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Base Transaction Explainer
x402
Base Transaction Explainer is a paid API for AI agents from agent-utils-x402.fishbowlinc.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-02).
Decodes and explains any Base mainnet transaction in plain English plus structured JSON, including status, fees, token transfers, approvals, swaps, and net balance changes
Price / call$0.005
Success—
StatusUnknown
How this service works
Explain any Base mainnet transaction in plain English plus structured JSON: status, method name, fee (L2+L1), decoded ERC-20/NFT transfers with token symbols and decimals, approvals (flags unlimited), swaps, wraps, EIP-3009 relays, and the sender's net token changes. Query: hash (0x + 64 hex).
Output
Returns a plain-English summary of what the transaction did plus structured JSON containing: success/fail status, the contract method name called, L1 and L2 gas fees, a list of decoded ERC-20 and NFT transfers with token symbols and decimals, token approvals with unlimited-flag detection, swap events, wrap/unwrap events, EIP-3009 relay metadata, and the sending address's net token balance changes across all involved assets.
Example use cases
Audit suspicious wallet approval
“I just saw this Base tx hash 0x4b8e1f2a9c3d7e5b6f2a8c4d9e1b3f7a5c2d8e4b6f9a1c3d7e5b2f4a8c6d1e9b — can you check if it granted an unlimited token approval to some contract and what the fee was?”
Explain DeFi swap to a user
“My user made this Base mainnet transaction 0x9d2f5a8c1e4b7f3a6d2e8c5b9f1a4d7e3b6c2f8a5d1e9b4c7f2a6d3e8b5c1f4a — can you explain exactly what swap happened, which tokens moved, and what it cost them in L1 and L2 fees?”
Verify NFT transfer completion
“Can you tell me whether this Base transaction 0x1c7a4e9f2b5d8c3a6f1e7b4d9c2a5f8e3b7d1c4a6f9e2b5c8d3a7f1e4b6d9c2a actually transferred the NFT and what the final status was?”
Technical details
Endpoint
GEThttps://agent-utils-x402.fishbowlinc.workers.dev/v1/base-tx?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a human-readable breakdown of a Base mainnet transaction with structured decoded data — including fees, token transfers, approvals, and net balance changes — without running your own RPC node or writing ABI decoding logic. Prefer it over raw RPC calls when the goal is to explain or audit a transaction to a user rather than query chain state programmatically.
Side effects
- Invalid tx hash format (must be 0x + 64 hex chars) returns 400 error
- Transaction not found on Base mainnet returns 404
- Non-Base (e.g. Ethereum mainnet or other L2) tx hashes return no results or error
- Payment not included or insufficient USDC ($0.005 required via x402) returns 402
- Rate limiting or Cloudflare Worker timeout on complex transactions
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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