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Sindri Physical Constants Lookup
x402
Sindri Physical Constants Lookup is a paid API for AI agents from ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Returns exact CODATA-published values for eight fundamental physical constants given a constant name enum.
Price / call$0.01
Success—
StatusUnknown
How this service works
Lookup of standard physical constants (speed of light, gravitational constant, Planck constant, elementary charge, Avogadro number, Boltzmann constant, gas constant, electron mass) with exact published CODATA values.
Output
Returns the exact CODATA-published numeric value and unit for the requested physical constant (e.g. speed of light: 299792458 m/s, gravitational constant: 6.67430e-11 N⋅m²/kg²).
Example use cases
Physics calculation grounding
“I'm doing a thermodynamics calculation and need the exact CODATA value of the Boltzmann constant — can you look that up for me?”
Science homework fact-check
“What is the exact published value of Avogadro's number according to CODATA? I want to make sure I'm using the right figure.”
Unit conversion pre-step
“Before I convert some energy units, I need the exact value of the Planck constant — can you fetch the CODATA value?”
Technical details
Endpoint
POSThttps://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/physicalConstants?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need authoritative, exact CODATA values for fundamental physical constants rather than relying on an LLM's memorized (and potentially imprecise) training data. Ideal for scientific calculations, unit conversions, or any workflow requiring high-precision constant values.
Side effects
- Invalid or unsupported constant name returns an error — only the eight enumerated constants are supported
- Malformed request body (missing 'constant' field) returns a validation error
- Lambda cold start may add latency on first call
- Payment failure or insufficient USDC balance blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| constant | string | Which constant to look up. |
Tags
x402
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