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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, $0.005/call, status unknown (last checked 2026-09-14).
Validates whether an AI agent's buyer identity, role, and budget are appropriate before it purchases an x402-gated API, dataset, or tool.
Price / call$0.005
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 with a risk_level (e.g. 'low', 'medium', 'high'), a numeric risk_score, an array of assessment flags, the resolved network identifier, product metadata, and provenance details — giving the agent a clear go/no-go signal before committing to an x402 payment.
Example use cases
Pre-purchase governance for paid RPC
“Before my agent calls that paid Ethereum RPC endpoint at https://rpc.exampleprovider.io/v1/eth, run a preflight on eip155:8453 for the eth_call method — my max price is $0.01 USDC and I have $1.50 left in this session.”
Screening high-sensitivity dataset purchase
“My agent wants to buy access to a financial dataset at https://datasets.example.com/v1/defi-prices — can you do a preflight check on Base (eip155:8453) for the GET method before it spends anything, with a max price of $0.05 USDC?”
Budget enforcement before agent tool acquisition
“Check whether my agent should be allowed to purchase this x402 tool at https://tools.example.com/v1/sentiment-analyzer on eip155:8453 using GET — my session budget is $0.50 USDC and I don't want to pay more than $0.02 per call.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent/rpc-preflightWhen to prefer
Use this endpoint before any x402-protocol purchase where agent identity governance, budget enforcement, or product-category compliance matters — especially when the buying agent operates autonomously and must self-validate authorization. Prefer this over skipping preflight when purchases involve sensitive data, high prices, or strict approval policies, and when you need a risk score to log or gate downstream actions.
Side effects
- Invalid or unreachable endpoint_url returns an error or elevated risk flag
- Malformed chain identifier (not matching CAIP-2 pattern) causes validation rejection
- Missing required query parameters (endpoint_url, chain, method) returns a 400-level error
- Session budget below the product price triggers a budget-exceeded flag in assessment
- Unknown or unsupported RPC method pattern may return an unresolvable identity warning
- Service itself is a Cloudflare Worker with no guaranteed uptime SLA — may return 5xx under load
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "agent-rpc-preflight",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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