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ICO

An ICO (Initial Coin Offering) is a fundraising method where blockchain projects sell newly created tokens to investors in exchange for cryptocurrencies like Bitcoin or Ether.

General
Updated: Mar 19, 2026
Also known as: Initial Coin Offering token sale

What Is a ICO?

A ICO (Initial Coin Offering) is a fundraising method. Blockchain projects sell newly created tokens to investors. Investors pay with cryptocurrencies like Bitcoin or Ether. ICOs mimic initial public offerings (IPOs) but operate in a decentralized manner without traditional regulators.

Projects launch ICOs through these steps. First, they publish a whitepaper detailing the project, token utility, and roadmap. Next, developers deploy a smart contract on a blockchain like Ethereum. This contract holds funds and distributes tokens. Investors send cryptocurrency to the contract address during a set period. The smart contract automatically allocates tokens based on contributions, often with bonuses for early buyers. For example, a project might set a hard cap of 10 million Ether raised, issuing 1 billion tokens at 0.01 Ether each.

ICOs matter because they fueled crypto growth. They raised over $20 billion from 2017-2018, funding projects like EOS and Tezos. However, many failed or scammed investors, leading to losses. Regulators like the SEC now scrutinize ICOs as potential securities. This highlights security risks: investors must verify smart contracts, teams, and audits to avoid rug pulls or hacks.

Key characteristics include token types (utility for services, security for profits) and sale models. Fixed-price ICOs sell at one rate. Dynamic models use Dutch auctions, where prices drop over time. ICOs differ from STOs (Security Token Offerings), which comply with securities laws. Today, ICOs have declined, replaced by IDOs on decentralized exchanges.

BlockchainUTXO

UTXO (Unspent Transaction Output) is a unit of cryptocurrency from a previous transaction that remains unspent and serves as input for new transactions in blockchains like Bitcoin.

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BlockchainBitcoin

Bitcoin (BTC) is the first decentralized cryptocurrency, launched in 2009. It uses blockchain technology for secure, peer-to-peer digital transactions without intermediaries.

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BlockchainEthereum

Ethereum is a decentralized blockchain platform that enables smart contracts and decentralized applications (dApps). Its native cryptocurrency is Ether (ETH).

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GeneralWhitepaper

In cryptocurrency and blockchain, a whitepaper is a foundational document that outlines a project's technical details, goals, tokenomics, and roadmap.

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BlockchainToken

A token is a digital asset on a blockchain that represents value, ownership, utility, or access rights. Examples include ERC-20 tokens on Ethereum.

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GeneralCryptocurrency

Cryptocurrency is a digital or virtual currency secured by cryptography, operating on decentralized blockchain networks to enable secure, peer-to-peer transactions.

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Real-World Examples

Example 1: EOS ICO

The EOS project ran a year-long ICO from 2017 to 2018. Investors sent Ether to a smart contract. EOS raised over $4 billion and issued tokens for platform development.

Example 2: Hypothetical Project Launch

A DeFi project announces its ICO. It publishes a whitepaper outlining token use for lending. Developers deploy an Ethereum smart contract with a hard cap of 5 million USD equivalent. Early investors get bonuses: 20% more tokens for contributions in the first week.

  • Investor sends 1 ETH (worth $2,000) to contract address.
  • Contract returns 200,000 project tokens at $0.01 each.

Example 3: Investor Caution

Before joining the Tezos ICO in 2017, which raised $232 million, savvy investors verified the team's credentials and smart contract audit. This avoided risks like the 2017 Paragon ICO halt by the SEC for unregistered securities.

BlockchainEthereum

Ethereum is a decentralized blockchain platform that enables smart contracts and decentralized applications (dApps). Its native cryptocurrency is Ether (ETH).

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DefiDeFi

DeFi (Decentralized Finance) refers to a set of financial services, such as lending and trading, built on blockchain technology without traditional intermediaries like banks.

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GeneralWhitepaper

In cryptocurrency and blockchain, a whitepaper is a foundational document that outlines a project's technical details, goals, tokenomics, and roadmap.

Read full definition
BlockchainToken

A token is a digital asset on a blockchain that represents value, ownership, utility, or access rights. Examples include ERC-20 tokens on Ethereum.

Read full definition

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