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AI · May 8, 2025

x402

An open protocol for internet-native payments from Coinbase

Visit site ↗Alternativestop 16% of May 2025

What it does

x402 revives the original “HTTP 402 Payment Required” status code to allow bots, agents, and apps to pay-per-call using stablecoins—no API keys, no human-in-the-loop setup required. Make any API or MCP server accessible to agents without human config.

Does the same job

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  • XA
    X402 – an open standard for internet native payments2025 · x402.org · ▲16

    Hi HN – excited to announce x402, initially developed by Coinbase (YC 12) x402 lets any HTTP API charge per request without issuing API keys or storing credit cards. Buyers (humans or AI agents) keep funds in their own wallet and dynamically discover compatible endpoints, call them as usual, and automatically pay a microtransaction in USDC or other tokens to settle. 90 second demo: https://www.youtube.com/watch?v=PV-L2AfLhJg Problem: Every time we want to use a new API we have to: find the service online create a developer account, copy a secret key into env vars, pre-fund or…

  • L402.org2024 · ▲122

    Internet-native paywalls with HTTP 402 status code

  • P402.ioJan 2026 · ▲102

    Route, verify, and settle paid API calls with clear traces

  • x402statsAug 2026 · x402stats.io · ▲3

    Independent x402 stats: organic volume, wash-trades removed

  • x402 wallet API: 9 Base endpoints, USDCAug 2026 · api.kachangsia.com · ▲1

    9 Base endpoints for AI agents, paid in USDC per call

  • x402r Refund ProtocolMar 2026 · ▲2

    Refund & Arbitration Protocol For Agents

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