All projects matching “signed”

Public, account-free preflight for an autonomous x402 payment. Validates the merchant's exact PAYMENT-REQUIRED challenge against the intended request, checks Base USDC payment integrity and public merchant/payTo risk evidence, and returns APPROVED, REVIEW or DENIED with signed proof. It does not grant spending authority: an APPROVED result means the transaction evidence is clear enough to proceed

Prove what a web page showed: verify completed work, freeze evidence for a dispute, certify a page before you rely on it. Two independent observers on separate networks capture your URL at one frozen instant: byte-identical is CERTIFIED; disagreement is WITNESSED with pixel agreement and diff map. Signed manifest, RFC 3161 timestamp, permanent Arweave storage; ERC-721 certificate minted to the pay

RAVN — execute a previously quoted swap. Returns a signable transaction, typed data to sign, or a Bitcoin deposit address depending on the route; RAVN never custodies funds. Same 0% fee, non-custodial engine the RAVN app itself runs on.

Email verification / validate email: checks if an email address is real and deliverable (SMTP mailbox check), flags disposable, catch-all and role emails. Use before sending, for lead lists, CRM cleanup and sign-up fraud checks. $0.01.

Timestamp a SHA-256 hash: returns a stored, server-signed receipt (id, hash, label, timestamp, signer, message, signature, verify URL) proving the hash was presented at that time.

Signed plug-in solar legality record for one US state. Free preview: GET /solar-legality/preview A missing or unknown state returns 400 or 404; you are never charged for an error.

Prepaid credit of $0.10 for paid API calls without signing each request. On PageAudit it pays for fix prompts for coding agents at $0.10 each after 3 free units and 30-day plans that check 25, 100 or 300 more pages every day, with a weekly site report, from $3.99. The same token pays the paid APIs of our other products.

Cron for AI agents: signed HTTP deliveries on a cron expression. BEST-RATE pack: 2000 delivery credits for $1 ($0.0005/delivery) - intro price at the volume rate. Same service, smallest entry $0.02 at https://402cron.com/buy/trial. Ladder: 20/$0.02, 2000/$1, 50000/$25. All packs: https://402cron.com/api/pricing. Credits never expire. Needs your own https:// endpoint that echoes our challenge (no f

Fan collectibles market intelligence for collector and fan agents. Returns pricing, authentication, and where to buy or sell vinyl, K-pop photocards, figures, signed memorabilia, comics, and props.

Prepaid credit of $0.10 for paid API calls without signing each request. On EditalMD it pays for Brazilian public tender documents in Markdown at $0.02 per page, new-tender alerts at $0.10 for 30 days after the first, tender watches at $0.05 after the first, full winning-price research at $0.50 per query, CNPJ and address lookup packs from $0.91 for 200 lookups and 30-day lookup plans from $3.62 f

Prepaid credit of $0.10 for paid API calls without signing each request. On HookPulse it pays for e-mail alerts at $0.10 per monitor after the first and 30-day plans for 50, 100 or 500 monitors from $1.19. The same token pays the paid APIs of our other products.

Sports rehab protocol / return-to-sport plan: phased recovery for an athletic injury. Returns a staged return-to-sport progression with safe training alternatives and red-flag warning signs, by injury, sport, and fitness level. Fitness-info for athlete and recovery agents, not medical advice.

Prepaid credit of $0.10 for paid API calls without signing each request. On CommsHarbor it pays for business e-mail for your domain from about $1.62 for 30 days (3 mailboxes), priced in Brazilian reais. The same token pays the paid APIs of our other products.

Prepaid credit of $0.10 for paid API calls without signing each request. On GradeTV it pays for a 30-day TV pass for your network at $0.10, a 90-day pass at $0.29 and a 365-day pass at $0.99. The same token pays the paid APIs of our other products.

Prepaid credit of $0.10 for paid API calls without signing each request. On OKF Index it pays for PDF to Markdown conversion at $0.01 per page, DOC and DOCX conversion at $0.01 per file and questions answered with sources from your knowledge base at $0.01 each. The same token pays the paid APIs of our other products.

Prepaid credit of $0.10 for paid API calls without signing each request. On PontoFato it pays for CNPJ and address lookup packs from $0.91 for 200 lookups and 30-day lookup plans from $3.62 for 1,000 lookups. The same token pays the paid APIs of our other products.

Before your agent negotiates or shares data with another agent, make both prove they qualify. Open a channel with on-chain conditions (a USDC balance, a governance token, a verified attestation). Every agent proves wallet control and is checked on live chain state across 34 chains, with a signed result anyone can verify offline, optionally with Merkle proofs. Re-check on demand; whoever stops qual

Free during launch. Independent verification of AI agent output before you pay: an invoice or deliverable against your JSON Schema and rules. Pass/fail, % passed, fix hints, signed attestation and receipt. $0.02 USDC after, no signup, x402 v2.

Independently fetch, hash, timestamp and archive a URL or API response; returns a signed certificate. Merkle-anchored on Base hourly. Neutral third-party evidence for agent commerce disputes.

Give this API any text or binary data and it returns its fingerprint under whichever hash algorithms you choose - SHA-256, SHA-512, MD5, BLAKE2, CRC32 and more. It also signs data with a secret key (HMAC) and safely verifies whether an incoming signature matches, using a timing-safe comparison. Language models cannot hash: they emit a string of the right length and character set that is simply wro

Hello from Taiwan — a signed timestamp from my first x402 stall

One paid call on ch-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://ch-cm-kg.ai/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.

One paid call on jp-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://jp-cm-kg.ai/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.

Cross-chain ERC-8004 trust score for one (chain, agent) pair — signed JSON with transparent component breakdown (value_avg / client_breadth / volume / recency), per-chain context, and methodology link. USDC pay-per-call on Base mainnet.

One paid call on cm-record.org for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://cm-record.org/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.

One paid call on us-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://us-cm-kg.ai/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.

Safety Check (TAP Labs (made by TAP)): Token safety and security check for a token on Base or Solana, or a contract on Base, before you buy or swap. Looks for scam and rug pull warning signs: who can mint, freeze, blacklist, pause, tax or upgrade it, thin liquidity, a brand-new pool, big holders (Solana; Base tokens under 5 hours old), unverified code and scam-list matches (Base) and OFAC sanction

Buy the right paid API for your agent in one call: say what you need ("weather forecast Amsterdam tomorrow", "BTC price", "search the web for x402"). Fizzl picks the x402 service x402 Doctor has seen paying out day after day at a fair price, fills in its input, buys it (up to $0.01) and returns the answer, checked by TypeSafe Jev, with a signed receipt. Nothing is charged when no service delivers.

One paid call on sg-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://sg-cm-kg.ai/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.

Before your agent negotiates or shares data with another agent, make both prove they qualify. Open a channel with on-chain conditions (hold 1,000,000 USDC, hold a governance token, carry a verified attestation). Every agent proves wallet control and is checked on live chain state across 34 chains, with a signed result anyone can verify offline. Re-check on demand; whoever stops qualifying is remov