TxSim Decoder

Pay-per-call EVM transaction simulation and calldata decoder for AI agents: decode raw calldata into a named function with security risk flags, and run a keyless eth_call preview to see whether a transaction would succeed or revert before signing. Across Base, Ethereum, Arbitrum, Optimism, Polygon, BSC. No API keys, no node infra: one x402 USDC micropayment per call.

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