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Evidence Verification API
x402
Evidence Verification API is a paid API for AI agents from hermesplant.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Validates a collection of evidence artifacts (x402 receipts, payment decisions, approvals, logs) against a configurable policy and returns a machine-readable verified/rejected decision with confidence score.
Price / call$0.05
Success—
StatusUnknown
How this service works
Verify an agent-commerce evidence bundle before trusting a paid result. Checks x402 challenge, receipt, policy-decision, and service-response artifacts; endpoint, method, network, payTo, and price binding; artifact source, freshness, hashes, and synthetic-proof leakage. Returns verified / needs_review / rejected / insufficient_evidence with per-rule evidence. Deterministic — loop it over every paid call in an agent run.
Output
A JSON object containing: a top-level verification status ('verified' or 'rejected'), a boolean verified flag, a confidence score (0–1), an array of reason codes, a summary of total/hashed/synthetic artifacts, a list of missing required artifacts, and a recommendedAction string (e.g. 'persist_evidence_and_use_result') plus a unique requestId for audit tracing.
Example use cases
Gate autonomous infrastructure deploy
“I'm about to run a Terraform apply. Can you verify these artifacts — the x402 receipt, payment policy decision, and agent run log — against our deploy policy that expects serviceId 'infra-deploy', method POST, and maxArtifactAgeSeconds 120 before I let the agent proceed?”
Validate x402 payment before agent spend
“Before the agent finalizes this API purchase, verify the x402 challenge and receipt artifacts against a policy requiring payTo 0xDEF, priceCents 500, and at least 2 artifacts — I need a confidence score and recommended action back.”
Confirm human approval before SQL execution
“The agent wants to run a destructive SQL migration. Please verify the human_approval artifact and the agent_run_log against our policy that requires requireHumanApproval true and minArtifacts 2, and flag any missing or expired evidence.”
Technical details
Endpoint
GEThttps://hermesplant.com/api/agent-services/evidence/verifyWhen to prefer
Choose this endpoint when an AI agent needs a deterministic, policy-driven safety gate before executing consequential or irreversible actions — particularly those involving x402 payments, infrastructure changes, shell commands, SQL mutations, Git operations, or MCP tool calls. It is especially valuable when you need machine-readable evidence preservation with confidence scoring and audit trails, rather than a simple boolean approval check.
Side effects
- Missing required artifacts array causes 400 validation error
- Artifacts exceeding maxArtifactAgeSeconds result in decision 'rejected' with reason code 'evidence.stale'
- Policy field mismatches (wrong serviceId, payTo, or priceCents) return verified:false with specific reason codes
- Malformed artifact objects cause schema validation errors
- Network timeout or service unavailability returns 5xx with no decision
- Insufficient artifact count relative to minArtifacts yields rejection with missingArtifacts populated
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| policy | object | Verification policy: expected serviceId/endpoint/method/network/payTo/priceCents, allowedSources, minArtifacts, maxArtifactAgeSeconds, and require* flags per artifact type. |
| subject | object | Optional run subject: kind, serviceId, endpoint, method, resourceUrl, runId. |
| artifacts | array | Evidence artifacts (shared Hermes contract): x402_challenge, x402_receipt, payment_policy_decision, service_response, agent_run_log, human_approval, and other typed artifacts. |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "verified",
"service": "evidence-verify",
"decision": "verified",
"verified": true,
"requestId": "ev_<uuid>",
"confidence": 0.94,
"reasonCodes": [
"evidence.verified"
],
"artifactSummary": {
"total": 3,
"hashed": 3,
"synthetic": 0
},
"missingArtifacts": [],
"recommendedAction": "persist_evidence_and_use_result"
}
}Tags
x402
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