# AgentProof Verify Claim Sources

> AgentProof Verify Claim Sources is a paid API for AI agents from agentproof.hatchable.site, paid per call via x402, $0.2/call, status unknown (last checked 2026-10-12).

Verifies and cross-references the sources behind a claim, returning a provenance receipt with integrity hash for autonomous transaction trust

## Facts

- Endpoint: POST https://agentproof.hatchable.site/api/paid/verify_claim_sources?utm_source=zero.xyz
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentproof-verify-claim-sources-684421ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X_al-Y0yIIOuC9xBoFRVK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agentproof-verify-claim-sources-684421ec -d '<json body>'
```

Example prompt: Can you verify this claim — 'The Federal Reserve raised rates by 0.25% on March 20, 2024' — and give me a provenance receipt with a source integrity hash so I can include it in my autonomous transaction audit trail?

## When to prefer this

Choose this endpoint when an AI agent or autonomous system needs tamper-evident, machine-readable proof that a claim is grounded in verifiable sources — particularly for compliance, audit trails, or multi-party trust in autonomous transactions. Prefer this over generic fact-checkers when you need a cryptographic integrity hash and a structured provenance receipt, not just a human-readable verdict.

## Known failure modes

- Claim sources are inaccessible or return 4xx/5xx errors — verification cannot complete
- Source content has changed since the claim was made — mismatch flagged in receipt
- Malformed or missing claim input — returns validation error
- Payment of 0.2 USDC not confirmed — request rejected with 402
- Timeout if source URLs are slow to respond — partial or failed receipt

## How this service works

AgentProof publishes Agent Transaction Passport™ and provides machine-paid evidence, provenance receipts, source comparison and change monitoring for autonomous transactions.

## Output

Returns a JSON object with ok status, tool name, and a receipt object containing a unique UUID receipt ID and a SHA-256 integrity hash, plus the AgentProof service identifier — forming a tamper-evident provenance record for the verified claim and its sources.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "urls": {
   "type": "array",
   "items": {
    "type": "string",
    "format": "uri"
   },
   "maxItems": 5,
   "minItems": 1
  },
  "claim": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "verify_claim_sources",
  "receipt": {
   "id": "uuid",
   "integrity_sha256": "..."
  },
  "service": "AgentProof"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentproof-verify-claim-sources-684421ec/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentproof.hatchable.site](https://www.zero.xyz/host/agentproof.hatchable.site/llms.txt)