Blockchair API 对于每个 API 请求都有一个请求配额的限制，超出限制后会返回 429 错误。解决方法是使用请求速率限制实现限制 API 请求频率，避免请求配额的限制。以下是一个例子：

import time
import requests

API_KEY = "your_api_key"

def rate_limited(max_per_day, interval_secs):
    """Decorator that slows down a function to comply with rate limit."""
    min_interval = interval_secs / float(max_per_day)
    last_time_called = [0.0]
    def decorator(func):
        def wrapper(*args, **kargs):
            elapsed = time.clock() - last_time_called[0]
            left_to_wait = min_interval - elapsed
            if left_to_wait > 0:
                time.sleep(left_to_wait)
            result = func(*args, **kargs)
            last_time_called[0] = time.clock()
            return result
        return wrapper
    return decorator

@rate_limited(max_per_day=500, interval_secs=86400)
def get_transactions(address, api_key):
    url = f"https://api.blockchair.com/bitcoin/dashboards/address/{address}?key={api_key}"
    response = requests.get(url)
    data = response.json()
    transactions = data["data"][address]["transactions"]
    return transactions

transactions = get_transactions("1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa", API_KEY)
print(transactions)

以上是一个用于获取比特币地址交易信息的示例代码。该代码使用装饰器实现了每天最多 500 次 API 请求限制，并将 API 请求间隔限制为一天。使用时需要将 API_KEY 替换为自己的 API 密钥。