# X402 Catalog Route Check

> X402 Catalog Route Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Validates a single x402 catalog route by checking tool, method, path, and price against bounded caller-supplied values, returning acceptance or rejection with mismatch reasons and normalized evidence.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/x402-catalog-route-check
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-catalog-route-check-04e942ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VwPdVz7WCMZJB5vmmokB3

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 x402-catalog-route-check-04e942ed -d '<json body>'
```

Example prompt: Before we pay for this x402 route, check it for me — here's the route object with its tool name, method, path, and price — tell me if it's valid or if there are any mismatches I should know about.

## When to prefer this

Use this endpoint when you need a lightweight, in-memory, provider-free validation of a single x402 catalog route before paying for or accepting an x402 call. Prefer it over manual inspection when you need structured mismatch reasons and a deterministic accept/reject verdict. Ideal for pre-payment guard rails in agentic workflows where the route metadata is caller-supplied and cannot be implicitly trusted.

## Known failure modes

- Route object exceeds 128 properties (maxProperties limit), causing a validation error
- Missing required route fields (tool, method, path, price) may result in incomplete checks or rejection
- Caller-supplied values that are malformed or out of expected bounds may produce a rejection with mismatch reasons
- Network or service unavailability returns a non-200 response

## How this service works

X402 Catalog Route Check: X402 Catalog Route Check checks one catalog route for tool, method, path, and positive price from bounded caller-supplied values without an external provider. Call X402 Catalog Route Check before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Catalog Route Check as versioned det…

## Output

Returns a structured verdict for the route including: explicit acceptance or rejection status, contract-specific check results, normalized evidence derived from the route, and a list of mismatch reasons if the route fails any check. No external provider is called; all processing is in-memory and bounded.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "route": {
   "type": "object",
   "description": "Route supplied to X402 Catalog Route Check; used only for this bounded calculation and processed in memory without retention.",
   "maxProperties": 128,
   "additionalProperties": true
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "valid": true,
   "checks": {
    "post": true,
    "x402_path": true,
    "positive_price": true,
    "required_present": true
   },
   "missing_fields": []
  },
  "schema": "delx/util-x402-catalog-route-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "9dc71648dce13552b300e68108c726ac002d670dfe5442b398a035206009d2be",
   "external_calls": 0
  },
  "operation": "delivery_contract:x402_catalog_route_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-catalog-route-check-04e942ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)