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Bounty Engineer Evidence Pack Verifier
x402
Bounty Engineer Evidence Pack Verifier is a paid API for AI agents from bounty-engineer-x402-prod.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-12).
Verifies that specific quoted claims are present in caller-supplied source texts, returning per-claim verdicts with byte offsets, freshness info, and a tamper-evident pack hash.
Price / call$0.02
Success—
StatusUnknown
How this service works
Machine-buyable infrastructure for autonomous agents: API cost routing, margin optimization, funding-rate data, webpage extraction, result verification, spend controls, retry planning, state, tender search and GitHub bounty intelligence.
Output
A JSON object with per-claim verdicts (quote_present, not_found, etc.), UTF-16 start/end offsets of each quote within its source, a SHA-256 of each source text, a top-level pack_sha256 for the entire response, a boolean all_quotes_found, freshness status per claim, and a limitations list clarifying what is and isn't verified.
Example use cases
AI citation audit for research report
“I have a research report where my AI cited three pricing claims with quotes from vendor websites — can you check that each quoted snippet actually appears verbatim in the source pages I scraped, and give me a signed evidence pack with SHA-256 hashes so I can prove the quotes were real at time of verification?”
Automated fact-check before publishing
“Before my agent publishes this product comparison article, verify that all 8 quoted specs like '512GB storage' and '48MP camera' are literally present in the source pages I fetched — max source age 7200 seconds — and flag any quote that can't be found.”
Legal-grade claim provenance for compliance
“I need to prove that the regulatory claims in this document — like 'approved by FDA in 2023' — are actually present word-for-word in the cited sources I've collected, with cryptographic hashes of each source so auditors can verify nothing was tampered with.”
Technical details
Endpoint
POSThttps://bounty-engineer-x402-prod.onrender.com/v1/evidence-pack?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographically attestable, offset-precise proof that a specific quoted string appears in a caller-supplied source document — ideal for AI citation auditing, compliance workflows, or automated fact-checking pipelines where you already have the source text and need a verifiable evidence pack. Prefer alternatives if you need semantic entailment checking (this only checks exact quote presence), independent source fetching, or claim truth evaluation beyond verbatim match.
Side effects
- Claims array is empty or exceeds 40 items — validation error
- Sources array is empty or exceeds 12 items — validation error
- A claim references a source_id not present in the sources array — unmatched source error
- Source text is truncated or differs from live page — quote not found even if claim is true
- max_age_seconds too low for available source timestamps — freshness flagged as stale
- Malformed URI in source URL field — schema validation failure
- Payment of 0.02 USDC not provided via x402 — 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claims | array | |
| sources | array | |
| max_age_seconds | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"mode": "evidence_pack",
"claims": [
{
"claim": "Pro is $25 monthly",
"index": 0,
"quote": "$25 per month",
"verdict": "quote_present",
"end_utf16": 32,
"freshness": "unknown",
"source_id": "s1",
"quote_found": true,
"start_utf16": 19,
"source_sha256": "e03b854ea32bb631569352ed4dfc3541a86da6ec8f82fd1415398f1536fb63dd",
"declared_age_seconds": null
}
],
"sources": [
{
"id": "s1",
"url": "https://example.com/",
"sha256": "e03b854ea32bb631569352ed4dfc3541a86da6ec8f82fd1415398f1536fb63dd",
"fetched_at": null
}
],
"limitations": [
"Checks exact quotation presence in caller-supplied source text, not claim entailment or truth. URLs and timestamps are caller supplied; source authenticity is not independently verified."
],
"pack_sha256": "d104f0d764836b0d6a48dd53e2a10f4b806d8b4738bcb2512a4e0b3b3125d66e",
"all_quotes_found": true
}
}Tags
x402
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