₿ The Book of ₿itcoin
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Money for AI agents: spend, save, and Lightning


Bitcoin is the base. The interesting question is what gets built on it, and AI agents are the newest test. AI agents can read, plan and call tools. The next question is how they pay. The honest picture so far: dollars and stablecoins for everyday spending, Bitcoin as the coin you keep, and Lightning for tiny instant payments. These guides follow the real protocols and documents and say what is confirmed and what is hype.

Start with the first guide below, then read in any order. These guides are drafted by an AI assistant from primary sources and checked before publication. How we verify. Nothing here is investment advice.

How to use this guide

Read the first card to get the plain-words overview, then jump to whatever you need. Every article ends with its sources, and anything we could not confirm is marked as unconfirmed instead of guessed. If a word is new to you, the Glossary gives a short definition with a source.

What these guides do not do

They do not predict prices, recommend products, or tell you what to buy or sell. Opinions are kept in a box labelled “Our take (opinion, not fact)”, so you can always tell facts and opinions apart. New guides are added as new Field Notes are published.

The guides

Can AI Agents Pay With Bitcoin? Short Answer: They'd Rather Use DollarsAI helpers are getting wallets. Three new tools decide how they pay: two cash registers and one permission slip. What each does, i138 Million Robot Payments, and Why Nobody Is Cheering YetA research firm counted 138 million payments made by AI helpers on one network. Most were pennies. What the report says, what it dStablecoins and the GENIUS Act: What the Law SaysThe US passed a stablecoin law in July 2025. Here is what it says in plain words, what we could not verify, and why it matters forWhat Is a Stablecoin, and Who Backs It?A stablecoin is a digital promise. Primary documents explain who owes the money, what reserves support it, and why backing is no gWhy a Robot's Shopping Wallet Might Use DollarsDollar budgets help explain stablecoin checkout. Compare spending, saving and tiny Bitcoin payments without crowning a winner.
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