@jonathanmarcus Thanks for the question! 0x protocol likely won't support cross-chain atomic swaps any time soon. My guess is that cross-chain swaps will be costly (transactions on 2 different blockchains) and will not have a great trading UX. Instead, side chains or pegs will be used to move blockchain assets onto chains that can serve as a low-friction settlement layer. This will allow for things like ERC20 tokenized BTC and therefore BTC/ETH trading pairs on the Ethereum blockchain.

We do plan to make 0x protocol blockchain agnostic: 0x orders adhere to the same message format regardless of blockchain but we can swap out different blockchain backends for settlement. The blockchain we are most interested in supporting next is EtherMint, an EVM blockchain with Tendermint consensus that will be part of the Cosmos network and that supports 10-100x more tps than Ethereum.

@willwarren89 Thanks for such a clear and informative response, as always!

Thank you for the question @avichal! There are many interesting possibilities and challenges around liquidity sharing. To my knowledge, it has never been possible for orders to seamlessly flow through a global network of interconnected exchanges, marketplaces and dApps. I think these interconnections will act as a source of network effects around liquidity. On the other hand we have some technical challenges to work through (1) allowing relayers to share transaction fees in a trustless way and (2) experimenting with trade execution systems that prevent trade collisions.

@willwarren89 I see how it is :)

@ljxie @ljxie :P

@_R_Block Privacy preserving crypto is the future. No one wants their personal bank account statements to be open to the public. It is still early for privacy in 0x protocol due to the tech stack we are building on but we are closely watching the developments that might make private trading possible. We will likely need access to new cryptographic primitives on Ethereum.

@_R_Block @willwarren89 KEEPs :)

@_R_Block @jonathanmarcus We are definitely interested in Keep. The technology looks promising and the team is great.

@_R_Block @willwarren89 Also Nucypher

@zosegal Proof of stake should speed up transaction times by cutting block times down to ~5 seconds from 15 seconds today. More than anything else, we need scaling to avoid network congestion and to keep transaction fees low.

Thank you for the question @mcohen! I am excited to see mobile dApps using 0x protocol because some of the world's largest emerging economies rely on mobile devices for access to the internet. I'm looking forward to the tokenization of scarce digital goods such as video game items and being able to trade them with anyone in the world, which is one of the reasons why we are working so hard to support non-fungible tokens in version 2 of 0x protocol.

Side note: check out ERC821 (https://github.com/ethereum/EIPs/issues/821)

@mcohen @willwarren89 "Scarce digital goods such as video game items and being able to trade them with anyone in the world" seems like such a massive and interesting opportunity. I'm very excited that 0x is focused on supporting non-fungible goods. Wax and Dmarket are focused in this area too, albeit with very different and more confusing/complex technical implementations.

Thanks for the question @Jon_Grinnell! First, I am not a lawyer and this is not legal advice. The concept of a non-custodial exchange is new and it doesn't seem like there is an existing legal framework that applies well here. The good news is that relayers building on 0x have a strong incentive to get good legal counsel and to make sure they are operating legally because they are putting in tremendous effort/resources to build a sustainable business, have VC backing, etc.

Global peer-to-peer exchange can benefit the world in a number of ways, including subverting "bad" governments/economic policies. I hope that with proper education regulators are able to see the benefits (maybe just the less controversial ones) and regulate responsibly. It will be interesting to see what happens in China.

This is an interesting subject that deserves a full blog post.

@lucasmpinelli +1

@Todd-Goldberg We are getting close with ERC821 https://github.com/ethereum/EIPs/issues/821

@Todd-Goldberg Another centralized exchange getting hacked would probably do the trick (I don't want this to happen). Regulators shutting down centralized crypto exchanges will also drive mass migration to decentralized exchanges (thanks China).

Other than these catastrophic failure modes, we need blockchain scalability solutions that provide orders of magnitude increases in transaction throughput. We need more education around private key management. We need adoption of hardware wallets.

Thanks for the questions @zosegal! Simple applications of token abstraction like making payments denominated in any token are technically possible today but are only economical for liquid tokens. We will probably see things like token abstraction for payments get traction once a greater selection of ERC20 tokens become liquid on 0x relayers.

Great question @akondagunta. In my view, the number of tokens on the Ethereum blockchain is going to trend towards infinite and that relayers will differentiate themselves by locking down niche markets. In a world where there are practically infinite tokens, traders will form into groups around the niche markets that they are interested in and the associated marketplace will be tailored to that user base. The group forming behavior could be similar to Reddit with subreddits, where traders subscribe to different markets based upon their particular interests but each subreddit is a different relayer.

I have more thoughts on this that I will write up in a blog post.