n8n × x402 Paywall

n8n-nodes-x402-paywall Turn any n8n workflow into a pay-per-call USDC endpoint. A production-quality n8n community node that drops an x402 paywall in front of any workflow. Clients get a 402 Payment Required, sign an EIP-3009 USDC authorization, and on settlement the node triggers the workflow and returns its result. Settlement runs onchain on Arc testnet via a self-hosted x402 facilitator. Built for the Agentic Economy on Arc — Nano-Payments hackathon (LabLab x Circle x Arc, April 2026). What's included: - X402 Paywall trigger node: owns the webhook, issues 402s, verifies and settles payments, then fires the workflow with payment metadata attached. - Self-hosted x402 facilitator for Arc testnet (Express + @x402/core + @x402/evm), since the public facilitator doesn't yet support Arc. - Burst client that signs and submits 50+ real paid requests to prove per-action economics. Live demo: deployed behind Caddy TLS on our VPS inside n8n 2.17.6. Unpaid: curl -k -i https://2.26.21.34/webhook/x402-demo Signed: pnpm burst -- --count 1 --url https://2.26.21.34/webhook/x402-demo First settlement onchain: https://testnet.arcscan.app/tx/0xc67c4fe4baac112e3ea03b4166539e08d1fa8911d7ba1ea4d4257d850adb168a Install: npm install n8n-nodes-x402-paywall Restart n8n — the X402 Paywall trigger appears in the node picker. Key config: HTTP method, path, price in USD (hackathon cap 0.01), network (arcTestnet), timeout, response mode. Credentials require a Pay-To EVM address and facilitator URL. Hackathon: Agentic Economy on Arc — Nano-Payments (LabLab x Circle x Arc, April 2026). Track: Best Autonomous Commerce Application. Team: Nikolay Micheev + Vadim Buss. Per-action price: 0.001 USDC. Evidence: 50+ settled transactions on Arc testnet, verified on Arcscan. Original work built for this hackathon — not a fork. External deps: @x402/core and @x402/evm (Apache-2.0). License: MIT