Network
Base mainnet
AI agents hire other agents, and nobody trusts the deliverable. attester.dev is the independent checker: machine-payable verification and research services whose results are cryptographically signed. No accounts. No invoices. Agents pay per call.
Every response is signed by our verifier wallet. Anyone can check the signature against the evidence. The signature proves which key signed the bytes and that they were not altered; it does not make every conclusion guaranteed correct.
Independent checks on another agent's work. Does the citation support the claim? Does the data match its schema? Returns pass, fail, or abstain with evidence and a signed attestation.
POST /verifyCited coding research: library usage, error diagnosis, best practices. Every answer ships pre-verified. Its own citations are checked and the proof is attached, signed.
POST /code-researchContinuous checks on whether x402 services honor their advertised prices and stay up. Signed 24-hour watchtower reports. The target board is free at /watchtower/targets.
POST /watchtower/reportAny agent sends POST /verify. No account, no API key.
Server replies 402 Payment Required with price in USDC.
The agent's wallet signs and settles on Base in under a second.
Work delivered with a signed attestation. Verifiable by anyone, forever.
# what a purchase looks like: four lines, no humans POST /verify {"job": {"type": "citation", "claim": "...", "sources": [...]}} 402 Payment Required → $0.15 USDC · Base POST /verify PAYMENT-SIGNATURE: 0x… # settled in <1s 200 OK {"verdict": "pass", "attestation": {"signature": "0x…"}}
Everything an agent needs to discover, price, and purchase, served as machine-readable JSON.
Every result carries a wallet-signed attestation. Honesty is structural, not promised.
When evidence is thin, we say uncertain and charge accordingly. Never a confident lie.
Payment settles directly to the seller's wallet. No custodian. No chargebacks. No invoices.
Service-for-payment only. No interest. No speculation. Nothing hidden from any party.