# Chemical Element Lookup

> Chemical Element Lookup is a paid API for AI agents from x402.outpimp.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns the name, atomic mass, and category of a periodic table element given its symbol or atomic number.

## Facts

- Endpoint: POST https://x402.outpimp.com/chemicalElementLookup
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chemical-element-lookup-2fd3a37b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EnXpqHKtMWZNeVX7J9gNQ

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 chemical-element-lookup-2fd3a37b -d '<json body>'
```

Example prompt: What's the atomic mass and category of gold? Look it up by its symbol Au.

## When to prefer this

Choose this endpoint when an agent needs quick, structured periodic table data — element name, atomic mass, and category — for a known symbol or atomic number, without needing full elemental property sheets or isotope data.

## Known failure modes

- Unknown or unsupported element symbol returns an error or empty result
- Providing neither symbol nor atomicNumber causes a validation error
- Very rare or recently named elements may not be covered
- Malformed symbol input (e.g. numeric string when symbol expected) returns an error

## How this service works

Periodic table element lookup by symbol or atomic number, returning name, atomic mass, and category. Covers the most commonly referenced elements.

## Output

Returns the element's full name (e.g. 'Gold'), atomic mass (e.g. 196.967), and category (e.g. 'transition metal') for the queried symbol or atomic number.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "symbol": {
   "type": "string",
   "description": "Element symbol, e.g. \"Au\" (case-insensitive). Provide this or atomicNumber."
  },
  "atomicNumber": {
   "type": "number",
   "description": "Atomic number, e.g. 79. Provide this or symbol."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chemical-element-lookup-2fd3a37b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.outpimp.com](https://www.zero.xyz/host/x402.outpimp.com/llms.txt)