← All endpoints
x402.forgemesh.io periodic-table
https://x402.forgemesh.io/periodic-table
payable
Periodic table API: full data for any of the 118 elements by symbol, name, or atomic number — atomic mass, category, phase, electron configuration, electronegativity, melting/boiling points, density, and more.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.002
- Network
- base
- Pay to
- 0x850363a27F0aC6fEb9C7a3eC4C1d295262dF9432
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 38 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:17:29.884Z (2d ago)
- Category
- data
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fx402.forgemesh.io%2Fperiodic-table"