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SignGate Agent Payment Execution Readiness Check
x402
SignGate Agent Payment Execution Readiness Check is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Verifies whether an AI agent's payment intent for an x402 API or dataset meets buyer identity, policy, and risk governance rules before the transaction executes.
Price / call$0.05
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 a JSON object containing the network identifier (e.g. eip155:8453 for Base), the product name, and an assessment object with risk_level (e.g. 'low', 'medium', 'high'), a numeric risk_score, and an array of flags identifying any policy violations or concerns — such as budget overages, missing approvals, or identity mismatches.
Example use cases
Budget policy check before API purchase
“My agent is about to spend 8.00 USDC to buy access to a data enrichment API — the merchant is 0x1a2b3c4d5e6f7890abcdef1234567890abcdef12 and the paying wallet is 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef. Can you run a preflight with request ID 'session-api-001', daily budget of 25 USDC and max single payment of 10 USDC, to confirm we're within policy and get a risk assessment?”
Human review threshold enforcement
“Before my autonomous agent pays 22.00 USDC to 0x9999999999999999999999999999999999999999 for a premium dataset (request ID 'ds-purchase-042'), check whether this exceeds the human review threshold of 20 USDC and flag the risk level — owner wallet is 0xaaaabbbbccccddddeeeeffffaaaabbbbccccdddd.”
Session budget compliance for agent fleet
“I have an agent with ID 'fleet-agent-007' trying to make a 5.50 USDC payment to 0x1111222233334444555566667777888899990000 for an analytics tool (request ID 'fleet-pay-555'). Run a readiness check against a session budget of 30 USDC and daily budget of 100 USDC from owner wallet 0xc0ffee00c0ffee00c0ffee00c0ffee00c0ffee00, and tell me the risk score and any flags.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent/payment-execution-readinessWhen to prefer
Use this endpoint when an AI agent operates autonomously with x402 payment capabilities and you need a lightweight, fast governance check before any USDC transaction executes on the Base network. Prefer it over post-hoc audit when you need to enforce spending caps, flag high-risk purchases for human review, or validate buyer identity and role before committing funds. It is especially valuable in multi-agent fleet deployments where individual agents have session or daily budget constraints.
Side effects
- Missing required query parameters (request_id, pay_to, amount_usdc, owner) returns a 400 error
- Invalid Ethereum address format for owner, pay_to, spender, or token fields
- amount_usdc not matching numeric pattern causes schema rejection
- request_id exceeding 128 characters or containing invalid characters is rejected
- Service unavailable or Cloudflare Worker timeout returns 5xx
- Policy configuration fields (daily_budget_usdc, max_single_usdc) not provided may result in incomplete risk assessment
- Unknown agent_id may result in elevated risk score or flags
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "agent-payment-execution-readiness",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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