Workers to add

[ashishbhate]

List of APIs to integrate. Make a separate issue for each one when starting implementation:

1. https://www.blockcypher.com/dev/bitcoin/#rate-limits-and-tokens

https://api.blockcypher.com/v1/btc/main/addrs/1FeexV6bAHb8ybZjqQMjJrcCrHGW9sb6uF/balance

2. https://chainflyer.bitflyer.jp/API/docs

https://chainflyer.bitflyer.jp/v1/address/1FeexV6bAHb8ybZjqQMjJrcCrHGW9sb6uF

3. https://insight.bitpay.com/

https://insight.bitpay.com/api/addr/1NcXPMRaanz43b1kokpPuYDdk6GGDvxT2T/?noTxList=1

4. https://btc.com/api-doc#Address

https://chain.api.btc.com/v3/address/3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r,1FeexV6bAHb8ybZjqQMjJrcCrHGW9sb6uF

5. https://bitcoinchain.com/api#api_blockchain

https://api-r.bitcoinchain.com/v1/address/1FeexV6bAHb8ybZjqQMjJrcCrHGW9sb6uF

6. https://blockexplorer.com/api-ref

https://blockexplorer.com/api/addr/3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r/balance

7. https://www.blockchain.com/api/q

https://blockchain.info/q/addressbalance/3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r

8. https://www.blockchain.com/btc/address/3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r

https://blockchain.info/q/addressbalance/3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r?confirmations=6

9. https://jsapi.apiary.io/apis/blockchaininfo/reference/simple-address-lookups/address-balance/get.html