{"$schema":"https://wellknown.network/schemas/agent-record-v1.json","schemaVersion":"1","id":"ag_mbdzc6ug7ujx","handle":"clearsigned-mcp","url":"https://wellknown.network/agents/clearsigned-mcp","links":{"self":"https://wellknown.network/agents/clearsigned-mcp/record.json","html":"https://wellknown.network/agents/clearsigned-mcp","markdown":"https://wellknown.network/agents/clearsigned-mcp/record.md","api":"https://wellknown.network/api/v1/agents/clearsigned-mcp","status":"https://wellknown.network/api/v1/agents/clearsigned-mcp/status","claim":"https://wellknown.network/agents/clearsigned-mcp/claim","claimApi":"https://wellknown.network/api/v1/claims","claimDescriptor":"https://wellknown.network/agents/clearsigned-mcp/claim.json","badge":"https://wellknown.network/agents/clearsigned-mcp/badge.svg","openapi":"https://wellknown.network/openapi.json","history":"https://wellknown.network/api/v1/agents/clearsigned-mcp/history","tools":"https://wellknown.network/api/v1/agents/clearsigned-mcp/tools"},"ard":{"identifier":"urn:air::server:clearsigned-mcp","type":"application/mcp-server-card+json"},"kind":"mcp_server","declared":{"name":"clearsigned-mcp","summary":"MCP server for Clearsigned: calibrated claim verification for AI agents, paid per call over x402, receipts verified offline.","description":"# clearsigned-mcp\n\nAn MCP server that gives any agent a `verify_claim` tool: calibrated claim verification against\nlive web evidence, paid per call over x402 ($0.05 USDC on Base), with an Ed25519-signed receipt\nthe server verifies offline against Clearsigned's pinned published key before your agent sees it.\n\n## Tools\n\n| Tool | Paid? | What it returns |\n|---|---|---|\n| `verify_claim(claim, evidence?)` | $0.05 USDC | `SUPPORTED` / `REFUTED` / `UNVERIFIABLE`, calibrated confidence (a measured realized rate), per-source stances, receipt id, settlement tx, `signature_verified_offline` |\n| `quote()` | free | the price an unpaid request is quoted right now, decoded from the 402 |\n| `service_status()` | free | what is serving, ledger height, published buyer counts |\n\n`UNVERIFIABLE` is a real answer, not an error: the engine abstains instead of guessing. The price\nnever depends on the verdict; refunds exist only for failure to deliver. A request with no claim\nis refused locally, before any payment.\n\n## Install\n\n```bash\npip install clearsigned-mcp        # or: pipx install clearsigned-mcp\nexport CLEARSIGNED_BUYER_KEY=0x…   # an EVM key holding a little USDC on Base mainnet\nclearsigned-mcp                    # stdio transport\n```\n\nClaude Desktop / Claude Code / any MCP client:\n\n```json\n{\n  \"mcpServers\": {\n    \"clearsigned\": {\n      \"command\": \"clearsigned-mcp\",\n      \"env\": { \"CLEARSIGNED_BUYER_KEY\": \"0x…\" }\n    }\n  }\n}\n```\n\nThe key is used only to sign x402 payment authorizations from your own wallet. It is never sent\nto Clearsigned; the service sees the payment, not the key.\n\n## How to check us\n\n- Pin the key at https://verify.clearsigned.com/pubkey; this server does, and refuses a receipt\n  whose signature does not verify against it.\n- Walk the public hash-chained ledger at https://verify.clearsigned.com/ledger/verify; every\n  paid receipt and its on-chain settlement are separate events joined on payer and nonce.\n- Read the live figures at https://clearsigned.com/quality (…","publisher":null,"homepage":"https://clearsigned.com/llms.txt","repository":"https://github.com/diawest82/clearsigned-mcp","version":"0.1.0","license":"MIT","protocols":["mcp"],"tags":["mcp","x402","verification","fact-checking","agents","calibration"],"pricing":null,"endpoints":[{"url":"pypi:clearsigned-mcp","type":"package_pypi","auth":null,"probeable":false}],"skills":null,"tools":null,"extra":null,"attribution":{"kind":"pypi","name":"pypi","license":"pypi","repoUrl":"pypi","summary":"pypi","version":"pypi","description":"pypi","homepageUrl":"pypi"}},"derived":{"capabilities":[{"slug":"commerce.payments","name":"Payments","confidence":0.791,"provenance":"derived"}],"categories":["commerce"],"language":"en"},"observed":{"status":"unknown","statusReason":"Distributed as a package to run locally; no network endpoint to check.","lastOkAt":null,"lastProbedAt":null,"statusComputedAt":null,"reliability30d":null,"latestObservations":[],"tools":null,"package":{"name":"clearsigned-mcp","registry":"pypi","observedAt":"2026-11-09T01:27:43.007Z","publishedAt":"2026-09-26T03:57:13.965793Z","latestVersion":"0.1.0"},"toolSurface":null,"endpointFacts":[]},"verification":{"claimed":false,"claimedAt":null,"proofs":[]},"provenance":{"sources":[{"source":"pypi","key":"clearsigned-mcp","url":"https://pypi.org/project/clearsigned-mcp/","firstSeenAt":"2026-09-27T14:24:21.378Z","fetchedAt":"2026-11-09T01:27:04.026Z","normalizedAt":"2026-11-09T01:27:04.026Z"}]},"firstSeenAt":"2026-09-27T14:24:21.378Z","updatedAt":"2026-11-09T01:27:43.007Z"}