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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, $0.1/call, status unknown (last checked 2026-09-14).
Verifies whether an AI agent's buyer role, capability type, price, and approval policy are appropriate before it purchases an x402-gated API, dataset, or tool.
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
A JSON object containing a risk_level (e.g. 'low', 'medium', 'high'), a numeric risk_score, a list of flags indicating any policy violations or concerns, plus identity, activity, provenance, and assessment objects describing why the purchase was approved or flagged — all scoped to the EIP-155 Base network (eip155:8453).
Example use cases
Preflight before buying x402 dataset
“Before my agent pays for the dataset at https://datasets.example.com/v1/economic-indicators, can you do a preflight check with target type 'capability' and identifier 'economic-indicators-dataset' to see if the purchase is low-risk and within policy?”
Validate npm package purchase eligibility
“My agent wants to buy access to an x402-gated npm package called 'secure-llm-tools' version '2.1.0' — can you run a buyer identity preflight with target type 'package' to check whether this is authorized and what the risk level is?”
Governance check before agent acquires GitHub repo access
“Before my agent spends USDC on the x402-gated GitHub repo 'coinbase/agentkit', run a purchase governance preflight with target type 'repository', github owner 'coinbase', and repo 'agentkit', and let me know if there are any flags or policy blockers.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent/capability-security-preflightWhen to prefer
Use this endpoint specifically when an AI agent is about to make an x402 USDC payment for an API, dataset, tool, or capability and you need a governance/risk check before authorizing the spend. It is purpose-built for the x402 payment protocol and agent buyer identity scenarios, unlike generic fraud detection or OAuth authorization services. Prefer it when the purchase involves agent-to-agent or agent-to-API transactions on the Base network where policy compliance and risk scoring are required prior to payment.
Side effects
- Missing required fields (target_type or identifier) returns a validation error
- Unknown or unreachable x402_url may result in incomplete provenance data
- High risk_score or non-empty flags array indicates purchase should be blocked
- Invalid domain or github_owner pattern triggers schema validation rejection
- Service may return partial assessment if external identity sources are unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "agent-capability-security-preflight",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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