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Blockscout Arbitrum Message Claim Data Lookup
x402
Blockscout Arbitrum Message Claim Data 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 the calldata and outbox address hash needed to claim a specific Arbitrum cross-chain message by message ID and chain
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
Returns a JSON object containing the raw calldata string needed to execute the claim transaction and the outbox_address_hash (the Arbitrum outbox contract address) associated with the specified message ID on the given chain.
Example use cases
Claiming an Arbitrum L2-to-L1 withdrawal
“I withdrew ETH from Arbitrum to Ethereum mainnet and I need the calldata to claim message ID 1087 on chain 42161 — can you fetch that from Blockscout?”
Automating cross-chain bridge monitoring
“For our bridge bot, fetch the outbox address and calldata for Arbitrum message ID 305 on chain 42161 so we can automatically submit the claim transaction.”
Debugging a failed Arbitrum message claim
“Our Arbitrum withdrawal for message ID 88 on chain 42161 isn't going through — can you pull the raw calldata and outbox address from Blockscout so we can inspect what's wrong?”
Technical details
Endpoint
GEThttps://api.blockscout.com/%7Bchain_id%7D/api/v2/arbitrum/messages/claim/%7Bmessage_id%7DWhen to prefer
Choose this endpoint when you need the exact calldata and outbox address to claim a specific Arbitrum cross-chain message on L1. It is purpose-built for Arbitrum L2-to-L1 message finalization, unlike generic block explorers. Use it over manual RPC calls when you need structured, pre-formatted claim data without constructing raw contract calls yourself.
Side effects
- Invalid or unknown message_id returns an empty or error response
- Invalid chain_id results in a 404 or unsupported chain error
- Message not yet claimable (still in challenge period) may return incomplete data
- Malformed path parameters return a 400 or validation error
- Network timeout if the Blockscout node is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"calldata": "string",
"outbox_address_hash": "string"
}
}Tags
x402
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