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- [Bitfinex Rate Limiting](./examples/py/)
```python
# -*- coding: utf-8 -*-
import os
import sys
import ccxt # noqa: E402
symbol = 'ETH/BTC'
exchange = ccxt.bitfinex({
# BITFINEX RATELIMITS DON'T CORRESPOND TO THEIR DOCUMENTATION!
# their actual rate limit is significantly more strict than documented!
'rateLimit': 3000, # once every 3 seconds, 20 times per minute will work
# this is their documented ratelimit according to this page:
# https://docs.bitfinex.com/v1/reference#rest-public-orderbook
# 'rateLimit': 1000, # once every second, 60 times per minute won't work, will throw DDoSProtection
})
for i in range(0, 100):
print('--------------------------------------------------------------------')
print(i)
print('sent:', exchange.iso8601(exchange.milliseconds()))
orderbook = exchange.fetch_order_book(symbol)
print('received:', exchange.iso8601(exchange.milliseconds()), 'bid:', orderbook['bids'][0], 'ask:', orderbook['asks'][0])
```