> ## Documentation Index
> Fetch the complete documentation index at: https://docs.relay.link/llms.txt
> Use this file to discover all available pages before exploring further.

# Attest Deposit

> Attest a deposit transaction so its funds become claimable via the withdrawal flow

[How do programmatic withdrawals work?](/references/protocol/guides/withdrawals)

<Note>
  Unlike the other withdrawal endpoints, `chainId` here is the numeric Relay chain id. These endpoints power [relay.link/withdraw](https://relay.link/withdraw) and are not yet a versioned API surface.
</Note>


## OpenAPI

````yaml post /withdrawals/attest-deposit
openapi: 3.0.3
info:
  title: Cross-chain solver
  version: 1.0.0
servers:
  - url: https://api.relay.link
    description: Mainnet API
  - url: https://api.testnets.relay.link
    description: Testnet API
security: []
paths:
  /withdrawals/attest-deposit:
    post:
      requestBody:
        content:
          application/json:
            schema:
              type: object
              required:
                - chainId
                - transactionId
              properties:
                chainId:
                  type: number
                transactionId:
                  type: string
        required: true
      responses:
        '200':
          description: Default Response

````