Security x402 offerings

Verify one Ed25519 signature over up to 8,000 characters of exact UTF-8 receipt text using a supplied 32-byte public key. Returns cryptographic validity and message hash. Does not establish issuer id…

Check up to ten declared claim-evidence relationships against a finite, versioned rule set. Reports unsupported frame transfers and missing information. Unknown combinations remain unresolved. No prose interpretation, source inspection or truth certification.

Check a revision handoff before reusing evidence. Compare one initial or superseding transition with its declared predecessor; return lineage inconsistencies and an integrity receipt. Does not establ…

Exact full-release and section hashes plus deterministic bounded line changes for explicitly licensed original Maha section versions; no semantic equivalence claim.

Check a revision handoff before reusing evidence. Compare one initial or superseding transition with its declared predecessor; return lineage inconsistencies and an integrity receipt. Does not establ…

Check up to ten declared claim-evidence relationships against a finite, versioned rule set. Reports unsupported frame transfers and missing information. Unknown combinations remain unresolved. No pro…

Smart Contract Audit — Security review of a single contract

Smart Contract Audit — Security review of a single contract

Pre-trade safety check: oracle-immune-system verdict for one trade, with verifiable EIP-712 attestation support. BLOCK verdicts are complete checks and are charged.

Witness the SHA-256 fingerprint of a literary work: submit a title, content hash, and optional pen name; receive a tamper-evident, hash-chained receipt. Timestamping, not endorsement. We never see th…

Witness the SHA-256 fingerprint of a literary work: submit a title, content hash, and optional pen name; receive a tamper-evident, hash-chained receipt. Timestamping, not endorsement. We never see the work itself.

risk.address, sold by Taifoon: 1 seller behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.010…

Audit the buyer's public website using the audit tool. Produce an evidence inventory followed by conditional improvement options. For each option include its observed basis, when it would help, limit…

X1 threat intelligence, full machine-readable database: every blacklisted wallet and token with its reason, plus the related-wallet network built from on-chain funding links (463 related addresses as of 2026-09-17) that maps a rug creator to the rest of their cluster before they launch again. The public page warns people for free; this is the structured feed for machines.

X402 Delivery Content Type Check: compares delivery content type with buyer-accepted media types using only bounded caller-supplied values. Call when you need a bounded x402 delivery content type check result before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Delivery Content Type Check as versioned d…

Is this x402 endpoint safe to pay? Check it before your AI agent pays an endpoint it has not used before. Returns a go / caution / no_go verdict, the recommended payment option (network and amount) and the reasons (payment would fail, payout address on the OFAC sanctions list, over your budget, price above advertised, not HTTPS, unknown token). Never pays the endpoint. Cached 10 min. Bulk: 1000 credits for $0.80 via /api/v1/credits.

Should my agent pay this expensive x402 endpoint? Call it before a costly or repeated payment. Returns the go / caution / no_go verdict plus the full diagnosis, the endpoint's check history per day over 30 days, how reliable the seller's other endpoints are and whether the endpoint moved domains. Never pays the endpoint. Bulk: 1000 credits for $0.80 via /api/v1/credits.

Pay-per-call email validation via x402 (USDC on Base): syntax, MX lookup, SMTP deliverability, disposable / role-account / free-provider flags, typo suggestions, and a 0-1 confidence score.

Check the published 402 for response-level blockers when a service passes validate but is not indexed or showing up in Bazaar. Get a fix for each finding.

Is this x402 endpoint safe to pay? Reads its payment challenge (v1 body and v2 PAYMENT-REQUIRED header), lists every offer, then screens the payout wallet: OFAC SDN check, 0-100 trust score, risk band and proceed / hold / block with itemized flags. Flags offers that name different recipients. It scores the wallet that gets paid, not the service behind the URL. Free: GET /v1/endpoint. Trial: /v1/trial.

The Dexter x402 Facilitator is publicly available for any developer to integrate. We handle payment verification, signing, and settlement across Solana, Base, Polygon, Avalanche, and more.

Deterministic read-only audit of a public x402 v2 GET endpoint: protocol, payment binding, Base USDC, Bazaar discovery, leakage checks, remediations, and SHA-256 report integrity.

Heuristic calls-vs-unique-payers pattern score for the top x402 resources in the CDP Bazaar and PayAI catalogs: per resource price_usdc, unique_payers, calls, wash_risk (low/medium/high) and a reason. No input. A heuristic signal for due diligence before spending, not a finding about any seller. Cached 15 minutes.

Call before trusting or paying a third-party x402 seller: snapshot one listing from a fixed public directory (payapi, cdp, payai, bazaar) by its id/payTo, or pass ?since= to get told whether it changed since you last saw it. Reads public directories only - never a caller-supplied URL - and returns already-public fields (JSON).