Switch to Circle EUR.s deployment of Forex AMM for current Vortex version

[prayagd]

Context

Currently vortex uses MYKOBO EUR.s in the backend which is to be demised, this ticket is to switch it to Circle EUR.s

Requirement

• [x] Replace MYKOBO EUR.s with Circle EUR.s in the Vortex backend
• [x] Set the anchor endpoint for Circle EURC using the toml file
• [x] Ideally check the issuer of the Stellar EURC used by the Nabla deployment to determine the anchor endpoint

[prayagd]

Hey team! Please add your planning poker estimate with Zenhub @ebma @gianfra-t @TorstenStueber @bogdanS98

[ebma]

If I understand correctly, we'd need to modify the existing Nabla deployment or deploy a new one. Modifying the existing one is probably better so we don't have to deposit all the liquidity again. However, I think we should withdraw all the deposited Mykobo EURC from the existing pool before removing it from the Nabla deployment. Or what do you think about how we should approach this @TorstenStueber?

[TorstenStueber]

There is already a Nabla deployment for USDC.axl and EURC Circle:

• description on Notion
• non-merge PR for the Portal connecting to it
• the respective portal instance

What is confusing is that we refer to the two Nabla instances on Pendulum as the "USDT" and the "USDC.axl" one. In fact,

• the "USDT" instance uses EURC Mykobo and we added a USDC.axl pool to it later
• the "USDC.axl" instance uses EURC Circle

So we just need to use the "USDC.axl" instance. You will see that currently all pools are empty and we need to fill them. Then we are good to go.

[prayagd]

@TorstenStueber can you please add your estimates?

[TorstenStueber]

Additionally we need to charge all pools of the Nabla deployment: https://www.notion.so/satoshipay/24-05-16-Nabla-Pendulum-Deployment-c7cefd58f44c428a92ceaea30c603286?pvs=4#8e4f600924684cc1a9f2e1842323dda6

[gianfra-t]

Mykobo does not yet support EURC circle, right? I am looking at their well-known/stellar.toml and it still points to the previous EURC.

So besides charging the pools, we need to wait for them to support this? Or is this file incorrect?

[ebma]

Good question, I never tried. But looking at the blog post, I assume that this feature is already live for some time now. @pendulum-chain/product can you confirm that withdrawing circle EURC with Mykobo is possible? Have you tried that before?

[gianfra-t]

Because so far we only specify the asset code, then there is no way to differentiate between both. Since the offramp account has been the Mykobo EURC one, leads me to think that this is not supported, or at least some extra parameter has to be passed.

For instance, the optional asset_issuer allowed in the sep 24 specs.

[ebma]

Interesting, thanks for sharing. Maybe they support both assets and we can just send either Mykobo EURC or Circle EURC to their endpoint and the result is the same. Could be that they just forgot to update their Stellar.toml file.

Let's wait for a clarification from the product team and if no one tried this before we can reach out on Slack.

[gianfra-t]

Moving to Icebox until we have clarification from Mykobo, or decide to test it anyway.

[vadaynujra]

MYKOBO has explicitly confirmed that they can off ramp Circle's EURC already. I will confirm why their .toml file doesn't already include it @gianfra-t @ebma

[vadaynujra]

For this ticket's pov, we can go ahead and test, taking my confirmation as final for now.

[gianfra-t]

@pendulum-chain/product we can test a EURC.circle based off-ramp in this deployment.