The Arc: Programmable Money Hackathon is a four-week online build sprint run by Circle's Arc team (Arc House) together with Encode Club, where you go from idea to working prototype on Arc, Circle's stablecoin-native Layer 1 where USDC is the gas token. Top teams do not just win and leave. They graduate into an 8-week accelerator, which is the real prize. If you want to become the kind of onchain developer that a young stablecoin ecosystem notices, this is one of the cleanest on-ramps available right now.
What Arc is and who runs it
Arc is Circle's own Layer 1 blockchain, purpose-built for stablecoin finance. The headline design choice is that USDC is the native gas token, so transaction fees are predictable and denominated in dollars rather than a volatile asset. Circle describes Arc as engineered for enterprise-grade, stablecoin-native value movement with sub-second settlement, compliance-ready features, and direct access to Circle's liquidity infrastructure. Circle is the company behind USDC and CCTP, so Arc is not a random new chain. It is the issuer of the second-largest stablecoin building a chain around its own money.
The hackathon itself is a joint effort. Arc House is Circle's builder community arm, and Encode Club is the well-known hackathon and education operator that also runs the surrounding bootcamp and accelerator. The launch event for the current series was scheduled for July 13. Treat that specific date as tied to this cohort. If you are reading later, check the Encode Club programme page for the live cohort, because Circle and Encode run these in waves.
Dates and format
The core structure is consistent and worth internalizing:
- A four-week online hackathon, idea to prototype, fully remote.
- An optional preceding async bootcamp (the "Programmable Money on Arc" track) that teaches Circle's stack before you build.
- An 8-week accelerator for top teams after the hackathon ends.
Encode has also run London workshops and in-person activations at Encode Hub alongside the online programme, so if you are in the UK there may be physical touchpoints. The exact registration deadline and closing date shift per cohort, so confirm them on the official Encode Club listing rather than trusting any single number you read secondhand.
Tracks and prizes
The hackathon runs on two tracks:
- DeFi. Stablecoin-native lending, borrowing, swaps, liquidity, FX, and yield, plus payments, treasury, and fintech infrastructure.
- Agentic Economy. Autonomous AI agents that hold wallets and pay, settle, and transact in USDC with no human in the loop. This is the agentic commerce angle Circle is pushing hard.
On prizes, be careful about numbers floating around. An earlier Arc track at ETHGlobal's HackMoney awarded $10,000 in USDC across three categories, but that was a different event. For this Encode-run Programmable Money series, Circle and Encode had not published a single confirmed public prize-pool figure at the time of writing, and the accelerator placement is positioned as the primary reward. Do not assume a specific dollar amount. Verify the current pool on the official page, and treat the accelerator seat, mentorship, and Circle relationship as the real payoff.
What you actually have to ship
The submission bar is concrete and product-focused, not slide-deck theater. To count, you need:
- A functional MVP with a working frontend and backend deployed on Arc.
- A 3-minute video pitch and demo covering core functionality and your use of Circle tools.
- A link to your public code repository.
The judging emphasis is on real, usable products and meaningful use of Circle's stack over raw complexity.
How to actually win
Winning a Circle hackathon is less about a clever idea and more about depth on their tools. Here is where realistic effort goes.
Use the Circle stack, and use it deeply. The tools judges want to see are Circle Wallets, Smart Contract Platform, CCTP for cross-chain USDC, Gateway, Paymaster, and Nanopayments. A submission that touches three or four of these thoughtfully reads as production intent. One that just deploys a generic contract does not. This is the single biggest differentiator.
Pick a narrow, real payment problem. The strongest Arc submissions solve something that genuinely needs dollar-denominated, sub-second settlement: agent-to-agent commerce, streaming payroll, merchant payouts, micropayment metering, FX corridors. Judges at a payments chain reward payments that work, not DeFi degen loops.
Lean into the agentic angle if you can. Circle is betting on autonomous agents that hold USDC wallets and transact without humans. An agent that pays for API calls, settles invoices, or runs metered commerce on Arc sits exactly where the ecosystem is investing. If you have read up on x402-style machine payments, this is your track.
Ship a demo that runs live. A three-minute video of a working flow beats a polished pitch of vaporware every time. Deploy early, keep the scope tight, and make the demo show a real transaction confirming on Arc.
Do the bootcamp first. The async bootcamp exists so you are not learning Circle's SDKs during the sprint. Builders who arrive already fluent in Wallets and CCTP spend hackathon weeks building instead of debugging setup.
Why building here positions you for what future airdrops look at
Airdrops and ecosystem grants do not reward wallets. They reward provable contribution to an ecosystem, and increasingly the teams handing out rewards look at real onchain history: deployed contracts, meaningful transactions, and a track record inside their stack. A shipped Arc project gives you a public repo, deployed contracts on Circle's chain, and demonstrated fluency in CCTP and Circle Wallets. That is exactly the developer profile a new stablecoin ecosystem wants to keep around.
Arc has not announced a token, and nothing here is a promise of one. But the pattern is consistent across web3: the people who built real things early, and can prove it, are the ones later selection processes actually surface. You are compounding a credential, not buying a lottery ticket.
Build the proof, then let it work for you
The move is simple. Enter a live Arc cohort, do the bootcamp, ship a real payments or agentic-commerce MVP that leans hard on Circle's tools, and keep the repo public. That single project becomes portfolio evidence you are a working onchain developer, not a farmer.
DEPLOYR exists to help you turn that work into a storefront-as-portfolio that ecosystems and grant committees can actually read. Package your Arc build, your contracts, and your shipped demos into a profile that proves the developer behind them. Start at DEPLOYR, plan your next build at /build, and track live opportunities at /hackathons.
One honest line to close on: airdrops are never guaranteed, and no one can promise you a payout. What you can control is becoming the kind of builder the good outcomes tend to find.