Crypto Gloss

0x Protocol (ZRX)

0x Protocol is an open-source infrastructure layer for decentralized token exchange on Ethereum, using off-chain order relay and on-chain settlement to let any application integrate DEX trading without building its own liquidity layer. ZRX is the protocol’s governance token, used for voting on 0x DAO proposals and treasury grants.

Total Supply 1 billion ZRX
CoinGecko Live data
Stat Value
Ticker ZRX
Price $0.1083
Market Cap $91.89M
24h Change -2.70%
Circulating Supply 848.397 million ZRX
Max Supply 1 billion ZRX
All-Time High $2.50
Contract (Ethereum) 0xe41d…9f498
via ChangeNow · T&CsPrice data from CoinGecko as of 2026-10-22. Not financial advice.

How It Works

0x separates order creation from settlement, which is the key design insight behind the protocol:

  1. A maker signs an order off-chain specifying the token pair, amounts, and expiry. No gas is spent at this stage.
  2. The signed order is broadcast to a relayer — an off-chain order book operated by a third party (or directly peer-to-peer).
  3. A taker sees the order and decides to fill it. The taker submits the signed maker order to the 0x smart contract on-chain.
  4. The contract verifies the maker’s signature, checks the order is still valid and unfilled, and atomically swaps the tokens between the two parties.

Only the final settlement touches the blockchain, which dramatically reduces gas costs compared to fully on-chain AMM models like Uniswap v2.

0x API and Matcha

0x’s most widely used product is the 0x API — a DEX aggregator that routes trade orders across Uniswap, Curve, Balancer, and other liquidity sources to minimize slippage. Major wallets and apps integrate it: MetaMask Swaps, Coinbase Wallet, Zapper, and others route trades through 0x API under the hood.

Matcha (matcha.xyz) is 0x’s own consumer-facing DEX aggregator built on the same API, offering a clean trading interface for retail users.

ZRX Tokenomics and Supply

ZRX is the ERC-20 token associated with the 0x ecosystem. CoinGecko lists a maximum and total supply of 1 billion ZRX and about 848.397 million circulating. Those supply figures do not mean that the token receives trading fees or captures all value created by the 0x APIs.

  • Governance status: 0x’s support documentation says protocol governance is currently dormant and the Exchange Proxy was effectively deprecated after the Settler contracts were deployed in mid-2024.
  • Legacy staking: Older ZRX staking arrangements may require separate withdrawal steps. Check current official guidance before interacting with a staking contract.
  • Protocol versus token: 0x continues to document APIs that aggregate decentralized exchange liquidity. Activity in those products should not be treated as evidence that ZRX governance is active or that token holders receive protocol revenue.

History

  • 2016 — 0x conceptualized by Will Warren and Amir Bandeali as a shared open protocol for decentralized exchange on Ethereum.
  • August 2017 — ZRX token sale. 0x raises ~$24M in a public token sale. ZRX launches on Ethereum.
  • August 2017 — 0x Protocol v1 launches on Ethereum mainnet, introducing the off-chain relay / on-chain settlement model.
  • 2018 — 0x v2 ships, adding support for new token standards and multi-asset trades.
  • 2019 — 0x v3 introduces staking and protocol fee mechanics, tying ZRX holders more directly to protocol revenue.
  • 2020 — 0x API launches, aggregating liquidity from multiple DEXes and attracting major wallet integrations (MetaMask Swaps launches using 0x).
  • 2021 — Matcha DEX launches as 0x’s consumer product. 0x v4 (codename “NFT”) ships with support for NFT trading alongside ERC-20s.
  • 2022–2023 — Volume shifts to AMMs. Uniswap and Curve dominate retail DEX volume; 0x repositions as B2B infrastructure rather than competing directly in retail.
  • 2024 — 0x DAO activity increases, with community grants and protocol parameter votes. ZRX price remains subdued relative to ATH.

Common Misconceptions

“0x is a DEX.”

0x is a protocol and API layer — it provides the infrastructure other applications build on top of. Matcha is 0x’s own DEX product, but the protocol itself is more analogous to a settlement layer than a trading venue.

“ZRX is needed to trade on 0x.”

Users do not need to hold ZRX to trade through any 0x-powered application. ZRX is a governance token. Protocol fees are paid in ETH, not ZRX.

Criticisms

  • AMM competition: Uniswap’s fully on-chain AMM model proved simpler for users and captured the majority of retail DEX volume, leaving 0x’s order book model better suited for professional/institutional use than retail.
  • ZRX utility erosion: The staking/fee-share mechanics introduced in v3 were later simplified, reducing ZRX’s direct economic utility and weakening the bull case for holding the token.
  • Relayer chicken-and-egg problem: The off-chain order book model requires active relayers with liquidity. In practice this proved difficult to bootstrap, and most volume now flows through the aggregator API rather than relayer order books.
  • Token performance: ZRX peaked at ~$2.50 in early 2018 and has traded below $0.20 for most of 2023–2026, disappointing early investors despite continued protocol usage.

Social Media Sentiment

  • A March 2024 r/0xProject thread is a narrow user report about difficulty withdrawing staked ZRX; replies discuss a browser-specific workaround. It describes one support experience and does not establish general token sentiment or a current protocol-wide problem.

Last updated: 2026-10

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