Gagan Mac

VP Product @circle, Co-founder | Ex - Product Lead - Ray-Ban Stories @Meta, @Uber, @Twilio

[Circle Developer @BuildOnCircle]

Crosschain swaps are now available in Swap Kit.

@TxnSheng covers how developers can swap tokens across blockchains in one method call, using the same type-safe interface for same-chain and crosschain flows.

Instead of stitching together separate swap, routing, and crosschain transfer logic, builders can use one swap method to define:
→ Source chain
→ Token in / token out
→ Amount
→ Destination chain
→ Recipient wallet

[Gagan Mac @gaganmac]

Cool!

[brryant @bryantchou]

AI is making marketers lazy.

So we made the website do the work instead. Today, we're launching @ployai: the all-in-one marketing platform that turns your website into your hardest working employee.

And we're coming out of stealth today with a $27M seed led by @ycombinator and @firstround.

I spent 12 years at Webflow as the founding CTO where I built the product, but also started our marketing and sales teams that drove our fastest periods of growth. That experience made one thing obvious: the website is the center of your business. And it's only more important in the age of AI.

Foundation model apps can generate assets.
Point solutions can optimize pieces of the funnel.

But nothing runs the whole growth system: your site, brand, CMS, CRM, campaigns, analytics, SEO, AEO, and customer data all working together.

Until now.

Teams at @hex_tech and @clay_run, and growth agencies like Tonik and TNT Growth, are already powering sites on Ploy. Hex is generating on-brand ABM pages at scale, Clay is using its data to power a programmatic SEO engine, and TNT Growth is spinning up a landing page for each of their clients’ ads.

Wake up every morning with a report from Ploy - with what it did, and what it wants to do next.
Approve it. Ship it.
Or be lazy and just watch it cook.

[Y Combinator @ycombinator]

We're excited about the US CLARITY Act.

We think all YC companies will use crypto technology, like stablecoins, before long. Not just crypto startups, not just fintech startups, but every company.

Here's why this law is such a big deal 🧵

https://t.co/39hENfAIZk

[Panchu @Panchu2605]

Circle just designed @Arc to be quantum-resistant from the very first block - and most people building onchain haven't fully processed what that means.

Every wallet, every transaction, every smart contract on every EVM chain today is secured by elliptic curve cryptography. Shor's algorithm, running on a sufficiently powerful quantum computer, breaks all of it.

The threat isn't waiting for Q-Day to start. Harvest-now, decrypt-later is already live. Adversaries collect encrypted onchain data today and hold it until quantum hardware catches up. Every public key ever exposed on any chain is already in that exposure window.

NIST finalized the post-quantum standards in August 2024 - ML-KEM (FIPS 203), ML-DSA (FIPS 204), SLH-DSA (FIPS 205). The industry migration deadline is 2030. The clock is running.

What @circle built into Arc is the only answer that makes architectural sense: quantum-secure signatures live at mainnet launch, from block one. Not retrofitted. Not a future hard fork. ML-DSA, CRYSTALS-Dilithium, Falcon - built in from genesis, opt-in, no forced migration, no network reset.

The rollout covers the full stack. Wallet signatures at launch. Private VM layer next - confidential transfers shielded, public keys wrapped in symmetric encryption. Then infrastructure: TLS 1.3 with X25519MLKEM768 hybrid key exchange, HSMs upgraded. Finally validator authentication - moved only after performance testing confirms sub-second finality holds.

Wrote a full breakdown in the Arc House India chapter - why this architecture matters, what the real tradeoffs are, and why this is directly relevant to anyone building payment infrastructure in India right now.

https://t.co/91QJbhEuop

[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

[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

[Gagan Mac @gaganmac]

@OndoFinance Terrible news. Heartfelt condolences.

[Rachel Mayer @0xrachelita]

iOS didn't replace the phone, it gave every developer on earth the same platform to build on.

Arc does that for money.

[Jeremy Allaire - jerallaire.arc @jerallaire]

This is called @Arc

[Jeremy Allaire - jerallaire.arc @jerallaire]

We just added the ability for your agents sign-up for phone numbers and make AI-native phone calls using Circle Agent Stack and USDC. Get your agent a phone number on Twillio and make AI voice-native real-time calls with BlandAI.

https://t.co/hTGfvyqaWc

[Gagan Mac @gaganmac]

We're working more with startups more deeply than ever before. There's a lot of opportunity emerging to build high-quality financial experiences with global reach using stablecoin infra. Reach out if you think we can help at @BuildOnCircle and @arc

[Y Combinator @ycombinator]

Announcing YC Crypto deals

We're now providing crypto deals to support fintech builders funded by YC: support on tools like wallets, onramps, audits, blockchains, onchain data.

[ace @_ace_won]

The first x402 facilitator on Arc Network is live!

What that means:
→ Any API on Arc can now charge per request in USDC

→ AI agents pay automatically - no human needed

→ Humans can pay too - connect wallet, sign, done

[Jeremy Allaire - jerallaire.arc @jerallaire]

Calling @Arc Architects — I would love to back a team building this with Circle Agent Stack and Arc.

[Morpho 🦋 @Morpho]

Morpho is coming to @arc

Today: $2,500,000,000+ in USDC already earning yield on Morpho.
Soon: the open credit network will power the Economic OS built for the internet-native economy.

[Circle Developer @BuildOnCircle]

Eco integrated Circle Gateway to make multichain execution easier to scale.

Instead of pre-funding USDC on every network, Eco users can work from a unified balance and access liquidity on demand.

For builders, that means less chain-by-chain inventory management and a cleaner base for crosschain deposits, transfers, and swaps.

Learn More: https://t.co/GE205B0qP4

[Rachel Mayer @0xrachelita]

Credit is the fuel for any economy. And day 1 of Arc will have Morpho and more

[Reid Hoffman @reidhoffman]

https://t.co/QLXU6ZOTrj

[Gagan Mac @gaganmac]

It’s *the* programmable dollar.

[Peter Schroeder @peterschroederr]

99.8% of agent transaction volume on x402 is @USDC.

Data: @artemis

[Gagan Mac @gaganmac]

Read more about our plans. Android brought internet to 80% of the world's pockets. With Arc as the economic OS - we want to bring financial opportunities to every corner of the internet.

Arc token delivers the coordination mechanism that keeps us true to this mission.

https://t.co/gwNVRfAMav