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Add 2026-05-24 learning notes: Machine Payment #39

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Expand Up @@ -15,6 +15,23 @@ AI x Web3 School
## Notes

<!-- Content_START -->
# 2026-05-24
<!-- DAILY_CHECKIN_2026-05-24_START -->
今日學習：深讀 Machine Payment 模組（Stablecoin Payment / Budget / Quote / Payment Intent / x402 / MPP / Subscription / Micropayment）

GitHub 筆記：https://github.com/roy328line/ai-web3-school-cohort-0/blob/main/daily/2026-05-24.md

Machine Payment 核心整理：

第一性原理：Agent 不應該擁有無限支付能力，只應該拿到具體任務、預算和收款方範圍內的支付權限。支付能力 = 執行能力，一旦 Agent 可以付款，它就可以消耗用戶資金或被惡意上下文誘導。

三個核心原則：預算先於執行（沒有預算邊界 = 沒有安全自動支付）、報價必須可比較（Agent 需知道價格/幣種/有效期/退款條件）、收據必須可驗證（付款後能證明付給誰/為什麼付/交付了什麼）。

關鍵知識點：x402 把 HTTP 402 Payment Required 變成互聯網原生支付流程，讓 Agent 處理 402（付款）就像處理 401（登錄）一樣自然。MPP 協議化機器間支付流程：服務發現 → 報價 → 授權 → 結算 → 收據。Micropayment 不適合每次都上鏈結算（成本超過服務本身），需要 L2 / payment channel / 批量結算設計。

個人洞察：機器支付不是技術問題，而是信任問題。Builder 機會：「Agent 可以信任、用戶可以控制、服務方可以驗證」的支付基礎設施。
<!-- DAILY_CHECKIN_2026-05-24_END -->

# 2026-05-18
<!-- DAILY_CHECKIN_2026-05-18_START -->
今日學習：深讀 AI x Web3 School Handbook 模組 A（LLM / Prompt / Context / Agent）+ 模組 B（Wallet / Smart Contract / Account Abstraction）
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