Constant list
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.
| Host | physics.openverbs.com |
|---|---|
| Price | $0.004 per call |
| Network | Base |
| Paid endpoints listed | 3 |
| Calls, last 30 days* | 5 |
| Most unique payers on one endpoint (30 days)* | 3 |
| Last paid call* | 2026-10-06 |
| Tags | list physical constants, codata constants list, physics categories api, constants by category, physical constants dataset, physical constant lookup, codata constant api, physics constant value |
* From the public x402 Bazaar index (snapshot 2026-10-18T04:07Z); reported by the facilitator, not measured by us.
Endpoints
| URL | Method | Price |
|---|---|---|
https://physics.openverbs.com/v1/listList every physical constant in the dataset, or only those in a given category (universal, adopted, electromagnetic,… | POST | $0.004 |
https://physics.openverbs.com/v1/constantLook up a physical constant by its key (e.g. "speed-of-light"), symbol (e.g. "c") or exact name. Returns the CODATA… | POST | $0.004 |
https://physics.openverbs.com/v1/searchSearch the constants table by key, symbol or name substring. Exact matches rank first, then prefix matches, then… | 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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