# Services from otp.openverbs.com on Zero

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

## Services

- [TOTP Code Verifier (otp.openverbs.com)](https://www.zero.xyz/c/totp-code-verifier-otp-openverbs-com-ce8b63e0/llms.txt): $0.004/call via x402. Verifies a submitted TOTP code against a base32 secret with configurable clock-drift tolerance, returning whether the code is valid and the matching time-step offset.
- [OpenVerbs HOTP Generator](https://www.zero.xyz/c/openverbs-hotp-generator-0a250615/llms.txt): $0.004/call via x402. Generates an RFC 4226 counter-based HMAC one-time password (HOTP) from a base32 secret and counter value
- [OTP Provisioning URI Builder](https://www.zero.xyz/c/otp-provisioning-uri-builder-ea807bce/llms.txt): $0.004/call via x402. Builds an otpauth:// URI (used in authenticator QR codes) for a given TOTP or HOTP secret, with label, issuer, algorithm, digits, and period/counter.
- [OpenVerbs TOTP Generator](https://www.zero.xyz/c/openverbs-totp-generator-08b4773a/llms.txt): $0.004/call via x402. Generates an RFC 6238 time-based one-time password (TOTP) from a base32 secret, returning the code, counter, and seconds remaining in the window.

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)