Research

Top Free APIs Every Developer Should Know in 2024

Discover the best free-to-use APIs for crypto, AI, and data apps. See which trusted APIs developers rely on for robust features, reliability, and easy integration.
Token Metrics Team
5
MIN

APIs are the silent workhorses powering today’s most innovative software. Whether you’re a crypto enthusiast automating portfolio analysis, or a web developer looking to enrich your app with real-time data, the right free API can supercharge your project—and your productivity. But with thousands out there, which free APIs truly stand out for reliability, ease of use, and breadth of features?

Why Free APIs Matter for Developers and Innovators

APIs—Application Programming Interfaces—allow applications to seamlessly interact, share insights, and build on each other's strengths. The best free-to-use APIs democratize access to powerful datasets, functionalities, and market signals. For crypto, AI, fintech, or simply creative digital projects, high-quality APIs can:

  • Accelerate product development with ready-made data and processing tools
  • Enable experiments in new tech areas without initial investment
  • Foster community-driven innovation thanks to open documentation and easy onboarding

However, not all free APIs are created equal. Some offer limited usage tiers, outdated data, or spotty reliability. That’s why informed selection is crucial, especially for mission-critical apps.

Top Free APIs for Cryptocurrency and Blockchain Projects

The crypto landscape thrives on transparency and timely data. For enthusiasts building bots, dashboards, or research tools, these free APIs consistently earn praise:

  • CoinGecko API: Delivers comprehensive token prices, volumes, and market data. Free tier includes generous rate limits and supports thousands of assets.
  • CoinMarketCap Public API: Offers price feeds and historical data for cryptocurrencies, ideal for analysts and monitoring tools.
  • Etherscan API: The go-to source for Ethereum blockchain explorers, enabling developers to fetch address balances, smart contract source, and token transactions for free.
  • Glassnode API (Free Tier): On-chain metrics and indicators, including supply activity and network health, are freely accessible for non-commercial use.

These APIs are often foundational building blocks for portfolio trackers, on-chain analytics, and even education platforms. Crucially, they’re maintained, well-documented, and support broad application ranges without requiring payment—or personal information—at the entry level.

Best Free APIs Across Data, AI, and Web Development

If your project stretches beyond crypto, the open web is full of powerful (yet freely accessible) APIs for various domains:

  1. OpenWeatherMap API: Real-time and forecast weather data for any global location. Great for travel, logistics, and even DeFi insurance products.
  2. NewsAPI: Aggregates global headlines and breaking news. Many developers use it for sentiment dashboards, trend-following, or daily newsletters.
  3. OpenAI API (trial/limited free tier): Enables natural language understanding, chatbots, and text processing. Developers can access some GPT models for experimentation on a free plan.
  4. RapidAPI Hub: A directory hosting hundreds of free-to-use APIs in every possible category—from sports to sentiment analysis. RapidAPI offers unified onboarding and monitoring.
  5. Public-APIs (GitHub Community List): An open-source, crowd-curated list of categorized free APIs, kept up to date for AI, datasets, image processing, and more.

These tools let you build everything from machine learning prototypes to hobbyist weather notifiers. Carefully review usage limits and (where relevant) data privacy arrangements as you scale your innovation.

How to Choose and Integrate Free APIs Securely

Not every free API is equally reliable or secure. Situations to consider include:

  • Data Accuracy and Uptime: Ensure the provider offers a clear SLA or uptime history, especially for finance or real-time apps.
  • Privacy: Favor APIs that don’t require sensitive personal data unless absolutely necessary.
  • API Limits and Scaling: Free tiers are often rate-limited. Consider future upgrades and monitor usage to avoid service interruptions.
  • Documentation and Community: Well-documented APIs, ideally with samples and open forums, accelerate integration and reduce confusion.

When integrating, secure your keys in environment variables, use HTTPS endpoints, and avoid exposing credentials in public sources. Always plan for error handling and fail-safes.

The Growing Role of Free APIs in AI and Analytics

The explosion of AI-generated insights and predictive analytics owes much to accessible APIs. With free endpoints for data labeling, model inference, and sentiment tracking, even small development teams can launch powerful, AI-enhanced products. Projects like Hugging Face’s free models hub or the OpenAI playground democratize once-complex capabilities, unlocking new digital frontiers for research and public good.

For crypto analysis, AI-backed APIs—like those from Token Metrics—combine quantitative techniques and machine learning to highlight actionable trends and on-chain activity. As free API ecosystems expand, expect an even richer toolbox for developers at every skill level.

Build Smarter Crypto Apps & AI Agents with Token Metrics

Token Metrics provides real-time prices, trading signals, and on-chain insights all from one powerful API. Grab a Free API Key

What is an API and why are they essential in crypto or AI?

APIs let different software systems communicate and share data or services. In crypto, APIs deliver live price data, transaction histories, and on-chain analytics. In AI, APIs allow access to model inference, data labeling, and natural language processing, lowering barriers for developers and researchers.

Are free APIs truly reliable for production use?

Many free APIs maintain high uptime and data accuracy, especially those from reputable organizations. However, they may have stricter rate limits, fewer support options, or evolving terms. For mission-critical operations, always implement redundancy and review official service level commitments.

Which are the best free APIs for cryptocurrency analysis?

Popular options include CoinGecko, CoinMarketCap, and Etherscan for price and blockchain data. For AI-driven insights, platforms like Token Metrics provide actionable intelligence with robust free tiers.

How do I keep my API keys and data secure?

Never hardcode keys in public repos or client-side code. Use secure storage (environment variables or vaults), enforce HTTPS, rotate keys regularly, and monitor API access logs to identify anomalies.

What should I check before integrating any free API?

Review documentation, data freshness, rate limits, provider reputation, privacy compliance, and supported SDKs. Test endpoints in your dev environment and plan for graceful error handling to ensure resilience.

Disclaimer

This article is for informational purposes only and does not constitute financial, investment, or legal advice. Always perform due diligence when evaluating APIs, tools, or digital assets. No endorsement is implied. Third-party API providers may change terms at any time; verify details before production use.

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AI Agents in Minutes, Not Months
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Token Metrics Team
Token Metrics Team

Recent Posts

Research

Top 10 Crypto Exchanges in the UK in 2025 | Best Crypto Trading Platforms

Token Metrics Team
8 min
MIN

Cryptocurrency adoption in the UK is booming. From retail investors to hedge funds, crypto is no longer just an experiment—it’s part of a diversified financial portfolio. But in this rapidly evolving space, smart traders know that picking the right tools and platforms is the key to staying ahead.

Before we explore the best crypto trading exchanges in the UK, let’s look at the most important development in the crypto world—AI crypto trading. And there’s one platform leading that revolution: Token Metrics.

Token Metrics – The AI Crypto Trading Platform Changing the Game

While Token Metrics is not a cryptocurrency exchange, it has emerged as the best crypto trading platform in 2025 for UK investors and traders who want to trade smarter—not harder.

Token Metrics empowers users with AI-driven insights, predictive analytics, and cutting-edge data tools to identify the best crypto opportunities—before the rest of the market catches on.

🔍 Why Token Metrics Stands Out:

  • AI-Powered Ratings: Each token is scored by proprietary machine learning models across technical, fundamental, and sentiment metrics.
  • Bullish/Bearish Signal Alerts: AI alerts when a token shows early signs of momentum or reversal—perfect for timing entries and exits.
  • Moonshot Reports: Exclusive weekly research highlighting potential 10x–100x altcoins, vetted by AI and analysts.
  • Indices & Portfolios: Build thematic or risk-adjusted portfolios using automated AI indices for DeFi, AI, L2s, and more.
  • On-Chain + Social Metrics: Discover low-cap gems by tracking whale wallet activity, social buzz, DEX listings, and more.

💡 Bottom Line: Token Metrics doesn’t execute trades—but it helps you decide what to trade, when to trade, and why. Use it alongside any UK-compliant exchange for maximum edge in your trading strategy.

Understanding Crypto Before You Trade

What Are Cryptocurrencies?

Cryptocurrencies are digital assets built on blockchain technology. They use encryption to secure transactions, verify ownership, and eliminate the need for banks or central authorities. Examples include:

  • Bitcoin (BTC) – The original store of value
  • Ethereum (ETH) – Smart contracts and dApps
  • Solana (SOL), Polygon (MATIC) – High-speed chains
  • Meme coins, AI tokens, DeFi tokens – Specialized thematic plays

What Types of Crypto Trading Are There?

1. Spot Trading

Buying/selling crypto directly at current market prices. Simple and most widely used.

2. Margin Trading

Borrowing funds to trade larger amounts. Higher risk, higher reward.

3. Futures & Derivatives

Trading contracts that speculate on price movement without owning the asset.

4. Copy Trading

Follow and replicate the trades of pro traders or algorithms.

5. AI Crypto Trading

Using platforms like Token Metrics to leverage predictive AI models for smarter decisions.

Types of Crypto Trading Platforms

🏦 Centralized Exchanges (CEX)

Platforms like Coinbase, Binance, and Kraken that offer easy fiat access, trading dashboards, and custody.

🔄 Decentralized Exchanges (DEX)

Platforms like Uniswap, where you retain custody of assets and trade peer-to-peer.

đź§  Research-Driven Platforms (like Token Metrics)

Offer AI tools, analytics, and predictive insights—but don’t hold funds or execute trades directly.

Top 10 Crypto Exchanges in the UK in 2025

1. Binance UK

Still the largest exchange by volume, Binance offers UK users an FCA-compliant experience, GBP on-ramps, and access to a wide range of tokens.

âś… Best For: Altcoin traders, low fees
⚡ Highlight: Advanced charts, staking, futures, and Launchpad access

2. Coinbase UK

One of the most beginner-friendly platforms, Coinbase remains popular in the UK for its ease of use and trusted reputation.

âś… Best For: Beginners, long-term investors
⚡ Highlight: Clean mobile app, FCA-regulated, secure cold storage

3. Kraken

Trusted globally, Kraken offers advanced tools for pro traders, plus staking and futures. Fully operational in the UK.

âś… Best For: Intermediate to advanced traders
⚡ Highlight: Strong security and deep liquidity

4. Bitstamp

A European favorite with strong UK adoption, Bitstamp delivers a solid spot trading experience with a clean interface and high compliance standards.

âś… Best For: Conservative investors, fiat pairs
⚡ Highlight: Transparent fee structure and institutional API access

5. Gemini

Founded by the Winklevoss twins, Gemini UK is known for its high security standards and regulatory compliance. It supports GBP deposits and insurance-backed wallets.

âś… Best For: Safety-first traders
⚡ Highlight: Secure vaults, mobile-first UX

6. eToro

eToro mixes crypto with stocks, commodities, and social trading. It’s regulated in the UK and offers a unique copy trading feature.

âś… Best For: Passive investors, social traders
⚡ Highlight: Copy top crypto traders and track performance

7. OKX

With a growing UK presence, OKX is gaining favor for its low fees, wide token selection, and powerful trading suite.

âś… Best For: Futures, DeFi integrations
⚡ Highlight: Dual-mode trading—CEX and DEX options

8. Bitget

Bitget is quickly becoming a go-to platform for futures trading and copy trading. It has expanded its services to be compliant with UK standards.

âś… Best For: Derivatives and social trading
⚡ Highlight: Intuitive futures interface, low latency execution

9. Luno

Luno is a beginner-friendly cryptocurrency exchange operating under FCA registration in the UK. It supports GBP deposits and offers a smooth mobile app experience ideal for new users looking to buy their first Bitcoin or Ethereum.

âś… Best For: First-time crypto investors
⚡ Highlight: Easy interface, auto-buy options, strong regulatory posture in the UK

10. Zumo

A UK-born platform, Zumo focuses on sustainability, regulatory compliance, and mobile-first investing. It allows GBP deposits and offers a simple experience for UK users.

âś… Best For: Beginners and green investors
⚡ Highlight: Carbon-neutral platform and local support

Which Exchange Should You Choose?

  • For Beginners: Coinbase, Zumo, Gemini
  • For Altcoin Access: Binance, OKX
  • For Futures: Bitget, Kraken
  • For Social Trading: eToro
  • For Eco-conscious Trading: Zumo
  • For Institutional Tools: Bitstamp, Kraken
  • And for Smart Research: Combine any of the above with Token Metrics

FAQs

Q: Can I use Token Metrics with my exchange?
Absolutely. Token Metrics helps you analyze what to trade. You can execute on any exchange listed above.

Q: Is crypto trading legal in the UK?
Yes, as long as it’s done through FCA-compliant platforms. Tax laws apply.

Q: What fees should I expect?
Centralized exchanges charge trading fees (0.1%–0.5%) and possibly withdrawal or conversion fees.

Q: Is AI crypto trading reliable?
Yes, when paired with due diligence. Token Metrics uses AI to provide data-driven insights, not financial advice.

Conclusion

The UK crypto trading scene in 2025 is more mature, regulated, and accessible than ever before. Choosing the best crypto trading exchanges is only part of the equation. To truly succeed in this fast-moving market, you need tools that help you trade smarter.

That’s where AI crypto trading platforms like Token Metrics come in. Combine a regulated exchange with AI-powered analysis, and you’ll give yourself the edge every trader dreams of.

Start trading smarter today.

👉 Explore Token Metrics – The future of crypto investing, powered by AI

Crypto Basics

Are There Crypto Indices for DeFi, AI, and Other Sectors? Exploring Thematic Index Investing in 2025

Token Metrics Team
8 min
MIN

In the fast-moving world of crypto, one of the smartest ways to invest in 2025 is by aligning your portfolio with emerging narratives. Whether it’s DeFi, AI, Memecoins, or Real World Assets (RWAs), crypto’s growth is fueled by themes—and the easiest way to capitalize on them is through sector-based crypto indices.

But are there crypto indices tailored to specific sectors?
Absolutely. In fact, thematic crypto indices are one of the hottest trends in index-based investing right now.

This article explores the most popular sector-based crypto indices in 2025, how they work, and how you can use them to build a diversified, trend-aligned portfolio.

What Is a Thematic or Sector-Based Crypto Index?

A sector-based crypto index is a basket of cryptocurrencies selected based on a specific theme or market narrative. Instead of tracking the overall market, these indices focus on high-growth areas such as:

  • Decentralized Finance (DeFi)
  • Artificial Intelligence (AI) Tokens
  • Memecoins
  • Real World Assets (RWA)
  • Layer 1 Blockchains
  • Gaming / Metaverse

Each index includes multiple tokens within that category, allowing investors to gain exposure to the entire theme without picking individual winners.

Why Sector Indices Matter in 2025

In today’s market, performance is narrative-driven. A single meme can send a coin flying, or a regulatory shift can pump RWAs. Sector indices help investors:

âś… Capitalize on trends early
âś… Avoid single-token risk
âś… Ride sector momentum without constant research
âś… Balance exposure across tokens within a theme

Instead of trying to guess which AI token will win, you can hold the AI Index and benefit from the entire trend.

Top Sector-Based Crypto Indices in 2025

Here are the most popular and best-performing thematic indices this year:

1. Token Metrics AI Tokens Index

Focus: Artificial Intelligence & Agent Economy
Constituents: FET, AGIX, GRT, TAO, NUM, OCEAN
Management: AI-powered with weekly rebalancing

Why It’s Hot:
AI is dominating tech and crypto alike. This index tracks high-conviction AI tokens and rotates into bullish ones each week. Its performance outpaced most passive indices during Q1 2025.

2. Token Metrics DeFi Index

Focus: Core DeFi protocols
Constituents: AAVE, LDO, UNI, RUNE, DYDX, GMX
Management: AI-managed, rebalanced weekly

Why It’s Hot:
DeFi is crypto’s infrastructure. This index rotates into projects showing strength in TVL, volume, and sentiment—giving you DeFi exposure without the need to manage protocol risk manually.

3. Token Metrics Memecoin Index

Focus: Viral meme tokens
Constituents: DOGE, SHIB, PEPE, WIF, BONK, FLOKI
Management: AI-powered signals and weekly adjustments

Why It’s Hot:
This index tracks social momentum and market sentiment, allowing traders to ride the waves while mitigating downside through AI-powered exits.

4. Token Metrics RWA Index

Focus: Real World Asset tokens
Constituents: MKR, ONDO, POLYX, XDC, CFG
Management: Thematic + risk-adjusted AI overlay

Why It’s Hot:
The RWA narrative is exploding as institutions tokenize bonds, treasuries, and assets. This index includes top-performing RWA projects with liquidity and regulatory traction.

5. Token Metrics Layer 1 Index

Focus: Smart contract platforms
Constituents: ETH, SOL, AVAX, NEAR, SUI, TON
Management: Passive or AI-optimized version

Why It’s Hot:
The infrastructure battle among Layer 1s continues. This index provides broad exposure to the platforms that power most of Web3.

6. Index Coop DPI (DeFi Pulse Index)

Focus: Leading Ethereum DeFi protocols
Constituents: AAVE, UNI, COMP, SNX, LRC
Management: DAO-governed, passive rebalance

Why It’s Hot:
DPI is the OG DeFi index—trusted, decentralized, and consistently rebalanced on-chain.

7. Phuture Custom Indices

Focus: User-created strategies
Constituents: Fully customizable
Management: On-chain rules, community-driven

Why It’s Hot:
Create your own sector index or invest in curated strategies. Fully composable within DeFi.

How to Choose the Right Sector Index

Choosing the best sector-based index depends on your goals and your belief in specific narratives.

AI vs. Passive Sector Indices

Many sector indices today are AI-powered, meaning they adjust weights and tokens dynamically based on real-time data. This is especially useful in volatile or hype-driven narratives (like Memecoins or AI tokens).

Where to Invest in Sector-Based Indices

Here’s where to find and invest in thematic indices:

  • âś… Token Metrics – Sector-specific AI indices with weekly signals
  • âś… Index Coop – Ethereum-based DeFi indices with DAO governance
  • âś… Phuture – On-chain, user-customized index strategies
  • âś… Set Protocol – Technical and trend-driven portfolios
  • âś… Centralized Brokers – Limited thematic access (e.g., Bitwise)

You can access these using fiat, stablecoins, or crypto wallets depending on the platform.

Final Thoughts: Sector Indices Help You Invest in What Matters

In 2025, the biggest opportunities in crypto are often found in narrative-driven sectors. Whether it’s AI, DeFi, Memecoins, or tokenized real-world assets, sector-based crypto indices offer:

  • Smart diversification
  • Aligned exposure to growing trends
  • Hands-free portfolio management
  • Reduced risk of picking the wrong token

For the best results, explore platforms like Token Metrics, where AI-enhanced sector indices help you adapt to the market and capitalize on breakout themes with data-backed precision.

Crypto Basics

Where Can I Invest in the Crypto Index? Best Platforms to Start in 2025

Token Metrics Team
8 min
MIN

Crypto index investing has exploded in popularity as more investors look for smarter, simpler ways to grow their portfolios without tracking hundreds of tokens. But one of the most important questions to ask in 2025 is:

‍Where can I actually invest in crypto indices?

From passive funds to AI-powered smart portfolios, there are now several high-quality platforms that offer access to crypto indices—both centralized and on-chain.

In this guide, we’ll break down the best places to invest in crypto indices, what each platform offers, how they work, and which type of investor each is best for.

What Does It Mean to Invest in a Crypto Index?

Investing in a crypto index means buying into a portfolio of cryptocurrencies that tracks:

  • The overall market (Top 10/25 tokens)
  • A narrative (AI, DeFi, Memecoins, Layer 1s, etc.)
  • A strategy (passive, active, or AI-managed)

The index handles rebalancing, asset weighting, and selection, allowing you to focus on growth—not micromanaging trades.

Platforms today offer access through:

  • Web dashboards
  • Mobile apps
  • On-chain tokenized indices
  • Brokerage platforms (in regulated markets)

Best Platforms to Invest in Crypto Indices in 2025

Here are the leading platforms based on performance, ease of use, index variety, and technology.

1. Token Metrics

Type: Centralized + AI-Powered
Access: Web-based dashboard
Best For: Smart retail investors, growth-focused portfolios

Key Features:

  • AI-powered indices with weekly rebalancing
  • Sector-based themes: Memecoins, AI, DeFi, RWA, Layer 1s
  • Passive HODL indices (Top 5, 10, 25, 100)
  • Real-time signal tracking and market insights

Why It’s Great:

Token Metrics offers the most intelligent index engine in the market. It uses 80+ data points per token (momentum, sentiment, technicals, etc.) to adjust portfolios weekly—automatically allocating to bullish tokens and exiting risky ones.

2. Bitwise Asset Management

Type: Traditional / Regulated
Access: Available via brokerages (Fidelity, Schwab)
Best For: Institutions, conservative investors, U.S.-based users

Key Features:

  • BITW (Bitwise 10 Index Fund): Tracks the top 10 cryptocurrencies
  • Institutional-grade custody and compliance
  • Passive strategy with periodic rebalancing

Why It’s Great:

Bitwise is ideal for investors looking for regulated exposure to crypto without managing private keys or wallets. It's simple, safe, and SEC-compliant.

3. Index Coop

Type: DAO-governed / On-chain
Access: Web3 wallet (e.g., MetaMask)
Best For: DeFi-native investors, DAO supporters

Key Features:

  • DeFi Pulse Index (DPI)
  • Metaverse Index (MVI)
  • Bankless GMI Index (innovation-focused)
  • Community-driven governance

Why It’s Great:

Index Coop is 100% decentralized. Investors can buy index tokens on-chain, hold them in their wallets, and participate in DAO governance if they wish.

4. Phuture Finance

Type: On-chain Index Protocol
Access: DApp + Web3 wallets
Best For: Developers, yield hunters, DeFi builders

Key Features:

  • Sector-based indices with real-time rebalancing
  • User-created custom indices
  • Full composability with DeFi protocols

Why It’s Great:

Phuture allows custom index creation, making it ideal for investors or DAOs looking to launch their own strategies. Fully non-custodial.

5. Tokensets (Set Protocol)

Type: Strategy Index Protocol
Access: On-chain via Ethereum or Polygon
Best For: Advanced DeFi users, automated traders

Key Features:

  • Strategy-based indices using technical indicators (RSI, moving averages)
  • Create or follow “Set Strategies”
  • Tokenized exposure via ERC-20 index tokens

Why It’s Great:

Tokensets bring active trading strategies into index form, letting you automate trades based on predefined logic—perfect for traders who want hands-free execution.

Comparison Table

How to Start Investing in a Crypto Index

Step 1: Choose Your Platform

Pick based on your profile: centralized vs. decentralized, active vs. passive.

Step 2: Choose an Index

Select based on theme (e.g., DeFi, AI), market cap (e.g., Top 10), or strategy (AI-powered, yield-focused).

Step 3: Fund Your Account or Wallet

Use fiat, stablecoins, or crypto—depending on the platform.

Step 4: Monitor or Automate

Passive indices need little attention. AI or strategy indices may benefit from weekly check-ins to track rebalancing or updates.

Tips for Choosing the Right Platform

âś… Want automated, data-driven investing? Use Token Metrics AI Indices
âś… Want regulated, TradFi exposure? Use Bitwise
âś… Want DeFi-native exposure? Use Index Coop
âś… Want to launch your own index? Use Phuture
âś… Want auto-trading with technical rules? Use Tokensets

Final Thoughts: The Best Place to Start Is Where You Feel in Control

In 2025, crypto indices are everywhere—but not all platforms are created equal.

  • For maximum performance with AI-driven signals, Token Metrics is unmatched.
  • For institutional access, Bitwise is the gold standard.
  • For full decentralization, Index Coop, Phuture, and Tokensets lead the charge.

No matter your background, there’s a crypto index platform designed for you. All it takes is a few clicks to get started with smarter, diversified crypto investing.

Choose from Platinum, Gold, and Silver packages
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Craft your own custom ad—from banners to tailored copy
Perfect for Crypto Exchanges, SaaS Tools, DeFi, and AI Products