TLDR
- Coinbase’s x402 protocol, co-built with Cloudflare, is now integrated into World’s new AgentKit developer toolkit
- The system lets AI agents carry cryptographic proof they represent a real, verified human
- Coinbase’s Erik Reppel said the goal is for agents to be seen as “legitimate economic participants” rather than suspicious bots
- Coinbase founder Brian Armstrong believes there will soon be more AI agents than humans making online transactions
- In February, Coinbase already launched an AI agent wallet on its Base network for handling automated payments
Coinbase’s x402 protocol is at the center of a new push to fix one of AI’s most pressing problems — how to prove there’s a real person behind an automated agent.
On Tuesday, Sam Altman-backed identity project World launched AgentKit, a developer toolkit built on top of x402, an open protocol that Coinbase and Cloudflare created together. The beta product lets AI agents carry cryptographic proof they’re backed by a verified human.
The x402 protocol works by embedding stablecoin micropayments directly into the web’s communication layer, allowing AI agents and software to transact without a human needing to step in each time.
Erik Reppel, head of engineering at Coinbase Developer Platform and the founder of x402, described the pairing simply: “Payments are the ‘how’ of agentic commerce, but identity is the ‘who.'”
Coinbase’s role here isn’t passive. Reppel said platforms using the system can reject payments that don’t come attached with proof of a human behind them. “As the seller, you can just say, ‘This doesn’t have proof of human attached to it, so I’m going to reject the payment.'”
Why Coinbase Is Building for the Agent Economy
Coinbase founder Brian Armstrong has said he believes “very soon” there will be more AI agents than humans making transactions online.
Binance’s Changpeng Zhao went even further, predicting agents will make one million times more payments than people, “and they will use crypto.”
That backdrop is why Coinbase has been moving fast in the agentic payments space.
In February, the company launched a dedicated wallet for AI agents on its Base network, designed to handle payments while keeping private keys isolated in trusted execution environments.
The x402 protocol is the next layer. Rather than just giving agents a way to pay, it gives platforms a way to verify who — or what — is paying.
The Bot Problem This Solves
Right now, platforms can’t easily tell the difference between a legitimate AI agent working on someone’s behalf and a bot network gaming the system.
DC Builder, a research engineer at the World Foundation, gave a pointed example: “Think of Ticketmaster: if you delegate an agent the ability to book tickets, you can spawn 100,000 tickets.”
AgentKit addresses this by linking multiple AI agents back to a single verified human using zero-knowledge proofs. Platforms can then cap usage at the identity level — one free trial, a daily booking limit — regardless of how many agents are running.
Earlier this month, a federal judge issued a court order blocking AI developer Perplexity’s Comet browser from making purchases on Amazon on behalf of users, showing that the legal pressure around agent-based commerce is already real.
Reppel summed up the problem Coinbase is trying to solve: “What we need are robust, open ways of understanding which is which — being able to tell when you’re talking to an AI, a human, or a specific human’s AI.”
World’s AgentKit currently uses iris-scanning Orb devices for biometric verification, with plans to expand to NFC-enabled passports and government IDs. The network already includes nearly 18 million verified individuals across 160+ countries.
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