Stream a deterministic stock ticker as Server-Sent Events

GEThttps://api.testingapis.com/api/stream/sse/stockSign in to see this endpoint's URL

Each event: tick carries symbol, price, change, changePercent, volume and timestamp. The same tick number always yields the same symbol and price. The stream ends with event: done.

Swagger UI cannot display streams. Use curl instead:``curl -N "https://api.testingapis.com/api/stream/sse/stock?count=5"Swagger UI cannot display streams. Use curl instead:``curl -N "https://api.testingapis.com…"

Parameters 2

Name	Type	Description
`count`	query · integer (int32)	Number of ticks to send (1-100, default 20). Default: 20.
`interval`	query · integer (int32)	Delay between ticks in milliseconds (100-5000, default 1000). Default: 1000.

Responses

200: A text/event-stream of ticks.

Example

Request

curl -X GET "https://api.testingapis.com/api/stream/sse/stock?count=3" \
  -H "X-TestingApis-Key: YOUR_API_KEY"

Response200 OK

Content-Type: text/event-stream
Cache-Control: no-cache

retry: 3000

id: 1
event: tick
data: {"tick":1,"symbol":"AAPL","name":"Apple Inc.","price":230.19,"change":2.67,"changePercent":1.17,"volume":10137,"timestamp":"2026-09-30T18:26:40.…

id: 2
event: tick
data: {"tick":2,"symbol":"MSFT","name":"Microsoft Corp.","price":444.51,"change":6.40,"changePercent":1.46,"volume":10274,"timestamp":"2026-09-30T18:2…

id: 3
event: tick
data: {"tick":3,"symbol":"GOOGL","name":"Alphabet Inc.","price":177.47,"change":1.13,"changePercent":0.64,"volume":10411,"timestamp":"2026-09-30T18:26…

… (1 more lines)

The parameters, request and response examples and the live Try it panel for this endpoint are for signed-in members. Accounts are free and take a few seconds to create.

Try itSign-in requiredUses your key

api.testingapis.com

curl 'https://api.testingapis.com/api/stream/sse/stock?count=3' \
  -H 'X-TestingApis-Key: YOUR_API_KEY'

const res = await fetch("https://api.testingapis.com/api/stream/sse/stock?count=3", {
  headers: {
    "X-TestingApis-Key": "YOUR_API_KEY",
  },
});
console.log(res.status, await res.text());

const res = await fetch("https://api.testingapis.com/api/stream/sse/stock?count=3", {
  headers: {
    "X-TestingApis-Key": "YOUR_API_KEY",
  },
});
const body: string = await res.text();
console.log(res.status, body);

import requests

res = requests.get(
    "https://api.testingapis.com/api/stream/sse/stock?count=3",
    headers={
        "X-TestingApis-Key": "YOUR_API_KEY",
    },
)
print(res.status_code, res.text)

using var client = new HttpClient();
using var request = new HttpRequestMessage(HttpMethod.Get, "https://api.testingapis.com/api/stream/sse/stock?count=3");
request.Headers.TryAddWithoutValidation("X-TestingApis-Key", "YOUR_API_KEY");
using var response = await client.SendAsync(request);
Console.WriteLine($"{(int)response.StatusCode} {await response.Content.ReadAsStringAsync()}");

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder(URI.create("https://api.testingapis.com/api/stream/sse/stock?count=3"))
                .header("X-TestingApis-Key", "YOUR_API_KEY")
                .GET()
                .build();
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println(response.statusCode() + " " + response.body());
    }
}

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, err := http.NewRequest("GET", "https://api.testingapis.com/api/stream/sse/stock?count=3", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("X-TestingApis-Key", "YOUR_API_KEY")
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, err := io.ReadAll(res.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println(res.StatusCode, string(data))
}

GEThttps://api.testingapis.com/api/stream/sse/stock?count=3

Query

countinteger (int32)

intervalinteger (int32)

Headers

The response is shown as it arrives.