# X402 Registry Route Check

> X402 Registry 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 2026-10-20).

Validates a runtime registry entry by checking tool, path, method, and upstream fields against caller-supplied values to accept or reject an x402 payment route before execution.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/x402-registry-route-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-registry-route-check-4661bdaa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ei3zoa4lS40SGqShTJKTt

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-registry-route-check-4661bdaa -d '<json body>'
```

Example prompt: Before we pay for this x402 route, can you check the registry entry and verify that the tool name, path, method, and upstream all match what was supplied — and tell me if it should be accepted or rejected?

## When to prefer this

Use this endpoint when you need to validate an x402 payment route or agent delivery route before committing to a payment or accepting a result. It is purpose-built for the x402 protocol ecosystem and runs entirely in-memory without external provider dependencies, making it suitable for pre-payment checks, compliance audits, and debugging route mismatches. Prefer this over generic HTTP validation tools when the specific concern is whether a route's tool, path, method, and upstream configuration are correctly registered.

## Known failure modes

- Route object missing required fields — returns rejection with explanation of missing fields
- Upstream mismatch detected — returns rejection with normalized evidence of the conflict
- Tool or path not found in registry — returns rejection with mismatch reasons
- Malformed route object exceeding maxProperties limit — returns validation error
- Ambiguous or incomplete method specification — returns rejection with detailed mismatch reasons

## How this service works

X402 Registry Route Check: X402 Registry Route Check checks one runtime registry entry for tool, path, method, and upstream from bounded caller-supplied values without an external provider. Call X402 Registry 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 Registry Route Check as versio…

## Output

Returns an explicit accept or reject status for the route, along with contract-specific validation checks, normalized evidence from the registry entry, and a list of mismatch reasons explaining any discrepancies found between the supplied route fields and the registered configuration.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "route": {
   "type": "object",
   "description": "Route supplied to X402 Registry 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,
    "required_present": true
   },
   "missing_fields": []
  },
  "schema": "delx/util-x402-registry-route-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "b926fbfd40e72c78cd55d9fac911150c42800e7bd73fe82f0e36994607482be0",
   "external_calls": 0
  },
  "operation": "delivery_contract:x402_registry_route_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-registry-route-check-4661bdaa/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)