Let Consistency and Discipline Win This Time ⏳

Arc Docs Notes, Day 2/30. Today's topic from the @arc docs: which logs does a USDC transfer leave on Arc? USDC movements appear in logs from two sources: - The system emitter logs every explicit USDC movement, with 18 decimals. - The ERC-20 USDC contract logs its own Transfer, with 6 decimals, only for ERC-20 calls. So: - Native send: system log only - ERC-20 transfer(): both logs - Contract call with value: system log only - Mint or burn: both Rules for indexers: 1. Count only one log stream. Filter by emitter address. 2. Never mix 6 and 18 decimals. 3. Gas fees emit no log. Derive them from the receipt. Source: Arc docs, USDC events. Which stream do you index: the system log or the ERC-20 log? Unofficial community note. Not affiliated with or endorsed by Arc or Circle.

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Arc Docs Notes, Day 1/30. Each day for the next 30 days: one new topic from the @arc docs, explained simply. Day 1: Transaction not showing up on Arc? Check your maxFeePerGas first. The docs list a minimum base fee of 20 Gwei. When you send a transaction, you set maxFeePerGas, the most you will pay per unit of gas. If it is below the floor, the transaction is dropped by the mempool silently. That means no receipt and no error, so it can look like the transaction just disappeared. What to check: 1. Set maxFeePerGas to at least 20 Gwei. 2. Gas on Arc is paid in USDC, so the fee is already in dollars. 3. Check the default fee values your library sends (viem, ethers.js or others). Source: Arc docs, EVM compatibility and Fee display. Have you seen a transaction go missing like this? What was the cause? Unofficial community note. Not affiliated with or endorsed by Arc or Circle.

I built LinkPay on @arc and it's now LIVE on Mainnet. Testnet ✅ Mainnet ✅ What is it? Pay anyone with just a link. No copy-pasting long wallet addresses. Create a link, share it on WhatsApp, Telegram or X, and they pay. "Why not just use a normal wallet?" Fair question. Wallets work great if you know addresses. Most people don't. A link is something everyone already understands. Perfect for freelancers, creators and small shops. What's next 👇 🔹 Applying for the Arc grant 🔹 If approved, building my own MetaMask-style wallet with payment links built in 🔹 2 more unique features dropping very soon (can't reveal yet 👀) Try it on Mainnet :- linkpay-lilac.vercel.app/ Please start with small amounts while we're early. Honest feedback welcome @silencexlm @samconnerone @bobbilee