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attester.dev

Independent verification of agent work products: citation-support checks and data/schema validation returning wallet-signed attestations (EIP-191), plus cited coding research that ships pre-verified with a signed attestation over its citations. Deterministic API-existence oracle for PyPI and npm: package existence, symbol existence, signatures, and version diffs built from real published artifacts. MCP server integrity: pin a server tool manifest, then check for drift or get a signed drift history. USDC on Base mainnet via CDP facilitator. Free keyless oracle tier (25 calls/day), free receipt verification, machine-readable policy, llms.txt + OpenAPI.

Resource URL

https://attester.dev/v1/package/exists

Payment options

exactBase (8453)

$0.002 USDC

Max amount

Pay to
0x57407D691F755cAa107647718F3582a8A87467dD
Timeout
300s

Tags

oraclepackageshallucination-checkx402agentshealth:ok

For agents

Prompt snippet for AI agents

Find and pay for this x402 resource:
URL: https://attester.dev/v1/package/exists
Type: http
Sources: cdp, agent-tools, ultravioletadao, thirdweb, x402-list

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