Archive
A complete index of every Field Note published on x402 Review — in reverse chronological order, newest first.
2026
Field Note #3: Onchain Trigger Endpoints
What if a smart contract could pay $0.001 for an external API call only when it needs one?
Smart contracts are intentionally blind — the EVM cannot make HTTP requests. This note explores the economics of pay-as-you-go oracles, the latency floor of onchain settlement, and whether $0.001 per call makes Chainlink-style feeds obsolete for low-frequency triggers.
Published 21 July 2026 · Tags: Base L2, blockchain, Chainlink, HTTP 402, oracles, protocol-economics, smart-contracts
Field Note #2: IoT Sensor Streams
What if you could buy a single sensor reading for a tenth of a cent?
This note examines the unit economics of sub-cent sensor data, the aggregation problem, and whether the latency of onchain settlement can keep up with real-time sensor polling.
Published 21 July 2026 · Tags: Base L2, data-marketplace, HTTP 402, IoT, sensors, protocol-economics
Field Note #1: Anti-Spam Email Proofs
What if every email cost a tenth of a cent?
This note explores the economics of staked delivery, the UX of per-message payment prompts in existing mail clients, and whether $0.001 is the right price floor to kill spam without killing the inbox.
Published 21 July 2026 · Tags: anti-spam, email, HTTP 402, reputation-bonds, protocol-economics
x402 Review 