# X402 Settlement Network Check

> X402 Settlement Network 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 that a payment's settlement chain matches the accepted challenge network, returning a pass/fail verdict with mismatch reasons for x402 payments.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/x402-settlement-network-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-settlement-network-check-9b0b1ee3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nHrnfW8vTVoLKmDMx1F8B

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-settlement-network-check-9b0b1ee3 -d '<json body>'
```

Example prompt: Before we accept this x402 payment, check whether the settlement network 'base-mainnet' matches the accepted challenge network 'base-mainnet' — give me the verdict and any mismatch reasons.

## When to prefer this

Use this endpoint when operating within an x402 payment or agent delivery flow and you need a lightweight, no-external-provider check to confirm that the settlement chain in a result matches the network declared in the accepted challenge. Prefer this over manual string comparison when you need normalized evidence and structured mismatch reasons rather than a raw boolean.

## Known failure modes

- Missing or empty accepted_network or settlement_network fields returns a validation error
- Inputs exceeding 8192 characters are rejected
- Ambiguous or unrecognized network identifiers may result in inconclusive checks
- Network string formatting inconsistencies may cause false mismatches

## How this service works

X402 Settlement Network Check: compares settlement chain with the accepted challenge network using only bounded caller-supplied values. Call when you need a bounded x402 settlement network check result 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 Settlement Network Check as versioned determinist…

## Output

Returns an explicit accept or reject status, contract-specific validation checks, normalized evidence from the input networks, and a list of mismatch reasons explaining why the networks do or do not align.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "accepted_network": {
   "type": "string",
   "maxLength": 8192,
   "description": "Accepted Network supplied to X402 Settlement Network Check; used only for this bounded calculation and processed in memory without retention."
  },
  "settlement_network": {
   "type": "string",
   "maxLength": 8192,
   "description": "Settlement Network supplied to X402 Settlement Network Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "actual": "eip155:8453",
   "matched": true,
   "expected": "eip155:8453"
  },
  "schema": "delx/util-x402-settlement-network-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "3f67bde369ab9e2fa887e91c329b545b0ab55c7e5f31ec07cec47e8c94798178",
   "external_calls": 0
  },
  "operation": "delivery_contract:x402_settlement_network_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-settlement-network-check-9b0b1ee3/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)