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CAPI2 Agent Commerce Claim Verifier
x402
CAPI2 Agent Commerce Claim Verifier is a paid API for AI agents from capi2-agent-commerce.vandurmedries.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).
Verifies a sustainability or commerce claim against provided evidence URLs and returns a confidence score with verification status and supporting sources.
Price / call$0.1
Success—
StatusUnknown
How this service works
Programmable authority checks and tamper-evident receipts for autonomous agents, sold through sustainable x402 commerce.
Output
A JSON object containing a confidence score (0–1 float), a verification_status string (e.g. 'supported', 'unsupported', 'uncertain'), and an array of evidence_source_urls that substantiate the verification result.
Example use cases
ESG supplier due diligence
“I need to verify the claim 'We source only Rainforest Alliance certified cocoa' from vendor CocoaEthics at https://cocoaethics.com — can you check it against these sources: https://rainforest-alliance.org/members/cocoaethics and https://cocoaethics.com/certifications and tell me how confident we should be?”
Marketplace listing fact-check
“Before I approve this seller listing, can you verify their claim 'All electronics are carbon-neutral certified' from https://greengadgets.io using https://greengadgets.io/carbon-cert and https://carbontrust.com/greengadgets as evidence sources?”
Sustainable brand audit
“Can you check whether the claim 'Zero single-use plastics in all product lines' from the brand NaturaPack at https://naturapack.com holds up, using https://naturapack.com/sustainability-report and https://epa.gov/naturapack-audit as supporting sources?”
Technical details
Endpoint
POSThttps://capi2-agent-commerce.vandurmedries.workers.dev/v1/claim-verifyWhen to prefer
Choose this endpoint when you need a machine-verifiable, evidence-backed assessment of a sustainability or commerce claim from a specific vendor, especially when you want a confidence score and traceable evidence URLs rather than a simple yes/no. It is particularly suited for agent workflows requiring receipts or audit trails for ESG, green, or product claims before publishing, approving, or transacting.
Side effects
- Claim text too short (below 3 characters) or too long (above 1200 characters) returns a 400 validation error
- Invalid or unreachable vendor_url returns an error or lowers confidence
- Source URLs that are inaccessible or irrelevant may result in low confidence score
- More than 3 source URLs provided returns a 400 validation error
- Payment of 0.1 USDC not completed via x402 protocol results in a 402 Payment Required response
- Malformed URI in vendor_url or source_urls returns schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claim | string | |
| vendor_url | string | |
| source_urls | array |
Output
Schema · Response
{
"type": "json",
"example": {
"confidence": 0.88,
"verification_status": "supported",
"evidence_source_urls": [
"https://example.com/security"
]
}
}Tags
x402
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