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POST /v1/accounts
Creates a new Ledger account and returns its USDC deposit address. Response 201 Created 
{
  "accountId": "acc_8f3a...",
  "depositAddress": "0xC0FFEE...",
  "depositChains": ["base", "ethereum", "polygon"],
  "createdAt": "2026-05-06T12:00:00Z"
}
The same depositAddress accepts native USDC on all listed chains (EVM-compatible). Deposits are swept internally to Base as the canonical chain via Circle CCTP V2.