Observed arrival · 2026-09-02

Fatstack’s Pay-Per-Call Tool Market

fatstack.net Observed source

Editorial interest 84/100 Selection signal · not a rating of the site

Fatstack lets AI agents discover and pay for API and MCP tool calls individually with USDC on Base.

Landing page captured for the 2026-09-02 issue.

Field notes

Fatstack describes a wallet-based alternative to accounts, subscriptions, and rotating API keys. Its payFetch example sends a POST request to an MCP endpoint, checks a $0.01 per-call and $1 daily limit, then handles the 402 response and retry. The catalog currently includes small utilities such as CSV-to-JSON conversion, cron explanation, and an echo endpoint. Displayed example metrics show one seven-day call each, while uptime and error data are blank.

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

One card from the complete issue

A Commons Made of Smoke

312,505 arrived 1,000 judged 999 catalogued Enter the complete issue