New York Attorney General Eric T. Schneiderman has begun a probe of major cryptocurrency trading platforms as part of a broader effort to protect investors and consumers.

Under the auspices of its Virtual Markets Integrity Initiative, the AG’s office has sent letters to 13 virtual currency trading platforms requesting information about their operations, internal controls and safeguards to protect customer assets. Among the recipients are Coinbase (GDAX), Gemini Trust Company; bitFlyer USA, iFinex Inc. (Bitfinex) and Bitstamp USA.

“With cryptocurrency on the rise, consumers in New York and across the country have a right to transparency and accountability when they invest their money. Yet too often, consumers don’t have the basic facts they need to assess the fairness, integrity and security of these trading platforms,” said Schneiderman in a statement.

(Related: Congress May Need to Sort Out Crypto Regulation, SEC Chief Says)

He said the initiative aims to promote “the accountability and transparency in the virtual currency marketplace that investors and consumers deserve” and that enforcement agencies can use.

Cryptocurrency trading platforms currently often lack the basic protections of traditional investing platforms and can differ widely from one another, making it difficult for prospective users to evaluate their actual risks, according to Schneiderman.

(Related: SEC Halts Approvals of Cryptocurrency Funds)

He wants to see “robust disclosures” from these platforms that allow investors to assess the platform’s operations and the adequacy of its policies and internal controls, much like the disclosure that sophisticated investors routinely require of privately owned trading venues.

The questionnaires sent to the 13 platforms ask for information about ownership and control, basic operation and fees, trading policies and procedures, outages and other trading suspensions, internal controls and privacy and money laundering.

(Related: 6 Ways to Avoid a Cryptocurrency Stock Scam: FINRA)

They also ask the platforms to describe their approach to combating suspicious trading and market manipulation, their policies on bots, limitations on the use of and access to nonpublic trading information and the safeguards they have in place to protect customer funds from theft, fraud, and other risks. The AG’s office will present its findings to the public after it has analyzed the responses and compared them across platforms. The responses are due May 1.

(Related: Bitcoin: Gambling Vehicle or Portfolio Asset?)

In addition to the five exchanges listed above, the questionnaires were sent to Payward (Kraken), Bittrex, Circle Internet Financial Limited (Poloniex LLC), Binance Limited, Elite Way Developments LLP (Tidex.com),  Gate Technology Incorporated (Gate.io), itBit Trust Company and Huobi Global Limited (Huobi.Pro).