Alonzo Upgrade Opens the Door for Cardano DApps

## What Is API3 (API3)?

Smart contracts often struggle to access dependable data, but application programming interfaces ([APIs](https://coinmarketcap.com/alexandria/glossary/api)) have been touted as a solution to this problem.

API3’s stated goal is to allow decentralized versions of APIs to be built, managed and monetized at scales. As blockchain technology plays an ever bigger role in the economy — from decentralized finance to supply chain management — the team behind this project says it has never been more important for smart contracts to provide “timely, reliable real-world data.”

The whitepaper for API3 was unveiled in September 2020 and set out the main problem that’s associated with APIs at present: connectivity. At present, there’s no way for smart contracts to establish a direct connection with APIs for the latest data — and this has led to an explosion in the popularity of oracles.

Although this has helped solve the problem to some extent, the industry has since been grappling with the “Blockchain Oracle Problem.” Oracles are a form of middleware that sit in between APIs and smart contracts — increasing costs and centralization. API3 intends to get around this problem by enabling API providers to operate their very own nodes.

API3’s token went live at the start of December following on from a token sale that generated tens of millions of dollars.


### Who Are the Founders of API3?

Three people have come together to bring API3 to life. The first is Heikki Vanttinen, who has written extensively about the project and what it hopes to achieve. He previously worked as founder and CEO at CLC Group, a blockchain lab “developing real-world connected smart contract solutions for a more trustless, efficient and secure future.” Vanttinen also served as chief marketing officer at Zippie, a mobile operating system that aims to help blockchain technology achieve mainstream adoption.

Vanttinen has been joined by Burak Benligiray. He also worked at CLC Group, serving as CTO. Benligiray has previously written posts highlighting the merits of ChainAPI, which serves as the integration platform for API3. This has been described as the “spiritual successor” to Honeycomb, which was one of the innovations that had been pursued by CLC Group.

And last but by no means least, the third co-founder at API3 is Saša Milić. As well as serving as a sessional lecturer at the University of Toronto, where she taught core curriculum courses to computer science students, she’s also worked as a software engineer for Facebook, and as a simulation data scientist for Gauntlet.


#### What Makes API3 Unique?

In the world of blockchain and crypto, we all too often hear about projects that are aiming to bring this technology to established industries such as real estate and finance. One of the most compelling attributes of API3 is how it’s aiming to fix some of the problems that have emerged within the blockchain space itself.

APIs are crucial because of how they supply blockchains with off-chain data — without it, these decentralized ledgers wouldn’t have a clue about how much coins should be worth.

In setting out why API3 is unique, Vanttinen explained how decentralized APIs can “provide superior data transparency all the way to the factual data source level, compared to existing decentralized oracles, which do not consider the data source API to be within the scope of their solution.”

Light and robust middleware called Airnode has been created to make API3 a reality — and the distinctive qualities of this tool concern how it can be deployed in minutes, enhancing transparency and substantially reducing transaction fees in the process.


#### Related Pages:

Read about [Chainlink](https://coinmarketcap.com/currencies/chainlink/), one of API3’s main competitors.

Learn about how oracles work in this [tech deep dive](https://coinmarketcap.com/alexandria/article/oracles-the-all-seeing-eye-that-guides-crypto-networks).

Discover the definitions of APIs and smart contracts in our [glossary](https://coinmarketcap.com/alexandria/glossary).

Subscribe to the CoinMarketCap [newsletter](https://coinmarketcap.com/alexandria/glossary).


#### How Many API3 (API3) Coins Are There in Circulation?

As of January 2020, CoinMarketCap data suggests that there are 13,847,549 API3 in circulation — out of a maximum supply of 100 million tokens.

While 15 million tokens have been distributed among pre-seed and seed investors, a further 20 million tokens were reserved for a public token distribution event that took place over the first two weeks of December. The founding team was allocated 30 million tokens, with 10 million going to partners and contributors. And finally, 25 million went to an ecosystem fund.

Tokens sold during a public sale are unlocked, but seed investors and founders are subject to a vesting period of between two and three years.


### How Is the API3 Network Secured?

API3 is an [ERC-20](https://coinmarketcap.com/alexandria/glossary/erc-20) token, meaning that it’s based on the [Ethereum](https://coinmarketcap.com/currencies/ethereum/) blockchain. 


### Where Can You Buy API3 (API3)?

One of the most popular exchanges where API3 can be purchased include [Uniswap](https://coinmarketcap.com/exchanges/uniswap-v2/), where it is paired with Wrapped ETH. It’s also available against USDT on Huobi Global and KuCoin, and paired with ETH on OKEx and 1inch. [Learn more about how to convert fiat currencies to crypto in our handy guide.](https://coinmarketcap.com/how-to-buy-bitcoin/)

API3

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Ten Best Coins

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4-CHAN

Band Protocol is a cross-chain data oracle platform that is able to take real-world data and supply it to on-chain applications, while also connecting APIs to smart-contracts to facilitate the exchange of information between on-chain and off-chain data sources.

By supplying reputable, verifiable real-world data to blockchains, Band Protocol unlocks a range of new use cases for developers to explore — since they can now use any type of real-world data as part of their decentralized application (DApp) logic, including sports, weather, random numbers, price feed data and more.

Band Protocol initially launched as an ERC-20 project on the Ethereum blockchain in September 2019, but transitioned to the Cosmos network in June 2020 with the release of Band Protocol 2.0. The new protocol is built on BandChain using the Cosmos SDK. Oracle nodes on BandChain not only relay data but are also involved in block production/validation, giving them a dual role.

BAND is the native token of the Band Protocol ecosystem and is used as collateral by validators involved in fulfilling data requests, as well as the main medium of exchange on BandChain — being used to paying for private data.

Band Protocol

Launched in 2017, Livepeer is the first live video streaming network protocol that is fully decentralized. The platform aims to become a viable blockchain-based, economically efficient alternative to centralized broadcasting solutions for all new and existing broadcaster companies.

To learn more about this project, check out our deep dive of Livepeer.

As stated in the official Livepeer whitepaper, the live video streaming and broadcasting industry is growing at a rapid pace, and the company is looking to ride this wave and introduce decentralization to the environment. Livepeer aims to streamline the broadcasting process by allowing producers to submit their work on the platform, taking care of reformatting and distributing the content to users and streaming platforms.

Livepeer

Ocean Protocol

UMA was founded in 2018 by Allison Lu and Hart Lambur, two ex Goldman Sachs traders, with the goal of making global markets universally fair, accessible, secure and decentralized.

The team drew inspiration from traditional finance derivatives to define an open-source protocol to allow anyone, anywhere, to design and build trustless financial contracts.

Balancer is an automated market maker (AMM) that was developed on the Ethereum blockchain and launched in March 2020. It was able to raise a $3M seed round by Placeholder and Accomplice. Balancer protocol functions as a self-balancing weighted portfolio, price sensor and liquidity provider. It allows users to earn profits through its recently introduced token ($BAL) by contributing to customizable liquidity pools.

To learn more about this project, check out our deep dive of Balancer(https://coinmarketcap.com/alexandria/article/what-is-balancer.

The protocol operates a few types of pools:

Private pools give the owner governance over the pool, and make the person the sole contributor of liquidity to the pool. Also, all the parameters are mutable by the owner.

Shared pools are for those who want to become liquidity providers (LPs). The LPs are rewarded with the Balancer Pool Tokens (BPTs).

Smart pools are similar to private pools but are controlled by a smart contract. They also reward using BPTs and allow anyone to contribute liquidity to the pool.

Balancer

Celo is a carbon-negative, permissionless, blockchain with a rich ecosystem of global partners building innovative Web3 dapps to support a more inclusive financial system. Accessible to anyone with a mobile phone, the Celo ecosystem consists of a decentralized, proof-of-stake blockchain technology stack (the Celo platform), CELO governance asset, and several Mento stable assets (cUSD, cEUR, cREAL) that allow for real-world users to use digital assets. The open source Celo mainnet launched on Earth Day 2020.  The Celo community passed an indicative on-chain governance proposal (temperature check) to have Celo migrate to an Ethereum layer-2.  Google Cloud, Deutsche Telekom, Telefonica, and many others run validators on the Celo Platform.  Today, the Platform supports 1,000+ projects in over 150 countries are building on Celo to, helping to create the conditions of prosperity for all.  For more information, please visit Celo.org.

Celo

Storj, pronounced as “storage,” is an open-source cloud storage platform. Basically, it uses a decentralized network of nodes to host user data. The platform also secures hosted data using advanced encryption.

In a white paper published in December,2014, Storj was first introduced to the world as a concept. It was to be a decentralized peer-to-peer encrypted cloud storage platform.

Two years later, an updated white paper was published. Here, a decentralized network  — connecting users who need cloud storage space with those who have hard drive space to sell — was described. The platform was launched in late 2018.

People with hard drive space and good internet connectivity can participate in the network. They become a unit in the network, called a node. Space providers are rewarded by Storj tokens.

Storj

Audius is a decentralized music streaming protocol initially built on POA network, but now living on Solana. Audius was launched to remedy the inefficiencies of the music industry, which is plagued by intransparent music rights ownership and intermediaries standing between artists and their audience.

Audius aims to align the interests of artists, fans, and node operators through its platform powered by its native AUDIO token. Artists can upload music, stored and distributed by content and discovery nodes, that fans can listen to for free. Currently, Audius rewards content creators through rewards like featuring in the weekly trending lists. In the future, it plans to integrate stablecoins for artists to offer paid content, as well as artist tokens that give fans the ability to access exclusive content, potentially cooperating with platforms like Rally.

Synthetix is building a decentralized liquidity provisioning protocol that any protocol can tap into for various purposes. Its deep liquidity and low fees serve as a backend for many exciting protocols on both Optimism and Ethereum. Many user-facing protocols in the Synthetix ecosystem, such as Kwenta (Spot and Futures), Lyra (Options), Polynomial (Automated Options), and 1inch & Curve (Atomic Swaps), tap into Synthetix liquidity to power their protocols. Synthetix is built on Optimism and Ethereum mainnet. The Synthetix Network is collateralized by SNX, ETH, and LUSD, enabling the issuance of synthetic assets (Synths). Synths track and provide returns on the underlying asset without requiring one to directly hold the asset. This pooled collateral enables an array of on-chain, composable financial instruments backed by liquidity from Synthetix. Some of the most exciting upcoming releases from SNX are Perps V2, which hopes to enable low-fee on-chain futures trading through the usage of off-chain oracles, and Synthetix V3, which aims to rebuild the protocol to achieve its earliest goal, being a fully permissionless derivatives protocol. Learn more about Synthetix on their blog or by joining the SNX Discord.

The platform aims to broaden the cryptocurrency space by introducing non-blockchain assets, providing access to a more robust financial market.

Synthetix

Arweave is a decentralized storage network that seeks to offer a platform for the indefinite storage of data. Describing itself as "a collectively owned hard drive that never forgets," the network primarily hosts "the permaweb" — a permanent, decentralized web with a number of community-driven applications and platforms.

To learn more about this project, check out our deep dive of Arweave.

The Arweave network uses a native cryptocurrency, AR, to pay "miners" to indefinitely store the network's information.

The project was first announced as Archain in August 2017, later rebranding to Arweave in February 2018 and officially launching in June 2018.

Arweave

SKALE, described as a modular blockchain network, is designed to bring scalability to Ethereum. SKALE is the only blockchain network capable of running an unlimited number of fast, on-demand, pooled-security Blockchains with zero gas fees to end users. These individual chains are known as SKALE chains and can be dapp-specific or shared.

The project’s website says it wants to enable people to build and run DApps in a “decentralized modular cloud built for real-world needs and configured for your requirements.” This emphasis on decentralization isn’t at the expense of security.

According to SKALE, those who build on this platform can run Solidity smart contracts “thousands of times faster at a fraction of the mainnet cost” — with games and content streaming services among the projects that already take advantage of its infrastructure.

SKALE

Mask Network is a protocol that allows its users to send encrypted messages over Twitter and Facebook. It essentially acts as a bridge between the internet and a decentralized network running on top.

Mask Network was initially launched in July 2019, with its first use case of allowing Facebook and Twitter users to encrypt posts on the social media platforms. It then raised $2 million in a funding round in November 2020, co-led by HashKey and Hash Global, and a further $3 million funding round in February 2021 with participation from Digital Currency Group and Fundamental Labs.

Now, Mask Network offers the ability to fund Gitcoin grant campaigns directly from Twitter, as well as plans to offer peer-to-peer payments and decentralized storage functionality. It is a decentralized portal that also allows users to use DApps like crypto payments, decentralized finance, decentralized storage, e-commerce (digital goods/NFTs) and decentralized organizations (DAO) over the top of existing social networks without migrating, creating what is referred to as a decentralized Applet (DApplet) ecosystem.

Mask Network

LRC is the Ethereum-based cryptocurrency token of Loopring, an open protocol designed for the building of decentralized crypto exchanges.

In 2020, the average daily trading volume of the entire cryptocurrency market fluctuated in the approximate range of $50-$200 million. Most of that trading is conducted on centralized cryptocurrency exchanges — online platforms operated by private companies that store users’ funds and facilitate the matching of buy and sell orders.

Such platforms have a number of downsides common to all of them, so a new type of exchange — decentralized— has emerged to try to alleviate these disadvantages. However, fully decentralized exchanges are not without their own flaws.

Loopring’s purported goal is to combine centralized order matching with decentralized on-blockchain order settlement into a hybridized product that will take the best aspects of both centralized and decentralized exchanges.

LRC tokens became available to the public during an initial coin offering (ICO) in August 2017, while the Loopring protocol was first deployed on Ethereum mainnet in December 2019.

Loopring

Numerai is an Ethereum-based platform allowing developers and data scientists to experiment and create machine learning models with improved reliability. The platform’s main goal is to bring decentralization to the data science field and allow developers to compete in creating effective machine learning prediction models.

Founded in late 2015 in San Francisco, Numerai claims to be the first hedge fund to launch a cryptocurrency on the market. Unlike traditional hedge funds, however, Numerai relies on the data and predictions produced by tournament participants to participate in the stock market. They claim to be the first hedge fund to use machine learning so heavily in its investment strategy.

Numeraire

Quant launched in June 2018 with the goal of connecting blockchains and networks on a global scale, without reducing the efficiency and interoperability of the network. It is the first project to solve the interoperability problem through the creation of the first blockchain operating system.

To learn more about this project, check out our deep dive of Quant.

The project is built as an operating system distributed ledger technology— and Overledger Network — for connecting different blockchain networks. The project is billed as the first OS to be built for blockchains.

The main aim of Quant — using Overledger — is to bridge the gap that exists between different blockchains. The backbone of the project is the Overledger network, which Quant bills as the ecosystem on which the future digital economy ecosystem will be built.

Overledger allows developers to build decentralized multi-chain applications (known as MApps) for their customers. For developers to build a Mapp on the network, they must hold a certain amount of Quant tokens (QNT).

Quant

The Graph is an indexing protocol for querying data for networks like Ethereum and IPFS, powering many applications in both DeFi and the broader Web3 ecosystem. Anyone can build and publish open APIs, called subgraphs, that applications can query using GraphQL to retrieve blockchain data. There is a hosted service in production that makes it easy for developers to get started building on The Graph and the decentralized network will be launching later this year. The Graph currently supports indexing data from Ethereum, IPFS and POA, with more networks coming soon.

To learn more about this project, check out our deep dive of The Graph.

To date, over3,000 subgraphs have been deployed by thousands of developers, for DApps like Uniswap, Synthetix, Aragon, AAVE, Gnosis, Balancer, Livepeer, DAOstack, Decentraland and many others. The Graph usage has been growing at over 50% MoM and hit over 7 billion queries during the month of September 2020.

The Graph has a global community, including over 200 Indexer Nodes in the testnet and more than 2,000 Curators in the Curator Program as of October 2020. To fund network development, The Graph raised funds from community members, strategic VCs and influential individuals in the blockchain community including Coinbase Ventures, DCG, Framework, ParaFi Capital, CoinFund, DTC, Multicoin, Reciprocal Ventures, SPC, Tally Capital and others. The Graph Foundation also successfully completed a public GRT Sale with participation from 99 countries (not including the U.S.). To date as of November 2020, The Graph has raised ~$25M.

The Graph

0x is an infrastructure protocol that allows users to easily trade ERC20 tokens and other assets on the many different blockchains (including Ethereum) without relying on centralized intermediaries. It is a protocol for decentralized exchange.

0x achieves this decentralized exchange functionality using a collection of open-source, publicly auditable smart contracts that work together to produce a flexible, low-friction trading protocol that developers can easily weave into their products.

The protocol is used by companies building web3 apps such as wallets, DEXes, portfolio trackes, and others. It is a used by hundreds of developers for their projects. The protocol has facilitates over $200B in trading volume since its inception. One can track its usage in its dedicated https://explorer.0x.org/.

The protocol is powered by an ERC20 governance token known as ZRX. ZRX holders can participate in protocol governance, having direct power over protocol changes and its community treasury.

0x Protocol

Moonbeam is an Ethereum-compatible smart contract parachain on Polkadot. Moonbeam makes it easy to use popular Ethereum developer tools to build or redeploy Solidity projects in a Substrate-based environment.

Moonbeam is much more than just an EVM implementation: it’s a highly specialized parachain that mirrors Ethereum’s Web3 RPC, accounts, keys, subscriptions, logs, and more. The Moonbeam platform extends the base Ethereum feature set with additional features such as on-chain governance, staking, and cross-chain integrations.

Moonbeam’s Ethereum compatibility is unmatched:

Minimal Changes: developers can use existing Solidity smart contracts right away, with no need to rewrite or reconfigure

Use Existing Developer Tools: connect popular tools like MetaMask, Hardhat, Waffle, Remix, and Truffle via a complete set of Web3 RPC endpoints. Use well-known Javascript libraries such as Web3.Js or Ethers.Js.

Unified Accounts, Addresses, and Signatures: use your existing Ethereum H160 accounts & ECDSA signatures to interact with Moonbeam

Tap into the Most Integrations on Polkadot: use existing oracles, bridges, wallets, and other tools that are already building on Moonbeam

Moonbeam provides integration and connectivity between Polkadot Parachains as well as with other chains such as Ethereum and Bitcoin via bridges. Moonbeam was started in 2019 by Derek Yoo of Pure Stake.

Moonbeam

Ethereum Name Service (ENS) is a distributed, open, and extensible naming system based on the Ethereum blockchain. ENS converts human-readable Ethereum addresses like john.eth into the machine-readable alphanumeric codes you know from wallets like Metamask. The reverse conversion -- associating metadata and machine-readable addresses with human-readable Ethereum addresses -- is also possible.

The goal of Ethereum Name Service is to make the Ethereum-based web easier to access and comprehend for humans - similar to how the Internet’s Domain Name Service makes the internet more accessible. Like DNS, ENS also uses a system of dot-separated hierarchical names called domains with domain owners fully controlling their subdomains.

ENS launched with a highly successful retroactive airdrop in November 2021 that rewarded users who had registered addresses before the project launched its token. However, in February 2022, it faced criticism over apparently homophobic tweets by its director of operations.

Ethereum Name Service

Immutable positions itself as the first layer-two scaling solution for NFTs on Ethereum. According to Immutable, its blockchain does away with Ethereum’s limitations like low scalability, a poor user experience, illiquidity, and a slow developer experience. Instead, users benefit from instant trading and massive scalability while enjoying zero gas fees for minting and trading NFTs without compromising user or asset security.

Thanks to this technology, users will be able to create and distribute assets like ERC-20 and ERC-721 tokens on a massive scale. Chris Clay, the game Director of Gods Unchained, a project already building on Immutable, stated that Immutable allows Gods Unchained to implement a new meta-system that was previously impossible. In this fashion, Immutable aims to create a world-class experience for users and developers alike.