Research

How Crypto APIs Deliver On-Chain Data: Transactions & Wallet Balances Explained

Discover how crypto APIs supply on-chain data—like wallet balances and transactions—for developers, analysts, and crypto enthusiasts. Explore API use cases and what to look for in a provider.
Token Metrics Team
6
MIN

The explosive growth of crypto assets and decentralized protocols has fueled demand for accurate, real-time blockchain data. Whether you’re building an application, performing due diligence, or exploring on-chain analytics, knowing how to access transactions and wallet balances is crucial. But do crypto APIs actually provide this level of on-chain data—and how can you use it effectively?

What Are Crypto APIs and Why Are They Essential?

Crypto APIs (Application Programming Interfaces) are software gateways that let applications interact with blockchains and related services without managing full nodes or direct infrastructure. These APIs power wallets, portfolio trackers, analytics dashboards, and AI-driven research tools with everything from price feeds to in-depth blockchain data.

Why use a crypto API? Running your own blockchain node can be resource-intensive, requiring disk space, bandwidth, security practices, and ongoing maintenance. An API abstracts this complexity, providing developers and analysts with curated endpoints for questing data on-demand. This is particularly valuable for applications that need:

  • Up-to-date transaction histories
  • Current wallet balances across tokens and networks
  • Wallet activity details
  • Aggregated analytics, like smart money flows and DeFi positions

The Types of On-Chain Data Crypto APIs Provide

On-chain data refers to all the information stored directly on blockchain ledgers. Crypto APIs tap into different layers of this data, including:

  • Transaction Data: Hashes, timestamps, senders, receivers, transferred assets, gas fees, and contract interactions.
  • Wallet Balances: Query current holdings of native coins (like ETH or BTC) and tokens (such as ERC-20s), and sometimes even NFTs.
  • Historical Address Activity: Complete transactional history of wallets, letting you analyze behavioral trends or audit activity.
  • Smart Contract Events: Details about token transfers, liquidity provision, swaps, or governance votes.
  • Network/Protocol Stats: Blockchain metrics like block times, mining data, and node health, important for infrastructure and analytics teams.

Modern crypto APIs go beyond simple read-access, offering data enrichment features such as address labels, scam alerts, and portfolio reconstruction. This enables AI-driven tools and traders to make sense of raw blockchain transactions with greater ease.

How Do Crypto APIs Fetch and Deliver On-Chain Data?

The process of serving real-time, reliable on-chain data is complex. Here’s how reputable API providers typically operate:

  1. Node Infrastructure: Providers run full nodes for each supported blockchain, ingesting every new block.
  2. Data Indexing: Data is parsed, structured, and indexed for fast lookups—allowing APIs to serve requests instantly, even for complex queries.
  3. Aggregation & Enrichment: Some platforms aggregate data across multiple chains or enhance raw data with analytics, labels, or risk scores, helping to contextualize wallet activity.
  4. API Layer Exposure: RESTful or GraphQL endpoints expose this information for developers and researchers.

For example, querying for a wallet’s balance generally involves calling an endpoint such as /address/{wallet}/balances, which returns all supported tokens and quantities for that wallet, directly from on-chain sources. Transaction history requests retrieve confirmed transfers and contract activities, often with additional tags for clarity.

Key Use Cases for On-Chain Transaction and Balance Data

On-chain data accessed via crypto APIs has become foundational in several scenarios:

  • Tracking Portfolio Value: Automated tools instantly aggregate wallet balances and transaction histories across multiple addresses, networks, and asset types.
  • Due Diligence & Audit: On-chain data reveals the actual movement of funds, enabling independent scrutiny for compliance, proof-of-reserves, and forensic analysis.
  • Developing dApps & DeFi Services: Most wallets, swaps, and lending apps rely on APIs to provide balance updates, confirm transactions, and fetch historical activity.
  • On-Chain Analytics: Researchers and AI models monitor whale activity, wallet clustering, and token flows to identify ecosystem trends.
  • Risk Management: Platforms use API-provided on-chain labels to detect scam addresses, risky protocols, or suspicious transaction patterns.

In addition, many quantitative research teams and AI-driven crypto tools ingest on-chain data through APIs to fuel predictive models, market research, and smart contract insights.

Choosing a Crypto API Provider: Essential Parameters

With dozens of API solutions available, consider the following when selecting a crypto API for on-chain data:

  • Data Completeness: Ensure the API supports the networks and asset types you need (e.g., native coins, tokens, NFTs).
  • Latency & Reliability: Fast data delivery and high uptime are critical for real-time trading applications and research automation.
  • Rate Limits & Pricing: Be mindful of free tier restrictions versus your anticipated query volume.
  • Data Enrichment: Does the provider offer wallet labels, scam detection, or analytics layers?
  • Documentation & Support: Robust docs and support channels make integrations smoother and troubleshooting faster.

If you’re integrating advanced analytics or AI-driven insights, prioritize API providers that combine raw on-chain access with actionable, processed intelligence.

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FAQs on Crypto APIs and On-Chain Data

Can I access wallet balances and transaction histories via crypto APIs?

Yes, leading crypto API providers typically offer endpoints to retrieve wallet balances (for both native cryptocurrencies and supported tokens) and to view transaction histories, directly sourced from underlying blockchain ledgers. This streamlines personal portfolio tracking, due diligence, and analytics development.

Are crypto API data outputs reliable and up-to-date?

Reputable API providers maintain robust blockchain node infrastructure and update their databases in real time or near-real time. However, reliability also depends on network congestion, API rate limits, and provider-specific infrastructure. Always review service status and latency commitments before integrating for mission-critical use cases.

Do all crypto APIs support on-chain data for NFTs and Layer-2 networks?

No, coverage varies between providers. Some APIs offer comprehensive data across layer-1 (e.g., Ethereum, Bitcoin) and select layer-2 chains, while others may focus on specific asset classes or blockchains. Likewise, NFT balance and transaction endpoints are only available with APIs that index non-fungible token contracts. Always confirm network and asset support with your chosen provider.

How can developers integrate crypto API on-chain data into their apps?

Most APIs provide REST or GraphQL endpoints that can be queried using common programming languages or HTTP tools. Comprehensive documentation and SDKs (where available) guide developers through authentication, request parameters, and data formatting, making it straightforward to embed wallet balances, transaction lists, or on-chain analytics into web, desktop, or mobile applications.

What are the main benefits of using an API over running a own node?

Using a crypto API saves significant time and resources. Infrastructure, sync issues, storage maintenance, and security are handled by the provider. APIs also enrich data, aggregate multi-chain information, and simplify compliance and access controls, which can be much more complex and costly to reproduce independently.

Disclaimer

This article is for educational purposes and reference only. It does not constitute financial advice, crypto trading recommendations, or any endorsement of specific assets, platforms, or services. Please conduct your own research before making decisions involving digital assets or blockchain technologies.

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Recent Posts

Crypto Basics

How to Earn Crypto in 2024? 7 Simple Ways [Answered]

S. Vishwa
6 Minutes
MIN

If you are looking for ways to earn free crypto this year, in 2024, this is the place to be. Yes, it is possible to earn free cryptocurrency by participating in certain activities or using certain services. For example, some websites and apps offer rewards in the form of cryptocurrency for completing tasks, such as answering surveys or watching videos.

Additionally, some cryptocurrencies, such as Bitcoin and Ethereum, can be earned through a process called mining, in which individuals use their computer's processing power to help verify and record transactions on the blockchain.

However, it is important to be cautious when seeking out opportunities to earn free cryptocurrency, as there are many scams and fraudulent schemes that claim to offer free crypto but actually steal users' personal information or funds. It is always a good idea to thoroughly research any opportunity before participating and to use only trusted and reputable sources.

How to Earn Free Crypto?

Many people never invest in cryptocurrencies due to fear of losing their money, or because they do not have enough money to invest in the first place. However, there are several ways to get cryptocurrencies for free without risking any of your own money.

Let's explore them all.

Learn and Earn Platforms

Learn and Earn platforms are a great way to earn free crypto while also gaining knowledge about the industry. These platforms, such as Coinbase and CoinMarketCap, offer users the opportunity to learn about specific coins and earn rewards in exchange.

To participate in a Learn and Earn platform, users typically need to open an account and pass a KYC verification. Once verified, users can access educational materials and quizzes on the platform, and earn rewards for completing them. These platforms regularly update their offerings, so it is important to check back frequently to see what new opportunities are available.

Airdrops

Airdrops are a popular method of earning free crypto. These are marketing campaigns drawn up by new crypto platforms to gain visibility and increase their customer base. As part of their marketing strategy, these platforms give out free coins to new and existing users in exchange for creating awareness about their project.

To qualify for an airdrop, users must typically be active crypto traders or at least have a crypto wallet. Airdrops can be a win-win for both the trading platform and the user, as the platform gains visibility and the user earns free crypto.

Play-To-Earn Games

Play-to-earn games are a fun and exciting way to earn free crypto. These games allow users to have fun while also earning rewards in the form of crypto. Examples of these games include CoinHunt World, where users can explore a digital environment and earn rewards for finding keys and answering trivia questions, and Crypto Popcoin, where users can earn rewards by grouping cryptocurrencies together and popping them.

To earn actual crypto through these games, users typically need to register their ERC-20 wallet address and have the real crypto token airdropped to their account. Some games may also allow users to earn crypto through their Coinbase account.

Cryptocurrency Dividends

Cryptocurrency dividends are a new way for investors to earn passive income through their digital assets. Similar to traditional stocks, some cryptocurrencies offer dividend payments to their holders as a reward for holding their tokens for a specific period.

These payments can be in the form of additional tokens or other cryptocurrencies, depending on the protocol. For instance, some blockchain networks offer staking rewards to users who lock up their coins to secure the network, while others distribute a portion of their transaction fees to token holders.

By earning crypto through dividends, investors can benefit from both capital appreciation and recurring income, potentially increasing their overall returns on investment. However, as with any investment, it is crucial to do thorough research and assess the risks before committing funds to any cryptocurrency project.

Credit Cards

One way to earn crypto through credit cards is by using a credit card that offers rewards or cashback in the form of cryptocurrency. Several credit card companies now offer rewards in a form of cryptocurrencies. Users can earn rewards on their purchases and then transfer the earned crypto to their digital wallet.

Another option is to use a crypto credit card, which allows users to earn rewards in cryptocurrency directly. These cards work like traditional credit cards, but instead of earning cashback or points, users earn crypto rewards that can be redeemed for various products and services.

Referral Bonuses

Referral bonuses are a common way for people to earn cryptocurrency without necessarily making a direct investment or engaging in trading. Referral programs are typically offered by cryptocurrency exchanges, wallets, and other platforms that offer a commission or bonus for referring new users to their services.

To earn crypto through referral bonuses, individuals simply need to share their unique referral links with friends, family, and acquaintances who might be interested in using the platform. When someone signs up using the link and completes certain actions, such as making a deposit or trading, the referrer receives a bonus in cryptocurrency.

Referral bonuses can vary in size and scope, but they can be a great way to earn crypto passively and without having to invest a significant amount of time or money.

Browser and Search Engine Rewards

Some search engines and browsers, such as Brave and Pre-search, offer rewards in the form of crypto for viewing ads or just browsing. This is a simple and easy way to earn free crypto without having to invest any money.

While earning free crypto can be a great way to get started in the world of cryptocurrency, it is important to be cautious. This is because not all opportunities to earn free crypto are legitimate or safe.

There are many scams and fraudulent schemes that claim to offer free crypto, but are actually designed to steal users' personal information or funds. These scams can take many forms, such as fake airdrops, fake games, or fake search engines that promise rewards but never actually deliver on them.

Conclusion

Therefore, it is important for users to carefully research and verify any opportunity to earn free crypto before participating. They should look for reputable platforms and sources, and be wary of any offers that seem too good to be true.

Additionally, users should always protect their personal information and crypto assets by using secure wallets and following best practices for online security.

Disclaimer

The information provided on this website does not constitute investment advice, financial advice, trading advice, or any other advice, and you should not treat any of the website's content as such.

Token Metrics does not recommend buying, selling, or holding any cryptocurrency. Conduct your due diligence and consult your financial advisor before making investment decisions.

Crypto Basics

What is Web 3.0? Web 1 vs Web 2 vs Web 3 | Explained

Token Metrics Team
6 minutes
MIN

If you're wondering what is Web 3, this is the place to be.

In this article, we'll learn more about the evolution of web over time, and what's next.

Evolution of Web

Being around for 3 decades, the internet has gone through multiple stages of evolution. With each evolution comes new tools and applications relevant to modern-day users, leading us to Web 3.0.

The first generation of the web is called Web 1.0. As the earliest version of the internet, it is known as the “read-only web”. As its name implies, web users can look up facts and information and read upon it. Websites were basic and had very limited functions.

When it comes to  Web 1.0, there is a lack of interactions that takes place between online internet content and internet users. Sites are not interactive and there are no contributions, alterations, or impacts that can be made by the average website visitor. Most common from the 1990s to 2005, Web 1.0 connected information with users.

This lack of interaction made Web 1.0 flat and stationary. As the name suggests, “the read-only Web” lacks the forms, visuals, controls, and interactivity we enjoy on today’s Internet. The developers of Web 1.0 sites typically build their sites and develop in text or graphic format.

Static websites and personal sites would be considered part of Web 1.0. Unlike today where many websites aim for high traffic and user return rates, content distributed on Web 1.0 may be useful but does not give people a reason to return.

Web 3.0, also known as the semantic web, is the current stage of the evolution of the web. It is characterized by the use of artificial intelligence and machine learning to create a more intuitive and personalized web experience.

Web 3.0 also enables the integration of data from multiple sources and the creation of intelligent, self-learning systems that can understand the meaning and context of information on the web. This stage of the web is still in development, but it promises to bring significant advancements in terms of user experience and the ability of the web to connect and analyze data.

Web 3.0 – The New Internet

The future stages of the internet will be built on public blockchains. Blockchains are distributed databases that are shared among a number of computer networks. Web 3.0 is decentralized, which means there is no central authority. This is possible because with Web 3.0, information is stored in multiple locations concurrently.

Additionally, because it is trustless and permissionless, anyone can interact with the web without permission from a middleman. This gives users the freedom to interact with the web privately or publicly without having to trust a middleman.

With Web 3.0, individuals finally have the ability to own and govern parts of the internet, rather than relying on companies like Google or Facebook to access it.

Web 3.0 is still very new, and we have not even come close to unlocking its full potential. Characteristics of Web 3.0 can already be seen in blockchain games, the Metaverse, and decentralized finance.

In short, Web 3.0 allows users to interact, exchange information, and securely facilitate different types of transactions without a central authority, which means that Web 3.0 users become content owners rather than just content users.

Advantages of Web 3.0

Web 3.0 offers several key benefits to users, including:

  1. Ownership and control of personal data and information: In Web 3.0, control and access to personal data and information is returned to the user. This means that users will have complete ownership and control over their data, while still being able to share it on a permission-based or case-by-case basis.
  2. Access to information from anywhere: One of the main benefits of Web 3.0 is the ability to access data and information from anywhere, using only a smartphone or computer. This technology aims to expand on current ideas and allow devices to collect and share user data, making it more widely accessible.
  3. Elimination of centralized control: Web 3.0 and blockchain technology allow for the creation of decentralized networks, where data is fully encrypted and unmodifiable. This eliminates the need for intermediaries, such as large companies or governments, to control user data.
  4. Permissionless blockchain technology: In Web 3.0, anyone can create an address and interact with the blockchain network with complete privacy and security. This means that users are not required to go through any kind of verification process, such as KYC checks, in order to access and use blockchain services.
  5. Constant availability of services: The use of decentralized networks and encrypted data storage in Web 3.0 means that services are less likely to be suspended or disrupted. Since there is no single point of failure, service disruption is minimized and users have constant access to their data.

Disadvantages of Web 3.0

However, there are also disadvantages to Web 3.0, including:

  1. Potential for increased cyber attacks: Decentralized networks and encrypted data storage make it more difficult for hackers to access and modify user data. However, this also makes it more difficult for security experts to detect and prevent attacks.
  2. Need for infrastructure changes: In order for Web 3.0 to be fully adopted, significant changes to current infrastructure will be necessary. This includes changes to network protocols and the development of new software and hardware.
  3. Early stage of development: Web 3.0 is still in its early stages of development, and has yet to be widely adopted. This means that there are still many challenges and uncertainties associated with the technology.
  4. Lack of understanding and education: Many people are not familiar with the concept of Web 3.0 and the benefits it offers. This lack of understanding can make it difficult for the technology to gain widespread acceptance.

Key Takeaways

The development of Web 3.0 represents a significant advancement in technology, offering users the ability to read, write, and own data and information. This technology is still in its early stages, but has the potential to break into other industries and change the way we think about data and information ownership. While there are benefits to using Web 3.0, there are also risks involved.

It is up to individuals to determine whether the rewards of using this technology outweigh the potential drawbacks. Overall, the development of Web 3.0 is a major event in the history of modern technology.

Research

How To Find New Crypto Coins? Finding Cryptocurrency Projects

Token Metrics Team
6 minutes
MIN

If you are wondering how to find new crypto coins, this is the place to be.

Finding new crypto coins has become important since the rise of Bitcoin and the wealth gained by early investors. The crypto market has experienced a surge of new investors who hope to find the next big coin, but many are unsure of how to navigate the space and identify new coins. It can be exciting to discover new coins, but it's important to beware of scams like the Squid token that exploited the popularity of the Squid Game movie series. Before looking for new crypto coins, here are some points to consider before making an investment decision.

Checklist Before Investing:

A project's whitepaper is a good starting point for researching a new crypto project. Most new crypto projects have a whitepaper or official document that includes information such as the project's use case, tokenomics, team members, and roadmap. The presence or absence of a whitepaper can tell you a lot about the project's seriousness. While reading a project's whitepaper, there are a few things to look out for:

Use case: This is the main problem that the crypto project is trying to solve, or its unique function. For example, there are several Layer 2 projects that aim to improve the low latency and transaction times of traditional blockchains without compromising security and decentralization.

Tokenomics / Token Economics: This is the basic plan for how the project's new crypto tokens will be distributed. This includes how many tokens will go to the founding team, advisors, how many will be available for sale to the community, how many will be in the treasury, and what type of token it will be (deflationary or inflationary, with a limited or unlimited supply).

Lock-up period: This is the period of time that the founding team agrees to lock up their tokens before they can access them. A longer lock-up period can give investors more confidence in the project's long-term commitment.

Founding team: It's important to check the background of the project's founding team. Are they experienced, do their backgrounds match the project, and do they have any fraudulent history with past projects? The profiles of the advisors and investors/backers of the project can also be useful.

Social virality: Decentralization is at the core of crypto, so projects are often community-driven. The growth of the project's community can be a good indicator of investor confidence. Twitter, Telegram, and Discord are popular platforms for building crypto communities.

Roadmap: The project's roadmap contains its major plans and timeline. This can indicate the project's seriousness, especially when compared to what they have accomplished. Have they achieved any of the earlier plans on the roadmap within the specified timeline?

In addition, looking at the number of people on the project's watchlist, and whether it is listed on CoinMarketCap.com or CoinGecko, can also be a good confidence booster.

How to Find New Crypto Coins

Before new crypto coins are listed on exchanges, they are often first offered as Initial Coin Offerings (ICOs), Initial Exchange Offerings (IEOs), or Initial Dex Offerings (IDOs). These offerings give investors the opportunity to get in early on projects before they go mainstream. This is where early investors can get into major projects before they are listed on crypto exchanges.

There are several platforms that feature upcoming crypto projects, including:

  • Top ICO List: This website provides white papers and one-pagers of ICOs of new crypto coins. You can find a comprehensive list of ICOs and information on some of the best ICOs in the market, as well as information on past ICOs to use as a benchmark for evaluating the performance of ICOs you are considering.
  • CoinGecko: This is a useful tool for crypto traders and investors to stay up to date with the market. It provides real-time prices of cryptocurrencies from multiple exchanges, as well as other important information about different cryptocurrencies, such as their historic performance data, community, and insights into the coin development. CoinGecko also provides an ICO list of new crypto coins with relevant information about the new crypto coin/project.
  • CoinMarketCap: Like CoinGecko, CoinMarketCap is an alternative that some investors use to find new crypto coins. It provides a list of ICOs and relevant information, as well as information on hundreds of other crypto projects and actionable data. The watchlist feature is also useful for seeing how many people are interested in a project.
  • ICO Bench: This is a useful tool for finding new crypto coins. ICO Bench is an ICO grading website that uses crowdsourced ratings from crypto traders and experts. The experts evaluate projects using various parameters and grade them accordingly.
  • Token Metrics: Token Metrics is another great resource for finding new cryptocurrencies with its research, deep dives, AI, and more. The best part is that you can use Token Metrics to evaluate whether the newly found project is good or bad and decide whether you should spend more time researching it further.

With over 10,000+ crypto coins, there are many opportunities out there. But there are also many shady platforms and crypto projects, so it's important to know how to find crypto with potential and make sure the projects are viable. Using the tips above can help you do that.

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