On November 19, 2015, Ethereum developer Fabian Vogelsteller submitted a proposal that would quietly become one of the most consequential documents in the history of cryptocurrency. The Ethereum Request for Comments 20 — better known as ERC-20 — was a technical standard for creating tokens on the Ethereum blockchain. At the time, Ethereum itself was trading at a humble $0.91, and the broader crypto market was a fraction of what it would become. Nobody could have predicted that this simple interface specification would eventually underpin trillions of dollars in tokenized value.
TL;DR
- ERC-20 was proposed by Fabian Vogelsteller on November 19, 2015, as a standard interface for tokens on Ethereum
- At the time, Ethereum traded at just $0.91 with a market cap of roughly $68.7 million
- The standard defined six core functions: totalSupply, balanceOf, transfer, transferFrom, approve, and allowance
- Bitcoin dominated the market at $357 with a $5.3 billion market cap, while Ethereum ranked fourth behind LTC and XRP
- ERC-20 would later enable the ICO boom of 2017, DeFi summer of 2020, and the entire modern token economy
A Fragmented Token Landscape Before ERC-20
Before ERC-20, creating a token on Ethereum was an exercise in reinventing the wheel. Every developer who wanted to build a token had to write their own smart contract from scratch, implementing unique transfer mechanics, balance tracking, and approval logic. This created a deeply fragmented ecosystem where wallets, exchanges, and other applications had to write custom integration code for every single token.
The problem was not just technical inefficiency — it was a barrier to adoption. If every token spoke a different language, how could any application reasonably support more than a handful of them? Vogelsteller, who was also the creator of the Mist browser and the web3.js library, recognized that Ethereum needed a common tongue.
The Six Functions That Started It All
The ERC-20 specification was elegantly simple. It defined a standard interface requiring just six core methods: totalSupply() to check the total token supply, balanceOf() to query any wallet balance, transfer() to send tokens directly, transferFrom() to allow delegated transfers, approve() to grant spending permissions, and allowance() to check those permissions. Three optional methods — name(), symbol(), and decimals() — provided human-readable metadata.
This minimalist approach was deliberate. By keeping the interface lean, Vogelsteller ensured that any developer could implement ERC-20 without significant overhead, while applications could interact with any compliant token using identical code.
The Market Context: A Crypto World in Transition
The crypto landscape in late November 2015 looked dramatically different from today. Bitcoin dominated with a price of $357 and a market capitalization of $5.3 billion. Litecoin sat at number two with a price of $3.52 and a market cap of $152.7 million, followed by XRP at $0.0042 with a $142 million market cap. Ethereum ranked fourth at $0.91 with a market cap of just $68.7 million — a rounding error compared to Bitcoin dominance.
The total crypto market was worth roughly $5.6 billion. For context, that is less than 0.3% of where the market would eventually peak. Ethereum had launched its Frontier network only three months earlier in July 2015, and the concept of smart contracts was still largely theoretical in most investors minds.
Why ERC-20 Mattered More Than Anyone Realized
The genius of ERC-20 was not in its complexity but in its universality. By creating a shared standard, it enabled what economists call network effects — each new token built on ERC-20 made every existing ERC-20 integration more valuable. Exchanges only needed to write one integration. Wallets only needed one token management module. DEX protocols could list any compliant token automatically.
This standardization would prove to be the critical infrastructure enabling the ICO boom of 2017, when thousands of projects raised billions of dollars by issuing ERC-20 tokens. Without a common standard, that wave of tokenization would have been logistically impossible. Every exchange listing, every wallet integration, every DEX pair would have required bespoke development.
Further downstream, ERC-20 became the backbone of Decentralized Finance. Compound, Uniswap, Aave, MakerDAO — the entire DeFi stack was built on the assumption that tokens follow the ERC-20 interface. The standard enabled composability, the ability for different smart contracts to interact with tokens predictably and safely.
Ethereum Position in Late 2015
When ERC-20 was proposed, Ethereum was still finding its identity. The network had processed its genesis block in July 2015, and the broader developer community was just beginning to explore what smart contracts could do. Vitalik Buterin, who co-authored the ERC-20 proposal alongside Vogelsteller, was still a relatively unknown figure outside the crypto niche.
The proposal itself was created on November 19, 2015, and while it generated discussion among Ethereum developers, it did not immediately trigger widespread excitement. It would take nearly two years — and the formalization as EIP-20 in 2017 — before the standard was formally recognized in the Ethereum Improvement Proposals system.
Why This Matters
Looking back from a world where ERC-20 tokens represent hundreds of billions of dollars in value, it is easy to forget how unremarkable the proposal seemed at the time. There were no headlines in mainstream financial media. No venture capital firms issued statements. The crypto market continued its quiet November rhythm with Bitcoin consolidating around $357.
But November 2015 was a pivotal month for Ethereum and for the entire trajectory of tokenized assets. The ERC-20 standard proved that sometimes the most impactful innovations are not the flashy protocol launches or billion-dollar funding rounds — they are the quiet, meticulous efforts to create shared infrastructure. Without ERC-20, the token economy as we know it would not exist. No ICOs, no DeFi, no NFT platforms built on ERC-20 adjacent standards, no billion-dollar token ecosystems. It all traces back to a single proposal submitted by a developer who saw that the future of blockchain needed a common language.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Cryptocurrency markets are highly volatile. Always do your own research before making investment decisions.