# Delx Checksum Meta

> Delx Checksum Meta is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Computes a hash digest and byte size for caller-supplied content, returning deterministic checksum metadata as JSON

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/checksum-meta
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-checksum-meta-941d908b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i0Z2FmiGRJtet-svs8SWW

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-checksum-meta-941d908b -d '<json body>'
```

Example prompt: Can you compute the SHA256 hash and byte size of this text: 'Hello, world! This is my content payload.' — I need the checksum metadata to verify it later.

## When to prefer this

Choose this endpoint when you need a lightweight, stateless, deterministic hash and byte-size computation for caller-held content without any external calls or data retention — ideal for agent preflight checks, pipeline deduplication, or integrity verification where privacy and reproducibility matter.

## Known failure modes

- Missing or empty content field returns an error
- Unsupported algorithm value causes a validation error
- Malformed JSON request body returns 400
- Payment not included or insufficient USDC results in 402 response

## How this service works

Return hash digest and byte size for caller-held content — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls. Sibling of Delx routes that already conver…

## Output

A deterministic JSON object containing the hash digest of the input content computed with the specified algorithm, the byte size of the content, and the algorithm name used — suitable for integrity verification, deduplication, or preflight checks.

## 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-checksum-meta-941d908b/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)