# Delx X402 Delivery Receipt Check

> Delx X402 Delivery Receipt Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Validates an X402 payment delivery receipt to confirm it is well-formed, contains required fields, and represents a successfully delivered payment.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/x402-delivery-receipt-check
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-x402-delivery-receipt-check-1fa6dad7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fzuLlJpGg3bkUrCTBI_c6

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 delx-x402-delivery-receipt-check-1fa6dad7 -d '<json body>'
```

Example prompt: Can you check this x402 delivery receipt and tell me whether it's valid — specifically whether the shape is correct, all required fields are present, and the payment shows as delivered?

## When to prefer this

Choose this endpoint when your agent needs to programmatically verify an X402 payment receipt before taking downstream action — especially in trustless or automated workflows where you cannot manually inspect receipts. It is preferable over custom validation logic because it runs in-memory with no data retention, returns a deterministic hash for audit trails, and makes zero external calls, making it safe for sensitive payment data.

## Known failure modes

- Malformed receipt object missing required properties returns missing_fields list with status 'fail'
- Receipt object exceeding 128 properties is rejected due to maxProperties constraint
- Invalid JSON or non-object receipt body returns a parse or validation error
- Network timeout or service unavailability returns HTTP 5xx

## How this service works

X402 Delivery Receipt Check: X402 Delivery Receipt Check checks receipt fields for payment id, resource, amount, and delivery status from bounded caller-supplied values without an external provider. Call X402 Delivery Receipt 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 Delivery Receipt Ch…

## Output

Returns a JSON object with a status field ('pass' or 'fail'), a shape_valid boolean, a list of missing_fields, an echo of the parsed receipt, and an evidence block containing a SHA-256 hash of the input, a retained flag (always false), and the count of external calls made (always 0). Also includes a schema identifier and operation name.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "receipt": {
   "type": "object",
   "description": "Receipt supplied to X402 Delivery Receipt 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": {
   "receipt": {
    "resource": "https://api.delx.ai/x402/utility/example",
    "delivered": true,
    "amount_raw": "1000",
    "payment_id": "pay-1"
   },
   "shape_valid": true,
   "missing_fields": []
  },
  "schema": "delx/util-x402-delivery-receipt-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "834990994a10325e5e595578ebbcf61447f6bc3ccd77c2008ce768f630056c28",
   "external_calls": 0
  },
  "operation": "delivery_contract:x402_delivery_receipt_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-x402-delivery-receipt-check-1fa6dad7/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)