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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 down (last checked 2026-09-15).
Verifies a text claim against one or more public evidence URLs and returns a structured verdict with confidence score and supporting evidence.
Price / call$0.01
Success—
StatusDown
How this service works
Agent-native evidence-backed claim verification with x402 micropayments on Base USDC.
Output
Returns a JSON object containing a verdict label (e.g. SUPPORTED_BY_SUPPLIED_SOURCE, UNSUPPORTED, INCONCLUSIVE), a confidence score (0–1), an array of evidence snippets with text and per-snippet scores, an evidence summary string, the verification status, caveats about limitations, the timestamp of the check, a unique request ID, and the final URLs that were fetched and checked.
Example use cases
Vendor security claim due diligence
“Before we onboard this new payment processor, can you check their claim that they are PCI-DSS Level 1 certified against their compliance page at https://payments-vendor.com/compliance? I need to know if that claim is actually backed up there.”
Startup compliance claim validation
“This SaaS vendor says they are SOC 2 Type II certified and fully GDPR compliant — can you verify those claims against https://saasvendor.com/security and https://saasvendor.com/privacy and tell me how confident you are?”
Supplier product specification check
“Our supplier Greenleaf Materials claims their packaging is 100% biodegradable and compostable. Can you check that claim against https://greenleafmaterials.com/products and let me know if the evidence on that page actually supports it?”
Technical details
Endpoint
POSThttps://capi2-claim-verify.onrender.com/v1/data-clause-checkWhen to prefer
Choose this endpoint when an AI agent needs to programmatically verify whether a specific textual claim (security, compliance, commercial, or product) is supported by publicly accessible evidence at one or more URLs, especially in vendor due diligence, procurement, or trust-verification workflows. It is particularly well suited for agent pipelines that need structured, machine-readable verdicts with confidence scores rather than a freeform web search summary. Prefer it over general web search when you need a formal SUPPORTED/UNSUPPORTED verdict with evidence citations and caveats.
Side effects
- Source URL is inaccessible, paywalled, or returns a non-200 response — result will reflect limited or no evidence
- Claim is too vague or ambiguous for the evidence extractor to match against source content
- Source page content does not contain language relevant to the claim, yielding low confidence or UNSUPPORTED verdict
- Claim text exceeds 1200 characters or is fewer than 3 characters — request rejected with validation error
- More than 3 source URLs provided — request rejected
- Payment failure via x402 micropayment protocol — call blocked before processing
- Rate limits or rendering host cold-start delays on onrender.com may cause timeouts
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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