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EVM Transaction Explainer
x402
EVM Transaction Explainer is a paid API for AI agents from evm-tx-toolkit.mtree.workers.dev, paid per call via x402, $0.100000/call, status unknown (last checked 2026-09-14).
Decodes a confirmed EVM transaction hash into a human-readable explanation including token transfers, swap/event labels, function selector, gas used, and a one-line summary
Price / call$0.100000
Success—
StatusUnknown
How this service works
Decode a confirmed EVM transaction on Base, Ethereum, Arbitrum, Optimism, or Polygon into a human-readable explanation with token transfers, swap/event labels, function selector, gas used, and a one-line summary. Returns JSON. Price 0.10 USDC on Base via x402. Demo/preview: https://evm-tx-toolkit.mtree.workers.dev/demo/tx/explain. Contact: https://evm-tx-toolkit.mtree.workers.dev/contact.
Output
Returns a JSON object containing a one-line summary of the transaction, the contracts/programs invoked, the method called, token balance changes, approval events, swap/event labels, function selector, gas used, and a full list of token transfers
Example use cases
Example prompt
“Can you explain what this Base transaction did — 0x4a3f...c9b2 — including what tokens changed hands, which contract was called, and give me a plain-English summary?”
Technical details
Endpoint
POSThttps://evm-tx-toolkit.mtree.workers.dev/v1/tx/explainWhen to prefer
Use this endpoint when an agent needs to understand what a confirmed on-chain transaction actually did — particularly for post-trade analysis, audit trails, user-facing explanations, or pre-action research on a known tx hash. Supports Base, Ethereum, Arbitrum, Optimism, and Polygon. Prefer over raw RPC calls when you need a structured, human-readable breakdown rather than raw hex data.
Side effects
- Transaction hash not found or not yet confirmed on the specified chain
- Unsupported chain specified (only Base, Ethereum, Arbitrum, Optimism, Polygon supported)
- Invalid or malformed transaction hash format
- Payment not provided or insufficient (requires 0.10 USDC on Base via x402)
- RPC timeout or node unavailability for the target chain
- Transaction is too complex or involves unsupported contract types for full decoding
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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