How to fetch Polygon (MATIC) Plasma Deposit History

Polygon Scan team is working on exposing endpoint, in the mean time you can use following methods.

1. Grab from HTML reponse from polygonscan site. (using RUBY for eg)

module Blockchain
  class MaticPlasmaDeposit
    def self.fetch(address = '0xffbc10d5520d549f36dd6f4774710e121d9ea1d1')
      doc = Nokogiri::HTML(URI.open("https://polygonscan.com/address-deposit?a=#{address}"))
      headers = %w[txn_hash timestamp age from type to amount token]
      # get table rows
      rows = []
      doc.xpath('//*/table/tbody/tr').each_with_index do |row, i|
        rows[i] = {}
        row.xpath('td').each_with_index do |td, j|
          rows[i][headers[j]] = td.text
        end
      end
      return [] if rows.empty?

      deposit_response_data(rows)
    end

    def self.deposit_response_data(rows)
      deposits = []
      rows.each do |row|
        deposits << {
          isError: '0',
          tokenSymbol: 'MATIC',
          tokenDecimal: 18,
          contractAddress: '',
          hash: row[:txn_hash],
          timeStamp: row[:timestamp],
          from: row[:from],
          to: row[:to],
        }
      end
      deposits
    end
  end
end

2. Use etherscan API

response = HTTParty.get('https://api.etherscan.io/api?module=account&action=tokentx&address=0xffbc10d5520d549f36dd6f4774710e121d9ea1d1&startblock=0&endblock=999999999&sort=asc')

from response only fetch data with contractAddress: 0x401f6c983ea34274ec46f84d70b31c151321188b which is Polygon's plasma bridge address.