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Circle Products & Developer Toolings

Looking for a head start? We've been publishing a growing collection of open-source sample applications that demonstrate real-world use cases powered by USDC, Arc, Circle Wallets, Gateway, and related developer tools. These projects are designed to be forked, customized, and used as starting points for your own applications.

Below is a quick overview (for full sample app details, check 

This sample app demonstrates gasless USDC nanopayments using Circle Nanopayments on Arc. - circlefin/arc-nanopayments

GitHub - circlefin/arc-nanopayments: This sample app demonstrates gasless USDC nanopayments using Circle Nanopayments on Arc.

Demonstrate gasless USDC nanopayments using 

 on Arc. A LangChain agent acts as the buyer, autonomously paying for paywalled resources, while a Next.js web app acts as the seller, exposing x402-protected endpoints and providing a seller dashboard to monitor payments and withdraw earnings.

Circle Gateway batches many signed offchain authorizations into a single onchain settlement, enabling economically viable sub-cent payments.

This sample app demonstrates a seamless, gasless P2P payment system on Arc. - circlefin/arc-p2p-payments

GitHub - circlefin/arc-p2p-payments: This sample app demonstrates a seamless, gasless P2P payment system on Arc.

Modern peer-to-peer payment system. This sample application uses Next.js, Supabase, and Circle Modular Wallets with Passkey security to demonstrate a seamless, gasless P2P payment system on the Arc Network.

This sample app demonstrates a multi-chain treasury management system with cross-chain interoperability. - circlefin/arc-fintech

GitHub - circlefin/arc-fintech: This sample app demonstrates a multi-chain treasury management system with cross-chain interoperability.

Modern multi-chain treasury management system. This sample application uses Next.js, Supabase, and Circle Developer Controlled Wallets, Circle Gateway and Circle Bridge Kit with Forwarding Service to demonstrate a multi-chain treasury management system with bridge capabilities.

This sample app demonstrates an end-to-end escrow workflow — from contract creation and deposit, through AI-validated deliverable submission, to fund release or refund on Arc. - circlefin/arc-escrow

GitHub - circlefin/arc-escrow: This sample app demonstrates an end-to-end escrow workflow — from contract creation and deposit, through AI-validated deliverable submission, to fund release or refund on Arc.

Automate escrow-backed freelance agreements with AI-powered work validation using USDC on Arc testnet. This sample application uses Next.js, Supabase, Circle Developer Controlled Wallets, and OpenAI to demonstrate an end-to-end escrow workflow — from contract creation and deposit, through AI-validated deliverable submission, to fund release or refund.

This sample app emonstrates how developers can build the best USDC interoperability UX for wallets using Arc and Gateway. - circlefin/arc-multichain-wallet

GitHub - circlefin/arc-multichain-wallet: This sample app emonstrates how developers can build the best USDC interoperability UX for wallets using Arc and Gateway.

A sample application demonstrating how to build optimal USDC interoperability UX for wallets using Arc and Circle Gateway. This app showcases unified balance management, deposits, and cross-chain transfers across multiple EVM chains using Next.js and Supabase.

This sample app demonstrates how to integrate USDC as a payment method for purchasing credits on Arc. - circlefin/arc-commerce

GitHub - circlefin/arc-commerce: This sample app demonstrates how to integrate USDC as a payment method for purchasing credits on Arc.

Integrate USDC as a payment method for purchasing credits on Arc. This sample application uses Next.js, Supabase, and Circle Developer Controlled Wallets to demonstrate a credit purchase flow with USDC payments on Arc testnet.

This sample app demonstrates stablecoin FX swaps between USDC and EURC using the App Kits Swap SDK on Arc. - circlefin/arc-stablecoin-fx

GitHub - circlefin/arc-stablecoin-fx: This sample app demonstrates stablecoin FX swaps between USDC and EURC using the App Kits Swap SDK on Arc.

Demonstrate stablecoin FX swaps between USDC and EURC on Arc using Circle Developer-Controlled Wallets and Circle App Kit swap capabilities.

This sample app demonstrates DeFi lending by using cirBTC as collateral to borrow USDC on Arc. - circlefin/arc-defi-lend-borrow

GitHub - circlefin/arc-defi-lend-borrow: This sample app demonstrates DeFi lending by using cirBTC as collateral to borrow USDC on Arc.

Explore collateralized DeFi lending on Arc Testnet. Users can deposit cirBTC as collateral, borrow USDC, repay loans, and withdraw collateral.

This sample app demonstrates a decentralized prediction markets platform powered by UMA protocol on Arc. - circlefin/arc-prediction-markets

GitHub - circlefin/arc-prediction-markets: This sample app demonstrates a decentralized prediction markets platform powered by UMA protocol on Arc.

Build decentralized prediction markets on Arc Testnet using UMA's Optimistic Oracle V2, with onchain market creation, YES/NO positions, trading, and decentralized outcome resolution.

An onchain eCommerce demo on Circle Arc that uses the Commerce Payments Protocol (Coinbase x Shopify) as its payment processor. - circlefin/arc-ecommerce-payments

GitHub - circlefin/arc-ecommerce-payments: An onchain eCommerce demo on Circle Arc that uses the Commerce Payments Protocol (Coinbase x Shopify) as its payment processor.

Demonstrate an onchain eCommerce checkout experience on Arc using the Commerce Payments Protocol, with USDC and EURC payments plus authorization, capture, refund, void, and related payment flows.

Share what you've built with these sample apps below!

🚀 Arc Sample App Directory

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