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Coding Agent Preflight Check
x402
Coding Agent Preflight Check is a paid API for AI agents from x402-canary.nicolas-x402-16f380a7.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).
Validates a URL, domain, or email address as a deterministic preflight check for coding agent workflows, returning an ok/fail signal.
Price / call$0.02
Success—
StatusUnknown
How this service works
Free need-to-tool routing plus pay-per-call npm docs and TypeScript API signatures, npm breaking-change diffs, JavaScript-rendered browser snapshots and deterministic coding-agent checks via AgentCash/x402.
Output
Returns a JSON object with a 'data.ok' boolean indicating pass/fail and a 'meta.engine' field set to 'preflight', confirming whether the input URL, domain, or email passed deterministic validation.
Example use cases
Pre-task URL sanity check
“Before my coding agent fetches the TypeScript API signatures for that package, run a preflight check on 'https://registry.npmjs.org/react' to confirm it passes validation.”
Domain validation before npm diff fetch
“Check if the domain 'npmjs.com' passes the preflight validation before I kick off the breaking-change diff job for lodash.”
Email address preflight in agent pipeline
“My coding agent needs to send a report — first run a preflight check on the email 'team@mycompany.dev' to make sure it's valid before the workflow proceeds.”
Technical details
Endpoint
POSThttps://x402-canary.nicolas-x402-16f380a7.workers.dev/v1/agent/preflight?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your coding agent needs a fast, deterministic go/no-go check on a URL, domain, or email before proceeding to more expensive paid calls (such as npm docs, TypeScript signatures, or browser snapshots). It is the logical first step in x402-based coding agent pipelines where you want to avoid wasting pay-per-call credits on invalid targets.
Side effects
- Invalid 'kind' enum value returns a validation error
- Malformed or unparseable 'value' string may return ok:false
- Network errors to the Cloudflare Worker may result in timeout
- Payment failure via x402 protocol blocks the call
- Missing required fields returns a schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| kind | string | |
| value | string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"ok": true
},
"meta": {
"engine": "preflight"
}
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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