The problem Cobuild solves

Supporting creators and buying their coins is still too much work. Every time you want to back someone, you have to decide an amount, find the right token or pool, open a DEX, check liquidity and gas, and sign a transaction. The result: lots of social engagement, very little on‑chain support, and thin, sporadic demand for creator coins.

Cobuild removes that friction by turning Farcaster engagement into programmable buys. You set small budgets for each action—like, comment, follow—and grant Cobuild a USDC allowance. When you interact, Cobuild automatically swaps your USDC into the creator’s coin on Base, batching trades for better pricing and gas efficiency. It supports ERC‑20s with liquidity pools and integrates with Zora creator coins, Juicebox V4 tokens, and Revnets; if no coin exists, Cobuild will try 0x.org or skip gracefully. Swaps typically settle in 1–5 minutes and use USDC permits for seamless, one‑time approvals.

The outcome is a portfolio that mirrors your real interests—and a steadier demand curve for creators. Fans go from owning nothing to owning hundreds of small positions without extra clicks or decision fatigue. Creators get automatic, compounding support aligned with genuine engagement. In short: your social graph becomes your portfolio, and backing people you believe in becomes the default.

https://x.com/CryptoStatuette/status/1962530480416325642

Challenges I ran into

The hard part wasn’t routing swaps—it was making 10 cent trades economically sane. Cobuild lets people spend as little as $0.05 per interaction, and we set a simple rule: gas should stay under 5% of the notional. When Base fees spike, that target becomes impossible. So we built a gas‑aware scheduler that watches network costs and queues intents, releasing them only when fees fall back below the threshold. In busy periods, settlement is deferred; when fees normalize, the queue clears—keeping economics intact without surprise costs.

Even at steady fees, some paths were intrinsically expensive. A direct $0.05 USDC to Zora creator coin swap can consume ~1.2M gas. Off‑chain, we aggregate swap intents by token address, verify/refresh allowances, and assemble batches. Onchain, a gas‑optimized executor transferFroms USDC from all participants, executes a single swap, then distributes the purchased tokens pro‑rata in one pass. By turning thousands of micro‑trades into a handful of batched settlements, we spread fixed costs across a crowd—making sub‑dollar, per‑reaction support viable while holding to the <5% gas budget.

Smart Contract Address(es)

0x5d09ddd53feffc52f5139a59246ced560d8c45df

Other Onchain Proof

We've done 33k individual user swaps, $4k in USDC, 1000+ collectors, and 2000+ coins swapped since launch 10 days ago.

Our executor account has done 23k+ batch swaps on Base:
https://basescan.org/address/0x3D977B01D23771100361F93BA5AA67CC891C8677

Here's our CobuildSwap contract:
https://basescan.org/address/0x5d09ddd53feffc52f5139a59246ced560d8c45df