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Molar mass

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.

Visit chem.openverbs.com

Hostchem.openverbs.com
Price$0.004 per call
NetworkBase
Paid endpoints listed3
Calls, last 30 days*5
Most unique payers on one endpoint (30 days)*2
Last paid call*2026-10-08
Tagsmolar mass, calculate molecular weight, chemical formula mass, formula composition, molar mass api, element lookup, periodic table element, atomic number lookup

* From the public x402 Bazaar index (snapshot 2026-10-18T04:07Z); reported by the facilitator, not measured by us.

Endpoints

URLMethodPrice
https://chem.openverbs.com/v1/molar-mass
Compute the molar mass (g/mol) of a chemical formula. Supports nested parentheses and brackets, element multipliers,…		POST$0.004
https://chem.openverbs.com/v1/element
Look up a periodic-table element by exactly one of `symbol` (e.g. "Fe"), `name` (e.g. "iron") or atomic `number`…		POST$0.004
https://chem.openverbs.com/v1/search
Search the periodic table by name or symbol substring. Exact matches rank first, then prefix matches, then substring…		POST$0.004

Source: x402 Bazaar discovery API (Coinbase CDP) · Licence: Public discovery metadata; descriptions by each provider. Listed in x402 pay-per-call APIs. We list tools; we do not test, rate or endorse them.

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