Any way to reduce provider calls for subscriptions?

[rhlsthrm]

We are using JsonRpcProviders and would like to reduce provider calls. We have subscriptions listening to contracts, and leaving the UI on means thousands of requests in a few minutes. Can we control the polling loop rate or anything?

[zemse]

Heya Rahul!

You can definitely update the polling interval:

provider.pollingInterval = 10000 // default 4000

If you're having a lot of polling, you might leverage using the JSON RPC API directly. There is a eth_getfilterchanges which has the following benefits:

• You can combine filters into the single filter in some cases, which might help you reduce calls (e.g. listening to ERC20 transfers from various contract addresses)
• You get reorg handeling

The downsides is that you have is you have to use the lower level API:

const filterId = await provider.send('eth_newFilter', [{topics: ['..'], address: ['0x123', '0x456'], fromBlock: '', toBlock: 'latest'}]);

const logs = await provider.send('eth_getfilterchanges', [filterId]);