In this episode of Talking Tokens, Jacquelyn Melinek speaks with Erik Reppel, head of engineering at Coinbase Developer Platform and creator of x402., They discuss why the internet struggled without a native payment protocol and why AI agents finally made the problem urgent enough to solve. Erik explains how x402 lets computers send money as easily as they send data, and why Visa, Mastercard, and others are all founding members of its x402 Foundation.

He walks through why the 402 HTTP status code was reserved for "payment required" but left empty for decades, how publishers can now charge AI agents with micropayments instead of losing traffic to scraping, and why agents with wallets are fundamentally more useful than agents without them. The conversation covers why stablecoins are uniquely suited for low-dollar transactions, how Coinbase uses AI internally to make every engineer 3x more productive, and why the best infrastructure eventually becomes invisible.

TIMESTAMPS

(00:00) Intro
(01:25) Why AI becoming an economic actor made the internet's missing payment layer urgent
(03:21) What x402 actually is
(05:14) How x402 works like HTTP but for money and with any client, server, or payment
(06:26) What Erik wants people to build with x402: new business models beyond ads and subscriptions
(08:31) Who is already using x402: CoinGecko, Messari, a16z, and agent native publishers
(09:56) Why the 402 status code sat empty for decades
(11:15) Where x402 stands today: 15+ chains, stablecoins first, credit cards next
(12:50) Why Visa and Mastercard joined the x402 Foundation
(15:41) Biggest use cases right now
(17:16) Are AI agents good traders? Why wallets for payments matter more than wallets for trading
(19:17) What needs to happen for AI agents to participate more meaningfully onchain
(21:44) Do AI agents understand value? Economic reasoning and budget awareness
(23:22) Long-term vision for x402
(26:40) Final advice: play positive sum games with positive people

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