anchor/ts/packages/spl-memo/idl.json

{
  "version": "3.0.1",
  "name": "spl_memo",
  "instructions": [
    {
      "name": "addMemo",
      "accounts": [],
      "args": [
        {
          "name": "memo",
          "type": "string"
        }
      ]
    }
  ]
}