Carson Roscoe

Senior Software Engineer @ Coinbase
Working on AgentKit & x402

[yuga.eth 🛡 @yugacohler]

I'll be at @ETHConf tomorrow, speaking on agentic payments, x402, and more! With my friend and former boss @programmer.

I'll be around all day, so please reach out if you want to chat.

[yuga.eth 🛡 @yugacohler]

The best place to develop your x402-enabled agent, hands down, is @CoinbaseDev.

- Wallets with configurable custody; API-key driven or end-user driven
- On/offramps built-in
- Native x402 facilitator to make payments trivial

If you're using x402, build with CDP! Link in 🧵

[Coinbase Developer Platform🛡️ @CoinbaseDev]

It's been another BIG week for x402 and payments:

x402:
→ Batch settlement is now generally available on the Coinbase x402 Facilitator.

→ @base MCP's launch presented a new way to access x402 plus ecosystem projects.

→ @Visa onboarded x402 endpoints into the Visa CLI.

→ @tavilyai integrated x402. Real-time web search, agent-payable in USDC on @base, no API key or account needed.

→ Claude agent built by @Must_be_Ash reads the day's news for $0.10, built with x402 and @tavilyai.

Partnerships:
→ @PPRO_Payments integrates Coinbase Payments, bringing stablecoin acceptance to enterprise merchants.

Events:
→ Join us at @money2020 in Amsterdam next week:

Panel 1 with Alaina Revoir: "Unlocking Value: Digital Assets in Institutional Payments," Tuesday June 2, 11:10, Intersection Stage.

Panel 2 with @0xceaneCodjia: "The Big Debate: AI Agents, Consent, and Innovation in Payments," Wednesday June 3, 17:25, Intersection Stage.

→ At @ethconf in NYC June 8-10, catch:

@GainsleyJustin speaking on stablecoin payments.

@yugacohler & @programmer speaking on agentic payments.

[erik.eth 🛡 @programmer]

Update: I’ve left Coinbase. I’m starting a company.

I’ll continue to be involved with x402 as a member of the Technical Steering Committee with the foundation, and as an advisor to Coinbase on agentic commerce.

I’m incredibly proud of the work we’ve done in @CoinbaseDev. It's truly an elite team executing at the highest of levels. Many exciting things coming soon 👀. @yugacohler will be taking the helm as Head of Engineering, he’s a rockstar, he’ll crush it.

It's been an exceptional second tour of duty at Coinbase. It was a hard decision to leave, but there's an idea in my head I need to get into the world.

Big thank you to @barmstrong, @emiliemc and @nemild for bringing me back, and to @alecglovett, @yuga @brian__foster and everyone else in CDP - it's been an honour.

[Amanda McDermott @flyingkittans]

Just a table of sharks from @CoinbaseDev and @AWSstartups.

Congrats to the @easya_app hackathon winners at @consensus2026! Fantastic entries all around.

[lincoln.base.eth @MurrLincoln]

AWS 🤝 x402 & Coinbase

what makes me optimistic that agentic payments are here to stay is how quickly some of the biggest companies in the world are jumping onboard.

[Coinbase 🛡️ @coinbase]

Every agent deserves a wallet.

So we’re helping every dev on Amazon Bedrock AgentCore give their agents one.

Autonomous spending, budget controls, built-in compliance, and USDC settlement on @base.

This is the future, powered by x402.

[jnix.base.eth @Jnix2007]

Incredible to see all the recent improvements to the x402 protocol 🤯

- Algorand SDK
- Hedera SDK
- Go middleware (Echo + net/http)
- Fastify middleware
- UpTo in Python
- Bazaar search

Most of these were community-driven, which is why open protocols win 🧵

[erik.eth 🛡 @programmer]

Come listen to me yap

[Coinbase 🛡️ @coinbase]

x402.

[jnix.base.eth @Jnix2007]

The storefront of the agentic economy is live 🔥

A streamlined and snappy web UI for humans, and a rich MCP for agents to find x402-enabled products. Check it out!

[Ash @Must_be_Ash]

x402 Bazaar v2

> Semantic Search: just describe what you need
> Filters: narrow results by price, asset, chain
> Quality Signals: think PageRank for APIs

> MCP with proxy_tool_call: search in natural language, call any service as a tool. No need to know how the endpoint works.

[Brian Armstrong @brian_armstrong]

Big scalability improvement for agentic payments: x402 "Upto".

Pre-authorize up to an amount, use as much as you want, the final amount gets settled onchain.

[lincoln.base.eth @MurrLincoln]

If you zoom in you’ll notice this is the first x402 billboard

[Youssef @0xyoussea]

A new way to bill AI agents just dropped: the x402 upto scheme 🤖💸

x402 is the HTTP 402 standard for machine-to-machine payments. Until now, it only supported fixed pay-per-request pricing.

Here is why the new `upto` scheme changes everything 🧵👇

[Coinbase Developer Platform🛡️ @CoinbaseDev]

Usage-based pricing is now live on x402!

The new "Upto" scheme lets agents pay only for what they consume, unlocking variable-cost services like LLM inference, compute, and data queries on x402.

Available now on the x402 SDK + CDP Facilitator. ↓

[The Linux Foundation @linuxfoundation]

Today, the Linux Foundation announced it is launching the x402 Foundation with the contribution of the x402 protocol from Coinbase. As the neutral home for x402, the Foundation will advance the x402 protocol and help enable community-based innovation in open payments.

Read more here: https://t.co/E42CQ4JjPi

[erik.eth 🛡 @programmer]

Happy 4/02
Open standards need open governance

[jnix.base.eth @Jnix2007]

Three big launches on x402 today:

- Pay with any ERC20 token via Permit2
- Prove "I already paid" via SIWx enabling sessions, subscriptions etc
- Easily monetize MCPs on x402 🔥

[Coinbase Developer Platform🛡️ @CoinbaseDev]

x402 now supports ANY ERC-20 tokens.

Developers can accept payments using:
→ EIP-3009 (Transfer with Authorization)
→ Permit2

That means tokens like USDC, EURC, or any ERC-20 token via Permit2 (yes, even your fav memecoin) can now be used for onchain payments with x402.

Docs:
https://t.co/ZymCx0mlSB