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lilambd Constants Lookup by ID
x402
lilambd Constants Lookup by ID is a paid API for AI agents from api.lilambd.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-02).
Retrieves a named physical or mathematical constant by its identifier from the lilambd constants database
Price / call$0.005
Success—
StatusUnknown
How this service works
A crossing for play, feeling, language, science and computation — creating states that do not have names yet.
Output
Returns a JSON object with a 'data' array containing the constant's details, a 'count' of results returned, and an 'attribution' string with the source licence line for the constant data.
Example use cases
Retrieve Boltzmann constant for simulation
“I need the value and source attribution for the Boltzmann constant — can you fetch it from the constants database using its ID 'boltzmann'?”
Cite a constant in a scientific document
“Pull the constant with ID 'speed_of_light' from lilambd so I can include its value and proper licence attribution in my paper.”
Verify a mathematical constant's exact value
“What's the exact value stored in the lilambd constants database for the constant ID 'euler_number', and where does the data come from?”
Technical details
Endpoint
GEThttps://api.lilambd.com/units/constants/%7Bid%7D?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically retrieve a specific physical, mathematical, or scientific constant by a known identifier and require source attribution alongside the value. Prefer this over manual lookup when building scientific computation pipelines, citation tools, or educational apps that need verified constant values with licence information.
Side effects
- Unknown or invalid constant ID returns empty data array with count 0
- Malformed path parameter may result in a 404 or error response
- Payment failure (x402) prevents access to the endpoint
- No schema-level validation on query params may cause silent ignoring of extras
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"data": [],
"count": 0,
"attribution": "source licence line"
}
}Tags
x402
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