After importing my Maid’s into omniwallet ready to be burnt I discovered I also had some bitcoin in there that had increased in value a fair bit over the years. I am wanting to send it to Bitmart to buy some ANTS but I get this message when entering the BTC receive address provided by Bitmart: “Please enter a valid Bitcoin address that supports the Omni Protocol token you are sending”. I’m confused as I’m trying to send BTC not an omni token. Any help would be greatly appreciated 
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Are you selecting BTC as the asset to send? That is the only suggestion I can offer.
The other thing is to import the private key into another wallet so you can send it.
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It’s likely because Omni uses old Bitcoin standards for sending, and hasn’t been updated to recognise more recent Bitcoin address formats.
I had a similar problem with Omniwallet recently. I solved it by opening the private key for that address in Electrum wallet, which I downloaded, and sent the BTC from there to the new format BTC address.
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I managed to send btc from omniwallet to Coinbase a few weeks ago without any hassle
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You have 2 options. First is the one neo suggested. The second one is to send the bitcoin out to a wallet that can accept and send both old and new addresses. Example: bitcoin core, or send to an exchange that can accept old addresses like kraken. And then from there send again to bitmart.
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Thanks everyone for your help! @Matt I was able to send the BTC to coinbase. Legends
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The other suggestion would’ve been to import private key into a wallet that supports older and new standards, such as Blue Wallet (highly recommend).
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Same exact thing just happened to me over the weekend and Coinbase was my out too.
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I had several low balance addresses on Omni and did this to conolidate them to a hardware wallet in one go. 
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