Tool detail

t1

Submits a claim with supporting evidence and returns an Ed25519-signed, ledger-chained verification receipt.

Categories: Agent trust safety

Use when

get a signed, verifiable receipt for a factual claim
record a claim and evidence in a public verification ledger

Not for

not a general fact-checking or search engine
not legal or financial advice

Inputs

POST JSON body: { claim: string (required, max 10k chars), evidence: string[] (optional, up to 100 items) }

Admitted input schema

{
  "type": "object",
  "properties": {
    "claim": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "The claim to verify (max 10k chars)"
    },
    "evidence": {
      "type": "array",
      "items": {
        "type": "string",
        "minLength": 0,
        "maxLength": 4096
      },
      "minItems": 0,
      "maxItems": 100,
      "description": "Supporting material; admitted as secondary-tier evidence"
    }
  },
  "required": [
    "claim"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://verify.clearsigned.com/verify/t1

Payment

Protocol: x402
Listed price: 0.05 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://verify.clearsigned.com/verify/t1
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z