USGS Water Data

Real-time streamflow, gage height, and water-quality readings from thousands of USGS monitoring sites across the US. Machine-payable per request.

Robinhood Chain

Offers

Offer	Endpoint	Price
Daily values Daily statistics per site. Pass ?format=json&sites=01646500&parameterCd=00060&startDT=2026-01-01&endDT=2026-01-31.	`/m/usgs-water/daily`	0.005 USDG
Instantaneous values Latest sensor readings. Pass ?format=json&sites=01646500&parameterCd=00060,00065 (00060 = discharge cfs, 00065 = gage height ft); add &period=P1D for a day of history.	`/m/usgs-water/instant`	0.005 USDG

Machine-readable: openapi.json with x-payment-info offers.

Try it live

Run the full MPP flow from your browser: catch the 402, sign the payment with your wallet, and watch it settle on-chain.

Pay with an agent

Any MPP or x402-compatible client works. With mppx, payment is automatic:

// x402 exact scheme (permit2) on Robinhood Chain
// 1. GET the endpoint, read the payment-required header (base64 JSON)
// 2. Sign PermitWitnessTransferFrom against Permit2 for the advertised offer
//    (spender = x402ExactPermit2Proxy, witness.to = merchant wallet)
// 3. Retry with the payment-signature header; settlement tx arrives
//    in the payment-response header
const res = await fetch('https://api.meshgateway.co/m/usgs-water/daily', {
  headers: { 'payment-signature': signedPaymentPayload },
})

Or inspect the challenge yourself:

curl -i https://api.meshgateway.co/m/usgs-water/daily
# HTTP/1.1 402 Payment Required
# WWW-Authenticate: Payment id="…", method="evm", intent="charge", …