wout / venster-examples

A repo with example implementations of the DAT Metadata Standard.

Venster Examples

This repo contains example implementations of the DAT Metadata Standard. They are all minted on the mainnet and preprod networks under policy ID 3333acb55ed79731ea6658abb74f453cbb87e15aee01a7aab484b2a6.

Block data JSON endpoint

Browser-based DATs have an endpoint available to query data from the latest block at runtime. This is done using the postMessage API. Here's an example:

// Request the data from venster periodically (every 10 seconds)
setInterval(() => window.parent.postMessage('@current_block', '*'), 10000)

// Receive the data from venster
window.addEventListener('message', (event) => {
  // Handle the requested data
  console.log(event.data.current_block)
})

For now, there's only the @current_block endpoint, but more endpoints will be available in the future.

Note: since Cardano produces a block every 20 seconds, there's no need to use a higher frequency than 10 seconds. If too many requests are sent to the endpoint, your token may be rate limited or even blocked.