Returns a list of the existing liquidity pools and its corresponding tokens at a given block height. If no block is specified, it returns the latest list available.
successful operation
Block number and hash at which the call was made.
Array containing existent liquidity pool's token id.
"[{\"reserves\":[{\"parents\":\"1\",\"interior\":{\"here\": null}},{\"parents\":\"0\",\"interior\":{\"x2\":[{\"palletInstance\": \"50\"},{\"generalIndex\":\"2\"}]}}],\"lpToken\":{\"lpToken\":\"1\"} },{\"lpToken\":{\"lpToken\":\"0\"}}]"