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capi2 Claim Verify
x402
capi2 Claim Verify is a paid API for AI agents from capi2-claim-verify.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Verifies vendor, compliance, security, or commercial claims against supplied public evidence URLs, returning a verdict and confidence score.
Price / call$0.01
Success—
StatusUnknown
How this service works
Agent-native evidence-backed claim verification with x402 micropayments on Base USDC.
Output
Returns a structured JSON object containing a verdict (e.g. SUPPORTED_BY_SUPPLIED_SOURCE, UNSUPPORTED, INCONCLUSIVE), a confidence score (0–1), extracted evidence snippets with relevance scores, an evidence summary, source check statuses, caveats about scope, and a timestamped request ID. The agent can use the verdict and confidence to make procurement or compliance decisions.
Example use cases
Vendor security claim audit
“Before we renew our contract with CloudBase, verify their claim that 'all data is processed exclusively within EU data centers' — their trust page is at https://cloudbase.io/trust. Give me the verdict and any caveats.”
Procurement compliance check
“We're onboarding a new supplier who says they're ISO 27001 certified. Can you check their claim against their compliance page at https://supplierco.com/compliance and tell me if the evidence supports it?”
RFP vendor statement validation
“A vendor in our RFP stated 'our platform maintains 99.99% uptime guaranteed by SLA.' Verify that claim using their SLA documentation at https://vendor.com/sla and let me know the confidence level.”
Technical details
Endpoint
POSThttps://capi2-claim-verify.onrender.com/v1/procurement-claim-checkWhen to prefer
Choose this endpoint when you need evidence-grounded claim verification against specific public URLs rather than open-web search. It is purpose-built for procurement, vendor due diligence, and compliance workflows where you have a concrete textual claim and one or more authoritative source URLs to check against. Prefer it over generic web search when you want a structured verdict and confidence score you can pipe directly into a decision workflow.
Side effects
- Supplied URL is unreachable or returns non-200 — source_results will show failed status and evidence will be empty
- Claim text is too short (<3 chars) or too long (>1200 chars) — returns 400 validation error
- No relevant evidence found at the URL — verdict may be INCONCLUSIVE or UNSUPPORTED with low confidence
- Micropayment via x402 fails or wallet has insufficient USDC — payment rejected before processing
- URL content is behind a login or paywall — only publicly accessible content is checked
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claim | string | Vendor, product, compliance, security, or commercial claim to verify. |
| claim_id | string | |
| vendor_url | string | Public source URL containing evidence relevant to the claim. |
| source_urls | array | Optional list of up to three public evidence URLs. These are checked together; vendor_url remains supported for backward compatibility. |
| vendor_name | string | |
| request_type | string | |
| verification_type | string |
Output
Schema · Response
{
"type": "json",
"example": {
"claim": "Vendor states that customer data is encrypted at rest.",
"caveats": [
"Checks only the supplied public URL."
],
"verdict": "SUPPORTED_BY_SUPPLIED_SOURCE",
"evidence": [
{
"text": "Customer data is encrypted at rest.",
"score": 0.9,
"source_url": "https://example.com/security"
}
],
"protocol": "capi2.claim_verify/1.6.1",
"checked_at": "2026-08-26T15:00:00Z",
"confidence": 0.88,
"request_id": "cv_018f5f8f0c2b4f7a",
"vendor_url": "https://example.com/security",
"source_results": [
{
"status": "checked",
"final_url": "https://example.com/security",
"requested_url": "https://example.com/security"
}
],
"sources_checked": 1,
"evidence_summary": "Customer data is encrypted at rest.",
"verification_result": "supported",
"verification_status": "supported",
"evidence_source_urls": [
"https://example.com/security"
]
}
}Tags
x402
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