← All endpoints
402utils.com v1 unit-convert
https://402utils.com/v1/unit-convert
answers 402
Convert a value between units in the same physical dimension: length, mass, volume, temperature, area, speed, data, energy, pressure, time, angle. Factors are exact SI constants (NIST SP 811) — deterministic, unlike an LLM's guess. Pass ?category=currency to convert ISO 4217 amounts at ECB reference rates instead (informational, not for pricing). Unknown units → 400 with a suggestion.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.001
- Network
- base
- Pay to
- 0xc55A2D530b53CBaD1001e4AfD4720B7E71f9C291
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 1526 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:21:07.212Z (2h ago)
- Category
- ai-inference
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2F402utils.com%2Fv1%2Funit-convert"