the402 endpoint detail

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api.magentlab.com calc pittsburgh_knee

https://api.magentlab.com/api/calc/pittsburgh_knee

answers 402

Pittsburgh knee rule (Seaberg 1994): after fall or blunt trauma, a knee radiograph is indicated if the patient cannot walk four weight-bearing steps or is younger than 12 or older than 50. Deterministic published rule with citation. Not a diagnosis; not the Ottawa knee rule.

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
109 ms
Payment options
1 usable of 1
Last checked
2026-09-06T01:17:14.124Z (2h ago)
Category
media

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.magentlab.com%2Fapi%2Fcalc%2Fpittsburgh_knee"