Because it (according to the above URL) requires node.js, I suggest we make it simple and change the both to Bitcoin Core or BlockTrail's BTC/tBTC explorer. Since an API key is still required for the latter, we could add a CW configuration setting for this Web API key.
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https://github.com/CounterpartyXCP/counterwallet/blob/master/src/js/components/history.js#L6 - it says here that BTC on History page can't be shown. We should consider enabling it, as testnet CW is very useful for troubleshooting.
In https://github.com/CounterpartyXCP/counterwallet/blob/master/src/js/components/history.js#L38 I see we use blockchain.info. I checked my history and it's not working. It could be this: http://bitcoin.stackexchange.com/questions/46766/cannot-check-balance-with-blockchain-info-api.
Because it (according to the above URL) requires node.js, I suggest we make it simple and change the both to Bitcoin Core or BlockTrail's BTC/tBTC explorer. Since an API key is still required for the latter, we could add a CW configuration setting for this Web API key.
Reference: https://www.blocktrail.com/api/docs/lang/jquery#api_data