← All endpoints
x402.outpimp.com physicalConstants
https://x402.outpimp.com/physicalConstants
answers 402
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.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.01
- Network
- base
- Pay to
- 0x548eFd4f4d4A5C3669dbb4CBB2B1A637FeeEc5F6
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 178 ms
- Payment options
- 2 usable of 2
- Last checked
- 2026-09-06T01:12:36.888Z (31d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fx402.outpimp.com%2FphysicalConstants"