Introduction to Webhooks

If you want to be aware of all asset transfers, even outside our API, you can utilize Webhooks.

Testing locally

We highly recommend to test your Webhook locally first. To do that, you can use a tool like https://ngrok.com (opens in a new tab) to quickly expose your application to the outside world. After running ngrok simply take the url it generates for you, it should have a following format: https://2be4-(...)-75.ngrok-free.app and use it as your Webhook's url.

Registering Webhooks

To learn how to listen to specific events, visit one of the pages:

• Token Transfers: Listen to token transfers

Delivery

Each request will be a POST with an array of events like this:

[
   {
      "type":"TokenTransfers",
      "contractFunction":"TransferSingle",
      "contractAddress":"0xd71(...)272e",
      "from":{
         "address":"0x607(...)468",
         "externalEntityId":"SomeEntityId" // 👈 only added if this address is owned by one of your players
      },
      "to":{
         "address":"0x9b5(...)7D2",
         "externalEntityId":"SomeOtherEntityId" // 👈 only added if this address is owned by one of your players
      },
      "transfers":[
         {
            "tokenId":"123",
            "amount":"2"
         }
      ],
      "blockNumber":"967046",
      "transactionHash":"0xa707(...)b04"
   },
  (...)
]

Our implementation expects any 2xx code in response and will retry if that's not the case. We will try to deliver each request three times in 10, 20 then 30 second intervals.

Verifying signatures

When you create a Webhook, in the response you will receive a parameter called signature. It's important to store it somewhere, so you can later find out whether data came from Beam, as each event sent will contain a X-Webhook-Signature header, that will contain the signature. All sent events will also contain a transactionHash so you can find and verify them on the chain if needed.

Others

You can list all your registered Webhooks and remove any of them via the API or SDK:

// list
const webhooks = await beam.webhooks.getWebhooksForGame();
 
// delete
await beam.webhooks.deleteWebhook(webhookId);