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Guides on x402 payments and the paperwork behind them. For the people who build agents, and for the people who book what those agents spend.
Preview. These articles are drafts and not published yet.
x402 · DraftHow x402 works: a paid API call, header by headerWhat an x402 server sends back, what your agent signs, who pays the gas and what ends up on Base. Walked through with a real 402 answer from CoinGecko.6 min readRead the guideAccounting · DraftHow to book x402 payments: USDC, exchange rates and receiptsYour agent paid in USDC, your books are in euros. What each payment needs, which rate to use, the two booking lines and the documents to keep.6 min readTax · DraftVAT on x402 payments: reverse charge when your agent buys abroadWhere VAT is due when an EU company's agent pays a foreign API in USDC, who reports it, which document you need and which boxes it goes in.5 min readRegister · DraftWho is behind this wallet? How to check an x402 sellerAn x402 payment goes to an address, not to a company. How to tie a payTo wallet to a domain and a legal entity, and why your books need it.5 min readx402 · Draftx402, MPP, AP2 and ACP: four agent payment protocols comparedTwo of them move money per request, one proves what a user allowed, one runs a checkout. What each does, who is behind it and what it leaves for your books.5 min read
Agents pay. We write the paperwork.
A receipt for every x402 payment, one document per seller and month, and a register that says who is behind a wallet.