Rails 7 paginate without sending API request - ruby-on-rails

Question

In my Rails 7 app I want to display transactions inside data table. because I expect there will be hundreds of them, I'm using pagy gem to paginate the result. Table data comes from client API request. As a response I get an array of hashes from which I extract data.
Here is my code:
Controller where I've made a request:
# transactions_controller.rb
class TransactionsController < ApplicationController
def index
response = client.transactions.list(platform_id: current_user.platform_id, page: 1, per_page: 100)
#transactions = response.body['data']
end
private
def client
#client ||= TestAPI::Client.new
end
end
Corresponding view:
#views/transactions/index.html.erb
<table class="table table-striped">
<thead>
<tr>
<b>
<tr>
<th>Date</th>
<th>Amount</th>
</tr>
</b>
</tr>
</thead>
<tbody>
<% #transactions.map do |transaction| %>
<tr>
<td>
<%= transaction['created_at'] %>
</td>
<td>
<%= transaction['amount_cents'] %>
</td>
</tr>
<% end %>
</tbody>
</table>
<%== pagy_bootstrap_nav(#pagy) %>
The pagination works well how to set it up without reloading the page? now when I use binding.pry in the controller to check if the request to the API was made, like below:
def index
response = client.transactions.list(platform_id: current_user.platform_id, page: 1, per_page: 100)
binding.pry
(...)
With each transition between pagination pages, a request is sent to the external API. How to send a request just once and operate on a single response?
[EDIT]
Controller with Low-Level Caching:
class TransactionsController < ApplicationController
def index
#pagy, #transactions = pagy_array(cashed_transactions.body['data'], items: 8)
end
private
def cashed_transactions
Rails.cache.fetch("merchants/#{current_user.platform_merchant_id}/transactions", expires_in: 12.hours) do
client.transactions.list(platform_merchant_id: current_user.platform_merchant_id, page: 1, per_page: 100)
end
end
end
Client API to get list of transactions:
def list(platform_merchant_id:, page: nil, per_page: nil, status: nil, platform_payment_id: nil)
filters = { 'filters[status]': status, 'filters[platform_payment_id]': platform_payment_id }.compact
params = { filters:, page:, per_page: }.compact
get("merchants/#{platform_merchant_id}/transactions", params:)
end