delegation, and a failure-mode table.

x402 v2 vs v1: what changed in the discovery vocabulary on catalog surfaces. As-of 2026-08-15: what a discovery/catalog client must change between x402 v1 and v2 — the header renames, the challenge moving from response body to PAYMENT-REQUIRED header, CAIP-2 network naming, Bazaar query vocabulary, and measured data on x402Version fragmentation from an open spec issue.

Why recovering the payment signature does not secure x402 "redelivery". As of 2026-08-10. A tested x402 security gotcha: if your paid endpoint lets a buyer re-collect a stored result by re-presenting their payment, a chain observer can replay the settled (public) authorization and take the data for free. Why signature recovery does not close it, and three designs that do.

Classifies products into HS/HTS customs codes for import/export workflows. $0.10/call via x402.

Solana-native MCP gateway for SAP, DeFi tools, SNS identity, and x402 payments.

Make a $0.01 USDC tip through the x402 v2 flow. Returns a thank-you receipt. Lowest-friction first payment to verify x402 flow.

Trust score for an x402 seller.

Your 402 envelope can pass every static check and still not get you paid. We build a real signed payment at your listed price and submit it to the CDP facilitator verify endpoint, which checks signature, requirements and the on-chain transfer simulation. Nothing settles, so no money moves. You get back whether a real payment would be accepted, and if not, the facilitator own reason verbatim. Pass ?url= or ?domain=.

Retrieves thesis information or analysis related to the x402 classification or category.

Returns the authoritative nameservers for a given domain.

Returns information about autonomous systems including routing and network details.

Checks whether a domain appears on known blocklists or blacklists.

Validates whether an email address exists and is deliverable.

Provides reputation and trust scoring information for specified domains.

Retrieves information about IP network ranges and their associated details.

Returns domain names associated with a given CNAME record through reverse DNS lookup.