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Agent Payment Guard — x402 Payment Firewall Policy Creator
x402
Agent Payment Guard — x402 Payment Firewall Policy Creator is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).
Creates a payment guard policy that enforces risk scoring, budgets, domain allowlists, human approval thresholds, and replay protection for autonomous AI-agent x402 payments.
Price / call$0.1
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
Returns the created policy record including a policy ID, all configured enforcement parameters (budgets, domain allowlists, human-review thresholds, active hours, webhook), and audit retention settings that the payment guard will apply to subsequent x402 agent transactions.
Example use cases
Example prompt
“Set up a payment guard policy called 'ProductionAgentPolicy' with a daily budget of 50 USDC, a session budget of 10 USDC, max single payment of 2 USDC, human review required above 5 USDC, only allow payments to domains api.openai.com and api.anthropic.com, fail closed if the guard is unreachable, active from hour 8 to 20 UTC, and send alerts to https://my-webhook.example.com/alerts.”
Technical details
Endpoint
POSThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/payment-guard/policiesWhen to prefer
Use this endpoint when you need to create a new governance policy for AI-agent autonomous payments using the x402 protocol — specifically when you need budget caps, domain allowlists, human-in-the-loop approval triggers, replay protection, and webhook-based auditing configured as a reusable policy object. Prefer this over ad-hoc transaction checks when you want persistent, named policy enforcement across multiple agent sessions.
Side effects
- Invalid USDC amount strings (non-numeric or negative values) cause 400 Bad Request
- Malformed webhook URL returns validation error
- active_from_hour_utc or active_until_hour_utc outside 0-23 range causes 422 error
- Missing required policy name returns 400
- Duplicate policy name may return 409 Conflict
- Service unavailable on Cloudflare Workers edge returns 503
- Authentication/authorization failure returns 401 or 403
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| name | string | |
| fail_closed | boolean | |
| webhook_url | string | |
| allowed_tools | — | |
| retention_days | integer | |
| allowed_domains | — | |
| max_single_usdc | string | |
| allowed_purposes | — | |
| daily_budget_usdc | string | |
| session_budget_usdc | string | |
| active_from_hour_utc | integer | |
| active_until_hour_utc | integer | |
| human_review_above_usdc | string | |
| reservation_ttl_seconds | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"policy": {
"max_single_usdc": "0.10",
"daily_budget_usdc": "5.00",
"session_budget_usdc": "1.00"
},
"product": "agent-payment-guard-policy",
"profile_id": "policy_demo",
"agent_token": "agent_token_example",
"owner_token": "owner_token_example"
}
}Tags
x402
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