bitfinex-lending-bot

bitfinex-lending-bot.py

import time
import base64
import json
import hmac
import hashlib
import requests

URL = 'https://api.bitfinex.com'
API_VERSION = '/v1'
API_KEY = ''
API_SECRET = ''

def _post(endpoint, payload=None):
    payload = payload or {}
    payload['request'] = API_VERSION + endpoint
    payload['nonce'] = str(int(time.time() * 1000))

    base64_payload = base64.b64encode(json.dumps(payload).encode())
    signature = hmac.new(API_SECRET.encode(), base64_payload, digestmod=hashlib.sha384)\
                    .hexdigest()
    signed_payload = {
        'X-BFX-APIKEY': API_KEY,
        'X-BFX-PAYLOAD': base64_payload,
        'X-BFX-SIGNATURE': signature
    }

    response = requests.post(URL + API_VERSION + endpoint, headers=signed_payload, timeout=10)
    if not response.ok:
        print(f'post {endpoint} failed')
        print(response.content)
        raise ValueError(response)

    return response.json()

def get_lend_rate(currency):
    # Get the past 2 hours average
    data = requests.get(f'https://api-pub.bitfinex.com/v2/candles/trade:15m:f{currency.upper()}:p15/hist?limit=8').json()
    ma8_ratio = sum(d[2] for d in data) / 8
    highest_ratio = max(d[3] for d in data)

    # Use the average of moving average and highest
    ratio = (ma8_ratio + highest_ratio) / 2 * 100
    ratio = max(ratio, 0.041)

    # v1 api use yearly raio, v2 use daily ratio
    return ratio * 365

def create_offer(currency, amount, rate, period):
    print(f'Lend {currency.upper()} {round(amount)}, {rate:.5}%, {period} days')
    return _post('/offer/new', {
        'currency': currency.upper(),
        'amount': str(int(amount)),
        'rate': str(rate),
        'period': period,
        'direction': 'lend'
    })

def cancel_offer(offer_id):
    print(f'Cancel offer {offer_id}')
    return _post('/offer/cancel', {
        'offer_id': offer_id
    })

def get_open_offers():
    return _post('/offers')

def get_period_by_rate(rate):
    if rate < 15:
        return 5
    elif rate < 20:
        return 10
    elif rate > 30:
        return 30
    return 20

def main():
    offers = get_open_offers()
    for offer in offers:
        cancel_offer(offer['id'])

    currency_pairs = _post('/balances')
    for currency_pair in currency_pairs:
        if currency_pair['type'] != 'deposit':
            continue
        if currency_pair['currency'] not in ['usd', 'ust']:
            continue
        currency = currency_pair['currency']
        amount = float(currency_pair['available'])
        if amount <= 50:
            continue

        rate = get_lend_rate(currency)
        period = get_period_by_rate(rate)
        create_offer(currency, amount, rate, period)

if __name__ == '__main__':
    main()