Coordinates Are Sea API

GET

Tell whether any coordinate point sits on land or in open water.

Coordinates Are Sea checks whether a given latitude and longitude pair sits in the ocean or on land. Pass geographic coordinates to receive a boolean confirming if the location is in the sea.

Try it — live request, no key required

Request

GETapi.apiverve.com/v1/coordinatesaresea?lat=37.7749&lon=-122.4194

Query parameters

latnumber

lonnumber

Verification

Format

No key required to try it. Get a key to use it in your app.

Example

{
  "status": "ok",
  "error": null,
  "data": {
    "latitude": 37.7749,
    "longitude": -122.4194,
    "isSea": false
  }
}

About the Coordinates Are Sea API

A simple land and sea API: pass a latitude and longitude and get back whether the point is at sea or on land. Coordinates are Sea works by analyzing the coordinates provided and checking if they are in the sea, then returns if the coordinates are in the sea or not.

What people use it for

Maritime Fleet Tracking: When a vessel transmits GPS telemetry, fleet dispatchers verify if the craft is in open water before updating route status.
Delivery Address Verification: Flag erroneous delivery addresses or fake driver locations when reported coordinates point to water instead of land.
Marine Biology Research: Marine researchers filter animal tag pings to separate offshore migration waypoints from coastal land resting sites.
Emergency Dispatch Routing: To route distress beacons accurately, emergency responders check incoming coordinates to deploy coast guard vessels instead of ground crews.

Ways to call it

One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.

JSON: Default REST response
XML: Markup format
YAML: Human-readable
CSV: Tabular export
GraphQL: Query language
MCP: For AI agents

View all integrations →

Other ways to use Coordinates Are Sea

Same data, same APIVerve account, same credit balance — one key works on all of them.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.on VerveKit Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.on VerveSheets Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.on VerveContext

Questions.

Common questions about the Coordinates Are Sea API.

Read the docs →

Is it cheap enough to check coordinates for every location ping?

Yes. Each lookup costs 2 credits, which works out to about $0.0003 per call on the Starter plan, or $0.30 for every 1,000 coordinates checked. The Starter plan includes enough credits for 100,000 checks each month. You can also evaluate the service using 100 checks every month on the Free plan.

Does this check cover any geographic point worldwide?

Yes. You can supply any coordinate pair across the entire globe. The check evaluates the latitude and longitude to determine whether that location falls in the sea.

How does the response indicate whether a location is in the ocean?

The endpoint returns a simple boolean field indicating whether the point is located in the sea. It also echoes back the latitude and longitude values you submitted so you can easily correlate the result with your input.

What coordinate format does the API require?

The API accepts coordinates as decimal degree numbers for both latitude and longitude. You pass standard numeric values for the query parameters rather than degrees-minutes-seconds strings.

Can I use the sea check results in a commercial product?

Yes, as long as you are on any paid plan. The Free plan is limited to non-commercial evaluation. Paid plans allow you to integrate the check into your live customer-facing systems, provided you do not resell or redistribute the raw data as-is.

Request parameters — GET /v1/coordinatesaresea

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.

Required

Parameter	Type	Example	Description
`lat`Required	number	`37.7749`	The latitude of the coordinates range -90-90
`lon`Required	number	`-122.4194`	The longitude of the coordinates range -180-180

Example request

1
2

curl "https://api.apiverve.com/v1/coordinatesaresea?lat=37.7749&lon=-122.4194" \
  -H "x-api-key: YOUR_API_KEY"

Authentication

Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.

Header	When	Value
`x-api-key`Required	Every request	Your API key. Header names are case-insensitive, so `X-API-Key` is the same header.
`Authorization`Alternate	Instead of the above	`Bearer <key>` — for clients that only expose bearer auth. Resolves to the same account and the same billing.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Response — GET /v1/coordinatesaresea

Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "latitude": 37.7749,
    "longitude": -122.4194,
    "isSea": false
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`latitude`	number	`37.7749`	The latitude coordinate value provided in request
`longitude`	number	`-122.4194`	The longitude coordinate value provided in request
`isSea`	boolean	`false`	Whether the coordinates are located in the sea

Response headers

Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.

Header	What it carries
`x-api-remaining-credits`	Credits left in the current cycle
`x-api-credits-used`	Credits spent in the current cycle
`x-api-max-credits`	The allowance for the cycle
`x-api-version`	Version of the endpoint that answered

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter that has to change.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted here	A key restriction or an IP allow-list — never a bad key.
`429`	Rate limited, or out of credits	Read `error` to tell them apart, then back off or top up.

What a call costs — 2 credits per call

Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.

Plan	Per month	Credits	Coordinates Are Sea calls	Per 1,000 calls
Free	Free	200	100	Free
Starter	$29.99	200,000	100,000	$0.30
Pro	$99.99	1,000,000	500,000	$0.20
Mega	$299.99	4,000,000	2,000,000	$0.15

Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.

Compare all pricing tiers →

Call it from cURL — GET /v1/coordinatesaresea

No SDK to install — this is a plain HTTPS call to /v1/coordinatesaresea with your key in the x-api-key header. Swap in a real key and it runs as-is.

cURL

1
2

curl "https://api.apiverve.com/v1/coordinatesaresea" \
  -H "x-api-key: YOUR_API_KEY"

Resources

GitHubapiverve/coordinatesaresea-apiSource, issues and the examples this page is built from.ReferenceCoordinates Are Sea API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/coordinatesareseanpm apiverve-coordinatesareseaPyPI APIVerve.API.CoordinatesAreSeaNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Node.js — GET /v1/coordinatesaresea

Install the Node.js SDK, then call the Coordinates Are Sea API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — npm

npm install @apiverve/coordinatesaresea

Node.js

const res = await fetch("https://api.apiverve.com/v1/coordinatesaresea", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Resources

npm@apiverve/coordinatesareseaThe published Node.js client, versioned and signed.GitHubapiverve/coordinatesaresea-apiSource, issues and the examples this page is built from.ReferenceCoordinates Are Sea API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

apiverve-coordinatesareseaPyPI APIVerve.API.CoordinatesAreSeaNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Python — GET /v1/coordinatesaresea

Install the Python SDK, then call the Coordinates Are Sea API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — PyPI

pip install apiverve-coordinatesaresea

Python

import requests

res = requests.get(
    "https://api.apiverve.com/v1/coordinatesaresea",
    headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])

Resources

PyPIapiverve-coordinatesareseaThe published Python client, versioned and signed.GitHubapiverve/coordinatesaresea-apiSource, issues and the examples this page is built from.ReferenceCoordinates Are Sea API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/coordinatesareseanpm APIVerve.API.CoordinatesAreSeaNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from C# / .NET — GET /v1/coordinatesaresea

Install the C# / .NET SDK, then call the Coordinates Are Sea API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — NuGet

dotnet add package APIVerve.API.CoordinatesAreSea

C# / .NET

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

var json = await client.GetStringAsync("https://api.apiverve.com/v1/coordinatesaresea");
Console.WriteLine(json);

Resources

NuGetAPIVerve.API.CoordinatesAreSeaThe published C# / .NET client, versioned and signed.GitHubapiverve/coordinatesaresea-apiSource, issues and the examples this page is built from.ReferenceCoordinates Are Sea API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/coordinatesareseanpm apiverve-coordinatesareseaPyPI

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Go — GET /v1/coordinatesaresea

No SDK to install — this is a plain HTTPS call to /v1/coordinatesaresea with your key in the x-api-key header. Swap in a real key and it runs as-is.

req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/coordinatesaresea", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")

res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Resources

Also published for

@apiverve/coordinatesareseanpm apiverve-coordinatesareseaPyPI APIVerve.API.CoordinatesAreSeaNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from PHP — GET /v1/coordinatesaresea

No SDK to install — this is a plain HTTPS call to /v1/coordinatesaresea with your key in the x-api-key header. Swap in a real key and it runs as-is.

PHP

$ch = curl_init("https://api.apiverve.com/v1/coordinatesaresea");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);

$response = curl_exec($ch);
echo $response;

Resources

Also published for

@apiverve/coordinatesareseanpm apiverve-coordinatesareseaPyPI APIVerve.API.CoordinatesAreSeaNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Ruby — GET /v1/coordinatesaresea

No SDK to install — this is a plain HTTPS call to /v1/coordinatesaresea with your key in the x-api-key header. Swap in a real key and it runs as-is.

Ruby

require "net/http"

uri = URI("https://api.apiverve.com/v1/coordinatesaresea")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.body

Resources

Also published for

@apiverve/coordinatesareseanpm apiverve-coordinatesareseaPyPI APIVerve.API.CoordinatesAreSeaNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

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Coordinates Are Sea API

Try it — live request, no key required

About the Coordinates Are Sea API

What people use it for

Ways to call it

Other ways to use Coordinates Are Sea

Questions.

Request parameters — GET /v1/coordinatesaresea

Required

Authentication

Response — GET /v1/coordinatesaresea

Response fields

Response headers

Errors

What a call costs — 2 credits per call

Call it from cURL — GET /v1/coordinatesaresea

Resources

Also published for

Call it from Node.js — GET /v1/coordinatesaresea

Resources

Also published for

Call it from Python — GET /v1/coordinatesaresea

Resources

Also published for

Call it from C# / .NET — GET /v1/coordinatesaresea

Resources

Also published for

Call it from Go — GET /v1/coordinatesaresea

Resources

Also published for

Call it from PHP — GET /v1/coordinatesaresea

Resources

Also published for

Call it from Ruby — GET /v1/coordinatesaresea

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — Coordinates Are Sea API

Geography

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