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Since the early stages of Polkadot development, I've been intrigued by the promise of cross-chain smart contract communication. I've successfully built simple but a fully functioning decentralized exchange, but now I'm searching for interfaces or traits that would allow me to enable cross-chain calls. Unfortunately, I haven't been able to find the required information (in my imagination as it could work in practice).

To elaborate, I want to deploy my smart contract on Astar and Shiden parachains and facilitate cross-chain swaps. I believe I need specific interfaces to implement this functionality, but my search has been fruitless so far. With that in mind, my question is: How can I achieve cross-chain calls in ink!?

Please correct me if my thinking is flawed.

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There is no way at the moment to do ink! cross-chain contract. Astar & Parity are actively working on this. In the meantime this is Astar roadmap regarding ink! XCM:

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