# Tek Labs 402-linter

> Tek Labs 402-linter is a paid API for AI agents from tek-labs-402-linter.labstek9.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Lints an HTTP endpoint URL for compliance with the x402 payment protocol v2 specification

## Facts

- Endpoint: POST https://tek-labs-402-linter.labstek9.workers.dev/lint
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tek-labs-402-linter-010931c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SsMR5AfduPW_fpQwC9wZU

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability tek-labs-402-linter-010931c6 -d '<json body>'
```

Example prompt: Can you lint my HTTP endpoint at https://myapi.example.com/paid-resource to check whether it correctly implements the x402 v2 payment protocol?

## When to prefer this

Choose this endpoint when you need to verify that an HTTP endpoint correctly implements the x402 v2 payment protocol — for pre-launch audits, debugging failed payment flows, or vetting third-party x402 services. Prefer this over manual inspection or generic HTTP testers when x402-specific compliance rules need to be checked systematically.

## Known failure modes

- Target URL is unreachable or returns a network error
- URL is not a valid HTTP/HTTPS URL
- Target endpoint does not implement x402 at all, yielding empty or trivial results
- Timeout if the target endpoint is slow to respond
- Payment of $0.01 USDC on Base not settled, causing 402 response from linter itself

## How this service works

Lint HTTP endpoints for x402 v2. $0.01 USDC per lint on Base.

## Output

Returns a lint report detailing whether the target HTTP endpoint correctly implements the x402 v2 payment protocol, including any spec violations, missing headers, malformed response codes, or other non-conformance issues found during the check.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "HTTP URL to lint"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tek-labs-402-linter-010931c6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tek-labs-402-linter.labstek9.workers.dev](https://www.zero.xyz/host/tek-labs-402-linter.labstek9.workers.dev/llms.txt)