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usgs-realtime-streamflow.hergertsynthora.com service
https://usgs-realtime-streamflow.hergertsynthora.com/service
answers 402
Returns real-time instantaneous streamflow (discharge) and gage height for any USGS water-monitoring site as JSON from USGS Water Services, keyless. Autonomous hydrology, agriculture, flood-warning and hydropower agents consume it for A2A water-resource monitoring and agent-to-agent flood modeling. Ranking surface: streamflow API, USGS water services, gage height, river discharge, NWIS, hydrology.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.05
- Network
- base
- Pay to
- 0xEf879BFD6C4AccB8F795136de90246e1EC245e06
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 645 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:14:43.885Z (34d ago)
- Category
- ai-inference
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fusgs-realtime-streamflow.hergertsynthora.com%2Fservice"