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Evaluate a mathematical expression with optional named variables — arithmetic, comparison and logic operators plus functions like sqrt, abs, min, max, sin, cos, log, floor, round, etc. A syntax error, an undefined variable, or a non-finite result is a clean 400. The factorial operator is disabled for safety.
# 1. Ask the endpoint what it costs (no payment, no wallet needed): curl -i -X GET 'https://math.openverbs.com/v1/eval' # -> HTTP/1.1 402 Payment Required # the response carries the price, asset and pay-to address. # 2. Pay and retry with any x402 client: npx x402-fetch 'https://math.openverbs.com/v1/eval'
Endpoint: https://math.openverbs.com/v1/eval. Operated by math.openverbs.com, not by Animica. Price and availability were correct at the last probe on 2026-10-01 and are set by the operator, who may change them.
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 …