This repository consists of two sections: Swaps and Staking. In swaps directory there is the complete code of swaps web page. In Staking section, there are smart contracts for lockup NFT collection and backend of staking web page.

Directory with all smart contracts. It includes:

• lockup_collection_1.fc and lockup_collection_2.fc - two versions of the main contract (second has onchain rewards).

• nft_item.fc - contract of NFT item from lockup NFT collection.

• imports - directory with some utility functions and constants.

Directory with some scripts that will help you interact with the smart contract.

• config.ts - file with information about your wallet and contract addresses. You should edit it.

• changeJettonAddress.ts - script that will be needed only once, saves the contract's jetton wallet address in smart contract storage.

• lockTokens.ts - script for locking your jettons. You can change the jettonAmount and lockupPeriod variables in this file.

• returnTokens.ts - script for transferring your NFT back to the collection address and getting unlocked jettons. You should change the NFT address here.

Directory with Django app that implements rest api.

This smart contract implements locking up TON jettons for a variable or fixed periods. It is based on the NFT collection template from ton.org with the addition of handling custom opcodes and sections in storage. You can lock only one jetton type per smart contract instance.

While the first version of the smart contract only implies blocking funds for the time specified when sending them, the second version supports accrual of interest on deposits. The interest rate depends on the period of blocking funds ( allowable periods and the corresponding rates are specified in the form of a dictionary during contract deployment).

We verify all our smart contracts using verifier.ton.org so users can be sure of their reliability.

To lock your tokens, you need:

• Deploy the contract (you can find out more info about state init parameters in smc code. For version with onchain rewards note that royalty params have the custom structure)

• Find the jetton wallet address of the contract. You can get this by sending any amount of jettons to the contract and looking up the address on https://testnet.tonscan.org/address/{SMART_CONTRACT_ADDRESS}#tokens

• Change the jetton_wallet_address by sending an internal message to the smart contract (you can use the changeJettonAddress script). This variable contains the address of the jetton wallet, in which locked jettons will be stored.

• If you are using the version with on-chain rewards, then replanish the reward pool with the amount you need (you can use the addRewards script).

• Send jettons to the contract with msgValue and fwdAmount greater than 0.1 TON (you can use the lockTokens script)

After this, the smart contract will check that you transferred the correct jetton and mint an NFT that proves you own the locked tokens. Transferring this NFT to somebody transfers ownership of the locked tokens. The lockup start & end times and amount of locked jettons are stored on-chain in the NFT-item contract storage.

To withdraw your tokens, you need:

• Wait for the lockup period to end

• Transfer the NFT back to the collection address with msgValue and fwdAmount greater than 0.15 TON (you can use the returnTokens script)

The NFT collection contract will check that you sent a valid NFT and that the lock period has ended. If everything checks out, the tokens will be returned to your wallet and the NFT will be burned. In the version with on-chain rewards, you will receive staking_factor / staking_base jettons in addition to locked ones.

• Ability to lock any tokens (tokens with different addresses should be locked in different contract instances).

• On-chain rewards with different interest rates in one smart contract instance at the same time.

• Storing NFT content on-chain, while duplicating it off-chain, so users can see it in Tonkeeper or Getgems but also be assured it cannot be modified.

• Returning the NFT back to user if it was sent to the smart contract before the lockup period ended.

• Burning NFTs after unstaking (entire NFT balance is transferred to owner during this operation).

• Notifications when each NFT is transferred: NFT contract sends 0.01 TON to collection address with special opcode, previous owner address and new owner address, which is extremely useful for tracking all transactions of NFTs from one collection.

• Low gas fees: approximately 0.125 TON for staking and 0.04 TON for unstaking in the latest version of the contract.

Our smart contracts allow locking any tokens, so we plan to make our site a place where anyone can create a staking pool with on-chain rewards. In return, we will charge royalties in the form of a percentage of the rewards allocated by the project for stakers, as well as a percentage of the TVL of the pool. When creating a smart contract, royalty parameters can be configured, so the percentage fee will depend on the total amount of funds that the project Will allocate for user rewards. All fees will be collected from the fees pool, which the project must replenish before launching the staking program. We will distribute 50% of our income among NFT Tongochi Zones holders.

We have already partnered with our first client - Lave Foundation, whose staking pool TVL currently exceeds $16,000 ( however, they use our previous version of the smart contract, with a fixed lockup period. It contains a minor bug that increases fees by 0.03 TON).

In the Tongochi game, items can be enhanced by increasing their level attribute from +0 up to +13. However, starting from +3, there is a chance the item will be destroyed during improvement (even NFT items).

Items level +5 and above, when destroyed, go into a database where players can retrieve them using a developer coupon. This database stores the last 100 broken +5 level items from all Tongochi players, on a first-in-first-out basis.

Developer coupons are earned by staking PET or LP PET-TON jettons on the Tongochi staking page or using the Tongochi swapper. Users receive developer points for these actions that can be exchanged for a coupon.

The website backend uses Django Rest Framework to sync blockchain data with our databases using Tonapi as a blockchain indexer. All data is available via the public API. Developer points for off-chain rewards are also awarded to users through the website backend (1 point for 1 usd value of staked PET and 1.25 point for 1 usd value of staked LP PET-TON every minute)

• Instant updates of all staker and pool data after any contract interactions, thanks to tonconsole streaming API.

• Calculating USD equivalents of jettons & Ston.fi LP tokens by calling get methods of liquidity pools contracts (we use TON-JETTON pool to get TON value of jetton/LP token, then TON-USDT pool to get estimated USD value of TON). Will add Dedust LP tokens soon.

Swaps is a vue.js app in which you can swap different tokens. It is based on the STON.fi javascript SDK. Users get developer points each time they use it.

• Improvement of the website's frontend.
• Signing partnerships with more jettons.
• Adding an interface for creating your own staking pool.
• Launching Telegram Web App for staking
• Adding ability to withdraw funds before the end of the lockup period for a fee.
• Adding different reward options, e.g. NFTs.

Website:

• Main page
• Staking
• Swaps (will be remastered)

Game:

• Telegram bot
• Web App

Telegram channels:

• English
• Russian

Contacts:

• @arkadiystena - for technical questions about this repository.
• @donlusofon - for any other questions.