Ile d'Yeu Nord
Neptun covers Ile d'Yeu Nord (France) through the CANDHIS (Cerema) network. One GET request returns its readings as JSON — in the same shape as every other network Neptun serves, so you write the parsing once.
Source: CANDHIS (Cerema) · Position: 46.8332, -2.2950
Request
curl -H "Authorization: Bearer mapi_YOUR_KEY" \
"https://neptun.marine-api.com/v1/levels?lat=46.8332&lon=-2.2950&radius=5"