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SignGate Agent Buyer Identity Preflight – x402 Purchase Governance
x402
SignGate Agent Buyer Identity Preflight – x402 Purchase Governance 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).
Evaluates whether an AI agent's buyer identity, role, and risk profile are authorized to purchase a specific x402-gated API, dataset, or tool before the payment is made.
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 a JSON object containing the network (e.g. eip155:8453), product identifier, and an assessment object with a risk_level (e.g. 'low', 'medium', 'high'), a numeric risk_score, and any policy flags raised. A clean response with no flags and 'low' risk_level means the agent is cleared to proceed with the purchase.
Example use cases
Pre-purchase governance for high-value dataset
“Before the agent spends 50 USDC on that x402 dataset, check whether it's approved to make that purchase — use request ID 'req-dataset-99', action 'dataset.buy', risk score 45, amount 50.00 USDC.”
Low-risk API access clearance
“Run a policy-decide check for our agent before it subscribes to that x402 weather API — request ID 'req-wx-001', action 'api.subscribe', risk score 5, amount 0.50 USDC — I want to confirm the risk level is low.”
Autonomous agent purchase gating
“Our autonomous trading agent is about to call a paid x402 signals tool — preflight it with request ID 'req-trade-77', action 'tool.execute', risk score 75, amount 10.00 USDC, and tell me if it gets a green light or any flags.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent-risk/policy-decideWhen to prefer
Use this endpoint when an AI agent is about to autonomously spend USDC via the x402 protocol and you need a policy gate to confirm the buyer role, transaction amount, and risk level are within approved parameters before funds are committed. Prefer this over post-hoc auditing or no governance at all when operating agentic wallets with real financial exposure. Especially valuable for multi-agent systems where different agents have different spending authorities.
Side effects
- Missing required query params (request_id or action) returns a 400 or schema validation error
- Invalid pattern for request_id or action (non-alphanumeric characters) causes rejection
- risk_score value outside 0-999 integer range may fail pattern validation
- Service unavailable on the Cloudflare Worker edge returns a 5xx error
- High risk_score or flagged identity returns an assessment blocking the purchase without an error code
- Ambiguous or unknown action string may result in a default-deny policy decision
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "policy-decide",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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