Task

Expression Variable Lookup

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List expression variables x402 REST usage

Parse an expression and return the free variables it references, without evaluating it — so an agent can discover which inputs a formula needs before supplying values. A syntax error is a clean 400.

math.openverbs.com Web & Scraping 2 calls / 30d checked 2026-10-26

0.004 USDC per call per call

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