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- Found a short PDF that documents what appears to be a persistent pricing inconsistency on Changelly when using Bitcoin as the source asset in a swap.
- It seems that when an older, deprecated Node.js backend (v1.9) is manually injected through the browser console, the exchange interface begins quoting significantly higher-than-expected amounts in the destination currency — typically around 27% more than the current market rate.
- For example:
- Swapping the equivalent of $1000 in BTC would normally return ~$1000 worth of ETH (or other altcoins),
- but with the legacy node active, the quoted return jumps to around $1270, effectively creating a one-sided gain in value.
- This discrepancy doesn’t affect other input currencies — it seems to be specific to BTC as the base asset.
- Once the swap is completed and the altcoin received, the funds can, in theory, be exchanged back into BTC, allowing for the process to be repeated in a loop (although the exact profitability per iteration would vary depending on fees and timing).
- The full explanation, including the script used to load the older backend and a working example, is documented in this write-up:
- 📄 PDF: docs.google.com/document/d/1mbfHb_apWiKICtwTjtRxUzyHQX2w2wuWjvOAhX5GYOM/edit?usp=sharing
- Posting for informational and archival purposes — surprised this hasn’t been patched, considering the backend is officially deprecated.
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