# Kelvin Converter — Scientific Temperature Conversion API

> Kelvin Converter — Scientific Temperature Conversion API is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Converts a temperature value from Kelvin, Celsius, Fahrenheit, or Rankine to all other scales with exact scientific precision, returning results in all four units.

## Facts

- Endpoint: POST https://x402.forgemesh.io/kelvin-converter
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kelvin-converter-scientific-temperature-conversion-api-9cf5f693
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8K89HQoXY89rl6KghLzT_

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 kelvin-converter-scientific-temperature-conversion-api-9cf5f693 -d '<json body>'
```

Example prompt: Convert 373.15 Kelvin to Celsius, Fahrenheit, and Rankine — I need scientifically exact values for a thermodynamics calculation.

## When to prefer this

Choose this endpoint when you need scientifically exact temperature conversions involving Kelvin or Rankine, particularly for thermodynamics, physics, chemistry, or materials-science contexts where approximate conversion formulas are insufficient. Prefer it over general unit-conversion APIs when absolute temperature scales (Kelvin, Rankine) are involved and precision is critical.

## Known failure modes

- Invalid 'from' scale value (not one of C, F, K, R) — likely returns a 400 error or validation failure
- Non-numeric 'value' string — parsing error returned
- Physically impossible value (e.g. temperature below absolute zero) — may return an error or unexpected result
- Missing required fields — API returns an error indicating required parameters
- Payment failure (insufficient USDC balance for x402 micropayment) — 402 Payment Required

## How this service works

Converts absolute Kelvin temperatures to and from Celsius, Fahrenheit, and Rankine with exact scientific precision. For physics and chemistry calculations, materials-science thresholds, and any agent working with thermodynamic data where an approximate conversion isn't good enough.

## Output

Returns the input temperature converted to all four scales (Kelvin, Celsius, Fahrenheit, Rankine) with exact scientific precision, suitable for use in thermodynamic, chemistry, or materials-science calculations.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "from": {
   "type": "string",
   "description": "C | F | K | R"
  },
  "value": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "kelvin": 373.15,
  "celsius": 100,
  "rankine": 671.67,
  "fahrenheit": 212
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kelvin-converter-scientific-temperature-conversion-api-9cf5f693/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)