We have up a beta version of our gateway/bridge where you can convert from bitcoin and bitassets now. Please test with only small quantities for now. It's here: http://blocktrades.us
Yes, finally a gateway! Why the duplication of effort for the bridge part (BTC to BitAssets/BTS) with metaexchange.info? I feel like there is already too much duplication of coding effort going on (the bridge part of blocktrades.us with metaexchange.info, the mobile wallets of ElMato's bitwallet, Bitsapphire's Moonstone, Nathan's light wallet, and one can even argue James Calfee's web wallet). I know there are various differences between the clients, but still when we have so little developer resources for the BitShares ecosystem as a whole, I get very concerned with inefficiencies coming from duplication of effort.
Have you thought about implementing a multisig solution for protecting the reserves of the gateway in an easy to use daemon that can be deployed by some trusted third parties (e.g. a subset of the delegates)?
Why are the spreads so outrageously high for your btc IOU? you should set them really low to attract liquidity, especially in the beginning.
At the very least the spreads between TRADE.BTC and BTC and the spreads between TRADE.LTC and LTC should be very small since you are not exposed to any volatility risk at all (you only need to pay the BitShares and Bitcoin transaction fees and of course run the server daemons). You could even implement a minimum fixed fee in case the exchange quantity is so small that the percentage spread doesn't even cover the transaction fees.