Every ecosystem develops a vocabulary, and Arc inherits crypto's whole dictionary plus a few terms of its own. Forty definitions, two sentences or fewer each, plain language throughout — the Arc-specific terms first, then the DeFi and token-launch vocabulary you'll meet across this hub.
Arc & network terms
Arc — Circle's Layer-1 blockchain, built for stablecoin finance, where gas is paid in USDC. Public testnet since October 28, 2025; public mainnet from September 16, 2026 (the full explainer).
USDC — The dollar-backed stablecoin issued by Circle, and Arc's native asset. On Arc it plays the role ETH plays on Ethereum: paying gas and moving as native value.
Native USDC (18 decimals) — Protocol-level USDC on Arc, carrying 18 decimals rather than the 6 of ERC-20 USDC on other chains. The single biggest porting gotcha for developers (why).
Gas — The fee paid to execute a transaction. On Arc it's denominated in USDC, making costs dollar-predictable; testnet fees averaged around $0.004.
Malachite — Arc's consensus engine, responsible for the network's deterministic sub-second finality (~780ms).
Deterministic finality — Settlement that is immediately and permanently final, with no reorg window or confirmation counting. On Arc, "sent" means "settled" in under a second.
Proof-of-authority (PoA) — Consensus where a known, permissioned set of operators produces blocks; Arc's launch model, run by eleven named institutions (who they are).
Proof-of-stake (PoS) — Consensus where validators stake capital for the right to produce blocks. Arc's whitepaper describes a future PoA-to-PoS transition; it has not shipped.
Validator — An operator running the nodes that order transactions and commit blocks. Arc's founding validators include BlackRock, Visa, Mastercard, and DTCC.
EVM — The Ethereum Virtual Machine, the runtime executing smart contracts on Ethereum and compatible chains. Arc implements it, so Ethereum contracts and tools work unchanged.
Solidity — The dominant smart-contract programming language of the EVM world, fully usable on Arc.
Chain ID — The number uniquely identifying a network to wallets and tools. Arc testnet is 5042002; mainnet's published at launch.
RPC — The endpoint URL through which wallets and apps talk to a chain. A wrong or malicious RPC can show false state — take Arc's only from official sources.
Arcscan — Arc's block explorer, where every transaction, balance, and contract is publicly inspectable (how to use it).
Faucet — A service dispensing free test tokens; Circle's is at faucet.circle.com. Testnet-only — a "mainnet faucet" is always a scam.
Testnet — A rehearsal network with valueless tokens for testing and practice. Arc's runs alongside mainnet permanently.
Mainnet — The real network carrying real value. Arc's opened September 16, 2026.
CCTP — Circle's Cross-Chain Transfer Protocol, moving native USDC between chains without wrapped assets — the canonical way onto Arc (bridge guide).
Bridge — Any mechanism moving assets between chains. For USDC to Arc, CCTP is the native option.
Confidential transfers — Arc's opt-in privacy feature: transfer amounts are shielded while addresses remain visible, built for regulated finance.
View key — A credential letting a designated party (an auditor, a regulator) see the shielded details of confidential transfers. Privacy for the public, transparency for the accountable.
StableFX — Arc's onchain foreign-exchange engine for trading between stablecoins, with EURC and regional currencies (BRL, JPY, MXN signaled) planned.
EURC — Circle's euro-backed stablecoin, planned for Arc as StableFX expands beyond the dollar.
ARC token — An exploratory "coordination asset" described in Circle's May 2026 whitepaper; no token has launched and no airdrop is announced. Everything trading as "ARC" today is counterfeit (the full story).
Trading & DeFi terms
Airdrop — Free distribution of tokens to a set of wallets, used for marketing or community rewards. Also crypto's most-imitated scam format — verify every claim page.
AMM (automated market maker) — A DEX design where a formula prices trades against pooled liquidity rather than an order book. Uniswap and Aerodrome, both on Arc, are AMMs.
Bonding curve — A pricing function where a token's price moves along a preset curve as supply is bought or sold. The mechanism behind many launch mechanics and memecoin platforms.
DEX (decentralized exchange) — An exchange running as smart contracts, where users trade from their own wallets. Arc's day-one DEXes are Uniswap and Aerodrome.
Liquidity pool — The paired token reserves an AMM trades against — on Arc, typically your token plus USDC. Deeper pools mean gentler prices.
LP token — The receipt received for depositing into a liquidity pool, redeemable for the underlying reserves. Whoever holds it controls the liquidity — which is why locking it matters.
Position NFT — The non-fungible representation of a concentrated-liquidity position (as in Uniswap v3). Locks as a whole position rather than a divisible balance (how).
Slippage — The difference between quoted and executed price, bounded by your slippage tolerance setting (mechanics on Arc).
Price impact — The price movement your own trade causes by consuming pool depth. Visible in the quote before you sign.
MEV — Value extracted by controlling transaction ordering (sandwich attacks being the trader-facing form). Arc's live MEV landscape is unmeasured pre-mainnet; tight slippage is the standing defense.
Token-launch & safety terms
Liquidity lock — Depositing LP tokens into a time-locked contract so the pool can't be withdrawn before expiry — the strongest anti-rug signal a launch can send (how it works).
Vesting — Releasing allocated tokens gradually on a schedule, enforced by contract rather than promise.
Cliff — A vesting period during which nothing unlocks at all — typically 12 months for teams — before gradual release begins.
TGE (token generation event) — The moment a token is created and first becomes tradable; "unlocked at TGE" means liquid from day one.
Rug pull — A scam where insiders drain the liquidity or dump hidden supply, collapsing the price (how to spot one).
Honeypot — A token contract engineered so you can buy but not sell. Detectable: check for successful sells from ordinary wallets before buying.
FAQ
What's the most important Arc-specific term to understand? Native USDC with 18 decimals — it explains the gas model, the "ETH" label quirk, and the one real developer gotcha in one concept.
What does "view key" mean on Arc? It's the auditor's window into confidential transfers: amounts are shielded from the public but disclosable to designated parties — privacy without unaccountability.
Is there an official ARC token I should know? No — the whitepaper's coordination asset is exploratory and unlaunched. Any "ARC" you encounter trading is fake.
What's the difference between a liquidity lock and vesting? A lock immobilizes LP tokens (the pool); vesting schedules the release of allocated tokens (the supply). Serious launches use both.
Will this glossary grow? Yes — terms are added as the ecosystem coins them, with the last-verified stamp updated at each pass.
Fluent enough to launch? Put the vocabulary to work — mint, lock, and vest on Arc with Team Finance.Open Team Finance →Sources: docs.arc.network, arc.io, Circle pressroom (Arc-specific terms). Verified August 2026.
Last verified: August 2026