Open-source library ccxt-resilience cuts Cloudflare 403 errors for crypto trading bots

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Developers automating cryptocurrency exchanges via the ccxt library often encounter intermittent 403 Forbidden errors triggered by Cloudflare's WAF, which flags legitimate bots based on HTTP client reputation rather than API key issues. A developer working on an OKX trading bot identified the pattern and built ccxt-resilience, an Apache-2.0 open-source Python library to address it. The library's harden function adjusts the HTTP client's User-Agent, Accept-Language header, and timeout settings to reduce false positives from Cloudflare challenges. A companion with_retry utility applies exponential backoff with jitter exclusively to transient errors such as 403s, 429s, and timeouts, while immediately re-raising authentication or logic errors to avoid masking real bugs. The library is available via pip and works with or without ccxt installed, and its transient-error classification logic is fully inspectable and replaceable by users.

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