# Delx Commerce — X402 Delivery Schema Check

> Delx Commerce — X402 Delivery Schema Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Validates that a result object contains all required fields specified in an X402 delivery contract, returning a pass/fail verdict with evidence of non-retention.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/x402-delivery-schema-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-x402-delivery-schema-check-991af278
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8p-Vz2F5_39EJDBzHYUTW

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-commerce-x402-delivery-schema-check-991af278 -d '<json body>'
```

Example prompt: Check whether this result object passes the x402 delivery schema — required fields are 'temperature', 'humidity', and 'timestamp', and the result is {"temperature":72,"humidity":55}: does it have all the required fields?

## When to prefer this

Choose this endpoint when you need a lightweight, privacy-preserving, pay-per-call schema check specifically within the x402 delivery protocol context — particularly when you need cryptographic evidence (SHA-256 hash) that input was not retained, and when operating in an autonomous agent payment pipeline on Base or Solana using USDC. Prefer it over general-purpose JSON schema validators when auditability and non-retention proof matter.

## Known failure modes

- Input result object exceeds 128 property limit — request rejected
- required_fields array exceeds 256 items — request rejected
- Malformed JSON body — 400 parse error
- Missing result or required_fields fields — validation may return unexpected results
- Network timeout — agent should retry with same idempotent payload

## How this service works

Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.

## Output

Returns a JSON object with schema_valid (boolean), missing_fields (array of field names absent from the result), an overall status ('pass' or 'fail'), and an evidence block containing a SHA-256 hash of the input, a flag confirming data was not retained, and a count of external calls made (always 0). Also includes the schema identifier and operation name.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "result": {
   "type": "object",
   "description": "Result supplied to X402 Delivery Schema Check; used only for this bounded calculation and processed in memory without retention.",
   "maxProperties": 128,
   "additionalProperties": true
  },
  "required_fields": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Required Fields supplied to X402 Delivery Schema Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "schema_valid": true,
   "missing_fields": []
  },
  "schema": "delx/util-x402-delivery-schema-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "5a2d2f997e6dd8109bb4a094caded4b79eb4c788696584b9ac0b919395398f9b",
   "external_calls": 0
  },
  "operation": "delivery_contract:x402_delivery_schema_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-x402-delivery-schema-check-991af278/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)