---
title: "Get claim data for a withdrawal."
method: GET
path: "/{chain_id}/api/v2/arbitrum/messages/claim/{message_id}"
tags: ["arbitrum"]
---

# Get claim data for a withdrawal.

`GET /{chain_id}/api/v2/arbitrum/messages/claim/{message_id}`

Returns the ABI-encoded calldata and outbox contract address required to execute a Rollup withdrawal on the Parent chain.

## Path parameters

- `message_id` integer, required
- `chain_id` string, required

## Response `200`

Claim data for the withdrawal.

- ArbitrumClaimMessage — Calldata and outbox contract address needed to execute a withdrawal on the Parent chain.
  - `calldata` string, required — ABI-encoded calldata for the executeTransaction call.
  - `outbox_address_hash` string, required — Address of the Arbitrum Outbox contract on the Parent chain through which the withdrawal is executed.

## Other responses

- `400` — Withdrawal cannot be claimed. Returned when the withdrawal is unconfirmed, just initiated, or already executed.
- `404` — Not Found
- `422` — Unprocessable Entity

---

[API](https://skmtc.dev/blockscout/apis/blockscout-pro-api.md) · [All operations](https://skmtc.dev/blockscout/apis/blockscout-pro-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/blockscout/blockscout-pro-api/revisions/59ac5466233b/schema)