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GW8 Spend Policy Check API
x402
GW8 Spend Policy Check API is a paid API for AI agents from micro-saas-agent.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-22).
Validates a proposed payment against a configured spend policy (per-tx limit, rolling cap, allowed hours, blocked categories) and returns a signed allow/deny decision receipt
Price / call$0.02
Success—
StatusUnknown
How this service works
[Spend policy: agent payment risk check] Before an AI agent pays an invoice or merchant: POST {payment, policy} -> allow / deny / needs_approval plus the rules that fired (per-tx limit, rolling cap, merchant categories, allow/deny lists, hours + timezone, assets/chains, approval threshold) and an Ed25519-signed receipt bound to your request hash. Deterministic, stateless, no custody, moves no money. Bad bodies rejected before payment. $0.02 USDC.
Output
Returns a JSON object with: a 'decision' field ('allow' or 'deny'), an array of 'checks' showing each policy rule evaluated with pass/fail and detail, a 'reasons' array for any denials, 'remaining' budget figures (perTx and rollingCap before/after), the policy engine version, and a cryptographically signed 'decisionReceipt' (Ed25519) with a verify URL — enabling tamper-proof audit of spend decisions.
Example use cases
Pre-payment policy gate for autonomous agent
“My agent is about to pay $420 USDC to acme-supplies.com for office supplies. Check my spend policy before it goes through — per-tx limit is $1000, 24-hour rolling cap is $5000 with $1200 already spent, and block anything in gambling or crypto-exchange categories.”
Enforce business-hours payment restriction
“I need to validate a $750 USDC payment to a SaaS vendor on a Saturday — my policy only allows payments Monday through Friday between 8am and 6pm Mountain Time. Tell me if this should be allowed or denied and give me a signed receipt.”
Check agent payment against rolling daily cap
“My agent fleet has a daily rolling cap of $5000 over 24 hours and has already spent $4800. Before sending another $420 USDC payment, check whether there's enough cap remaining and return the decision with a verifiable signed receipt.”
Technical details
Endpoint
POSThttps://micro-saas-agent.onrender.com/api/spend/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs a cryptographically auditable, policy-aware go/no-go decision before submitting a payment — especially when you need rolling cap tracking, time-of-day enforcement, category blocking, and a signed receipt for compliance. Prefer this over manual policy checks when you need a single atomic call that evaluates all spend rules simultaneously and returns a verifiable decision log. Best suited for agentic payment workflows using x402 on Base with USDC.
Side effects
- Missing or malformed 'policy' or 'payment' objects returns validation error
- Payment timestamp outside allowed hours triggers deny decision
- Amount exceeding per-tx limit triggers deny
- Rolling cap exceeded triggers deny
- Merchant category in blockedCategories triggers deny
- Recipient not in allowList triggers deny if allowList is configured
- Payment on non-allowed chain or with non-allowed asset triggers deny
- No charge on API failure — payment only settled after data is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| policy | object | |
| payment | object |
Output
Schema · Response
{
"type": "json",
"example": {
"checks": [
{
"rule": "per_tx_limit",
"detail": "420 <= per-tx limit 1000",
"result": "pass"
}
],
"engine": "gw8-spend-policy/1",
"reasons": [],
"decision": "allow",
"remaining": {
"perTx": "1000",
"rollingCapAfter": "3380",
"rollingCapBefore": "3800"
},
"decisionReceipt": {
"alg": "Ed25519",
"query": {
"decision": "allow",
"requestSha256": "7faa…"
},
"signed": true,
"payload": "eyJ2Ijox…",
"endpoint": "POST /api/spend/check",
"signature": "base64…",
"accessType": "SPEND_POLICY_DECISION",
"verify_url": "https://micro-saas-agent.onrender.com/api/receipt/verify",
"response_sha256": "…"
}
}
}Tags
x402
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