Developer shares 5 hard-learned fixes for building DeFi bots on free-tier APIs

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A developer building two Ethereum monitoring bots on free-tier infrastructure documented five recurring errors and their practical solutions. Key issues included unreliable WebSocket listeners that silently disconnected, CoinGecko rate-limit errors triggered by polling too many tokens too frequently, and a Supabase row-level security policy that silently blocked all data writes. Additional problems arose from file creation failures in Termux and getting trapped inside tmux sessions on a mobile keyboard. The overarching lesson was that free-tier and mobile setups demand reduced scope and simpler tooling rather than real-time or feature-heavy approaches.

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