# AlgoVoi Pay (hosted payable rail)

> A hosted, tenant-free, chain-agnostic pay-per-call verification rail for AI agents. Pay per request
> over x402 in USDC, live across twelve mainnet chains (Algorand, Base, Monad, Polygon, Arbitrum,
> OP Mainnet, Arc, Solana, Stellar, Hedera, Voi, Tempo; Arc is Circle's USDC-native L1, live since
> 16 September 2026), with no account and no API key: the payment is the
> authentication. Every response returns an offline-verifiable Ed25519 receipt that recomputes from its
> own bytes.

Provider: AlgoVoi (did:web:pay.algovoi.co.uk). Docs: https://docs.algovoi.co.uk/algovoi-pay.

## Live skills (0.01 USDC per call)
- [Verify an x402/AP2 payment receipt](https://pay.algovoi.co.uk/pay/v1/verify/receipt)
- [Verify an RFC 9421 HTTP message signature](https://pay.algovoi.co.uk/pay/v1/verify/rfc9421)

## Chain-agnostic negotiation
- [Negotiate a lane](https://pay.algovoi.co.uk/pay/v1/negotiate): POST {chains, protocols} -> shared lanes + a recommended pick, across twelve chains and x402/MPP/AP2/A2A. Read-only.

## Discovery
- [Agent card](https://pay.algovoi.co.uk/.well-known/agent-card.json)
- [x402 index](https://pay.algovoi.co.uk/pay/v1/index)
- [x402 descriptor](https://pay.algovoi.co.uk/.well-known/x402)
- [Bazaar-shaped catalog](https://pay.algovoi.co.uk/discovery/resources)