curl --request GET \
  --url https://api.developer.coinbase.com/onramp/v1/buy/options \
  --header 'Authorization: Bearer <token>'

{
  "payment_currencies": [
    {
      "id": "<string>",
      "limits": [
        {
          "id": "UNSPECIFIED",
          "max": "<string>",
          "min": "<string>"
        }
      ]
    }
  ],
  "purchase_currencies": [
    {
      "icon_url": "<string>",
      "id": "<string>",
      "name": "<string>",
      "networks": [
        {
          "chain_id": 123,
          "contract_address": "<string>",
          "display_name": "<string>",
          "name": "<string>"
        }
      ],
      "symbol": "<string>"
    }
  ]
}