2s.io Verifiable Random Function (VRF)

API ↗

2s.io Verifiable Random Function (VRF) is a paid API for AI agents from 2s.io, paid per call via x402, $0.0025/call, status unknown (last checked 2026-09-14).

Generates deterministic, publicly verifiable randomness from a seed string, signed with an EIP-191 signature so the result can be cryptographically verified offline

How this service works

Verifiable random function — deterministic, publicly verifiable randomness bound to your seed and signed by the 2s key. proof = deterministic EIP-191 signature over the seed (same seed always yields the same proof, so the outcome cannot be re-rolled or cherry-picked); random = keccak256(proof), a uniform 32-byte value. Returns the seed, signed message, proof, signer address, random (hex + uint + float in [0,1)). Verify offline: recover the signer from (message, proof) and confirm keccak256(proof) == random. For provably-fair draws, lotteries, sortition, and tie-breaks between agents.

Output

Returns a JSON object containing: the original seed, the EIP-191 signed message, the proof (deterministic signature), the signer address, and the random value expressed as a hex string, a uint256, and a float in [0,1). All fields are needed to independently verify the result offline by recovering the signer from (message, proof) and confirming keccak256(proof) equals the random field.