Kartik Bhat
@KartikB101
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Founding Engineer @Sei_Labs // Previously @nvidia , @CarnegieMellon
Joined August 2021
x402 is gaining a lot of traction for Agentic Payments with stablecoins. Here we propose a standard for x402 Facilitator Fee Disclosure
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See you all in Denver next week Talking x402 and Agentic Payments with Stablecoins. Will be sharing what we are cooking here at @Sei_Labs If you're working on agentic payments let's chat 🤝
🎤 We’re excited to welcome @KartikB101, Founding Engineer and AI Lead at @Sei_Labs, as a speaker at ETHDenver 2026. Kartik leads AI efforts at Sei Labs, with prior research experience at CMU, NVIDIA, and DeepMind. Kartik’s participation reminds us that in New BUIDL City,
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Stripe launching x402 Agentic Payments with stablecoins is massive validation A lot of work to be done but couldn't be prouder of how far the ecosystem has come
Autonomous agents are an entirely new category of users to build for, and, increasingly, to sell to. Today, we’re launching (a preview) of machine payments on @stripe—a way for developers to directly charge agents, with a few lines of code. 🤖💸 $ Let’s start tinkering… ⤵️
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We'll be publishing more research on fee-aware routing soon. If you're building on x402 we'd love your input on the proposal. Please also reach out if you want to chat generally on Agentic Payments
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Important: We're NOT standardizing "the best" fee model. Flat fees, bps, tiered, hybrid are all valid. This proposal standardizes disclosure so clients and agents can make informed routing decisions
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Why now? Facilitator fees are turning on: • @CoinbaseDev CDP Facilitator: $0.001/tx after free tier • @thirdweb: 0.3% per transaction Agents can't budget what they can't predict. Without a standard disclosure, clients can't compare costs and each facilitator invents their own
Coinbase x402 Facilitator will introduce a minimal fee starting Jan 1, 2026: → Free Tier: First 1,000 settled payments/month → Pricing: Just $0.001 per settled payment after that The low fee will ensure our ability to continue offering and improving this service. Details 🧵
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Facilitators are x402's gateway layer - they settle payments, enforce limits and verify. x402 v2 is moving toward multi-facilitator routing. That only works if agents can see and compare fees across facilitators
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Why no stablecoins in Google’s new Agentic Universal Commerce Protocol? Stablecoins only make sense for high frequency, low value micro payments settled instantly (APIs). x402 will dominate here Shopping-like use cases are higher value (“macro” payments), lower frequency, and
AI agents will be a big part of how we shop in the not-so-distant future. To help lay the groundwork, we partnered with Shopify, Etsy, Wayfair, Target and Walmart to create the Universal Commerce Protocol, a new open standard for agents and systems to talk to each other across
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Cloudfare talking x402
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Tailwind drama showing exactly why we need pay-per-use + micropayments for AI crawlers. Usage is exploding (agents), but docs traffic is ~40% down and revenue ~80% down - they cut ~75% of eng. Internet business model is shifting to agents. One thing x402 aims to solve
🎧 Recorded a new morning walk this morning, hard one to share because I'm sure people will want to roast me for it but have been transparent up until now so publishing it anyways.
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SDF recently hosted a fundraiser for Congressman @RitchieTorres’ re-election as we back pro-crypto leadership in the U.S. Ritchie has been central to pro-crypto policy: he founded the Congressional Crypto Caucus, championed GENIUS & co-sponsored CLARITY. Aligned on Progress 🇺🇸
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12 days. 12 livestreams. A bunch of new things, big and small. 12 Days of OpenAI starts tomorrow.
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IMPACT SUCCESS! Watch from #DARTMIssion’s DRACO Camera, as the vending machine-sized spacecraft successfully collides with asteroid Dimorphos, which is the size of a football stadium and poses no threat to Earth.
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Giant news from a giant planet! @NASAWebb captured a new view of Jupiter in infrared light, uncovering clues to the planet’s inner life. Two moons, rings, and distant galaxies are visible. Get the details: https://t.co/6WKbAQY78z
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What a view
It's here–the deepest, sharpest infrared view of the universe to date: Webb's First Deep Field. Previewed by @POTUS on July 11, it shows galaxies once invisible to us. The full set of @NASAWebb's first full-color images & data will be revealed July 12: https://t.co/63zxpNDi4I
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