
# Event Indexers

If you come from Solidity, you’ll know that Solidity allows you to create indexed parameters in your contract events. The indexed parameters allow you to search for these events using the parameters as filters.

While StarkNet does not currently allow you to create indexed parameters by default in Cairo you can index your events using some available indexers such as **[Apibara](https://www.apibara.com/)** and **[StarkNet Indexer](https://github.com/olegabu/starknet-archive-docs#starknet-indexer)**.


## StarkNet Indexer

**StarkNet indexer** is a service created to listen to blockchain events and decode and persist the emitted data, making it available for analysis with SQL, GraphQL, and HTTP queries.

They’ve also created a **[GraphQL console](https://summary.dev/console/)** that enables developers to query blockchain data for events, transactions and their inputs, as well as to filter, aggregate, and sum up values easily.


## Apibara


**Apibara** is a framework and protocol that helps you build real-time, composable streams of Web3 and Web2 data. Apibara solves the challenge of streaming blockchain data: blocks are not immutable, and their data can be invalidated in response to a chain reorganization.

There’s an amazing template to help you get started indexing events [**here**](https://github.com/apibara/python-indexer-template) and a tutorial guide [**here**](https://www.apibara.com/docs/tutorials/indexing-starknet-nft-events).

Swagtimus.eth

What are Event Indexers in Cairo lang? What is a StarkNet indexer?
Can you explain more about how it work and is there any difference between StarkNet indexer and Solidity once?

Newton

What are Event Indexers in Cairo lang? What is a StarkNet indexer?

What are the efficiency gains of using the direct Cairo graphics library versus transpiling graphics code with the Warp transpiler for 2D graphics rendering, and which approach may be more efficient in terms of performance and development time?

What are some advantages and disadvantages of using Cairo for 2D graphics rendering?
How does Cairo compare to other popular graphics libraries, such as SDL or OpenGL, in terms of performance and ease of use?
What is Warp, and how does it work as a transpiler for graphics code?
What are the potential benefits and drawbacks of using Warp to transpile graphics code to Cairo instead of using Cairo directly?
Are there any specific use cases or scenarios where one approach may be more effective than the other?
What are the best practices for optimizing 2D graphics rendering performance with Cairo, both with and without the use of Warp?

Comparing the efficiency gains of direct Cairo vs. transpiling with Warp for 2D graphics rendering

Hello, I am facing an issue with `starknet-devnet (v0.3.1)` . I do not manage to run RPC `starknet_addInvokeTransaction` with positional parameters; yet it works with pathfinder and other vers like `starknet_estimateFee`. It returns `int() can't convert non-string with explicit base`. It is working fine on GOERLI. I have document the case on the repo https://github.com/Shard-Labs/starknet-devnet/issues/282. Does anyone have an example of a positional request to `starknet_addInvokeTransaction` on devnet that is working? The test inside the testsuite is also using named parameters. Thank you for your help

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Does anyone have an example of a positional request to `starknet_addInvokeTransaction` on devnet that is working?

Hey, is there a unsigned_div_rem supporting dividing by 2**128 ?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Is there a unsigned_div_rem supporting dividing by 2**128 ?

Hey,
As each storage value is by default initialized to 0, does writing it to zero actually do something? Does it use storage in layer 1 with value 0? Or does it just do nothing?
Should I check that the value I want to write is different than 0 before writing it otherwise I will waste storage?

The same idea: does writing a storage value to 0 free storage on l1

Does writing it to zero actually do something?

How do I create account using starknetjs?

# Hello world!
Why does it take more time to make swap on starknet than other L2 blockchain?

Why does it take more time to make swap on starknet than other L2 blockchain?

Is there any blockchain project contract supporting web2 scripts executable on VIa EVM?

I think it only one Tru (truebit)

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What are Event Indexers in Cairo lang? What is a StarkNet indexer?

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Event Indexers

StarkNet Indexer

Apibara

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