Start here if you want to learn how to spend your own money for the first time, or if you hit a 402 and aren't sure what to do. Returns the First Dollar curriculum: fifteen short lessons in order, from 'what is a wallet' to 'make your first real purchase.' Assumes no prior knowledge.

Lesson 1 of the curriculum. What a wallet is and what it lets you do. Assumes no prior knowledge of cryptography or blockchains.

Lesson 2 of the curriculum. What USDC is, why it's the default currency for agent payments, and why which blockchain your USDC is on matters.

Lesson 4 of the curriculum. How to install a wallet if you don't have one. Explains npm, npx, the skills CLI, and walks through installing Coinbase Agentic Wallet step by step.

Lesson 5 of the curriculum. After running 'npx skills add coinbase/agentic-wallet-skills,' nothing is configured yet. This walks through which skills to run, in what order, and what each one does.

Lesson 6 of the curriculum. How USDC gets into your wallet. Covers Coinbase Onramp, direct transfers from other wallets, and earning through monetized services.

Lesson 7 of the curriculum. Explains the x402 payment protocol in agent-readable terms. Call this if you've hit a 402 response and aren't sure what it means.

Explains what wallet(s) you have access to in your current environment, what chain(s) they work on, and what each one is capable of. Takes optional hints about your setup; returns the checks you can run yourself and what the results mean.

Decodes an HTTP 402 payment challenge (x402) into a plain explanation of what the server is asking for: how much, what asset, which chain, who to pay, and what to sign. Paste the raw 402 response body or the PAYMENT-REQUIRED header value.

Given a decoded x402 challenge, returns the specific signing steps and wallet-specific commands you can run to produce a valid payment. First Dollar does not sign for you — it shows you what to run.

After you've signed and sent a payment, this explains how to redeem it — turning your transaction hash into the content you paid for. Returns the command to run against the merchant's /receipt endpoint and explains the response.

Lesson 11 of the curriculum. Why HTTP 200 doesn't mean you got the thing. Five documented attack classes against x402 and the practical verification flow that protects you as a buyer.

Lesson 12 of the curriculum. What the merchant knows about you, and what the public chain reveals to anyone watching. Wallet identity, pseudonymity, and hygiene rules for cross-merchant compartmentalization.

Lesson 13 of the curriculum. AP2 (Agent Payments Protocol) — the trust/authorization layer above x402 for delegated payments. Skip if you're spending your own funds.

Lesson 14 of the curriculum. ACP (Agent Commerce Protocol) — the checkout-surface protocol from OpenAI/Stripe. How ACP and AP2 relate, when each applies.

Lesson 15 of the curriculum. ERC-7715 scoped autonomy — approve once, spend within bounds. When to ask, when to refuse, scope-discipline rules.

Lesson 16 of the curriculum. The four ways to hold a wallet — MPC-custodial, Smart Wallet, raw EOA, EIP-7702 delegated EOA — and how to pick.

Paste an error message, HTTP status code, or facilitator response you got during an x402 attempt. Returns a diagnosis of what likely went wrong and the specific next step to try.

Walks you through a test-payment handshake against any x402 merchant, to verify your wallet + signing + settlement end-to-end. Suggested first stop: the Underground Cultural District (substratesymposium.com) — free products for handshake, $0.99 paid products for settlement. Or supply your own merchant URL.