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Ecosystem Showcase & Launches

: Open-source x402 payment middleware + autonomous agent payment client for Arc, built and battle-tested across 1,400+ live nanopayments

: Builders adding pay-per-call APIs, agent-to-agent payments, or creator monetization on Arc

: Fork our middleware factory to gate any endpoint at any price in one line

AgoraFX is an autonomous AI agent that creates African FX prediction markets, pays for its own rate data via x402, 

stakes USDC on its own predictions, and lets analysts earn per article — all settled on Arc. We open-sourced the x402 

middleware and payment client we built to get there, since none of this tooling existed in circlefin/arc-* repos when 

Server side — gate any endpoint at any price:

  from x402_middleware import make_x402_guard

      payer: str = Depends(make_x402_guard(price_usdc=0.001))

      "https://your-api.com/your-endpoint",

, env vars, and Circle Agent Wallet wiring: 

: Python (FastAPI backend, async agent client)

: x402 V1 protocol → EIP-712 signing → Circle Gateway settlement → on-chain USDC transfer

: Circle Agent Wallet (developer-controlled, non-custodial) for the paying agent

: FastAPI, works with any ASGI app via Depends()

: every payment decision logged with a SHA256 hash for auditability

: per-endpoint price + resource override via factory pattern — one middleware function, unlimited price points

: Ready launch on testnet, not yet mainnet-audited

: Circle developer-controlled wallets — no exposed private keys, entity secret never touches our server

: x402 SDK 2.13.0 requires a manual patch for V1 protocol compatibility (documented in repo); Circle Gateway requires maxTimeoutSeconds ≥ 7 days, undocumented elsewhere

: Contracts passed automated SolidityScan (0 critical findings); manual third-party audit planned before mainnet

https://github.com/MusaAis/agorafx#readme

https://youtube.com/shorts/tT0AxR-Rhb4?si=8M5mdVdkgL-RuS4A

1. If you're building pay-per-call APIs on Arc — what's your current blocker with x402 V1 vs V2 compatibility?

2. Anyone integrating Circle Agent Wallets for autonomous agent payments — what stack are you on, and did you hit the same Gateway endpoint documentation gaps we did?

How to integrate AgoraFX's x402 nanopayment layer as a developer

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