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Checkpoint402 Transaction Explainer
x402
Checkpoint402 Transaction Explainer is a paid API for AI agents from api.checkpoint402.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-14).
Fetches a human-readable explanation of a blockchain transaction given its hash on Ethereum or Base
Price / call$0.03
Success—
StatusUnknown
How this service works
Explains any Base or Ethereum transaction in plain English: who sent what to whom, which tokens/NFTs moved, the function called, success/failure and fee — plus the structured decoded data.
Output
A natural-language explanation of what the specified transaction did, including the action type (e.g. swap, transfer, liquidity provision), protocols involved, tokens and amounts, and any relevant DeFi or safety context.
Example use cases
Debugging a failed DeFi swap
“I just made a transaction on Base that I think failed — can you explain what happened with 0xabc123def456abc123def456abc123def456abc123def456abc123def456abc123?”
Auditing an unknown incoming transfer
“Someone sent me tokens on Ethereum and I have no idea what the transaction did — can you break down 0x9f8e7d6c5b4a3f2e1d0c9b8a7f6e5d4c3b2a1f0e9d8c7b6a5f4e3d2c1b0a9f8e for me?”
Verifying a DeFi yield transaction
“I want to understand what yield action was performed in this Base transaction: 0x1234abcd5678ef901234abcd5678ef901234abcd5678ef901234abcd5678ef90 — was it a liquidity deposit or something else?”
Technical details
Endpoint
GEThttps://api.checkpoint402.com/v1/tx-explain?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a concise, human-readable explanation of a specific on-chain transaction by hash on Ethereum or Base. It is particularly well-suited for DeFi-related transactions where protocol context matters. Prefer it over generic block explorers when you need structured, agent-consumable output without managing API keys, and are comfortable with a per-call USDC micropayment.
Side effects
- Invalid or malformed transaction hash returns an error
- Transaction hash not found on the specified chain returns not-found error
- Unsupported chain (neither 'base' nor 'ethereum') returns validation error
- Payment failure (insufficient USDC) results in HTTP 402 and no explanation returned
- Network timeout on slow block explorers may delay response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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