Search transactions by events.
transaction events such as 'message.action=send' which results in the following endpoint: 'GET /txs?message.action=send'. note that each module documents its own events. look for xx_events.md in the corresponding cosmos-sdk/docs/spec directory
transaction tags with sender: 'GET /txs?message.action=send&message.sender=cosmos16xyempempp92x9hyzz9wrgf94r6j9h5f06pxxv'
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transactions on blocks with height greater or equal this value
transactions on blocks with height less than or equal this value