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payment-protocol

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NexusPay is a reference implementation of an autonomous, budget-aware AI agent that buys its own data over the x402 HTTP payment protocol. You ask a question; it plans which paid sources to buy (Gemini), enforces per-query & daily budget caps, settles each purchase with testnet USDC over x402, and synthesizes everything it bought into one answer.

  • Updated Jun 19, 2026
  • Python

The on-chain trust-minimized counterpart to centralized custodial Agent-payment rails for per-token LLM API micropayments. Self-custodial, bounded-autonomy. Spec + bounded-formally-verified reference implementation. No token, no operator.

  • Updated May 26, 2026
  • JavaScript

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