# Periodic Table Element Lookup API

> Periodic Table Element Lookup API is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-16).

Returns comprehensive data for any of the 118 chemical elements given a symbol, name, or atomic number

## Facts

- Endpoint: POST https://x402.forgemesh.io/element-lookup
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/periodic-table-element-lookup-api-b0e82f89
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0FR0coMjGYG-P2RSWrrPC

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability periodic-table-element-lookup-api-b0e82f89 -d '<json body>'
```

Example prompt: What are the full properties of iron — atomic mass, melting point, electron configuration, electronegativity, and everything else from the periodic table?

## When to prefer this

Use this endpoint when an agent needs authoritative, structured chemistry data for a specific element — especially when multiple properties are needed at once (mass, configuration, phase, electronegativity, etc.). Prefer over scraping Wikipedia or using an LLM's internal knowledge when accuracy and structured output are required. Ideal for chemistry education tools, materials science pipelines, and science agents that need reliable, citable element data.

## Known failure modes

- Unknown or misspelled element symbol/name returns an error or empty result
- Atomic number out of range (>118 or <1) returns an error
- Ambiguous input (e.g. partial name) may fail to resolve
- Network or payment authorization failure returns HTTP 402 or 5xx

## How this service works

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.

## Output

A structured record for the requested element containing atomic mass, element category (e.g. transition metal), phase at STP (solid/liquid/gas), period and group numbers, full electron configuration string, electronegativity value, melting and boiling points (in Kelvin), density, electron shell counts, and a plain-language summary paragraph.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "element": {
   "type": "string",
   "description": "symbol, name, or atomic number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "name": "Iron",
  "symbol": "Fe",
  "category": "transition metal",
  "atomic_mass": 55.845,
  "atomic_number": 26,
  "melting_point_k": 1811.15
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/periodic-table-element-lookup-api-b0e82f89/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.forgemesh.io](https://www.zero.xyz/host/x402.forgemesh.io/llms.txt)