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Nomos Execution Environment Preflight API
x402
Nomos Execution Environment Preflight API is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $2/call, status unknown (last checked 2026-09-14).
Assesses the risk level and flags of a code execution action within a specified environment before an autonomous agent proceeds with execution.
Price / call$2
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 identifier (e.g. eip155:8453), product name, and an assessment object with a risk_level (e.g. 'low'), a numeric risk_score, and a flags array listing any detected risks or concerns about the execution environment.
Example use cases
Pre-execution safety gate for agent
“Before my agent runs any code in this cloud sandbox environment, can you do a preflight risk check using Nomos to confirm the risk score is low and there are no flags before it proceeds?”
Automated CI/CD agent risk screening
“My deployment agent is about to execute a build script — run a Nomos execution environment preflight for a CODE_EXECUTION action in the staging environment and tell me if the risk level comes back as anything other than low.”
Agentic workflow safety checkpoint
“I'm building an autonomous workflow where agents can run code — can you add a Nomos preflight check before each CODE_EXECUTION step so we catch any high-risk flags before anything actually runs?”
Technical details
Endpoint
POSThttps://base-agent-preflight.bytoken2023.workers.dev/x402/v1/execution/environment-preflightWhen to prefer
Choose this endpoint when an autonomous agent needs to gate code execution behind a risk assessment step — especially in agentic pipelines where safety and compliance are required before proceeding. Prefer this over generic health checks when you specifically need a structured risk_score, risk_level enum, and flags array scoped to code execution actions on a target environment.
Side effects
- Invalid or missing action type returns a validation error
- Unknown or unsupported environment identifier may return an error or elevated risk score
- Payment failure (insufficient USDC) blocks the request with a 402 response
- Malformed request body causes a 400 error
- Service unavailability on Cloudflare Workers returns a 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| action | CODE_EXECUTION | |
| environment | string |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "nomos-execution-environment-preflight",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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