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Agent Spend Assurance
x402
Agent Spend Assurance is a paid API for AI agents from hermesplant.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-13).
Runs a deterministic safety gate on wallet risk and x402 payment policy before consequential agent actions, returning an allow/deny decision with HMAC-signed evidence receipts.
Price / call$0.25
Success—
StatusUnknown
How this service works
One signed preflight for an autonomous x402 payment: WalletGuard counterparty screening, Payment Policy challenge validation, and structured evidence verification. Returns allow, deny, or needs_review plus the component findings and a tamper-evident service receipt. Caller-provided wallet context only; no external chain-intelligence feed.
Output
Returns a JSON object with an overall allow/deny decision, wallet risk level and score, recommended action (e.g. 'proceed_with_standard_controls' or 'sign_and_retry_payment'), a payment-specific sub-decision, and an HMAC-SHA-256 signed receipt with a verify URL for tamper-evident audit evidence.
Example use cases
Pre-payment wallet risk gate
“My agent is about to make an x402 payment to access a data API — can you run a spend assurance check on my wallet first and tell me if the risk level is low enough to proceed, and give me a signed receipt?”
Autonomous deploy safety check
“Before my agent executes that infrastructure deployment and the associated x402 charge, validate the wallet context and payment challenge and tell me whether to allow or block it, with a machine-readable evidence bundle.”
Compliance evidence for agent spend audit
“My agent just completed an autonomous purchase — run a spend assurance assessment on the wallet and payment details so I have an HMAC-signed receipt and verified evidence I can keep for our audit trail.”
Technical details
Endpoint
GEThttps://hermesplant.com/api/agent-services/spend-assurance/runWhen to prefer
Choose this endpoint when an AI agent needs a deterministic, policy-driven safety gate specifically for x402 payments combined with wallet risk scoring and tamper-evident receipt generation — particularly when audit trails and machine-readable evidence of spend decisions are required. Prefer this over generic fraud checks when the x402 protocol, wallet sanctions screening, and HMAC-signed receipts are all needed in a single call.
Side effects
- Missing required wallet or payment fields returns a validation error
- High-risk or sanctioned wallet triggers a deny decision with a block recommended action
- Invalid or replayed x402 challenge may return a deny with replay-detected evidence
- Malformed bodyType or method enum causes a 400-level rejection
- Unreachable receipt verify URL may indicate a transient service issue
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| runId | string | Optional caller run identifier. |
| wallet | object | WalletGuard context: wallet plus optional labels, sanctionsHits, exposures, transfers, and fundingSources. |
| payment | object | Payment Policy input: resource, x402 challenge fields, buyer policy, and optional replay context. |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "assessed",
"wallet": {
"riskLevel": "low",
"riskScore": 0,
"recommendedAction": "proceed_with_standard_controls"
},
"allowed": true,
"payment": {
"allowed": true,
"decision": "allow",
"recommendedAction": "sign_and_retry_payment"
},
"receipt": {
"algorithm": "HMAC-SHA-256",
"verifyUrl": "https://hermesplant.com/api/receipts/verify"
},
"service": "spend-assurance",
"decision": "allow",
"evidence": {
"decision": "verified",
"verified": true
},
"recommendedAction": "sign_and_retry_payment"
}
}Tags
x402
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