Google and Coinbase have joined forces to integrate stablecoin payments into a new open-source protocol for AI-driven transactions, blending blockchain innovation with real-world financial use.
Key Takeaways
- Google launched a new AI payment protocol that supports both traditional payment methods and stablecoins.
- Coinbase partnered with Google to provide stablecoin functionality within the framework.
- The system builds on Google’s Agent2Agent communication platform for AI interactions.
- Over 60 organizations, including Salesforce, American Express, and the Ethereum Foundation, contributed to the initiative.
What Happened?
Google has rolled out an open-source payment system aimed at enabling AI agents to conduct financial transactions using stablecoins and traditional methods like credit cards. The tech giant collaborated with Coinbase and the Ethereum Foundation to develop this system, which builds on an earlier framework designed for AI-to-AI communication. The goal is to ensure AI-driven transactions are seamless, secure, and aligned with human intent.
Announcing Agent Payments Protocol (AP2), an open, shared protocol that provides a common language for secure, compliant transactions between agents and merchants.
— Google Cloud Tech (@GoogleCloudTech) September 16, 2025
AP2 can be used as an extension of the A2A protocol and MCP. Learn how it works ↓ https://t.co/RBFzpU2qUI
Google and Coinbase Bridge AI and Finance
In a significant step toward merging AI with digital finance, Google introduced a protocol that allows AI applications to both send and receive payments. The protocol supports stablecoins such as USDC, offering an alternative to fiat-based payment methods.
To build this capability, Google teamed up with Coinbase, a U.S.-based crypto exchange that has been working on its own AI-powered payment infrastructure. The integration ensures the platforms are fully interoperable and capable of securely processing payments initiated by AI agents.
AI agents can finally pay each other thanks to @googledevs‘ Agentic Payments Protocol (AP2) + x402. 👏
— Coinbase Developer Platform🛡️ (@CoinbaseDev) September 16, 2025
Alongside Google and Lowe’s Innovation Labs, we built a proof-of-concept demo where AI agents can plan a project, build a cart, and pay with stablecoins. 👇 pic.twitter.com/fq3YfjH6Rh
James Tromans, head of Web3 at Google Cloud, told Fortune, “We built this from the ground up to incorporate both legacy and existing payment infrastructure capabilities alongside emerging features like stablecoins.”
Coinbase’s Erik Reppel added that they collaborated closely with Google to ensure compatibility between their platforms, positioning stablecoins as a practical layer for real-world applications.
Built on Agent2Agent Technology
The payment protocol expands Google’s Agent2Agent system, first released in April, which was created to standardize communication between AI-driven agents. These agents are autonomous software entities that can perform tasks such as shopping or searching for financial products without human intervention.
The extension into payments is designed to ensure that AI-to-AI transactions are safe, interoperable, and reflect the user’s intent. The initiative aligns with a broader industry trend where AI systems are expected to communicate and transact directly with each other, reducing human involvement in day-to-day tasks.
Growing Momentum Behind Stablecoins
The announcement comes amid growing momentum in the stablecoin space. According to DefiLlama, the total circulating supply of stablecoins has grown from $205 billion to $289 billion this year. This rise underscores increasing institutional and retail interest in crypto-backed assets tied to fiat currencies.
Regulatory developments like the GENIUS Act in the United States have further fueled adoption, providing a federal framework for stablecoins and legitimizing their use in mainstream financial systems. Market forecasts suggest that stablecoins could reach a $400 billion market cap by 2025 and potentially hit $2 trillion by 2028.
Industry Collaboration Across the Board
Google’s protocol wasn’t built in isolation. Over 60 organizations contributed to the initiative, including American Express, Salesforce, and Etsy, reflecting a comprehensive approach to bridging Web3 technologies with traditional finance. The Ethereum Foundation also participated, reinforcing the credibility and interoperability of the protocol in the blockchain space.
This convergence of AI, crypto, and traditional finance points to a future where software agents act on behalf of users across various ecosystems, handling tasks and transactions with minimal friction.
CoinLaw’s Takeaway
I found this development particularly exciting because it tackles a real friction point in AI and crypto adoption. In my experience, tech platforms often stay siloed, especially when integrating with legacy financial systems. What Google and Coinbase are doing here is ambitious. They’re not just enabling AI to talk to AI but they’re enabling AI to pay like a human. That’s a big deal. If this works at scale, it could mark a pivotal moment where stablecoins become not just a crypto product, but an everyday utility.
