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SperaxOS Contract Explorer - Decode Transaction
x402
SperaxOS Contract Explorer - Decode Transaction is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Decodes a blockchain transaction hash into human-readable function calls, parameters, and event logs using AI-powered DeFi intelligence
Price / call$0.005
Success—
StatusUnknown
How this service works
AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.
Output
Returns a decoded breakdown of the blockchain transaction including the contract method name, decoded input parameters with their types and values, and any emitted event logs — presented in human-readable form rather than raw hex calldata.
Example use cases
DeFi trade investigation
“I got a transaction hash from a Uniswap trade on Ethereum — 0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b — can you decode it and tell me exactly what swap was executed and what amounts were involved?”
Suspicious wallet activity review
“Can you decode this Arbitrum transaction 0xdeadbeef1234567890abcdef1234567890abcdef1234567890abcdef12345678 and explain what contract was called and what it actually did? I'm trying to audit a wallet's activity.”
Smart contract debugging
“I deployed a contract on Polygon and this transaction 0xabc123def456abc123def456abc123def456abc123def456abc123def456abc123 failed — decode it for me so I can see what function was being called and what parameters were passed in.”
Technical details
Endpoint
POSThttps://chat.sperax.io/api/x402/tools/contract-explorer/decodeTransaction?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to decode a specific on-chain transaction into human-readable form across major EVM chains (Ethereum, Base, Arbitrum, Polygon, Optimism, Avalanche, BSC). It is ideal for DeFi agents auditing wallet activity, debugging smart contract interactions, or explaining transaction behavior to end users. Prefer this over generic block explorers when you need programmatic, AI-interpreted output rather than raw data.
Side effects
- Invalid or malformed transaction hash returns an error
- Transaction hash not found on the specified chain
- Unsupported chain name causes a validation error
- Unverified or non-standard contract ABI may result in partial or failed decoding
- Network timeout if the chain RPC is slow or unavailable
- Payment failure via x402 protocol blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Chain name: ethereum, arbitrum, polygon, base, optimism, avalanche, bsc. Defaults to ethereum. |
| txHash | string | Transaction hash (0x…) |
Tags
x402
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