x402 guides
Practical, no-hype guides to machine payments: how to sell over x402 on Base and Solana, how to verify settlements, and the mistakes that bite people. Written from the protocol specs and real Bazaar data.
Accept Solana USDC in your API with x402
Add a Solana USDC rail to your HTTP API with x402: the 402 challenge fields, the ATA gotcha, facilitator tradeoffs, devnet testing, and multi-rail setup.
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Base vs Solana for x402 sellers: an honest comparison
An honest comparison of Base and Solana for x402 API sellers: payment mechanics, verification, facilitators, ecosystem caveats, and why multi-rail wins.
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How to verify a Solana x402 settlement
A step-by-step recipe for verifying Solana x402 settlements: getTransaction params, token balance deltas, mint pinning, commitment levels, and RPC pitfalls.
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Common Solana x402 mistakes (and how to fix them)
Ten common Solana x402 mistakes: missing feePayer, absent USDC ATAs, wrong mints, v1 network names, expired blockhashes, and the exact fix for each one.
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Prefer checking instead of reading? The free x402 Inspector lints any endpoint on either rail in seconds, and the $9 report does the full scored review.