{"x402Version":2,"name":"Physics constants","description":"CODATA 2018 physical-constants lookup — resolve any of the fundamental constants by key, symbol or name, search the table, or list them by category. Each result carries the recommended value, unit and relative standard uncertainty.","version":"0.1.0","openapi":"https://physics.openverbs.com/openapi.json","resources":[{"url":"https://physics.openverbs.com/v1/constant","method":"POST","description":"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 definition) and category.","tags":["physical constant lookup","codata constant api","physics constant value","lookup speed of light","scientific constant lookup","constant by symbol"],"accepts":[{"scheme":"exact","network":"eip155:8453","price":"$0.004","payTo":"0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A","asset":"USDC"}]},{"url":"https://physics.openverbs.com/v1/search","method":"POST","description":"Search the constants table by key, symbol or name substring. Exact matches rank first, then prefix matches, then substring matches. Returns up to `limit` constants (default 20) plus the total match count.","tags":["search physical constants","codata search api","physics constants search","find constant by name","constant name lookup","search by constant symbol"],"accepts":[{"scheme":"exact","network":"eip155:8453","price":"$0.004","payTo":"0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A","asset":"USDC"}]},{"url":"https://physics.openverbs.com/v1/list","method":"POST","description":"List every physical constant in the dataset, or only those in a given category (universal, adopted, electromagnetic, atomic, physico-chemical). Returns the constants, the total count and the set of available categories.","tags":["list physical constants","codata constants list","physics categories api","constants by category","physical constants dataset","browse science constants"],"accepts":[{"scheme":"exact","network":"eip155:8453","price":"$0.004","payTo":"0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A","asset":"USDC"}]}]}