Balance

Get eSIM balance

Experimental. This endpoint is still settling — its request and response shape may change without a deprecation cycle.

Returns the latest stored balance. Amounts use integer minor currency units.

get/profiles/{profileReference}/esims/{esimReference}/balance

Authorization

Authorization: Bearer {token} — an OAuth2 access token from the client-credentials flow. How authentication works

Path parameters

profileReferencestringrequired

The eSIM's profile reference (16-digit numeric string)

esimReferencestringrequired

eSIM reference identifier (18-digit opaque token)

Responses

200Current balanceapplication/json

Show response body

dataobjectrequired

Show properties

profileReferencestringrequired

esimReferencestringrequired

currencystringrequired

Three-letter ISO 4217 currency code

balanceintegerrequired

Current balance in integer minor currency units

updatedAtstring · date-timerequired

400Bad request - invalid parameters 401Unauthorized - missing or invalid API key 403Forbidden - client does not have access to this resource 404Resource not found 422Request cannot be applied to the current resource 429Rate limit exceeded 500Internal server error

Request

curl 'https://connect.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance' \
  --header 'Authorization: Bearer YOUR_ACCESS_TOKEN'

fetch('https://connect.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance', {
  headers: {
    Authorization: 'Bearer YOUR_ACCESS_TOKEN'
  }
})

requests.get(
    "https://connect.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance",
    headers={
      "Authorization": "Bearer YOUR_ACCESS_TOKEN"
    }
)

$client = new GuzzleHttp\Client();

$response = $client->request('GET', 'https://connect.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance', [
  'headers' => [
    'Authorization' => 'Bearer YOUR_ACCESS_TOKEN'
  ]
]);

package main

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

func main() {
	requestUrl := "https://connect.firsty.app/api/v3/profiles/%7BprofileReference%7D/esims/%7BesimReference%7D/balance"

	req, _ := http.NewRequest("GET", requestUrl, nil)

	req.Header.Add("Authorization", "Bearer YOUR_ACCESS_TOKEN")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}

curl 'https://connect.test.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance' \
  --header 'Authorization: Bearer YOUR_ACCESS_TOKEN'

fetch('https://connect.test.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance', {
  headers: {
    Authorization: 'Bearer YOUR_ACCESS_TOKEN'
  }
})

requests.get(
    "https://connect.test.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance",
    headers={
      "Authorization": "Bearer YOUR_ACCESS_TOKEN"
    }
)

$client = new GuzzleHttp\Client();

$response = $client->request('GET', 'https://connect.test.firsty.app/api/v3/profiles/{profileReference}/esims/{esimReference}/balance', [
  'headers' => [
    'Authorization' => 'Bearer YOUR_ACCESS_TOKEN'
  ]
]);

package main

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

func main() {
	requestUrl := "https://connect.test.firsty.app/api/v3/profiles/%7BprofileReference%7D/esims/%7BesimReference%7D/balance"

	req, _ := http.NewRequest("GET", requestUrl, nil)

	req.Header.Add("Authorization", "Bearer YOUR_ACCESS_TOKEN")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}

Response

{
  "data": {
    "profileReference": "1234567890123456",
    "esimReference": "123456000000000001",
    "currency": "EUR",
    "balance": 1500,
    "updatedAt": "2026-01-15T09:30:00Z"
  }
}

{
  "type": "https://developers.firsty.app/errors/validation-failed",
  "title": "Validation failed",
  "status": 400,
  "detail": "Request contains invalid fields",
  "errors": [
    {
      "field": "planReference",
      "detail": "Must be a valid 14-character plan reference"
    }
  ]
}