Coinbase Links AI to Crypto Payments With New Protocol for Autonomous Transactions

Coinbase is linking artificial intelligence directly to crypto payments with a new system built on the Model Context Protocol that lets AI agents hold wallets, send stablecoin payments, and interact with online services.

The launch of Payments MCP connects AI to on-chain value transfer at scale, giving machines the ability to transact autonomously through a standardized protocol.

Payments MCP builds on x402, Coinbase’s open payment standard based on the long-unused “HTTP 402: Payment Required” code. It works with Anthropic’s Claude (Desktop and Code), Google’s Gemini, OpenAI’s Codex, and Cherry Studio, allowing agents to create wallets, onramp funds, and send stablecoin payments directly from a prompt.

“Crypto is uniquely suited to machines,” Erik Reppel, Coinbase’s head of engineering for its developer platform, told Decrypt. “It is the only open, digital-native standard for payment that any program can use.”

The Origins of x402

Reppel said the naming of x402 was intentional and rooted in a long-running effort to build an internet-native payment standard.

“People have been trying to create an internet-native payment standard since the ’90s,” he said. “Marc Andreessen and the team at Netscape explored it while navigating credit card systems and trying to build true internet payments.”

When HTTPS arrived, Reppel explained, people finally felt safe sending credit cards online, and payments modernized. Still, a standard has yet to emerge. Every merchant handles card data differently; the forms look similar, but the processes between computers are always unique.

“AI agents are just smarter programs, and they work best with programmatic interfaces instead of human-optimized systems,” Reppel said. “Now, with AI agents needing to exchange value programmatically, we finally have the tailwinds to make an open standard possible—a technology ten times better and more accessible than before.”

Experimenting with Agentic Commerce

Coinbase says Payments MCP makes it simple for users to experiment with AI-driven transactions without writing code.

A built-in interface lets users create and fund wallets with only an email address—no developer setup or API keys required. Through the x402 Bazaar Explorer, agents can browse APIs and services they can pay for directly inside the app. At the same time, an integrated onramp and guest checkout let them begin transacting almost instantly in supported regions.

Users can also set spending limits and manage approvals through an easy configuration panel. For privacy and speed, the system runs locally. Coinbase describes it as a bridge between developer tools and mainstream use, making “agentic commerce” accessible beyond the coding crowd.

The initial release integrates with Claude, Gemini, Codex, and Cherry Studio. ChatGPT isn’t included because the current transport method used by Payments MCP is incompatible with the streaming variant that OpenAI’s chat product currently uses; however, support is planned for the future.

Guardrails and compliance

Each agent wallet has configurable funding limits, approval thresholds, and session caps.

“The quality of safeguards depends on how programmable the money is,” Reppel said. “With Payments MCP, you can set limits for your agent. They have dedicated funds you explicitly give them—they don’t have access to your main wallet. It’s impossible for an agent to rack up a credit card bill you’re responsible for.”

He added that developers can build rules engines on top of x402 to manage permissions. “You could, for example, let an agent spend up to ten cents freely, but require approval for anything higher. It’s all about what the tools and technology allow developers to build in.”

Reppel said Coinbase’s compliance framework mirrors its technical safeguards, with checks built into every layer of the system.

“Coinbase follows all relevant KYC regulations at the points where users enter or exit the system,” he said. “We handle this under the hood so it doesn’t affect the user experience. That’s part of the value of using CDP tools—we build as much compliance as possible directly into the products.”

An open standard

Coinbase and Cloudflare are backing the x402 Foundation to maintain the protocol as company-neutral infrastructure.

“Companies want to build on open protocols that remain usable whether or not Coinbase exists in two years,” Reppel said.

Reppel predicts 2026 will be the “year of agentic payments,” where AI systems programmatically buy services like compute and data.

“Most people will not even know they are using crypto,” he said. “They will see an AI balance go down five dollars, and the payment settles instantly with stablecoins behind the scenes.”