Chess Move Validator API

GET

Catch invalid chess notation before recording moves in your game.

Chess Move Validator verifies algebraic chess notation and identifies move types including castling, captures, checks, and promotions.

Try it — live request, no key required

Request

GETapi.apiverve.com/v1/chessmovevalidator?move=Nf3

Query parameters

movestring

Verification

Format

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

Example

{
  "status": "ok",
  "error": null,
  "data": {
    "move": "Nf3",
    "valid": true,
    "type": "piece move",
    "piece": "N",
    "capture": false,
    "check": false,
    "checkmate": false,
    "promotion": false
  }
}

About the Chess Move Validator API

Supports all standard algebraic notation including castling (O-O, O-O-O), pawn moves, piece moves, captures, checks, and checkmates.

What people use it for

Chess Applications: Validate user input in chess applications and games
Move Recording: Verify chess move notation for game recording and analysis systems
Notation Parsing: Parse and validate algebraic chess notation for chess engines
Game Analysis: Analyze chess notation in game databases and training applications

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 Chess Move Validator

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

Questions.

Common questions about the Chess Move Validator API.

Read the docs →

Does it support special moves like castling and promotions?

Yes, it supports all standard algebraic notation. That covers kingside and queenside castling, pawn promotions, standard piece moves, captures, checks, and checkmates.

Can it validate complete game sheets in a single call?

No, each call validates an individual move string. To process an entire game, send each move in sequence to the endpoint.

Are piece type, capture, and check details included on the Free plan?

No, the Free plan only returns whether the notation string is valid and the move itself. Detailed attributes like the moved piece, capture flags, check, checkmate, and promotion status are premium fields available on any paid plan.

Does it check if a move is legal on a specific board layout?

No, it verifies that the input follows proper algebraic chess notation rules rather than evaluating a live board state. It validates formatting and notation structure without tracking piece positions across turns.

How many move checks does the Free plan cover?

The Free plan provides 200 credits each month, covering 100 move checks at 2 credits per call. If you need higher capacity, the Starter plan covers up to 100,000 checks monthly, working out to about $0.30 per 1,000 calls.

Request parameters — GET /v1/chessmovevalidator

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
`move`Required	string	`Nf3`	Chess move in algebraic notation

Example request

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2

curl "https://api.apiverve.com/v1/chessmovevalidator?move=Nf3" \
  -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/chessmovevalidator

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": {
    "move": "Nf3",
    "valid": true,
    "type": "piece move",
    "piece": "N",
    "capture": false,
    "check": false,
    "checkmate": false,
    "promotion": 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
`move`	string	`"Nf3"`	The validated chess move in algebraic notation format
`valid`	boolean	`true`	Whether the move follows proper algebraic notation rules
`type`Premium	string	`"piece move"`	Classification of move type such as piece move or castling
`piece`Premium	string	`"N"`	The chess piece that moved in single letter notation
`capture`Premium	boolean	`false`	Indicates whether the move captures an opponent piece
`check`Premium	boolean	`false`	Indicates whether the move puts opponent king in check
`checkmate`Premium	boolean	`false`	Indicates whether the move results in checkmate condition
`promotion`Premium	boolean	`false`	Indicates whether the move involves pawn promotion

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	Chess Move Validator 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/chessmovevalidator

No SDK to install — this is a plain HTTPS call to /v1/chessmovevalidator 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/chessmovevalidator" \
  -H "x-api-key: YOUR_API_KEY"

Resources

GitHubapiverve/chessmovevalidator-apiSource, issues and the examples this page is built from.ReferenceChess Move Validator API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/chessmovevalidatornpm apiverve-chessmovevalidatorPyPI APIVerve.API.ChessMoveValidatorNuGet

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/chessmovevalidator

Install the Node.js SDK, then call the Chess Move Validator 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/chessmovevalidator

Node.js

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

Resources

npm@apiverve/chessmovevalidatorThe published Node.js client, versioned and signed.GitHubapiverve/chessmovevalidator-apiSource, issues and the examples this page is built from.ReferenceChess Move Validator API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

apiverve-chessmovevalidatorPyPI APIVerve.API.ChessMoveValidatorNuGet

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

Call it from Python — GET /v1/chessmovevalidator

Install the Python SDK, then call the Chess Move Validator 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-chessmovevalidator

Python

import requests

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

Resources

PyPIapiverve-chessmovevalidatorThe published Python client, versioned and signed.GitHubapiverve/chessmovevalidator-apiSource, issues and the examples this page is built from.ReferenceChess Move Validator API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/chessmovevalidatornpm APIVerve.API.ChessMoveValidatorNuGet

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/chessmovevalidator

Install the C# / .NET SDK, then call the Chess Move Validator 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.ChessMoveValidator

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/chessmovevalidator");
Console.WriteLine(json);

Resources

NuGetAPIVerve.API.ChessMoveValidatorThe published C# / .NET client, versioned and signed.GitHubapiverve/chessmovevalidator-apiSource, issues and the examples this page is built from.ReferenceChess Move Validator API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/chessmovevalidatornpm apiverve-chessmovevalidatorPyPI

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

Call it from Go — GET /v1/chessmovevalidator

No SDK to install — this is a plain HTTPS call to /v1/chessmovevalidator 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/chessmovevalidator", 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/chessmovevalidatornpm apiverve-chessmovevalidatorPyPI APIVerve.API.ChessMoveValidatorNuGet

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

Call it from PHP — GET /v1/chessmovevalidator

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

PHP

$ch = curl_init("https://api.apiverve.com/v1/chessmovevalidator");
curl_setopt($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/chessmovevalidatornpm apiverve-chessmovevalidatorPyPI APIVerve.API.ChessMoveValidatorNuGet

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

Call it from Ruby — GET /v1/chessmovevalidator

No SDK to install — this is a plain HTTPS call to /v1/chessmovevalidator 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/chessmovevalidator")
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/chessmovevalidatornpm apiverve-chessmovevalidatorPyPI APIVerve.API.ChessMoveValidatorNuGet

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

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Chess Move Validator API

Try it — live request, no key required

About the Chess Move Validator API

What people use it for

Ways to call it

Other ways to use Chess Move Validator

Questions.

Request parameters — GET /v1/chessmovevalidator

Required

Authentication

Response — GET /v1/chessmovevalidator

Response fields

Response headers

Errors

What a call costs — 2 credits per call

Call it from cURL — GET /v1/chessmovevalidator

Resources

Also published for

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

Resources

Also published for

Call it from Python — GET /v1/chessmovevalidator

Resources

Also published for

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

Resources

Also published for

Call it from Go — GET /v1/chessmovevalidator

Resources

Also published for

Call it from PHP — GET /v1/chessmovevalidator

Resources

Also published for

Call it from Ruby — GET /v1/chessmovevalidator

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — Chess Move Validator API

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