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x402.forgemesh.io element-lookup
https://x402.forgemesh.io/element-lookup
payable
Periodic table API: complete data for any of the 118 chemical elements — look up by symbol (Fe), name (iron), or atomic number (26). Returns atomic mass, category, phase at STP, period/group, electron configuration, electronegativity, melting and boiling points, density, electron shells, and a summary. For chemistry, materials, education, and science agents. Attributed dataset.
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
- 39 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:17:29.918Z (2d ago)
- Category
- search
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fx402.forgemesh.io%2Felement-lookup"