# Doormat Capital x402lint Deep Lint API

> Doormat Capital x402lint Deep Lint API is a paid API for AI agents from x402lint.sebastiaan-ba3.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Performs deep conformance checking of an x402-compliant endpoint, including manifest cross-check and on-chain asset verification, paid in USDC on Base via x402.

## Facts

- Endpoint: POST https://x402lint.sebastiaan-ba3.workers.dev/deep-lint?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/doormat-capital-x402lint-deep-lint-api-90fb71c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oiCd-JL13QbhKNNP0nccy

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 doormat-capital-x402lint-deep-lint-api-90fb71c2 -d '<json body>'
```

Example prompt: Run a deep conformance check on my x402 endpoint at https://mypaidapi.example.com/resource — I want the full audit including manifest cross-check and on-chain asset verification, not just the basic lint.

## When to prefer this

Use this endpoint when you need a comprehensive x402 conformance audit that goes beyond basic syntax checking — specifically when you need manifest cross-validation and on-chain asset verification on Base. Prefer the free /lint endpoint for quick syntactic checks; use /deep-lint when preparing for production deployment or debugging complex x402 integration issues where on-chain state matters.

## Known failure modes

- Missing or invalid X-PAYMENT-TX header returns 402 with payment challenge
- Unreachable target URL returns an error finding
- Malformed URL input causes validation failure
- On-chain asset verification failure if Base network is unreachable
- Target endpoint not implementing x402 at all results in low score and multiple findings
- Payment transaction hash not yet confirmed on-chain causes verification to fail

## How this service works

x402 endpoint conformance checker. Free /lint works standalone; /deep-lint adds manifest cross-check and on-chain asset verification, paid in USDC on Base (x402). Pay by sending USDC to the address in the 402 challenge, then retry with header X-PAYMENT-TX: <tx hash>. Introductory pricing through 17 Oct 2026 on /deep-lint (0.03 USDC normally) — see the 402 response for the current amount.

## Output

Returns a JSON object with an 'ok' boolean indicating overall conformance, a numeric score (0-100), and a 'findings' array listing specific conformance issues or violations discovered during the deep lint, manifest cross-check, and on-chain asset verification.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "properties": {
    "queryParams": {
     "url": "https://example.com/paid-endpoint"
    }
   }
  },
  "output": {
   "properties": {
    "example": {
     "ok": true,
     "score": 90,
     "findings": []
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/doormat-capital-x402lint-deep-lint-api-90fb71c2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402lint.sebastiaan-ba3.workers.dev](https://www.zero.xyz/host/x402lint.sebastiaan-ba3.workers.dev/llms.txt)