Coin Flipper API

GET

Run coin flip simulations with heads and tails outcome tracking.

Coin Flipper simulates random coin flips and records heads or tails outcomes with flip counts. Paid plans can simulate multiple flips per request and calculate percentages, streak lengths, and fairness indicators.

Try it — live request, no key required

Request

GETapi.apiverve.com/v1/coinflipper

Verification

Format

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

Example

{
  "status": "ok",
  "error": null,
  "data": {
    "total_flips": 10,
    "flips": [
      "Tails",
      "Heads",
      "Heads",
      "Tails",
      "Tails",
      "Heads",
      "Tails",
      "Tails",
      "Tails",
      "Tails"
    ],
    "heads_count": 3,
    "tails_count": 7,
    "heads_percentage": 30,
    "tails_percentage": 70,
    "longest_streak": {
      "length": 4,
      "type": "Tails"
    },
    "first_flip": "Tails",
    "last_flip": "Tails",
    "is_fair": false
  }
}

About the Coin Flipper API

Coin Flipper works by generating random coin flip results using fair probability (50/50), tracking individual flips, and calculating comprehensive statistics including streaks and distribution analysis.

What people use it for

Decision Making: Make random decisions and choices using fair coin flip probability
Gaming: Implement coin flip mechanics for games, sports, and random selection features
Probability Teaching: Demonstrate probability concepts and random distributions in education
Simulations: Run probability experiments and test statistical concepts with multiple flips

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 Coin Flipper

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 Coin Flipper API.

Read the docs →

How many coin flip simulations does the Free plan cover?

The Free plan provides 200 credits each month, covering 100 simulations at 2 credits per call. For higher volumes, the Starter plan covers up to 100,000 simulations per month, which works out to about $0.30 per 1,000 calls.

Are streak lengths and fairness scores included on the Free plan?

No, longest streak length, streak type, percentage distributions, and the fairness indicator are premium fields. Any paid plan unlocks these statistics alongside access to custom batch flip parameters.

Can I set a custom number of flips on the Free plan?

No, the flips parameter is restricted to paid plans. Free plan requests run using the default simulation count, while upgrading to Starter or above allows you to pass a custom flip count per call.

Does the API return each individual flip outcome?

Yes, the response provides an array of individual results marked as Heads or Tails. You also get dedicated fields for the first flip, the last flip, and aggregate counts for both outcomes across the simulation.

Can this API be used to analyze coin toss streaks?

Yes, on paid plans. Coin Flipper tracks consecutive flip streaks across multi-coin simulations. It reports the length of the longest streak and identifies whether it consisted of consecutive heads or tails.

Request parameters — GET /v1/coinflipper

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.

Optional

Parameter	Type	Example	Description
`flips`OptionalPremium	integer	`10`	Number of coins to flip default 1 · range 1-10000

Example request

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curl "https://api.apiverve.com/v1/coinflipper?flips=10" \
  -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/coinflipper

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": {
    "total_flips": 10,
    "flips": [
      "Tails",
      "Heads",
      "Heads",
      "Tails",
      "Tails",
      "Heads",
      "Tails",
      "Tails",
      "Tails",
      "Tails"
    ],
    "heads_count": 3,
    "tails_count": 7,
    "heads_percentage": 30,
    "tails_percentage": 70,
    "longest_streak": {
      "length": 4,
      "type": "Tails"
    },
    "first_flip": "Tails",
    "last_flip": "Tails",
    "is_fair": 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
`total_flips`	number	`10`	Total number of coin flips performed in simulation
`flips`	array	`[Tails, ...]`	Array of individual flip results as Heads or Tails
`heads_count`	number	`3`	Total count of heads outcomes from all flips
`tails_count`	number	`7`	Total count of tails outcomes from all flips
`heads_percentage`Premium	number	`30`	Percentage of heads outcomes as decimal
`tails_percentage`Premium	number	`70`	Percentage of tails outcomes as decimal
`longest_streak`	object	`{...}`	The longest run of the same result anywhere in this set of flips
`length`Premium	number	`4`	How many flips long that run was
`type`Premium	string	`"Tails"`	Which result the run was made of, Heads or Tails
`first_flip`	string	`"Tails"`	Result of the first coin flip performed
`last_flip`	string	`"Tails"`	Result of the last coin flip performed
`is_fair`Premium	boolean	`false`	Statistical indicator of fair coin flip distribution

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	Coin Flipper 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/coinflipper

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

cURL

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

Resources

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

Also published for

@apiverve/coinflippernpm apiverve-coinflipperPyPI APIVerve.API.CoinFlipperNuGet

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/coinflipper

Install the Node.js SDK, then call the Coin Flipper 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/coinflipper

Node.js

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

Resources

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

Also published for

apiverve-coinflipperPyPI APIVerve.API.CoinFlipperNuGet

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

Call it from Python — GET /v1/coinflipper

Install the Python SDK, then call the Coin Flipper 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-coinflipper

Python

import requests

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

Resources

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

Also published for

@apiverve/coinflippernpm APIVerve.API.CoinFlipperNuGet

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/coinflipper

Install the C# / .NET SDK, then call the Coin Flipper 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.CoinFlipper

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

Resources

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

Also published for

@apiverve/coinflippernpm apiverve-coinflipperPyPI

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

Call it from Go — GET /v1/coinflipper

No SDK to install — this is a plain HTTPS call to /v1/coinflipper 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/coinflipper", 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/coinflippernpm apiverve-coinflipperPyPI APIVerve.API.CoinFlipperNuGet

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

Call it from PHP — GET /v1/coinflipper

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

PHP

$ch = curl_init("https://api.apiverve.com/v1/coinflipper");
curl_setopt($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/coinflippernpm apiverve-coinflipperPyPI APIVerve.API.CoinFlipperNuGet

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

Call it from Ruby — GET /v1/coinflipper

No SDK to install — this is a plain HTTPS call to /v1/coinflipper 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/coinflipper")
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/coinflippernpm apiverve-coinflipperPyPI APIVerve.API.CoinFlipperNuGet

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

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Coin Flipper API

Try it — live request, no key required

About the Coin Flipper API

What people use it for

Ways to call it

Other ways to use Coin Flipper

Questions.

Request parameters — GET /v1/coinflipper

Optional

Authentication

Response — GET /v1/coinflipper

Response fields

Response headers

Errors

What a call costs — 2 credits per call

Call it from cURL — GET /v1/coinflipper

Resources

Also published for

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

Resources

Also published for

Call it from Python — GET /v1/coinflipper

Resources

Also published for

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

Resources

Also published for

Call it from Go — GET /v1/coinflipper

Resources

Also published for

Call it from PHP — GET /v1/coinflipper

Resources

Also published for

Call it from Ruby — GET /v1/coinflipper

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — Coin Flipper API

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