Open-source MCP Server Decodes Base Transactions without LLM, Zero Hallucinations
polaris0028 · reddit · 2026-08-20
The author released an MCP server that decodes Base on-chain transactions deterministically without using any LLMs in the response path. By leveraging 40 built-in event decoders and verified ABIs from Sourcify, the tool accepts a transaction hash and returns structured JSON containing a summary, action type, asset movements, counterparties, risk flags (e.g., unlimited approvals, known drainers), and gas costs. This mechanical approach saves tokens and prevents hallucinations, allowing agents to reason over high-level data instead of raw logs. Validated against 100 random transactions, it achieved a 95% specific classification rate. Pricing is set at 10 free calls per client, then $0.02/call via the x402 protocol.
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