Web3 developers shouldn't be spending weeks writing, auditing, and deploying custom smart contracts just to handle basic corporate operations. Infrastructure should just work. Introducing the ArcFX Developer API—the programmable financial layer for the Arc network. 👇 @circle @BuildOnCircle @arc @jerallaire

Good to see the Arc Testnet v0.7.2 upgrade — transaction memos and batched transactions are both directly relevant to what we're building. For ArcFX, two things stand out: Memos open a cleaner path for invoice reconciliation — attaching a reference directly to a transfer means payment context lives on-chain, not in a separate system. Batched transactions point toward a smoother multisend: combining approval and send into a single step is a real UX win for batch payouts. We're evaluating both as we plan toward mainnet. Building on Arc keeps getting better. @BuildOnCircle @arc @circle @silencexlm @samconnerone

Today we shipped the ArcFX public API and developer documentation on Arc Testnet. Developers can now query ArcFX payment data programmatically: • Self-serve API keys • Invoice payment-status lookups • Payment history (single payments and multisend recipients) • Bearer-token authentication with per-key rate limiting Full API reference with examples is now live, linked from the Developers page. Groundwork for our public API milestone — built on Arc. @arc @circle @BuildOnCircle

Web3 B2B infrastructure lives or dies by security. Spent the day locking down the ArcFX smart contracts: 🛡️ Slither static analysis: Clean. 🧪 Foundry Fuzz tests: 1,000 runs, 0 token dust, batch limits proven. ⛽ Loop gas optimized for 500-wallet payrolls. Pushing for the Circle grant. Let’s build better UX on Arc. 🌐 @arc @BuildOnCircle @samconnerone @circle

What I shipped on ArcFX this week: → Multi-chain bridge (4 chains → Arc) → cirBTC swaps (live same day Circle launched it) → Full transaction history w/ CSV receipts → Rebuilt the trade page from the ground up All on @arc @samconnerone @circle @BuildOnCircle

Shipping on @arc: ArcFX now tracks every payment on-chain in real time. New since last week: → live settlement tracking (auto-ingested via Circle event webhooks) → analytics: volume, payments, who-you-paid breakdown → an authenticated developer API with keys Building in public on testnet 🛠️ @arc @circle @BuildOnCircle @samconnerone

Shipping on @arc: ArcFX just got a unified dashboard and cleaner navigation across the whole app. Non-custodial stablecoin tooling — swap, bridge, multisend, pay links, invoices — all in one place. Gas paid in USDC, no ETH needed. Building in public on testnet 👇 @BuildOnCircle @circle @arc @samconnerone @arc

Shipped the final frontend architecture for ArcFX today 🛠️ Transitioning from a simple DEX to a full B2B infrastructure suite — Invoices, Batch payroll, Pay Links, Address book, API docs — is a massive UX challenge, but the enterprise terminal is finally live on Arc Testnet. What's under the hood: → 6 production tools, 2 deployed smart contracts → Safe / Multi-sig compatible → Circle App Kit CCTP v2 native → 0.15% on-chain fee collecting to treasury → Sub-second settlement, zero ETH required Circle Developer Grant submitted ✅ arcfx.app 🔵 @arc @USDC #CircleGrants @BuildOnCircle

Big week for ArcFX 🔧 Shipped since last update: → Enterprise UI redesign across all 6 tools → ArcFXPayments.sol deployed → Pay Links wired to smart contract → Invoice line items fixed → Bridge step indicators wallet reconnect fixed → Live analytics dashboard tracking swaps, pays & multisends All live on Arc Testnet → arcfx.app #CircleGrants #DeFi @arc

ArcFX now tracks every project building on Arc 🔵 the ecosystem is growing fast: @TowerExchange · DEX AI agent @MorphoLabs · lending on Arc mainnet @arcflowai · stablecoin payments Radius · P2P transfers featured listings available → arcfx.app who else should be on here? 👇@arc

Just shipped a massive update to ArcFX 🔵 here's what's new: ⇄ Swap USDC ↔ EURC — sub-second, no ETH ⇅ Bridge — Ethereum Sepolia ↔ Arc via CCTP 📋 History — all your onchain transactions 💸 Multisend — send to 500 wallets in 1 tx and yes, the multisend contract is live on Arc testnet arcfx.app/multisend 👀 built on @arc · powered by @BuildOnCircle @circle @jerallaire

Just added something to arcfx.app 👀 type any amount and see exactly how much you save vs Wise, Revolut, PayPal, Western Union spoiler: ArcFX wins every time 🔵 arcfx.app → scroll down to "See how much you save"

Just shipped ArcFX — a non-custodial stablecoin FX exchange built on @arc 🔵 Swap USDC ↔ EURC in under 1 second No ETH needed No middleman Live on Arc Testnet Try it now → arcfx.app Built with @circle App Kit 🛠️ #Arc #USDC #DeFi #Stablecoins