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CAPI2 Agent Commerce – Action Guard
x402
CAPI2 Agent Commerce – Action Guard is a paid API for AI agents from capi2-agent-commerce.vandurmedries.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Performs programmable authority checks on proposed autonomous agent actions and returns tamper-evident, risk-scored decisions with detailed findings.
Price / call$0.02
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 'block'), a 'findings' array of objects each with a 'code' indicating the specific policy violation (e.g. 'price_mismatch'), and a 'risk_score' integer (0–100) reflecting the overall danger level of the proposed action.
Example use cases
Pre-execution safety gate for agent fleet
“Before my agent submits that marketplace order, run an authority check — here's the authority config and the proposed buy action — and block it if the risk score is high or there's a price mismatch finding.”
Audit trail for autonomous financial actions
“My agent is about to transfer funds autonomously — validate the proposed transfer action against the authority object and give me a tamper-evident decision receipt I can log.”
Policy enforcement in multi-agent pipeline
“One of the agents in my pipeline wants to call an external API — check its authority object and the proposed API-call action, then tell me whether to allow or block it and what findings triggered the decision.”
Technical details
Endpoint
POSThttps://capi2-agent-commerce.vandurmedries.workers.dev/v1/action-guardWhen to prefer
Choose this endpoint when you need a programmatic, per-action authorization gate for autonomous agents — especially when you require tamper-evident decision receipts and structured risk scores rather than a simple boolean allow/deny. It is particularly suited for agentic pipelines where agents are performing financial or high-stakes actions and you want fine-grained findings (e.g. price_mismatch codes) rather than coarse policy enforcement.
Side effects
- Malformed authority or proposed_action objects may result in validation errors or unexpected block decisions
- High risk scores may be returned for actions that are actually legitimate if authority rules are misconfigured
- x402 payment failure at $0.02 USDC will prevent the check from executing
- Ambiguous or incomplete action schemas may lead to inconclusive findings
- Service availability depends on Cloudflare Workers uptime
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| authority | object | |
| proposed_action | object |
Output
Schema · Response
{
"type": "json",
"example": {
"decision": "block",
"findings": [
{
"code": "price_mismatch"
}
],
"risk_score": 100
}
}Tags
x402
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