Circle Developer

🛠️Build on @Circle with @USDC innovating for an inclusive future | Join our discord for support at

[Circle Developer @BuildOnCircle]

Bridge Kit now supports @Arc Testnet!

Bridge Kit makes it easy to build crosschain experiences with @USDC and CCTP V2 in under ten lines of code:

→ Intuitive SDK methods
→ Built-in monetization support
→ Flexible setup
→ Step-by-step tutorials

Get started with Bridge Kit: https://t.co/BZ25L8VtM5

Learn more about Arc Testnet: https://t.co/FBBxwpIf7u

[Circle Developer @BuildOnCircle]

What does the Dutch East India Company have to do with stablecoins?

More than you’d think.

Benedikt Schuppli of @obligatecom discusses why the infrastructure powering global debt markets is finally being rebuilt, not upgraded.

[HJ Chen @hj_chen]

“Pay first, settle later” with Circle CCTP

Fulfiller pays the recipient instantly on the destination chain, then gets reimbursed later by the platform via CCTP.

Demo running with an agent harness (Arc Testnet → Sepolia)

Clone the repo at https://t.co/rDEPKWmS5m

[Proceeds @apipaywall]

We’re live in beta!

Built an API? Turn it into an agent-ready business.

Proceeds lets you wrap existing endpoints with x402, @mpp, and @circle Nanopayments so agents can discover, pay, and consume your APIs using @USDC in minutes.

🔗 https://t.co/tvANAx0o4x

[Canteen @thecanteenapp]

After some of our builder friends on Canteen began working on the Circle Agent Stack, we wanted to zoom in on how an x402 payment settles - as a companion codebase to circlefin/arc-nanopayments 🧵

[Blessing Adesiji @bleso_a]

I’ve been testing a fast way to turn live X trends into a ready-to-post take.

Here’s the flow:
→ Circle CLI gives the agent a wallet, finds the trend, pays for the data, and drafts the post.

→ Codex computer use opens X and places the draft in the composer so I can review it before posting.

You can also schedule it in Codex to run every morning in your timezone.

[Corey Cooper @corey__cooper]

Just had @circle agent stack due some research on what NBA analysts are saying about Game 7 of the Western Conference Finals and it's amazing how easy it is to gather intel when you can pay with @USDC via x402

[Gordon Liao @gordonliao]

Today we release Circle's post-quantum roadmap. USDC is the most widely used stablecoin across many blockchains. Preparing for post-quantum compute requires a whole of industry approach. Our paper provides guidance for all blockchains aiming to meet institutional requirements.

[Aave @aave]

Aave Labs published a Temp Check to deploy Aave V4 on @arc.

Arc is an L1 built by @circle for digital dollar liquidity and real-world assets.

The deployment would make Aave foundational infrastructure for the institutions using and building on Arc.

[Arc @arc]

Lending infrastructure is building on Arc.

@Aave V4 is exploring coming to Arc, to bring cutting edge liquidity protocol infrastructure to Arc’s stablecoin-native ecosystem.

This would give builders:
→ Familiar onchain liquidity protocol infrastructure
→ Stablecoin-native lending and borrowing flows
→ Featuring Arc’s native asset set at launch, including USDC, EURC, and cirBTC

More to come.

[Arc @arc]

Quantum computing introduces long-term risk for digital infrastructure, from wallet signatures to validator integrity and more.

Circle’s post-quantum whitepaper explores Arc’s phased approach to resilience across:

→ USDC
→ Smart contracts
→ Validators
→ Infrastructure systems

Planning for long-term security and institutional adoption.

https://t.co/Kt8d1aPIKz

[Circle @circle]

USDC is designed to move like the internet: fast, global, and programmable.

Circle Chief Technology and AI Officer Li Fan at SXSW to discuss how onchain infrastructure supports real time, low cost digital currency movement.

[Encode Club @encodeclub]

The @Arc Programmable Money Developer Series is live.

Learn to build on the first L1 where stablecoins are native infrastructure - not an afterthought.

Cross-border payments. Multi-currency apps. Agent-driven finance.

4-week async bootcamp → hackathon → accelerator programme

London-based workshops and activations at Encode Hub throughout!

Bootcamp applications now open ↓

[Jumper @jumperapp]

Cross-chain routes powered by LI.​FI Intents are now live on Jumper.

You can now move @USDC from any supported route to @base near-instantly with near-zero slippage.

Here’s how 👇

[Circle Developer @BuildOnCircle]

Introducing ChainBench, built in collaboration with @OpenZeppelin.

ChainBench is an LLM benchmark for crosschain smart contract generation, testing how model-agent systems write functional and secure contracts across languages, difficulty levels, and development harnesses.

Key finding: frontier models can make strong progress, but security-critical edge cases still matter.
https://t.co/cFaS536PoY

[Allbridge @Allbridge_io]

Why did we choose @circle CCTP as a core pillar for the Allbridge Next architecture?

The answer is simple: robust security and zero price impact (slippage).

Classic liquidity pools work great, but if you are moving whale-sized volumes, the pool balance can be disrupted. CCTP changes the logic entirely: the smart contract officially burns your USDC on the source chain and mints new USDC on the destination chain.

🔹Slippage is always 0%. Whether you transfer $100 or $1,000,000.
🔹Native, secure crosschain transfers.

We took Circle CCTP and seamlessly built it into our interface so you get the ultimate crosschain experience without any extra steps.

[Arc @arc]

Charge $0.001 for an API call.
Let an agent pay for it automatically.
Settle thousands of payments without requiring a separate onchain gas charge for every transaction.

The Arc Nanopayments Starter gives developers a reference implementation for AI agent payments using x402, Circle Gateway, and USDC on Arc Testnet.

Clone it, run the seller app, start the buyer agent, and watch nanopayments happen in real time.

GitHub: https://t.co/N5h5EfqCAd

[Circle Developer @BuildOnCircle]

AI agents need payment systems that can handle thousands of tiny transactions without gas destroying the economics.

That’s what Nanopayments powered by Circle Gateway on Arc are built for.

The Nanopayments Starter shows developers how to build:

→ x402 paywalled API endpoints
→ USDC payments down to $0.000001
→ near-instant offchain verification via Circle Gateway
→ batched onchain settlement on Arc Testnet
→ crosschain withdrawals for seller earnings

Read the guide: https://t.co/oYCXnnTPNn

[Arc @arc]

Arc 🤝 @goldskyio

Goldsky is joining the Arc ecosystem with support from the Arc Builders Fund to offer critical data infrastructure for teams building on Arc.

That means developers on Arc can build with faster, more reliable access to the real-time onchain data their applications depend on.

→ Real-time indexing and data streaming
→ Scalable access to onchain data
→ Capital and ecosystem support through Arc

Arc backs the infrastructure builders need to move faster.

[Circle Developer @BuildOnCircle]

@hj_chen @injective @bguiz 🔨

[Blessing Adesiji @bleso_a]

I gave an AI agent a wallet.

It bought a phone number for 5 USDC, called me with market analysis, and settled the voice call for 0.133 USDC.

The agentic economy is here.