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Joining hosts Simon Taylor and Cuy Sheffield this week are Raj Parekh, Head of Stablecoins and Payments at the Monad Foundation, and Liam Horne, Product at Tempo - who previously built Optimism and is a decade-long veteran of scalable blockchain payments infrastructure.

Stripe, Tempo, and Visa shipped a payment protocol for AI agents this week - and Visa employees are already using their personal cards to buy image generation from the command line. That's not a roadmap item. It's live.

🎙️Listen to the full episode here on your favorite podcast app or 📷 watch on YouTube.

MPP: The Headless Checkout for Agents

The biggest story this week was the launch of Machine Payments Protocol, co-developed by Stripe and Tempo with support from Visa. As Liam Horne explained, "there's not really a good, low-level primitive that's payment rail agnostic that's out there right now." MPP is designed to fix that - a protocol neutral enough for IETF-style adoption that works across cards, stablecoins, and any blockchain.

Cuy Sheffield framed the design principle clearly: "The only way agentic commerce is going to scale is if it's payment method agnostic, if it's payment network agnostic, if it's PSP agnostic." Visa's team had engineers in the office over the weekend adapting the spec, and Sheffield is now making live card transactions from Claude Code via what they're calling Visa CLI.

The developer response has been telling. As Sheffield noted, "Vibe coders who use Claude Code... they're like, yes. Thank you. I need this. I hate leaving the command line." The concept of "command line commerce" - paying for services without leaving an agentic workflow - is resonating hard with a specific, fast-growing segment.

And it's not just crypto natives leaning in. As Raj Parekh observed from the ground in San Francisco: "When you're actually going to some of these meetups and these hackathons, you actually don't see crypto devs. You actually see a lot of AI web two devs... I haven't seen AI devs fear this at all because it's crypto. I think they have actually embraced it because of what they can do with it."

One of MPP's more interesting features is "sessions" - essentially payment channels reborn for the agentic era. As Horne described it, "It's kind of like a tab at a bar." You lock up funds, make hundreds of instant micro payments within a session, and settle once at the end. The use case: paying per LLM token at fractions of a cent without hitting the chain for every interaction.

Tempo Mainnet: Third-Generation Infrastructure Goes Live

Tempo's mainnet launched after just seven months of development, though Horne is quick to note the underlying client - Reth - has been battle-tested across Ethereum for years. The chain introduces stablecoin-specific primitives: a native TIP-20 token standard (rather than ERC-20 as a smart contract layer), separated fee structures for payments, native FX exchange, and codified compliance features like whitelists, blacklists, and account-level admin controls.

As Horne put it: "From the blockchain point of view, it can sometimes seem a little bit boring... but from the financial infrastructure world, these are obvious things you need."

Raj Parekh offered the view from the Monad side: "The bottlenecks no longer exist. The EVM is now perfected." Third-generation chains like Tempo and Monad are expanding the addressable market well beyond crypto-native use cases.

Horne also teased what's next: privacy. The team is working on a solution that threads the needle between overly complex cryptographic approaches and private-database-as-a-blockchain offerings - "still fully permissionless, still fully self-custodial, but you get the benefits of what that directional thing of the private blockchain was supposed to be without losing interoperability." More details coming soon.

MasterCard Acquires BVNK: The $1.8B Validation

MasterCard's acquisition of stablecoin orchestration provider BVNK - processing $30 billion annually across 130+ companies - came with a pointed statement from MasterCard's CPO: "We expect most financial institutions in time will provide digital currency services as a default."

Sheffield noted that "every bank needs a stablecoin strategy" has become so obvious he's stopped saying it. The conversation has moved on to execution: which use cases to prioritize, how to manage risk and compliance, and how to actually build.

Stop Studying, Start Building

The clearest signal from this episode is that the window for passive observation is closing. Liam Horne, fresh from six months of enterprise conversations, offered a candid read: "A lot of them are seeing this world that is opening up to them, and they're just like, where do I even start? There's so much complexity, and there's so many people telling me different stories." His advice is direct - keep it simple, meet institutions in their language, and encourage them to get hands-on personally with the tools.

Looking Ahead: The AI Mullet

Sheffield introduced a new framework worth watching: "the AI mullet - cards in the front, stablecoins in the back." The idea is that consumers pay with familiar card rails while merchants receive instant stablecoin settlement on the backend - solving the GPU-bill problem for AI service providers who can't afford to wait three days for funds to clear during hyper-growth.

Raj Parekh's closing advice to financial institutions still on the sidelines: "If you're not building in it... from all the series of announcements that have taken place, this should hopefully be the wake-up call. Get in gear. Get your Claude Code going, get your wallet going. Play with Tempo, play with Monad... this thing's not slowing down anytime soon."

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