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Agent Buyer Identity Preflight | x402 Purchase Governance
x402
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, $0.05/call, status unknown (last checked 2026-09-14).
Checks whether an AI agent's buyer role, budget, and risk profile are appropriate before it purchases an x402-gated API, dataset, or tool.
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 Base network identifier (eip155:8453), the product type, an assessment block with a numeric risk score, risk level (low/medium/high), and any policy flags, plus identity, activity, and provenance sub-objects describing the agent buyer context.
Example use cases
Pre-purchase safety check for data API
“I want to buy access to a premium x402 market data feed for up to $5 USDC — can you run a preflight to make sure my agent role and risk profile are approved before we pay?”
High-sensitivity tool purchase screening
“My agent is about to purchase an x402 identity verification tool, budget is $2.50 USDC and I need low risk tolerance — check whether the purchase is cleared before proceeding.”
Automated agent spend routing validation
“Before my agent autonomously routes spending to buy that x402 ML inference API with a $20 USDC budget and medium risk tolerance, verify that the spend route plan is valid and flags are clear.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent/spend-route-planWhen to prefer
Use this endpoint when an AI agent needs to make an x402-protocol purchase and you want a lightweight, pre-transaction governance check to ensure the buyer role, budget, and sensitivity align with policy — especially in autonomous agent workflows where human approval is not guaranteed before each spend event.
Side effects
- Missing or malformed 'task' query parameter returns a validation error
- Budget parameter not matching numeric pattern causes schema rejection
- Invalid risk_tolerance enum value results in bad request
- Upstream policy service unavailable causes 5xx response
- Task description too short (under 3 chars) or too long (over 500 chars) triggers validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "agent-spend-route-plan",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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