Task

Hmac One Time Password

1 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.

HOTP (counter-based) x402 REST usage

Generate an RFC 4226 counter-based HMAC one-time password from a base32 secret and counter. Configurable digits (6–10, default 6) and algorithm (SHA1/SHA256/SHA512, default SHA1). An invalid base32 secret is a clean 400.

otp.openverbs.com Dev & Code 1 calls / 30d checked 2026-10-26

0.004 USDC per call per call

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