📘 Stablecoin Smart Contract – Solana

A decentralized stablecoin system on Solana using SPL tokens and SOL as collateral. Powered by Anchor and Pyth price feeds.

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🔧 Instructions

1. initialize_config()

Initializes the config and mint accounts (PDA).

• Signer: Authority

• Accounts:

  • config_account [PDA, "config"]
  • mint_account [PDA, "mint"]

• Programs: token_program, system_program

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2. deposit_collateral_and_mint_tokens(amount_collateral, amount_to_mint)

Deposit SOL and mint stablecoins.

• Signer: Depositor

• Accounts:

  • collateral_account [PDA, "collateral", depositor]
  • sol_account [PDA, "sol", depositor]
  • token_account [ATA for stablecoin]
  • config_account, mint_account, price_update

• Programs: token_program, associated_token_program, system_program

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3. redeem_collateral_and_burn_tokens(amount_collateral, amount_to_burn)

Burn stablecoins and redeem SOL.

• Signer: Depositor
• Accounts: Same as deposit
• Programs: token_program, system_program

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4. liquidate(amount_to_burn)

Liquidate undercollateralized positions. Burn tokens to receive SOL + bonus.

• Signer: Liquidator

• Accounts:

  • collateral_account, sol_account (target user)
  • token_account (liquidator)
  • config_account, mint_account, price_update

• Programs: token_program, associated_token_program, system_program

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5. update_config(min_health_factor)

Update system parameters (admin only).

• Signer: Authority
• Accounts: config_account

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🗃️ On-Chain Accounts

Config (PDA: "config")

• authority, mint_account
• liquidation_threshold, liquidation_bonus
• min_health_factor, bumps

Collateral (PDA: "collateral", depositor)

• depositor, sol_account, token_account
• lamports_balance, amount_minted
• is_initialized, bumps

PriceUpdateV2 (Pyth)

Used for SOL/USD price via FEED_ID: 7UVimffxr9ow1uXYxsr4LHAcV58mLzhmwaeKvJ1pjLiE

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⚠️ Custom Errors

• 6000 Invalid Price
• 6001 Below Min Health Factor
• 6002 Cannot Liquidate Healthy Account

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