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OpenVerbs Chain Transaction Explainer
x402
OpenVerbs Chain Transaction Explainer is a paid API for AI agents from chain.openverbs.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-27).
Decodes an on-chain transaction hash into plain-language summary including transfer type, decoded method, ERC-20/NFT token movements, gas cost, and status
Price / call$0.006
Success—
StatusUnknown
Output
A plain-language explanation of the transaction including: the type (native ETH transfer, contract call, or contract creation), the decoded method name for common functions (transfer, approve, swap, mint, multicall, etc.), a list of ERC-20 and ERC-721 (NFT) token transfers triggered by the transaction with from/to/amount or tokenId, total gas spent in ETH, transaction status (success/failed/pending), and a concise one-line summary.
Example use cases
DeFi swap breakdown for user
“I just did a Uniswap swap on Ethereum and want to know exactly what happened — can you decode transaction 0xabc123...def456 and tell me what tokens were swapped, how much, and what the gas cost was?”
NFT mint verification
“Can you check this Base chain transaction 0xdead...beef and tell me if an NFT was minted, what token ID it got, and whether the transaction actually succeeded?”
Suspicious transfer investigation
“Someone sent me this Polygon transaction hash 0x1234...5678 — can you decode it and tell me in plain English what it did, what contracts or tokens were involved, and whether any ERC-20 tokens moved?”
Technical details
Endpoint
POSThttps://chain.openverbs.com/v1/explain?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a human-readable explanation of a specific transaction — especially for DeFi swaps, ERC-20 transfers, NFT mints, or contract calls — across Ethereum, Base, Arbitrum, Optimism, or Polygon. It is ideal when you want decoded method names, token movement details from logs, and a plain-language summary in a single call rather than stitching together raw RPC calls. Prefer sibling endpoints for raw tx data without explanation, or for block/address-level queries.
Side effects
- Invalid or malformed transaction hash returns validation error
- Transaction not found on the specified chain returns not-found error
- Unsupported chain name returns enum validation error
- Unrecognized contract method may return raw 4-byte selector instead of decoded name
- Pending transactions may have incomplete receipt data
- Network congestion or RPC fallback delays may increase latency
- Microtransaction fee of $0.006 USDC must be paid per call via x402 protocol
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hash | string | 32-byte transaction hash. |
| chain | string | EVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default "ethereum". |
Tags
x402
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