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api.magentlab.com calc ttkg
https://api.magentlab.com/api/calc/ttkg
answers 402
Transtubular potassium gradient (TTKG) from plasma potassium, urine potassium, plasma osmolality, and urine osmolality (Ethier JH et al., Am J Kidney Dis 1990). TTKG = (urine_k / potassium) / (urine_osm / plasma_osm), 1 decimal. Not valid when urine osmolality is not greater than plasma osmolality (water diuresis). Numeric TTKG only; not a potassium-disorder diagnosis or medical device.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.005
- Network
- base
- Pay to
- 0x836Be278f1739fB4308091cD1852F7971Bc19Ee2
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 74 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:17:16.772Z (2h ago)
- Category
- other
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.magentlab.com%2Fapi%2Fcalc%2Fttkg"