Vadzim arlouski@buss2020956

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

In this hybrid hackathon powered by Arc and Circle, developers will build the next generation of Agentic economic applications using Circle’s Nanopayments infrastructure with settlement on Arc in USDC. For the first time, high-frequency, usage-based transactions between users, APIs, and AI agents can operate without gas overhead eroding margin. Arc provides stablecoin-native settlement with predictable, dollar-denominated USDC fees and deterministic, sub-second finality — enabling real-time coordination and economically viable per-action pricing at scale. 📅 April 20 – 26, 2026 • Apr 20 – 25 (Online): Submit projects by Apr 25. • Apr 25 (On-site Build – SF, CA): Teams refine projects. • Apr 26 (On-site Demos & Awards – SF, CA): Live pitches & winners announced. Get guidance from Arc and Circle experts through on-site support. 📍 On-site Venue (April 25-26): MindsDB SF AI Collective 3154 17th St, San Francisco, California, USA 🤝 Go solo or team up, it's your flow. 🏆 Compete for a $15,000+ Prize Pool. 📍 Please note: If approved for the on-site experience, you’ll also have the opportunity to showcase your project live. Travel and accommodation will not be covered. 🧑🏻‍💻 Secure your spot now – sign up before the Kick-Off Stream!