How to use BitFlyer's API?

BitFlyer's API empowers traders and developers to automate trading or integrate services, guiding users from account setup to executing trades programmatically.

Apr 16, 2025 at 04:42 am

Using BitFlyer's API can be a powerful tool for traders and developers looking to automate their trading strategies or integrate BitFlyer's services into their applications. In this article, we will guide you through the process of using BitFlyer's API, from setting up an account to executing trades programmatically.

Registering and Setting Up Your BitFlyer Account

Before you can use BitFlyer's API, you need to have an account with BitFlyer. Here are the steps to get started:

• Visit the BitFlyer website and click on the "Sign Up" button.
• Fill out the registration form with your personal information, including your name, email address, and password.
• Complete the verification process, which may involve providing identification documents.
• Once your account is verified, log in to your BitFlyer account.

Obtaining API Keys

To use BitFlyer's API, you need to generate API keys. Here's how to do it:

• Log in to your BitFlyer account and navigate to the "API" section.
• Click on "Create New API Key".
• Enter a name for your API key to help you remember its purpose.
• Choose the permissions you want to grant to this API key. For trading, you will need to select "Trade" and "Withdraw".
• Confirm the creation of the API key and securely store the API Key and API Secret. These will be used to authenticate your API requests.

Understanding BitFlyer's API Endpoints

BitFlyer's API is divided into several endpoints that serve different purposes. Here are the main categories:

• Public Endpoints: These do not require authentication and are used to fetch market data, such as ticker information, order books, and trade history.
• Private Endpoints: These require authentication and are used for actions like placing orders, checking your balance, and managing your account.

Making API Requests

To interact with BitFlyer's API, you will need to send HTTP requests to the appropriate endpoints. Here's a basic guide on how to do this:

• Choose an HTTP client: You can use tools like cURL, Python's requests library, or any other HTTP client that supports sending requests.
• Construct the API URL: The base URL for BitFlyer's API is https://api.bitflyer.com/v1/. Append the specific endpoint to this base URL. For example, to get the ticker information, you would use https://api.bitflyer.com/v1/ticker.
• Add Authentication (for private endpoints): For private endpoints, you need to add authentication headers. Use the API Key and API Secret to generate a signature and include it in the ACCESS-SIGN header. Here's a basic example using Python:

import hmac
import hashlib
import time
import requests
api_key = 'YOUR_API_KEY'
api_secret = 'YOUR_API_SECRET'
timestamp = str(int(time.time()))
method = 'GET'
endpoint = '/v1/me/getbalance'
uri_path = '/v1' + endpoint
text = timestamp + method + uri_path
sign = hmac.new(bytes(api_secret.encode('ascii')), bytes(text.encode('ascii')), hashlib.sha256).hexdigest()
headers = {
'ACCESS-KEY': api_key,
'ACCESS-TIMESTAMP': timestamp,
'ACCESS-SIGN': sign,
'Content-Type': 'application/json'
}
response = requests.request(method, 'https://api.bitflyer.com' + uri_path, headers=headers)
print(response.json())

Placing Orders Using the API

To place an order using BitFlyer's API, you need to use the private endpoint for sending orders. Here's how to do it:

• Choose the order type: BitFlyer supports various order types, such as market orders, limit orders, and stop orders.
• Prepare the order data: You will need to specify the product code (e.g., 'BTC_JPY'), the order type, and other relevant parameters like price and quantity.
• Send the order request: Use the /v1/me/sendchildorder endpoint to place the order. Here's an example using Python:

import hmac
import hashlib
import time
import requests
import json
api_key = 'YOUR_API_KEY'
api_secret = 'YOUR_API_SECRET'
timestamp = str(int(time.time()))
method = 'POST'
endpoint = '/v1/me/sendchildorder'
uri_path = '/v1' + endpoint
order_data = {
'product_code': 'BTC_JPY',
'child_order_type': 'LIMIT',
'side': 'BUY',
'price': 5000000,
'size': 0.01
}
body = json.dumps(order_data)
text = timestamp + method + uri_path + body
sign = hmac.new(bytes(api_secret.encode('ascii')), bytes(text.encode('ascii')), hashlib.sha256).hexdigest()
headers = {
'ACCESS-KEY': api_key,
'ACCESS-TIMESTAMP': timestamp,
'ACCESS-SIGN': sign,
'Content-Type': 'application/json'
}
response = requests.request(method, 'https://api.bitflyer.com' + uri_path, headers=headers, data=body)
print(response.json())

Managing Your Orders

Once you have placed orders, you may need to manage them, such as canceling orders or checking their status. Here's how to do it:

• Canceling an Order: Use the /v1/me/cancelchildorder endpoint. You will need to specify the product code and the order ID or the parameters used to place the order.

import hmac
import hashlib
import time
import requests
import json
api_key = 'YOUR_API_KEY'
api_secret = 'YOUR_API_SECRET'
timestamp = str(int(time.time()))
method = 'POST'
endpoint = '/v1/me/cancelchildorder'
uri_path = '/v1' + endpoint
cancel_data = {
'product_code': 'BTC_JPY',
'child_order_acceptance_id': 'YOUR_ORDER_ID'
}
body = json.dumps(cancel_data)
text = timestamp + method + uri_path + body
sign = hmac.new(bytes(api_secret.encode('ascii')), bytes(text.encode('ascii')), hashlib.sha256).hexdigest()
headers = {
'ACCESS-KEY': api_key,
'ACCESS-TIMESTAMP': timestamp,
'ACCESS-SIGN': sign,
'Content-Type': 'application/json'
}
response = requests.request(method, 'https://api.bitflyer.com' + uri_path, headers=headers, data=body)
print(response.json())

• Checking Order Status: Use the /v1/me/getchildorders endpoint to fetch the status of your orders.

import hmac
import hashlib
import time
import requests
api_key = 'YOUR_API_KEY'
api_secret = 'YOUR_API_SECRET'
timestamp = str(int(time.time()))
method = 'GET'
endpoint = '/v1/me/getchildorders'
uri_path = '/v1' + endpoint
params = {
'product_code': 'BTC_JPY',
'child_order_state': 'ACTIVE'
}
text = timestamp + method + uri_path + '?' + '&'.join([f'{k}={v}' for k, v in params.items()])
sign = hmac.new(bytes(api_secret.encode('ascii')), bytes(text.encode('ascii')), hashlib.sha256).hexdigest()
headers = {
'ACCESS-KEY': api_key,
'ACCESS-TIMESTAMP': timestamp,
'ACCESS-SIGN': sign,
'Content-Type': 'application/json'
}
response = requests.request(method, 'https://api.bitflyer.com' + uri_path, headers=headers, params=params)
print(response.json())

Frequently Asked Questions

Q: Can I use BitFlyer's API on different programming languages?

A: Yes, BitFlyer's API can be used with various programming languages. You need an HTTP client library that supports sending requests and handling authentication. Examples include Python's requests library, JavaScript's axios, and many others.

Q: Is there a limit to the number of API requests I can make?

A: Yes, BitFlyer has rate limits on their API to prevent abuse. The exact limits may vary, so it's important to check BitFlyer's documentation for the most current information. Exceeding these limits may result in temporary bans or restrictions on your account.

Q: How secure is it to use BitFlyer's API?

A: Using BitFlyer's API is secure as long as you follow best practices for API security. Always keep your API keys and secrets confidential, use HTTPS for all communications, and implement proper error handling and logging to monitor for suspicious activity.

Q: Can I use BitFlyer's API for automated trading strategies?

A: Yes, BitFlyer's API is designed to support automated trading strategies. You can use it to fetch market data, place orders, and manage your positions programmatically, allowing you to implement complex trading algorithms and bots.