Task

Physical Constant Lookup

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.

Constant lookup x402 REST usage

Look up a physical constant by its key (e.g. "speed-of-light"), symbol (e.g. "c") or exact name. Returns the CODATA 2018 recommended value, unit, relative standard uncertainty (0 for values that are exact by SI definitio...

physics.openverbs.com Data & Finance 1 calls / 30d checked 2026-10-26

0.004 USDC per call per call

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