# Sindri Checksummed Identifier Generator

> Sindri Checksummed Identifier Generator is a paid API for AI agents from x402.outpimp.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Generates structurally valid checksummed identifiers (ISBN, UPC, VIN, IMEI) with real check-digit algorithms

## Facts

- Endpoint: POST https://x402.outpimp.com/generateChecksumFormat
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sindri-checksummed-identifier-generator-dde334c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lA_z_MZ4CHVUqfc7tWOA-

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 sindri-checksummed-identifier-generator-dde334c3 -d '<json body>'
```

Example prompt: Generate a valid ISBN-13 for me — I need a structurally correct book identifier with a real check digit, using the isbn field with variant 13.

## When to prefer this

Choose this endpoint when you need a single, structurally valid checksummed identifier (ISBN, UPC, VIN, or IMEI) with a correctly computed check digit — ideal for test data generation, mocking, QA pipelines, or any scenario requiring a realistic-looking but synthetic identifier. Prefer this over hand-rolling check digit logic or using random strings that fail validation.

## Known failure modes

- Invalid field enum value returns an error
- Unsupported locale may fall back to en_US or error
- Passing args to vin or imei (which accept no arguments) may be ignored or cause an error
- Payment failure (402) if USDC balance is insufficient
- Network timeout on rare occasions

## How this service works

Checksummed-identifier-format generator API. Generates a structurally valid isbn, upc, vin, or imei, each computed with its real check-digit algorithm. vin and imei take no arguments. Accepts optional locale (default en_US).

## Output

Returns a structurally valid checksummed identifier string (e.g. an ISBN-13, 12-digit UPC, 17-character VIN, or 15-digit IMEI) computed using the real check-digit algorithm for that format. The output passes standard validation checks for the chosen identifier type.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "args": {
   "type": "object",
   "description": "Method-specific options, e.g. {\"variant\":13} for isbn. Not accepted for vin/imei."
  },
  "field": {
   "enum": [
    "isbn",
    "upc",
    "vin",
    "imei"
   ],
   "type": "string",
   "description": "Which checksummed identifier format to generate."
  },
  "locale": {
   "type": "string",
   "default": "en_US",
   "description": "Locale code, e.g. \"en_US\", \"de\"."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sindri-checksummed-identifier-generator-dde334c3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.outpimp.com](https://www.zero.xyz/host/x402.outpimp.com/llms.txt)