require 'rubygems'
require 'bundler'
require 'buttercms-ruby'

ButterCMS::api_token = 'your_token'

class App < Sinatra::Base
  get '/blog' do
    params[:page] ||= 1

    @posts = ButterCMS::Post.all(:page => params[:page], :page_size => 10)
    @next_page = @posts.meta.next_page
    @prev_page = @posts.meta.previous_page

    erb :index
  end
end

<h2>Posts</h2>

<!-- List of posts -->
<% @posts.each do |post| %>
  <a href="<%= url("/blog/#{post.slug}") %>"><%= post.title %></a>
  <br>
<% end %>

<!-- Pagination links -->
<div>
  <% if @previous_page %>
  <a href="<%= url("/blog?page=#{@prev_page}") %>">Prev</a>
  <% end %>

  <% if @next_page %>
  <a href="<%= url("/blog?page=#{@next_page}") %>">Next</a>
  <% end %>
</div>

class App < Sinatra::Base

  ...

  get '/blog/:slug' do
    @post = ButterCMS::Post.find(params[:slug])

    erb :post
  end
end

<% content_for(:title) { @post.seo_title } %>
<% content_for(:meta_description) { @post.meta_description } %>

<!-- Post title -->
<h2><%= @post.title %></h2>

<!-- Post author -->
<a href="<%= url("/author/#{@post.author.slug}") %>"><%= "#{@post.author.first_name} #{@post.author.last_name}" %></a>

<!-- Post categories -->
<% @post.categories.each do |category| %>
  <a href="<%= url("/category/#{category.slug}") %>"><%= category.name %></a>
<% end %>

<!-- Publish date -->
<%= @post.published %>

<!-- Post body -->
<%= @post.body %>