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Blockscout External Transactions Lookup
x402
Blockscout External Transactions Lookup is a paid API for AI agents from api.blockscout.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-12).
Retrieves external (internal) transactions associated with a specific transaction hash on a given blockchain network via Blockscout's multichain explorer API
Price / call$0.002
Success—
StatusUnknown
How this service works
Explore crypto activities with Blockscout's multichain search. Find transactions, addresses, tokens, and dapps across top blockchain networks — your go-to explorer for cross-chain blockchain data
Output
A JSON array of external (internal) transaction records associated with the given transaction hash on the specified blockchain, including details such as value transfers, contract calls, and sub-transaction metadata generated by the top-level transaction.
Example use cases
DeFi trade sub-call inspection
“Show me all the external transactions that were triggered when this Uniswap swap happened — the tx hash is 0x4f3a...8c21 on Ethereum mainnet (chain ID 1).”
Smart contract audit trail
“I need to trace every external call spawned by transaction 0x9d2b...7e44 on Polygon (chain ID 137) to understand what contracts it touched.”
Cross-chain bridge transaction verification
“Can you fetch the external transactions for tx hash 0x1a7f...30bc on Arbitrum (chain ID 42161) so I can verify all the internal value transfers went through correctly?”
Technical details
Endpoint
GEThttps://api.blockscout.com/%7Bchain_id%7D/api/v2/transactions/%7Btransaction_hash_param%7D/external-transactionsWhen to prefer
Choose this endpoint when you need to inspect the internal/external sub-transactions spawned by a specific on-chain transaction across any of Blockscout's supported networks. It is ideal for tracing smart contract interactions, auditing DeFi operations, or verifying that all value transfers within a complex transaction executed correctly. Prefer this over generic block explorers when you need programmatic multichain access with a consistent API interface.
Side effects
- Invalid or unknown chain_id returns an error or empty result
- Malformed transaction hash returns a 400 or 422 validation error
- Transaction hash not found on the specified chain returns an empty array or 404
- Network timeout or Blockscout node unavailability returns a 5xx error
- Transaction has no external transactions, returning an empty array
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": [
"string"
]
}Tags
x402
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