# Delx Commerce Checksum Meta API

> Delx Commerce Checksum Meta API 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).

Computes a cryptographic checksum (hash) of input content and returns the hex digest, byte length, and emptiness status.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/checksum-meta?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-checksum-meta-api-638954ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Sd3UfUWwYYoh-48QObXgi

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-checksum-meta-api-638954ed -d '<json body>'
```

Example prompt: Can you compute the SHA-256 checksum of this text: 'Hello, world!' and tell me the hex digest, byte length, and whether it's empty?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call, no-signup cryptographic hash of a string with metadata (byte count, emptiness flag) returned alongside the hex digest — especially in autonomous agent workflows where verifiable, on-chain micropayment billing via USDC/x402 is required. Prefer this over rolling your own hashing when you need an auditable, externally-verifiable checksum with structured metadata output.

## Known failure modes

- Missing content field returns an error
- Unsupported algorithm value may cause a 400 or validation error
- Empty content is processed but flagged with empty:true in the response
- Network or payment failure returns a 402 or 5xx error
- Malformed request body returns a validation error

## 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: ok (boolean success flag), hex (the hex-encoded hash digest), bytes (integer byte length of the input content), empty (boolean indicating if content was empty), schema (a versioned schema identifier), and algorithm (the hash algorithm used, e.g. sha256).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "content": {
   "type": "string",
   "description": "Input field: content."
  },
  "algorithm": {
   "type": "string",
   "description": "Input field: algorithm."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "hex": "1d6334fef87552e1f9ad7e36ae551606a62973215dcb6f9bcb2e580852febc3c",
  "bytes": 10,
  "empty": false,
  "schema": "delx/util-checksum-meta/v1",
  "algorithm": "sha256"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-checksum-meta-api-638954ed/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)