Research

What Is an API? Practical Guide for Developers

Understand what an API is, how APIs power crypto and AI systems, and practical steps to evaluate and integrate APIs for reliable, secure, and scalable applications.
Token Metrics Team
6
MIN

APIs (application programming interfaces) are the connective tissue of modern software. Whether you use mobile apps, web services, or AI agents, APIs let systems exchange data and trigger actions without sharing inner code. This guide explains what an API is, how APIs work, why they matter in crypto and AI, and practical steps to evaluate and integrate them.

What is an API? — definition and types

An API is a set of rules and definitions that allow one software program to interact with another. At its core, an API defines endpoints (URLs or RPC methods), expected inputs, responses, and error formats. APIs abstract complexity: a developer can request a price, submit a transaction, or call a machine-learning model without needing the provider’s internal implementation details.

Common API types include:

  • REST APIs — Use HTTP verbs (GET, POST, PUT, DELETE) and JSON payloads. Widely used for web services and easy to integrate.
  • GraphQL — Lets clients request exactly the fields they need in a single query, reducing over- and under-fetching.
  • WebSockets — Support bi-directional, low-latency streams for live updates (e.g., market feeds, chat).
  • gRPC / RPC — High-performance binary protocols suitable for microservices or low-latency needs.

How APIs work: protocols, endpoints, and security

APIs expose functionality through well-documented endpoints. Each endpoint accepts parameters and returns structured responses, typically JSON or protocol buffers. Key concepts include authentication, rate limiting, and versioning:

  • Authentication — API keys, OAuth tokens, or JWTs verify identity and access rights.
  • Rate limiting — Protects providers from abuse and ensures fair usage by capping requests per time window.
  • Versioning — Maintains backward compatibility as APIs evolve; semantic versioning or URL-based versions are common.

Security best practices involve TLS/HTTPS, least-privilege API keys, signing of critical requests, input validation to avoid injection attacks, and monitoring logs for unusual patterns. For sensitive operations (transactions, private data), prefer APIs that support granular permissions and replay protection.

APIs in crypto and AI: practical use cases

APIs power many crypto and AI workflows. In crypto, APIs provide price feeds, historical market data, exchange order placement, blockchain node interactions, and on-chain analytics. For AI, APIs expose model inference, embeddings, and data pipelines that let applications integrate intelligent features without hosting models locally.

Use-case examples:

  • Market data — REST or WebSocket streams deliver price ticks, order books, and trade history to analytics platforms.
  • On-chain access — Node APIs or indexing services offer transaction history, wallet balances, and smart-contract state.
  • AI inference — Model APIs return predictions, classifications, or embeddings for downstream workflows.
  • Automated agents — Combining market and on-chain APIs with model outputs enables monitoring agents and automated processes (with appropriate safeguards).

AI-driven research platforms and analytics providers can speed hypothesis testing by combining disparate APIs into unified datasets. For example, Token Metrics and similar services merge price, on-chain, and sentiment signals into actionable datasets for research workflows.

How to evaluate and integrate an API: checklist and best practices

Selecting and integrating an API involves technical and operational checks. Use this checklist to assess suitability:

  1. Documentation quality — Clear examples, response schemas, error codes, and SDKs reduce integration risk.
  2. Latency and throughput — Measure median and tail latency, and confirm rate limits align with your use case.
  3. Reliability SLAs — Uptime guarantees, status pages, and incident history indicate operational maturity.
  4. Data accuracy and provenance — Understand how data is sourced, normalized, and refreshed; for crypto, on-chain vs aggregated off-chain differences matter.
  5. Security and permissions — Check auth mechanisms, key rotation policies, and encryption standards.
  6. Cost model — Consider per-request fees, bandwidth, and tiering; estimate costs for production scale.
  7. SDKs and community — Official SDKs, sample apps, and active developer communities speed troubleshooting.

Integration tips:

  • Prototype quickly with sandbox keys to validate data formats and rate limits.
  • Build a retry/backoff strategy for transient errors and monitor failed requests.
  • Cache non-sensitive responses where appropriate to reduce cost and latency.
  • Isolate third-party calls behind adapters in your codebase to simplify future provider swaps.

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Common implementation patterns

Several integration patterns appear repeatedly in production systems:

  • Aggregator pattern — Combine multiple providers to improve coverage and redundancy for market data or on-chain queries.
  • Event-driven — Use WebSockets or message queues to process streams and trigger downstream workflows asynchronously.
  • Batch processing — Fetch historical snapshots via bulk endpoints for backtesting and model training.

Choosing a pattern depends on timeliness, cost, and complexity. For exploratory work, start with REST endpoints and move to streaming once latency demands increase.

FAQ: What is an API?

Q: What’s the difference between an API and a web service?

A web service is a specific type of API that uses network protocols (often HTTP) to provide interoperable machine-to-machine interaction. All web services are APIs, but not all APIs are web services (some are in-process libraries or platform-specific interfaces).

Q: What is an endpoint in an API?

An endpoint is a specific URL or method that accepts requests and returns data or performs actions. Endpoints are typically documented with required parameters, response formats, and error codes.

Q: How do I authenticate with an API?

Common methods include API keys, OAuth 2.0 flows for delegated access, and JSON Web Tokens (JWTs). Choose mechanisms that match your security needs and rotate credentials regularly.

Q: When should I use WebSockets vs REST?

Use REST for request/response interactions and batch queries. Use WebSockets (or similar streaming protocols) when you need continuous, low-latency updates such as live market data or notifications.

Q: How can I test and sandbox an API safely?

Use provider sandbox environments or testnet endpoints for blockchain calls. Mock external APIs during unit testing and run integration tests against staging keys to validate behavior without impacting production systems.

Q: Are there standards for API design?

Yes. RESTful conventions, OpenAPI/Swagger documentation, and GraphQL schemas are common standards that improve discoverability and ease client generation. Following consistent naming, pagination, and error practices reduces onboarding friction.

Disclaimer: This article is for educational and informational purposes only. It explains technical concepts, implementation patterns, and evaluation criteria for APIs. It is not investment, legal, or security advice. Conduct your own due diligence before integrating third-party services.

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Token Metrics Team
Token Metrics Team

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Research

Altcoins on the Rise: How Bitcoin’s Stability Is Fueling the Next Market Wave

Token Metrics Team
6 min
MIN

As Bitcoin stabilizes near its recent highs, the crypto market is witnessing a familiar pattern — altcoins are beginning to surge. While Bitcoin often leads during the early phases of a bullish cycle, history shows that capital tends to flow into altcoins as confidence builds. In the past two weeks, this transition has become increasingly evident, with several promising projects capturing significant market attention.

Bitcoin’s Stabilization and What It Means

Since early July, Bitcoin has managed to hold above key resistance levels, cementing its role as the market’s anchor. At the time of writing, total crypto market capitalization hovers near $4 trillion — a level that hasn’t been seen since the previous cycle’s peaks. Historically, when Bitcoin consolidates above its former highs, capital begins rotating into altcoins. This shift often marks the start of a broader rally across the market.

Key takeaway: The current market appears to be in the early stages of this altcoin rotation.

Altcoins Leading the Charge

Several altcoins have emerged as strong contenders in recent weeks.

1. Zora: The Social Token Platform
Zora, an on-chain social platform that allows creators to tokenize posts and earn from their content, has seen exponential growth following its integration into the Base App (Coinbase’s rebranded wallet). Creator activity and transaction volumes have surged, driving up demand for the Zora token. With each creator post paired to the Zora token, this integration has created a direct link between platform usage and token utility.

Why it matters: The combination of Web3 social media and creator monetization is a powerful narrative, and Zora appears well-positioned to capitalize on this trend.

2. Spark: A MakerDAO-Connected Lending Platform
Spark, a DeFi lending protocol linked to Sky Protocol, has also been a standout performer. It recently experienced a sharp increase in liquidity and price action, fueled by its integration with CookieDAO’s campaign and ongoing airdrop programs.

Why it matters: With DeFi gaining renewed interest, protocols offering sustainable yields through established ecosystems like Sky Protocol (formerly MakerDAO) are likely to remain attractive to both retail and institutional participants.

3. Sahara AI: Building the AI-Crypto Intersection
Sahara AI has positioned itself at the intersection of AI and blockchain. Backed by Binance, Polychain, and Foresight Ventures, this project offers a full-stack AI solution tailored for decentralized applications. Its long-term vision of creating AI-enabled Web3 services is attracting both developers and investors.

Why it matters: AI and crypto remain two of the most dominant narratives in tech, and projects combining these sectors could drive the next wave of innovation.

4. PancakeSwap: Undervalued Giant?
Despite being one of the largest DEXs by trading volume and daily fee generation, PancakeSwap appears significantly undervalued compared to peers like Uniswap. The platform recently expanded its operations to other chains, including Solana, and benefits from strong integration with the Binance Wallet ecosystem.

Why it matters: Fundamentals suggest PancakeSwap has room for growth if the market re-rates its value relative to competitors.

Market Themes to Watch

Bitcoin vs. Altcoin Season:
Our analysis shows we are still in a Bitcoin-dominant phase. Historically, altcoins outperform when Bitcoin consolidates or cools off. This implies that the current rotation into altcoins could continue as capital flows down the risk curve.

DeFi Revival:
Protocols like Blackhole DEX on Avalanche — which has grown its TVL from $7 million to $193 million in less than 2 weeks — highlight a renewed interest in decentralized finance. Unlike VC-backed models, Blackhole’s community-first tokenomics have resonated with users seeking fairer distribution.

Social Tokens & AI Integration:
Platforms like Zora and Sahara AI are tapping into major growth narratives: decentralized social media and artificial intelligence. Both sectors are likely to see continued experimentation and adoption.

Managing Risk in Altcoin Investing

While the upside potential in altcoins is high, so is the volatility. For high-risk trades, such as “moonshots” (low-cap tokens under $50 million market cap), we recommend:

  • Position sizing: Limit exposure to 1% per trade.
  • Diversification: Spread investments across multiple projects to reduce single-token risk.
  • Exit planning: Pre-define take-profit and stop-loss levels.

Conclusion

The crypto market is entering an exciting phase. Bitcoin’s consolidation above key levels suggests a healthy backdrop for risk assets, and altcoins are beginning to benefit. From creator monetization platforms like Zora to cross-chain DeFi protocols like Spark and Black Hole, this new wave of projects represents the diversity and innovation driving the next cycle.

As always, measured participation and disciplined risk management remain essential.

Crypto Basics

Types of Stablecoins: A Complete Guide for 2025

Token Metrics Team
8 min
MIN

The cryptocurrency market is famous for volatility—Bitcoin can swing by thousands of dollars in a day, and altcoins can rise or crash in hours. But what if you need price stability? That’s where stablecoins come in.

Stablecoins are digital currencies pegged to stable assets like the US dollar, gold, or even algorithmically maintained price levels. They bridge the gap between the speed and efficiency of blockchain technology and the reliability of traditional money.

As of 2025, stablecoins account for over $140 billion in circulating supply, making them essential for traders, investors, and decentralized finance (DeFi) users. But not all stablecoins are the same—different types use different mechanisms to maintain their stability, each with unique pros and cons.

In this guide, we’ll break down the types of stablecoins, how they work, their risks, and which might be best for your needs.

What Are Stablecoins?

A stablecoin is a cryptocurrency designed to maintain a stable value by pegging its price to a reference asset. Most stablecoins are pegged to fiat currencies like the U.S. dollar (e.g., 1 USDT ≈ $1), but some track commodities (like gold) or are algorithmically balanced to hold value.

They are widely used for:

  • Trading: Moving quickly in and out of volatile assets.
  • DeFi: Providing liquidity, borrowing, and earning yields.
  • Remittances: Sending low-cost, fast cross-border payments.
  • Hedging: Protecting against crypto market volatility.

Types of Stablecoins

There are four main types of stablecoins:

  1. Fiat‑Collateralized Stablecoins
  2. Crypto‑Collateralized Stablecoins
  3. Algorithmic (Non‑Collateralized) Stablecoins
  4. Commodity‑Backed Stablecoins

Each has a different method of maintaining its peg. Let’s break them down.

1. Fiat‑Collateralized Stablecoins

Definition:
These are backed 1:1 by traditional currencies like the U.S. dollar, euro, or yen. For every stablecoin issued, an equivalent amount of fiat is held in reserve by a trusted custodian.

How They Work:
If you buy 1 USDC, Circle (its issuer) holds $1 in a regulated bank account or short-term U.S. Treasury securities. When you redeem that stablecoin, the issuer sends you the equivalent amount in fiat and burns the coin.

Examples:

  • Tether (USDT) – Largest stablecoin by market cap; widely used on exchanges.
  • USD Coin (USDC) – Issued by Circle, fully regulated and audited.
  • TrueUSD (TUSD) – Offers real-time attestation of reserves.
  • PayPal USD (PYUSD) – Launched by PayPal for payments and DeFi.

Pros:

  • High stability – Pegged directly to fiat.
  • Transparent – Many provide audits and attestations.
  • Easy adoption – Ideal for traders, merchants, and payment platforms.

Cons:

  • Centralization – Custodians control reserves and can freeze accounts.
  • Regulatory risks – Subject to government oversight.
  • Less transparency for some issuers – (e.g., Tether faced scrutiny over its reserves).

2. Crypto‑Collateralized Stablecoins

Definition:
These are backed by cryptocurrencies like Ethereum or Bitcoin instead of fiat. Because crypto is volatile, these stablecoins are overcollateralized (e.g., $150 in ETH backs $100 in stablecoins).

How They Work:
When you mint a crypto-backed stablecoin like DAI, you deposit collateral (e.g., ETH) into a smart contract. If the collateral value drops too much, the contract automatically liquidates some assets to maintain the peg.

Examples:

  • DAI – Issued by MakerDAO, backed by ETH, USDC, and other assets.

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  • sUSD – A synthetic USD issued by Synthetix.
  • MIM (Magic Internet Money) – Collateralized by multiple crypto assets.

Pros:

  • Decentralized – No single company controls reserves.
  • Transparent – All collateral balances are viewable on-chain.
  • Resistant to censorship – Issuers can’t freeze accounts.

Cons:

  • Volatility risk – Collateral can lose value quickly, requiring liquidations.
  • Overcollateralization – Ties up more capital than fiat-backed options.
  • Complexity – Requires understanding of DeFi mechanics.

3. Algorithmic (Non‑Collateralized) Stablecoins

Definition:
These don’t use physical reserves. Instead, they maintain their peg via algorithmic supply adjustments—minting or burning tokens to balance price around $1.

How They Work:
If demand increases and the price rises above $1, the protocol mints more coins. If it falls below $1, the protocol burns coins or incentivizes users to buy them back.

Examples:

  • Ampleforth (AMPL) – Elastic supply adjusts daily.
  • UST (TerraUSD) – Infamously collapsed in 2022 after its peg broke.
  • Frax (FRAX) – Uses a hybrid model: partly collateralized, partly algorithmic.

Pros:

  • Highly capital-efficient – Doesn’t require large reserves.
  • Decentralized – Often governed by smart contracts and DAOs.

Cons:

  • Peg instability – Prone to “death spirals” when market confidence drops.
  • Complex mechanisms – Harder for average users to understand.
  • History of failures – UST/LUNA crash eroded trust in algorithmic coins.

4. Commodity‑Backed Stablecoins

Definition:
These stablecoins are pegged to commodities like gold, silver, or oil, giving them intrinsic value beyond fiat.

How They Work:
For every coin issued, an equivalent amount of the commodity is held in a secure vault. For example, owning 1 PAX Gold (PAXG) means you own 1 troy ounce of physical gold stored by the issuer.

Examples:

  • PAX Gold (PAXG) – Backed by physical gold.

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  • Tether Gold (XAUT) – Gold-backed token from Tether.
  • Digix Gold (DGX) – Pegged to gold bars in Singapore vaults.

Pros:

  • Hedge against inflation – Commodities like gold retain value during economic uncertainty.
  • Diversification – Offers exposure to both crypto and commodities.

Cons:

  • Low liquidity – Less widely used than fiat-backed stablecoins.
  • Storage & audit challenges – Requires trust in the issuer to maintain reserves.

Why Do Stablecoins Matter?

Stablecoins are the backbone of DeFi and crypto trading.

  • Trading & arbitrage: They provide a quick way to exit volatile positions without converting back to fiat.
  • Cross-border payments: Cheaper and faster than SWIFT or remittance services.
  • DeFi participation: Essential for lending, borrowing, yield farming, and liquidity pools.
  • On-ramp/off-ramp: They simplify converting between traditional finance and blockchain.

Which Type of Stablecoin Should You Use?

If you want simplicity & security: Go with fiat-backed coins like USDC or PYUSD.

If you value decentralization: Choose crypto-collateralized options like DAI.

If you’re comfortable with high risk: Explore algorithmic models like FRAX (but beware of peg risks).

If you want inflation protection: Consider commodity-backed coins like PAXG.

Key Risks of Stablecoins

  • Regulation: Governments are increasing oversight of fiat-backed coins.
  • Centralization: Some issuers can freeze funds or blacklist wallets.
  • Smart contract risks: DeFi-based stablecoins can suffer from bugs or exploits.
  • Peg breaks: Algorithmic models are especially vulnerable to confidence loss.

The Future of Stablecoins

In 2025, stablecoins are evolving to meet regulatory and market demands:

  • Central Bank Digital Currencies (CBDCs): Governments are issuing digital dollars and euros, potentially competing with stablecoins.
  • Regulated issuers: Projects like USDC are working closely with regulators to ensure compliance.
  • Hybrid models: Combining fiat and algorithmic elements (e.g., Frax) to enhance stability.

As DeFi expands and global adoption grows, stablecoins will remain at the heart of crypto finance.

Final Thoughts

Stablecoins are more than just “digital dollars.” They’re a critical bridge between traditional finance and blockchain innovation.

  • Fiat-backed stablecoins bring stability and ease of use.
  • Crypto-collateralized ones offer transparency and decentralization.
  • Algorithmic models push innovation but carry higher risks.
  • Commodity-backed coins provide a hedge against inflation and diversify exposure.

Choosing the right type depends on your risk tolerance, use case, and trust level. Whether for trading, saving, or participating in DeFi, understanding the types of stablecoins can help you navigate the crypto ecosystem with confidence.

Crypto Basics

How Do You Purchase Cryptocurrency? A Beginner’s Step-by-Step Guide (2025)

Token Metrics Team
8 min
MIN

Cryptocurrency has moved from niche tech circles to the mainstream, with millions of people worldwide investing in Bitcoin, Ethereum, and thousands of other digital assets. Whether you want to trade actively, hold long-term, or explore decentralized finance (DeFi), the first step is understanding how to purchase cryptocurrency safely and efficiently.

In this guide, we’ll walk you through everything you need to know—**from choosing the right platform to securing your crypto—**so you can get started with confidence.

Step 1: Understand What Cryptocurrency Is

Before you dive in, it’s important to understand what you’re buying. Cryptocurrency is a digital asset that uses blockchain technology to enable secure, decentralized transactions. Unlike traditional currencies, crypto isn’t controlled by banks or governments.

Some of the most popular cryptocurrencies include:

  • Ethereum (ETH): A blockchain supporting smart contracts and decentralized applications.

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  • Stablecoins (USDT, USDC): Pegged to fiat currencies like the US dollar for stability.
  • Altcoins: Thousands of other coins with unique use cases (Solana, Cardano, etc.).

Once you know your options, you’re ready to buy.

Step 2: Choose a Cryptocurrency Exchange

To purchase crypto, you’ll need an exchange—a platform that lets you buy, sell, and trade digital assets.

Types of exchanges:

  1. Centralized Exchanges (CEX): User-friendly and beginner-friendly. Examples: Coinbase, Binance, Kraken, eToro.
  2. Decentralized Exchanges (DEX): Peer-to-peer trading directly from your wallet (Uniswap, PancakeSwap). Better for experienced users.
  3. Brokerage Apps: Apps like PayPal, Cash App, Robinhood let you buy crypto, though withdrawals may be limited.

What to look for in an exchange:

  • Security: Two-factor authentication (2FA), insurance, and strong history.
  • Fees: Look for transparent trading, deposit, and withdrawal fees.
  • Supported assets: Ensure your chosen exchange lists the coins you want.
  • Regulation: Use platforms compliant with your country’s laws.

Step 3: Create and Verify Your Account

Most centralized exchanges require Know Your Customer (KYC) verification for security and regulatory compliance.

What you’ll need:

  • Email & phone number: For account creation.
  • Government-issued ID: Passport, driver’s license, or national ID.
  • Proof of address: Sometimes required for higher transaction limits.

Once verified, you’ll gain full access to trading and withdrawals.

Step 4: Deposit Funds Into Your Account

You can’t buy crypto without adding funds.

Common payment methods:

  • Bank transfers: Usually the cheapest option but may take 1–3 days.
  • Debit/Credit cards: Fast but with higher fees (often 2–4%).
  • E-wallets & PayPal: Convenient but may have limits.
  • P2P transfers: Directly buy from other users (on platforms like Binance P2P).

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Pro Tip: Always compare deposit fees before funding your account.

Step 5: Choose Which Cryptocurrency to Buy

Beginners often start with Bitcoin or Ethereum due to their liquidity and stability. However, thousands of altcoins are available—each with unique purposes.

Factors to consider before buying:

  • Market cap: Large-cap coins are generally less volatile.
  • Project fundamentals: Check the coin’s whitepaper and team.
  • Use case & community: Active projects with strong ecosystems are more promising.
  • Volatility: Understand the risks of smaller, high-reward tokens.

Step 6: Place Your Order

When you’re ready, navigate to the Buy/Sell section of your exchange.

Order types:

  • Market Order: Instantly buys at the current price. Best for beginners.
  • Limit Order: Sets a specific price at which to buy. Great for strategic entry.
  • Recurring Buy: Automates purchases (also known as dollar-cost averaging).

Example: If Bitcoin is $50,000 and you want to buy $100 worth, your market order will instantly execute at the best available price.

Step 7: Store Your Cryptocurrency Safely

Once purchased, you’ll need a wallet to store your crypto. Leaving assets on an exchange can expose you to hacking risks.

Types of wallets:

  • Hot Wallets: Online, exchange-based, or software wallets (MetaMask, Trust Wallet). Easy to use but more vulnerable.
  • Cold Wallets: Offline storage like Ledger or Trezor hardware wallets. Ideal for long-term security.

Tip: “Not your keys, not your coins.” If you hold significant funds, transfer them to a private wallet where you control the keys.

Step 8: Stay Informed and Manage Your Investment

Crypto markets are volatile. Prices can change rapidly, so keep track of market trends and news.

Best practices:

  • Set alerts: Use tools like Token Metrics or CoinMarketCap to monitor prices.
  • Diversify: Don’t put all your money in one coin.
  • Avoid emotional trading: Stick to your plan and avoid panic-buying or selling.
  • Use security tools: Enable 2FA and avoid sharing sensitive information.

How Much Should You Invest in Crypto?

Only invest what you can afford to lose. Experts often recommend starting with 1–5% of your portfolio and increasing gradually as you gain confidence.

Common Mistakes to Avoid When Buying Crypto

  1. Skipping research: Don’t buy a coin just because it’s trending.
  2. Using unsecured exchanges: Stick to reputable platforms.
  3. Not securing your wallet: Leaving funds on exchanges long-term.
  4. Falling for scams: Avoid too-good-to-be-true offers and unverified projects.
  5. Overtrading: Excessive buying/selling leads to higher fees and losses.

FAQs: Buying Cryptocurrency

1. Can I buy crypto without an exchange?
Yes. You can use peer-to-peer platforms or crypto ATMs, though fees may be higher.

2. Do I need a lot of money to start?
No. Many exchanges let you buy as little as $10 worth of crypto.

3. Is buying crypto legal?
In most countries, yes. Always check your local regulations.

4. What’s the safest way to buy?
Use a regulated exchange and store your funds in a hardware wallet.

Final Thoughts: Getting Started with Cryptocurrency

Purchasing cryptocurrency isn’t complicated—it’s about choosing the right platform, securing your funds, and investing wisely. Whether you’re buying Bitcoin as a long-term investment or exploring altcoins for potential growth, the steps are the same:

  1. Pick a reliable exchange
  2. Verify and fund your account
  3. Select your crypto and buy
  4. Secure it in a private wallet

The crypto market is full of opportunities—but also risks. Start small, do your research, and approach your investment journey with a long-term mindset.

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