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Nomos Service Preflight Risk & Authorization Check
x402
Nomos Service Preflight Risk & Authorization Check 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 a target API call before execution by returning identity, risk score, flags, and authorization assessment for autonomous agents.
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 with network (e.g. eip155:8453), product identifier, and an assessment block containing risk_level (e.g. 'low'), numeric risk_score, and flags array. May also include identity, activity, and provenance sub-objects for deeper agent decision-making.
Example use cases
Budget-aware agent payment gating
“Before my agent pays 0.50 USDC to call https://api.databroker.xyz/lookup for 'contact data enrichment', check the risk level and whether it's safe to proceed — my remaining budget is 10.00 USDC.”
Autonomous workflow safety screening
“I'm building an agent that auto-calls APIs. Before it executes a POST to https://api.legaldocs.io/sign for the purpose of 'contract signing' at a price of 2.00 USDC, run a preflight authorization check and tell me if there are any red flags or identity issues.”
Multi-step agent risk guardrail
“My agent is about to spend 0.10 USDC calling https://base-agent-preflight.bytoken2023.workers.dev/x402/v1/service/sms for 'sending alert notifications' — can you do a Nomos preflight assessment first and tell me the risk score, flags, and provenance details before it proceeds?”
Technical details
Endpoint
POSThttps://base-agent-preflight.bytoken2023.workers.dev/x402/v1/service/preflightWhen to prefer
Use this endpoint when an autonomous agent needs a lightweight, paid-per-call risk and authorization signal before executing an action — especially when the agent is about to spend crypto (USDC) on a service it hasn't vetted before. Prefer over manual URL inspection or static allowlists when operating in dynamic multi-service environments on Base/EVM chains.
Side effects
- Missing required query parameters (target_url, price_usdc, buyer_budget_usdc, purpose) returns validation error
- Invalid URL format for target_url returns schema rejection
- Payment not received or x402 payment failure results in 402 response before assessment is returned
- Malformed price strings (non-numeric) rejected by pattern validation
- Network or Cloudflare Worker timeout returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "nomos-service-preflight",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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