# X402 Settlement Recipient Check

> X402 Settlement Recipient Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).

Validates that an x402 payment settlement recipient matches the expected pay-to address, returning acceptance/rejection status and mismatch reasons.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/x402-settlement-recipient-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-settlement-recipient-check-97b3d39d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Rhk9o9X9rMWT1orH7EhiX

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-recipient-check-97b3d39d -d '<json body>'
```

Example prompt: Before we accept this x402 payment, can you check whether the settlement recipient matches the pay-to address — pay_to is '0xAbC123...' and the recipient is '0xDef456...' — and tell me if there's a mismatch or if it's safe to proceed?

## When to prefer this

Use this endpoint whenever you need to verify x402 payment settlement integrity before accepting or executing a payment, particularly in agentic pipelines where challenge and result metadata come from caller-supplied or untrusted sources. It performs the check in-memory without external calls or data retention, making it suitable for security-sensitive pre-payment validation. Prefer this over manual address comparison when you need structured rejection evidence and normalized output.

## Known failure modes

- Missing or empty pay_to or recipient fields — validation cannot run without both values
- Addresses exceed maxLength of 8192 characters — request rejected
- Malformed address strings that cannot be parsed or normalized
- Network or service error returning 5xx — retry recommended
- Mismatch detected between pay_to and recipient — returns rejection status with specific mismatch reasons

## How this service works

X402 Settlement Recipient Check: X402 Settlement Recipient Check compares settlement recipient with the accepted pay-to address from bounded caller-supplied values without an external provider. Call X402 Settlement Recipient 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 Settlement Recipient…

## Output

Returns an explicit acceptance or rejection status, contract-specific validation checks, normalized evidence from the provided addresses, and detailed mismatch reasons explaining any discrepancy between the pay_to and recipient values.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "pay_to": {
   "type": "string",
   "maxLength": 8192,
   "description": "Pay To supplied to X402 Settlement Recipient Check; used only for this bounded calculation and processed in memory without retention."
  },
  "recipient": {
   "type": "string",
   "maxLength": 8192,
   "description": "Recipient supplied to X402 Settlement Recipient Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "actual": "0x1111111111111111111111111111111111111111",
   "matched": true,
   "expected": "0x1111111111111111111111111111111111111111"
  },
  "schema": "delx/util-x402-settlement-recipient-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "e670f19cbdd7aaae3edbde715feff65196c9b5cafb580a8d0d7ef09720d6cffa",
   "external_calls": 0
  },
  "operation": "delivery_contract:x402_settlement_recipient_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-settlement-recipient-check-97b3d39d/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)