curl --request GET \
  --url https://mainnet.mirrornode.hedera.com/api/v1/accounts/{idOrAliasOrEvmAddress}/airdrops/outstanding

{
  "airdrops": [
    {
      "amount": 10,
      "receiver_id": "0.0.15",
      "sender_id": "0.0.10",
      "serial_number": null,
      "timestamp": {
        "from": "1651560386.060890949",
        "to": "1651560386.661997287"
      },
      "token_id": "0.0.99"
    }
  ],
  "links": {
    "next": null
  }
}