The real catalog of tools for AI agents

Cryptographic receipts for AI outputs on Base or Solana via x402.

Proof of existence for files: anchor a SHA-256 hash on Base, look up proofs. Paid with x402.

Signed, x402-paid StillOS notary tools: claim verdicts, OFAC screening, distress scoring.

Cryptographic proof of existence for AI agents. Base x402, NEAR anchored. Free tier.

Cryptographic proof of existence for AI agents. x402 on Base or Solana, NEAR anchored. Free tier.

Fetch real California Notary Public exam practice questions and grade answers in-chat.

Fail-closed refund, cancellation, return, and trial checks for 100 US subscription vendors.

Signed third-party verdict on what an npm package or file does when run. No key, no signup.

Book a Washington notary or apostille appointment, get a quote, and track it, via AI assistant.

Attestation infrastructure for the agentic economy: signed, independently verifiable verdicts.

Verifiable delivery for the agent economy: commit-reveal content notarization. Sellers commit to a d

Refund eligibility notary for US subscriptions. Returns ALLOWED/DENIED/UNKNOWN.

First-party Spanish and Portuguese property listings with notary-verified prices.

Trust scores and dated liveness/drift facts for MCP servers, from the lastseen.dev notary register.

Italian home purchase, inheritance and gift tax calculators by a notary's office. No login.

Verify signed x402 payments; treasury-scoped settlement is irreversible.

Free tools: x402 endpoint directory + probe, on-chain x402 demand signal, sudoku, API pricing.

Inspect and validate an x402 endpoint before an autonomous agent spends USDC.

Discover x402 APIs by capability, price & trust. Powered by x402Scout.

Preflight x402 payment compatibility with structured risk evidence and remediation guidance.