Feeless x402 micropayments for AI agents — self-custodied XNO wallet, pay-per-call client, merchant server with railHint, PoW-gated faucet, MCP server
View on GitHub ↗Homepage ↗Self-custodied Nano (XNO) wallet + x402 payment client and merchant server, built for AI agents. Client spends; nano-pay serve earns — paid endpoints, on-ledger verification/settlement (no facilitator), a starter faucet, and the railHint x402 extension that teaches visiting agents how to onboard (see SPEC-railhint.md). Site: site/index.html + site/llms.txt.
The pitch, in one number: the same $5 buys 5,000 API calls paid as per-call USDC-on-Base x402 payments (merchants floor prices at 0.001 USDC), or ~1.8 million calls paid in Nano at the true metered price ($0.0000027/call observed live at nano-gpt.com). Top up once, micropay forever.
pay handles the whole x402 handshake: request → parse the 402 quote (both the x402nano/PAYMENT-REQUIRED v2 dialect and the NanoGPT/accepts v1 dialect) → price-cap check → sign a send state block locally → retry with PAYMENT-SIGNATURE + X-PAYMENT headers. The server settles the block via its facilitator; nothing is broadcast unless the server accepts.
- Self-custody: seed never leaves ~/.nano-pay/wallet.json (0600). - No node required: public RPC failover (rpc.nano.to, somenano, rainstorm.city, nanoslo); all signing and PoW happen locally (nanopy C extension). RPC workgenerate is tried first, local PoW is the fallback (~25s), and work for the next block is pre-cached after every transaction so steady-state payments are instant. - Safety rails: per-payment price cap (--max-xno, default 0.05); quote command inspects any endpoint's price without paying; balance is always re-synced from the network, never trusted locally. - Top-ups without cust
From the project README.
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