the402 endpoint detail

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2s.io gov usgs-water

https://2s.io/api/gov/usgs-water

payable

Real-time water data from USGS NWIS stream / river / groundwater gauges within a bounding box around lat/lon. Returns each site's latest reading per requested variable: streamflow (00060, ft³/s), gage height (00065, ft), water temperature (00010, °C), precipitation (00045, in), and others. Each reading: site code + name, lat/lon, variable name + description + unit, value (or null if no data / sent

We sent a real GET request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.006
Network
base
Pay to
0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
GET
Response latency
112 ms
Payment options
2 usable of 2
Last checked
2026-08-10T09:17:44.629Z (1d ago)
Category
data

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2F2s.io%2Fapi%2Fgov%2Fusgs-water"