süleyman sandal

Building Common Jar 🫙 — a shared community jar on Arc. One jar, every contribution counts

[süleyman sandal @sleymansandall]

🛠️ Common Jar is still getting built — come take a look.

Since launch I've shipped:

Contract (TipJar.sol):
- tipFor(address beneficiary) — an agent wallet pays the USDC, a different address gets the raffle tickets. An agent can settle a contribution for someone without ever touching their key.
- Architects Jar mode — owner can restrict a round to an allowlist, with an optional ticket multiplier for that round only.
- Reentrancy guard, pausable deposits, on-chain round history, and randomness behind a swappable interface — ready for a verifiable source the moment one exists on Arc.

Frontend:
- Detects Arc Testnet vs Arc mainnet instead of forcing one, no more silent reconnects on refresh.
- Confetti + a one-click "Share on X" when you win a round.
- A runnable agent demo (calls tipFor() on a schedule) and a written x402-style spec for agents that want to pay per-query for jar analytics instead of tipping.

Still 0.01 USDC = 1 ticket, still the whole jar to one winner, still built on Arc — just sturdier and a bit more agent-native every week.

https://t.co/ob9WhdWIZm

Would love for the team to poke at it — @arc @samconnerone @bobbilee @ezgiyaltay. First project on Arc, still not the last.

[Sam | Circle and Arc Dev Community @samconnerone]

Architects!!!!!

I’ve just followed @aeroxyz and think you all should too! Live on day one!!!!!!

Mainnet is not a test!!!!

We are so ready!!!!

[Sam | Circle and Arc Dev Community @samconnerone]

Ok @bobbilee is here!!!

Mainnet 9.16

[Ezgi @ezgiyaltay]

Special week.
Watching institutions, builders, and founders connect in the same rooms - that's the part that stays with you 🤍

[Ezgi @ezgiyaltay]

A new @arc begins…..

[Ezgi @ezgiyaltay]

9.16.26

@arc

[Sam | Circle and Arc Dev Community @samconnerone]

Love this video by @0xemmyeth

[Sam | Circle and Arc Dev Community @samconnerone]

2 Days till mainnet

@arc

[süleyman sandal @sleymansandall]

9.16.26 😎

[Sam | Circle and Arc Dev Community @samconnerone]

9.16.26

@arc

[Sam | Circle and Arc Dev Community @samconnerone]

I still can’t believe we built such a strong community in less than one year.

2 days to Mainnet

[Sam | Circle and Arc Dev Community @samconnerone]

A new @arc begins…..

Mainnet tomorrow.

[Sam | Circle and Arc Dev Community @samconnerone]

9.16.26

@arc

[Arc @arc]

Build on Arc and have a direct path to millions of users.

@MetaMask is the default browser and mobile wallet for Arc, giving builders a familiar wallet connection layer and users a trusted way into Arc’s stablecoin-native ecosystem.

This would give builders:
→ Familiar connect, sign, and asset management flows
→ Easier onboarding into Arc applications from day one

More to come.

[Arc @arc]

Arc 🤝 @fomo

fomo will be live on Arc on day 1.

fomo brings a fast, social-first trading experience to Arc, so everyday users can trade on Arc immediately at launch.

[Arc @arc]

Welcome to Arc 101, Episode 11.

StableFX brings currency conversion onchain through firm RFQ pricing, atomic Payment-versus-Payment settlement, and Maker Netting.

This episode shows how StableFX turns FX into a programmable utility on Arc.

[Arc @arc]

Arc Mainnet.

September 16.

[Arc @arc]

Arc builders in Turkey.

[Arc @arc]

Arc Mainnet launches September 16.

Arc is an open blockchain network being built for the world’s financial markets, real-time money movement, and agentic economic activity.

Arc’s founding validator cohort includes @BlackRock, @The_DTCC, @galaxyhq, @GlobalPayInc, @Mastercard, @MoneyGram, @ICE_Markets, SBI, @StanChart, Sumitomo Corporation, and @Visa.

This is a different model for onchain infrastructure: a network secured by the institutions building on it.

Arc is already gaining traction across major institutions.

@BlackRock, @BNYglobal, @The_DTCC, and @StanChart are each exploring integrations spanning tokenized asset settlement, custody, stablecoin access, FX, and repo infrastructure.

Arc is also expected to launch with a broad ecosystem across liquidity, payments, access, and infrastructure with more to come.

Liquidity / DeFi: @aave, @aeroxyz, @FalconXGlobal, @galaxyhq, @GSR_io, @keyrock, @Morpho, @nonco_otc, @Uniswap, @OfficialXFX

Payments: @raincards, @ThunesPayments, @wirexapp

Major Exchanges and Wallet Providers: @BinanceWallet, @chainlink, @FireblocksHQ, @krakenfx, @Ledger, @MetaMask, @Official_Upbit, @Uniswap

Participants building on Arc experience an open platform powering the world's financial markets, real-time money movement, and agentic economic activity.

Whether you're launching a financial application, integrating stablecoin flows, or experimenting with new, AI-powered economic models, Arc gives you the tools to build what isn’t possible anywhere else.

Arc Mainnet launches September 16.

https://t.co/lUb8kJRp2o

[süleyman sandal @sleymansandall]

🫙 Shipped: Common Jar — a shared community tip jar, built on Arc

Wanted to share what I built and how it works under the hood.

The idea
A communal jar anyone can contribute USDC to. Every 0.01 USDC = 1 raffle entry. When the draw runs, the entire jar balance goes to one randomly selected contributor, then a new round starts.

Smart contract (Solidity ^0.8.24)
- tip() — payable function, tracks per-address totals and mints raffle "tickets" (one per 0.01 USDC)
- drawWinner() — owner-only, selects a winner weighted by ticket count, sends the full balance, resets state for the next round
- getLeaderboard() — returns current-round contributors + amounts on-chain
- Full ownership transfer support (e.g. to a multisig later)
- Randomness derived from blockhash + timestamp — fine for a testnet demo, explicitly not meant to secure real value (would swap in Chainlink VRF for production)

Frontend
Single-file HTML app using ethers.js v6:
- Wallet connect via injected provider (MetaMask), with silent auto-reconnect on return visits
- Read-only public RPC provider so anyone can see live stats (jar balance, entries, round #) without connecting a wallet
- Retry/backoff logic around tx confirmation and stat reads to handle public RPC rate limits gracefully
- Live leaderboard, round tracking, admin-only draw panel for the contract owner

Infra
- Deployed with Foundry (forge create) directly to Arc Testnet
- USDC as native gas token — no separate gas asset to think about
- Hosted on Netlify, fully static, no backend

Live here 👉 https://t.co/ob9WhdWIZm

Built on @arc — first project on it, definitely not the last. @arc @samconnerone @bobbilee @ezgiyaltay

[Arc @arc]

Most chains will address quantum security when they have to.

Arc is being designed with future quantum capabilities in mind from the start.

@gordonliao explains how Arc incorporates quantum-resistant signatures and a mapped path for migrating assets to quantum-safe wallets.