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CAPI2 Agent Commerce - Action Notary
x402
CAPI2 Agent Commerce - Action Notary is a paid API for AI agents from capi2-agent-commerce.vandurmedries.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-13).
Performs programmable authority checks on agent actions and returns tamper-evident SHA-256 receipts with allow/deny decisions.
Price / call$0.03
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 'decision' field ('allow' or 'deny'), an 'integrity' object with SHA-256 hashes of the action, evidence, and authority inputs, and a unique 'receipt_id' prefixed with 'an_' serving as a tamper-evident audit record.
Example use cases
Pre-execution authorization for financial transfers
“I need you to check whether this payment action is authorized before you send it — submit the transaction details as the action, include my delegation token as the authority, and give me back the receipt ID so I have proof it was cleared.”
Audit trail for multi-agent pipeline steps
“Every time an agent in our pipeline completes a step, I want you to notarize it — send the completed action object and the evidence logs to the action notary and store the receipt ID alongside the step record so we have an immutable audit trail.”
Authority enforcement for sensitive data access
“Before pulling that customer record, verify the agent has authority to access it — send the data-access action and the agent's authority object to the notary, and only proceed if the decision comes back as allow.”
Technical details
Endpoint
POSThttps://capi2-agent-commerce.vandurmedries.workers.dev/v1/action-notaryWhen to prefer
Choose this endpoint when you need both an access-control decision and a cryptographic, tamper-evident receipt in a single call — particularly in autonomous agent workflows where auditability and non-repudiation matter. Prefer it over simple auth checks when you need SHA-256 integrity proofs over the action, evidence, and authority inputs, or when downstream compliance requires a receipt ID. Best suited for agentic pipelines that must demonstrate authorized execution to third parties.
Side effects
- Payment not attached or insufficient — endpoint returns 402 requiring x402 USDC payment
- Invalid or malformed action/evidence/authority objects — returns validation error
- Evidence array exceeds 20 items — rejected due to maxItems constraint
- Authority check fails policy — decision returned as 'deny' rather than an error
- Network or worker timeout on Cloudflare edge — transient 5xx error
- Duplicate or replayed requests may generate new distinct receipt IDs since endpoint is not idempotent
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| action | object | |
| evidence | array | |
| authority | object |
Output
Schema · Response
{
"type": "json",
"example": {
"decision": "allow",
"integrity": {
"action_sha256": "...",
"evidence_sha256": "...",
"authority_sha256": "..."
},
"receipt_id": "an_..."
}
}Tags
x402
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