Image header : Project title : Papaya anchor (apay.io) Summary : Anchor for BTC, USDT, LTC, ETH, KIN and other cryptocurrencies and tokens Category : Applications Goals : General goals for apay: Make most popular crypto tradable on SDEX Improve SDEX liquidity Specific goals for the latest updates: Make all our code open-source, so everyone can use it for their projects Turn apay.io from static website with instructions into a functional exchange, rival to changelly, shapeshift and others Improve liquidity by attracting user funds and making opportunities for users to make money by providing liquidity Timeline : 15 Feb - MVP of new anchor backend, functional for Testnet BTC (complete) 01 Mar - MVP of new frontend (complete) 15 Mar - Anchor backend fully functional for assets already supported by apay, like ETH, ERC20 tokens + KIN (partially complete) 01 Apr - New market-making service, inspired by uniswap, rewarding users for participation (complete) 15 Apr - Interactive flow (sep24) implemented for anchor backend (in progress) 01 May - Launch new frontend May-June - Migrate to the new backend Description : Apay is one of the oldest crypto-anchors on Stellar network. I'm using that experience of running the platform for almost 3 years to build a new more-reliable and secure open-source version. Anyone can now start their own anchor by using our code. We're also launching a new frontend for currency conversion on stellar DEX, interface is similar to changelly and similar services. You can now access liquidity on Stellar without making a Stellar account or establishing trustlines. The latest batch of changes is a full rebuild of our platform: Third major improvement - Market-maker service - for people who aren't technical enough to run something like kelp bot. Users will be able to commit capital and bot will do the trading following a simple, but effective algorithm. Users can withdraw their funds back at any time, and make some return on their investment. Provided capital is going to help liquidity on Stellar, while user funds are stored safely in a cold-storage. Links : https://apay.io https://github.com/apay-io/stellar-anchor - new open-source anchor backend https://github.com/apay-io/apay-io - new frontend with exchange feature https://github.com/apay-io/apay-bot - market-maker bot Tags : anchors, node.js

Just a small update: frontend prototype is published here https://apay-io.apay.workers.dev/ Check it out and let me know if you like it or not. It is of course still in development (buggy), and don't send real funds, there is no tx processing

The UI looks nice. Is this going to be a custodial solution? How do you secure the private keys if so?

inative Is this going to be a custodial solution? How do you secure the private keys if so? There are 3 parts to this question: Anchor itself is a custody solution, you deposit BTC, we store it securely (90% in cold storage without rehypothecation, exchanges or any other third parties), then we give it back whenever you request it by sending BTC token back on Stellar. "My account" section requires only a public key at the moment, it's just an overview of the account and simpler way to explain to people how to deposit/withdraw assets to/from the anchor. (still complicated, because users need to sign transaction manually, so I'm considering options with private key, but existing solutions are not production-ready) Currency swap is not atomic, so yes, it takes custody of your funds for the moment of the exchange. You can actually do a path payment yourself, if you understand it, but this interface is targeted at people who may not have/want stellar account.

Big fan of this expansion to the apay service. Looks like a legitimate effort in making a polished exchange UI. Very similar to coinbase design language.

Is this not against the spirit of stellar ? When you do Marketing , the user must trust you to use this , and this make it not decentralized. By putting this in front , you want to put other stellar anchor and asset in the shadow. The Goal of stellar DEX is to be one Network for every asset , stellar native asset and crypto . You want to kill the DEX volume with this.

Justin I don't understand why. I've tried different methods to explain to users what DEX is, some just don't care. My goal is to provide easy-to-use service. Everyone can use it without the complexity of setting up an account, funding it, establishing a trustline, making offers or path payments. All exchanges are happening on Stellar, which is good for everyone and brings more liquidity to the DEX. Users will be incentivized to learn about Stellar, because when you withdraw BTC - you pay a $1 fee. Withdrawing to Stellar account is free. Additionally I'm open-sourcing it all, everyone can spin up another service like that, maybe hundreds of them in every possible language. When it brings more users - it's more profitable for market-makers, which is even better for liquidity and end-users.

[unknown] I think it was better to complete your web app and then participated in the SDF grant, It's like a soulless creature. But I hope you complete later, I think you're a strong supporter

John At this point I'd appreciate if you could provide more details, what do you think sucks in the current version? I'm at the point of making it live, just needs a bit more testing for the transaction processing. I agree it's far from perfect in UI/UX perspective, but that's what I have resources for at the moment. The bigger issue is liquidity, and this is what I'm focused on right now with hosted trading bot, which allows external contributions from users.

Papaya anchor (apay.io)

dexter

umbrel

This was a good read. I have an alternative perspective on one point- arbitrage traders generally remove liquidity so I wouldn't call them liquidity "providers". They typically act at the last minute and only consume the offers that are profitable to them. This is especially true for Stellar path arbitrage. They trade and contribute to the volume, but they don't add anything to the order book.

umbrel

dexter Yes, they are takers, but it's important too, because it helps others to complete the trade. MM won't be profitable if nobody takes their offers. Markets are healthier when there are many different roles/participants.

dexter

umbrel Arbitragers are also looking to profit. They will come naturally when there are opportunities and the more liquidity makers there is the more opportunity there will be. So I think it all comes down to the market makers and individual traders. And you already mentioned in the article. Really the root cause with Stellar DEX's lack of liquidity is the lack of makers. For some of the more well-known anchors like AnchorUSD, Tempo and Cowrie, they seem to come and go.

I really like your initiative to crowdsource market making. Stellar really need more initiatives to fill up the orderbooks. It seems like the economics behind your proposal is a different than Uniswaps. To my understanding- the primary source of return for Uniswap is trading fees- to use their liquidity for trading you have to pay their fee, which get distributed out to the pool holders. It's a close-ended system in that regards. So unless you're looking to lock down how people could trade your assets (what Stronghold did before), profiting from trading fees is not really viable on Stellar. So I'm assuming the primary source of returns for your pool participants is distributing profit from the market making strategy?

umbrel

dexter Yes, it is similar because my market maker puts spread, so if you want to use its liquidity you kinda pay the fee to participants. However environment is more competitive than with uniswap, because we compete against other market-makers on Stellar DEX.
BTW there are arbitrage strategies which also add liquidity to the market, bot can place offers on Stellar mimicking the orderbook of another exchange and whenever it gets a match on Stellar - it will execute counter-trade on another exchange.

umbrel

All MM bots are now live for pairs:

USDT/XLM
USDT/BTC
USDT/ETH
USDT/LTC
USDT/BAT
USDT/KIN
USDT/LINK
USDT/OMG
USDT/REP
USDT/ZRX

It's technically possible to commit funds already, but it requires sending special transactions and POST request to the endpoint.
I'm currently making it easier, by integrating into the interface, and once done going to publish detailed steps how it works.

umbrel

New frontend is in public beta and available for testing at https://beta.apay.io
Feel free to try currency conversion, log in with your stellar address, look around and let me know if there are any issues.

John

umbrel
"Send your funds" section" can be realtime, and then you can delete I paid button

OrbitLens

umbrel New interface looks awesome 👍️

Tchang7

Hello,

I tried https://beta.apay.io from an iPad Pro 2nd generation. I noticed the following:

Under "Convert", by sorting in the list of currencies according to each column title, some columns are not sorted in the correct order (name, price USD, liquidity depth);
Under “Convert”, also, when I scroll through the list of data by scrolling down the page, the row indicating the titles of the columns remains visible at the top, which is good, however it is not placed entirely at the top of the page but at 2 inches from the top of the screen. This means that two rows of data are visible above the title row as I scroll through the list;
Under "My account", the icons of some currencies remain grayed out (probably because they are not yet supported). The ones that appear are (in this order): XLM, LTC, BTC, ETH, BAT, USDT, REP, KIN, LINK, OMG, ZRX.

I have not tried deposit and withdrawal.

umbrel

Tchang7 Thank you, issues 1 and 2 have been fixed.
Icons are like that for now for simplicity, need to make sure all functionality works well first, then many things can be done to make it prettier.

John I agree, and I've spent almost a week in the beginning making it real-time, however there are number of issues with watching multiple chains on the backend and pushing it to the frontend through websocket or something, so decided to proceed with easiest possible implementation instead.

MisterTicot

Here are a few more tips.

For asset conversion, you could provide an alternative flow using a Cosmic.link such as:

https://cosmic.link/?type=payment&memo=id:50&network=public&amount=30&destination=GBGVRE5DH6HGNYNLWQITKRQYGR4PWQEH6MOE5ELPY3I4XJPTZ7CVT4YW

In such case, you don't need to ask for source pubkey as Cosmic.link takes care of it (assuming memoId is a unique identifier).

On the user experience side, I wrote a pen that shows how you can embed the signing interface: https://codepen.io/cosmic-plus/pen/xxwKNXv?editors=1010#0

If you prefer to avoid foreign code, you can achieve something similar by using a side-frame pointing to the Cosmic.link URL.

Finally, you can use "https:/cosmic.link/widget" to customize the signing interface. There's an example here:

https://codepen.io/cosmic-plus/pen/dyyrbwG

(You can edit the style in place)

dexter

umbrel The new interface looks great. I have one suggestion- it's very opaque how Stellar address maps to address of other cryptos and that could make some users feel uneasy, especially since it's a many-to-one mapping. It's not clear when you generate a new address if the old address is still valid. For transparency I think it'd be good to post the mapped address on to Stellar blockchain itself (e.g. send tiny payment to the Stellar address with the mapped address as memo) so there's a public record of this somewhere. To prevent abuse, you could do this in response to a "request" Stellar payment from that account.

umbrel

dexter there are 2 issues with that:

privacy
not all addresses can fit in stellar's memo field

I plan to show some more information for each account when I figure out a secure way to log people in without asking them for secret keys

BancorNetwork

Hey! Yesterday, we received a mail stating that our Bancor.network design was copied by you without permission, and we verified this when we examined the visual material and link you put here. We request that you delete the materials you copied immediately from Github and your website.

Bancor Network - https://www.bancor.network/

dzham

BancorNetwork

Maybe this could have been better done over email?

Also,

What's so proprietary about it?

The list of assets? All exchanges have that
The "Pay with" + "Receive" part? That's everywhere too.

You're just being dicks.

marcinx

Hey BancorNetwork ! Coinbase called. They said your website looks a whole lot like theirs and request you to take it offline immediately. Just kidding. It really does though.

All joking aside, I really like Papaya. It's by far the easiest way for newcomers to ramp on and off the Stellar Network. I don't think the network would be anywhere near where it is today if Papaya hadn't been around for the last few years. Keep up the good work.

BancorNetwork

Bancor Network - https://www.bancor.network/

@umbrel @tyvdh

umbrel

BancorNetwork oh lol, I didn't know.
But now, explain to me please what do you want me to delete?

Do we use any of your code? no
Do we pretend to be bancor? no

I agree that it looks too close to be a coincidence, but how many ways are there to put a table with 5 columns?
The person who did that has already left the company, I'm going to spend some time to make it look less like Bancor, but what exactly do you expect to be deleted?

dexter

umbrel I think having an account dashboard makes a lot of sense. For login we had to solve a similar problem with NiceTrade and we ended up implementing SEP-10 authentication through Cosmic Link as one of the options.

umbrel

Published another article explaining how to put funds into Market-maker bot
https://medium.com/apay-io/apay-mm-bot-for-stellar-dex-is-ready-65b6d6a38d13

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