# Services from checksum.openverbs.com on Zero

> checksum.openverbs.com serves 4 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/checksum.openverbs.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/checksum.openverbs.com/health.json

## Services

- [CRC-16 Integrity Checksum](https://www.zero.xyz/c/crc-16-integrity-checksum-27395fb1/llms.txt): $0.002/call via x402. Computes a CRC-16 checksum for a given data payload, supporting multiple CRC-16 variants (ccitt-false, xmodem, modbus, ibm) and input encodings (utf8, hex, base64).
- [Fletcher Checksum (Integrity Checksums)](https://www.zero.xyz/c/fletcher-checksum-integrity-checksums-18b5705c/llms.txt): $0.002/call via x402. Computes a Fletcher-16 or Fletcher-32 checksum over an input payload for data integrity verification.
- [Adler-32 Checksum Generator](https://www.zero.xyz/c/adler-32-checksum-generator-99bf2412/llms.txt): $0.002/call via x402. Computes an Adler-32 checksum for a given input payload, supporting UTF-8, hex, and base64 encoded data.
- [Integrity Checksums – CRC32](https://www.zero.xyz/c/integrity-checksums-crc32-166acf02/llms.txt): $0.002/call via x402. Computes a CRC32 checksum for an arbitrary data payload provided as a UTF-8, hex, or base64-encoded string

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)