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Give {chain, to?, data, abi?}; get the 4-byte selector resolved to a function signature (via provided ABI, the verified contract source, or 4byte.directory) plus fully decoded, typed arguments (tuples/arrays/nested included). Without payment returns the x402 challenge.","inputSchema":{"$schema":"http://json-schema.org/draft-07/schema#","additionalProperties":false,"properties":{"abi":{"anyOf":[{"type":"array"},{"type":"string"}],"description":"Optional contract ABI (JSON array or JSON string). 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