# What is NEBRA UPA?

## Submit a proof at [demo-app.nebra.one](http://demo-app.nebra.one)!

{% embed url="<https://www.youtube.com/watch?v=468eT6PRxO4>" %}

NEBRA's Universal Proof Aggregator (UPA) is our answer to the growing cost of on-chain ZK proof verification.

| Proof System | Gas Cost  | <p>FIAT Cost </p><p>(30 Gwei, 3000 USD ETH)</p> |
| ------------ | --------- | ----------------------------------------------- |
| Groth16      | 250,000   | 22.5 USD                                        |
| Halo2-KZG    | 400,000   | 36 USD                                          |
| STARK        | 1,500,000 | 105 USD                                         |

UPA *aggregates* proofs into batches, passing on the savings to you. The current release of UPA targets the popular proof system Groth16. Aggregating your proofs with UPA can save you up to 90% in verification costs!<br>

<figure><img src="https://1015642043-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsgCm7MS9j55dAcAEc56c%2Fuploads%2FfwBgajBK1Dno4TSAYQG4%2Fimage.png?alt=media&#x26;token=2bc717bf-f7e6-4d8d-a036-5b1947223833" alt=""><figcaption></figcaption></figure>

## Throughput

We have used UPA to aggregate 1 million proofs in 36 hours. Check out the [contract here. ](https://sepolia.etherscan.io/address/0x98D2c8A4FDDC1bdCbC8A059081Bf1918316CAB6B)


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