curl --request POST \
  --url https://api.agg.market/users/me/external-id \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-app-id: <api-key>' \
  --data '
{
  "externalId": "<string>",
  "timestamp": 1,
  "hmac": "<string>"
}
'

{
  "id": "<string>",
  "username": "<string>",
  "avatarUrl": "<string>",
  "externalId": "<string>",
  "accounts": [
    {
      "type": "oauth",
      "provider": "wallet",
      "providerAccountId": "<string>"
    }
  ],
  "wallets": [
    {
      "chain": "evm",
      "address": "<string>"
    }
  ]
}