Understand stablecoins and DeFi basics — Hinglish notes

2.3.11 · Stock-Market › Commodities, Forex & Crypto

Overview

Stablecoins woh cryptocurrencies hain jo ek stable value maintain karne ke liye design ki gayi hain (usually $1 USD se pegged), jabki DeFi (Decentralized Finance) ek blockchain-based financial system hai jo intermediaries ke bina traditional banking services ko recreate karta hai. Ye speculation se aage ke "mature" crypto use-cases represent karte hain.

Stablecoins: Digital Dollars on Rails

Fiat-Collateralized Stablecoins Kaise Kaam Karte Hain

The Mechanics (USDC example):

Circle (the issuer) ek bank account mein $1 million USD hold karta hai
Wo Ethereum pe 1 million USDC tokens mint karta hai
Jab tum redeem karna chahte ho, tum 1 USDC burn karte ho → $1 USD milta hai wapas
Arbitrage price ko $1 pe rakhta hai: agar USDC $1.02 pe trade kare, toh arbitrageurs $1 mein USD khareed ke USDC mint karte hain, $1.02 mein bechte hain instant profit ke liye jab tak price normalize na ho

YE KYUN KAAM KARTA HAI: Issuer ki redemption guarantee ek hard floor/ceiling create karti hai. Market forces baaki kaam karte hain.

Crypto-Collateralized: DAI Example

DAI bina dollars hold kiye $1 peg kaise maintain karta hai:

Over-collateralization: $100 DAI mint karne ke liye $150 ETH lock karo (150% collateral ratio)
Liquidation mechanism: Agar ETH gire aur collateral ratio 130% se neeche aa jaye, toh tumhara vault liquidate ho jaata hai (DAI debt + penalty cover karne ke liye collateral bech diya jaata hai)
Stability fee: Borrowed DAI pe annual interest rate (jaise 2%), peg maintain karne ke liye supply burn karta hai

OVER-COLLATERALIZE KYUN KAREN? Crypto volatile hai. Buffer ensure karta hai ki flash crashes ke dauran bhi har DAI ko back karne ke liye hamesha kaafi value ho.

DeFi: Finance Ko Banks Ke Bina Rebuild Karna

Core DeFi Primitives

1. Decentralized Exchanges (DEXs)

Traditional exchange model:

Order book: Buyers bids post karte hain, sellers asks post karte hain, exchange unhe match karta hai
Problem: Centralized servers chahiye, hacks/manipulation ke liye vulnerable

Automated Market Maker (AMM) model:

2. Lending Protocols (Aave, Compound)

Ye kaise kaam karta hai:

Supply side: Tum 1,000 USDC deposit karte ho → 3% APY earn karte ho (interest borrowers se aata hai)
Borrow side: Tum $2,000 ETH collateral ke roop mein deposit karte ho → 1,000 USDC 5% APY pe borrow karte ho
Liquidation: Agar ETH gire aur tumhara collateral ratio threshold (maan lo 125%) se neeche aa jaye, toh liquidators tumhara collateral discount pe kharid lete hain tumhara debt repay karne ke liye

Worked example DeFi Leverage Loop

Goal: Recursive borrowing use karke apna ETH exposure amplify karo

Initial: Tumhare paas $10,000 ka ETH hai

Step 1: Aave pe 10,000 ETH collateral ke roop mein deposit karo

Ye step kyun? Tumhe borrow karne ke liye collateral chahiye

Step 2: 7,000 USDC borrow karo (70% LTV—loan-to-value)

Ye step kyun? Max safe borrow ~75% hai; tum liquidation se bachne ke liye buffer chhod rahe ho

Step 3: USDC se 3,500 aur ETH kharido (assume ETH = $2,000)

Ye step kyun? Tumhe zyada ETH exposure chahiye

Step 4: Wo 3,500 ETH deposit karo, 2,450 USDC borrow karo, 1,225 ETH kharido, repeat karo…

Ye step kyun? Har loop zyada leverage add karta hai

5 loops ke baad: Tum $10,000 initial capital se ~$25,000 ETH control karte ho (2.5x leverage)

Risk: Agar ETH 20% gire, tumhari collateral value tumhare debt se tezi se giregi → liquidation. Aise hi cascading liquidations hoti hain.

3. Yield Farming & Liquidity Mining

Mechanism:

AMM pool mein liquidity provide karo (jaise Uniswap mein 1 ETH + 2,000 USDC deposit karo)
Trading fees earn karo (pool se har swap ka 0.3%, LPs mein split)
Governance tokens earn karo (protocols LPs ko apne native token se reward karte hain, jaise UNI)

Formula Impermanent Loss

Jab tum 50/50 pool mein liquidity provide karte ho aur prices change ho, tum sirf hold karne ke mukable value lose karte ho: $IL = \frac{2 r}{1 + r} - 1$ jahan $r = \frac{P _{end}}{P _{start}} (price ratio)$

$Derivation :$

$Initial: deposit V_{0} worth of A and V_{0} worth of B (total 2 V_{0})$

$Pool maintains x \cdot y = k and equal values: x \cdot P = y (where P is price of A in B)$

$If price changes to P^{'} :$

$- New amounts: x^{'} = k / P^{'}, y^{'} = k \cdot P^{'}$

$- Value in pool: V_{pool} = 2 x^{'} P^{'} = 2 k \cdot P^{'}$

$- Value if held: V_{hold} = x_{0} P^{'} + y_{0}$

$After substitution and algebra (setting r = P^{'} / P):$ $IL = \frac{2 r}{1 + r} - 1$ Example: ETH $2,000 → $4,000 jaata hai (r = 2) $IL = \frac{2 2}{3} - 1 = - 5.7%$

Tumne ETH+USDC alag hold karne ke mukable 5.7% lose kiya. KYUN? Pool ne tumhari position rebalance ki (50/50 ratio maintain karne ke liye ETH badhte hi bechta gaya).

DeFi ke Liye Risk Framework

Key risks:

Smart contract bugs: Code exploits (jaise reentrancy attacks)
Oracle failures: Price feeds manipulate hone par → galat liquidations
Governance attacks: Whales treasury drain karne ke liye vote karte hain
Regulatory risk: Protocol illegal declare ho jaata hai, tokens worthless
Composability risk: Tumhara yield farm 5 protocols pe depend karta hai—ek fail ho toh cascade

Risk mitigation:

Audited protocols use karo (Trail of Bits, OpenZeppelin audits)
Protocols mein diversify karo (sab kuch ek farm mein mat daalo)
Liquidation thresholds samjho (150% collateral ratio pe alerts set karo)
Chhote se shuru karo—DeFi abhi bhi experimental hai (ise venture capital ki tarah treat karo, savings ki tarah nahi)

Visual Summary

Figure — Understand stablecoins and DeFi basics

Recall Feynman Technique: Ek 12-Saal ke Bacche Ko Explain Karo

Socho regular paisa, lekin internet pe, ek giant shared spreadsheet pe jo sab log dekh sakte hain (blockchain).

Stablecoins digital dollar bills jaisi hain—har coin hamesha $1 worth hoti hai. Kaise? Kuch companies (jaise Circle) promise karti hain: "Mujhe ye coin do, main tumhe real dollar dunga." Doosre stablecoins aur zyada valuable crypto lock kar dete hain (jaise $100 borrow karne ke liye $150 sone ko lock karo) taaki unhe back karne ke liye hamesha kaafi value ho.

DeFi banker khelne jaisa hai, lekin koi actual bank nahi hai. Tum apne digital dollars strangers ko lend kar sakte ho (computer sambhal leta hai), aur wo tumhe interest dete hain. Ya tum "liquidity provider" ban sakte ho—socho tumne ek vending machine mein seb aur santre daale, aur har baar koi seb ke liye santre trade kare, tumhe ek chhoti si fee milti hai. Vending machine automatically code se chalta hai (smart contracts), koi insaan nahi chahiye.

Catch kya hai? Agar code mein bug ho, toh koi sab kuch chura sakta hai. Agar prices crash ho jaayein, toh tum paisa lose kar sakte ho chahe tumne "sab sahi kiya." Ye grown-up finance khelne jaisa hai lekin training wheels ke saath jo phir bhi gir sakti hain.

Connections

Cryptocurrency-basics - Prerequisites: blockchain, wallets, gas fees
Smart-contracts-and-Ethereum - DeFi ke liye technical foundation
Decentralized-exchanges - AMM math aur DEX types mein deep dive
Yield-farming-strategies - Advanced farming techniques aur risk management
Traditional-bankingvs-DeFi - Centralized vs. decentralized finance ka comparative analysis
Crypto-security-best-practices - DeFi mein apne funds protect karna
Liquidity-pools - Liquidity provide karne ki mechanics

#flashcards/stock-market

Stablecoins ke teen main types kya hain? :: 1) Fiat-collateralized (banks mein USD se backed, jaise USDC), 2) Crypto-collateralized (crypto se over-collateralized, jaise DAI), 3) Algorithmic (supply/demand algorithms, high-risk)

Arbitrage ek stablecoin ka $1 peg kaise maintain karta hai?

Agar price > $1: arbitrageurs USD khareedte hain, stablecoin mint karte hain, bechte hain → supply badhti hai → price girta hai. Agar price < $1: stablecoin sasta khareedte hain, $1 ke liye redeem karte hain → supply ghatti hai → price badhta hai. Equilibrium $1 ± transaction costs pe.

Uniswap constant product formula kya hai?

x · y = k, jahan x aur y pool mein token amounts hain, k constant hai. Token A ki price = y/x. Swaps x aur y change karte hain lekin k maintain karte hain, bade trades pe slippage hoti hai.

Crypto-collateralized stablecoins ko over-collateralization kyun chahiye?

Crypto volatile hai. Ek buffer (jaise 150% collateral ratio) ensure karta hai ki price crashes ke dauran bhi har stablecoin ko back karne ke liye hamesha kaafi value ho. Threshold se neeche (jaise 130%), liquidation hoti hai.

AMM mein impermanent loss kya hai?

Assets alag hold karne ke mukable loss jab tum pool mein liquidity provide karte ho aur prices change ho. Formula: IL = 2√r/(1+r) - 1, jahan r = price ratio. Example: agar ETH double ho, tum sirf hold karne ke mukable 5.7% lose karte ho. Pools tumhari position rebalance karte hain jab prices move karen.

DeFi aur uski key properties define karo :: Decentralized Finance—public blockchains pe smart contracts use karke banaye gaye financial services (lending, trading, insurance). Properties: permissionless (no KYC), transparent (on-chain), composable (protocols stack hote hain), non-custodial (tum keys control karte ho).

DeFi lending protocols supply APY kaise calculate karte hain?

Supply APY = Utilization Rate × Borrow APY × (1 - Reserve Factor). Jahan Utilization = Total Borrowed / Total Supplied. High utilization → zyada supply incentivize karne ke liye higher rates. Reserve factor protocol maintenance fund karta hai.

DeFi lending mein liquidation kya hai?

Jab tumhari collateral value girne par collateral ratio threshold se neeche aa jaaye (jaise Aave mein 125%), toh liquidators tumhara collateral discount pe kharid lete hain tumhara debt + penalty repay karne ke liye. Lenders ko undercollateralized loans se protect karta hai.

DeFi yields "free money" nahi hain, iske kya risks hain?

1) Price divergence se impermanent loss, 2) Smart contract bugs aur hacks, 3) Rug pulls (team tokens dump kar deti hai), 4) High gas fees, 5) Composability risk (cascading failures). Real APY = Nominal - Losses - Costs - Risk.

Stablecoin depeg event kya trigger karta hai?

Backing mein confidence ka loss (jaise issuer insolvency), oracle failures, liquidity crises (mass redemptions), ya algorithmic mechanism failures (death spirals jaise UST/LUNA). Arbitrage fix nahi kar sakta agar fundamental backing broken ho.