{"provider":{"host":"chem.openverbs.com","name":"Molar mass","score":69.9,"live":true,"checkedAt":"2026-10-27T18:55:12.260Z","uptime72h":100,"lastCheck":{"httpStatus":402,"ms":620,"note":"valid x402 v2 terms"},"endpoints":3,"networks":["eip155:8453"],"cheapestUsd":"0.004","income7dUsd":"21.821","payers7d":28,"transfers7d":1470,"payoutAddressShared":true,"claimed":false,"page":"https://logicnodes.io/observatory/p/chem.openverbs.com"},"endpoints":[{"url":"https://chem.openverbs.com/v1/element","method":"POST","priceMicroUsd":4000,"networks":["eip155:8453"],"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."},{"url":"https://chem.openverbs.com/v1/molar-mass","method":"POST","priceMicroUsd":4000,"networks":["eip155:8453"],"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."},{"url":"https://chem.openverbs.com/v1/search","method":"POST","priceMicroUsd":4000,"networks":["eip155:8453"],"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."}]}