{"x402Version":2,"name":"Chemistry","description":"Periodic-table lookup and molar-mass computation — look up any of the 118 elements by symbol, name or atomic number, search the table, and compute the molar mass and composition of a chemical formula.","version":"0.1.0","openapi":"https://chem.openverbs.com/openapi.json","resources":[{"url":"https://chem.openverbs.com/v1/element","method":"POST","description":"Look up a periodic-table element by exactly one of `symbol` (e.g. \"Fe\"), `name` (e.g. \"iron\") or atomic `number` (1..118). Returns its number, symbol, name, standard atomic weight and whether that weight is a true standard atomic weight.","tags":["element lookup","periodic table element","atomic number lookup","element symbol lookup","atomic weight lookup","chemistry element api"],"accepts":[{"scheme":"exact","network":"eip155:8453","price":"$0.004","payTo":"0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A","asset":"USDC"}]},{"url":"https://chem.openverbs.com/v1/search","method":"POST","description":"Search the periodic table by name or symbol substring. Exact matches rank first, then prefix matches, then substring matches. Returns up to `limit` elements (default 20) plus the total match count.","tags":["search periodic table","element search","find element by name","find element by symbol","periodic table search api","chemical element lookup"],"accepts":[{"scheme":"exact","network":"eip155:8453","price":"$0.004","payTo":"0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A","asset":"USDC"}]},{"url":"https://chem.openverbs.com/v1/molar-mass","method":"POST","description":"Compute the molar mass (g/mol) of a chemical formula. Supports nested parentheses and brackets, element multipliers, and hydrate dot notation with coefficients (e.g. \"Ca(OH)2\", \"CuSO4·5H2O\", \"K4[Fe(CN)6]\"). Returns the total mass and the per-element composition with mass fraction percentages.","tags":["molar mass","calculate molecular weight","chemical formula mass","formula composition","molar mass api","hydrate formula mass","element percent composition"],"accepts":[{"scheme":"exact","network":"eip155:8453","price":"$0.004","payTo":"0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A","asset":"USDC"}]}]}