Observed arrival · 2026-08-25

fx402, the Coding Agent That Asks Before Paying

fx402.dev Observed source

Editorial interest 78/100 Selection signal · not a rating of the site

A fork of the tiny native coding agent fx that discovers paid APIs and pays for approved requests in USDC on Base.

Landing page captured for the 2026-08-25 issue.

Field notes

The command-line workflow exposes discovery, schema and price checking, balance inspection, and payment-backed fetching as separate tools. The example uses twit.sh, shows a 0.005 USDC request on Base, and ends with a paid 200 OK response. The page states that the wallet lives at ~/.fx/wallet.json, that its private key remains local, and that spending requires an interactive terminal approval.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

$PaidCommerce or pricing visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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