Task

Extract Expression Variables

1 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.

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 1 calls / 30d checked 2026-11-01

0.004 USDC per call per call

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