Concepts
How AI agents pay for APIs: wallets, signatures and facilitators
How AI agents pay for APIs with x402: the wallet, the EIP-3009 signature and the facilitator explained step by step, with client code and the safety limits.
· 7 min read
Articles on x402 and AI agent payments
How to charge AI agents for an API with HTTP 402, written for the developers doing it: setup guides for Laravel and Node, testing without real money, pricing, and what to do when payments fail.
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Concepts
What HTTP 402 Payment Required means and how x402 uses it
What the HTTP 402 Payment Required status code means, why it sat unused for decades, what a 402 looks like with x402 today, and how clients should handle one.
· 8 min read
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Concepts · Production
What x402 facilitators do and how to choose one
What an x402 facilitator does at each step of a payment, what it can never do with your money, and how to choose one for testnet, mainnet or self-hosting.
· 8 min read
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Strategy · Concepts
x402 vs API keys and subscriptions: when pay-per-request makes sense
x402 vs API keys and subscriptions, compared fairly: where pay-per-request wins, where keys and plans are better, and how to run both on one Laravel API.
· 6 min read
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