Stablecoin issuers are the entities that mint, redeem, and back the dollar-pegged tokens used onchain. The five largest by market cap and onchain activity are Circle (USDC), Tether (USDT), Paxos (USDP, PYUSD), Sky (formerly MakerDAO; DAI and USDS), and Ethena (USDe). Each runs a different reserve model, regulatory posture, and attestation cadence, and those differences determine where the token can be held, how fast it can be redeemed, and what risks sit behind the peg. This comparison covers the five issuers side by side: who they are, how the dollar-equivalent is backed, who audits or attests, which chains they're live on, and which use cases each model fits.
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Stablecoin supply crossed $235B in early 2026 across all issuers, with USDT and USDC together accounting for roughly 85% of that float. The remaining 15% is split between regulated single-purpose tokens (USDP, PYUSD, RLUSD), crypto-collateralized DAI/USDS, and the synthetic-dollar category Ethena pioneered. Choosing between issuers is no longer a question of liquidity alone — it's a question of reserve transparency, regulatory permission, and whether the issuer can settle redemptions on the chain you actually use.
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A stablecoin issuer is the legal entity (or, in the case of Sky, the protocol governance system) responsible for maintaining the peg between a token and its reference asset. The job has three parts: (1) accept dollars or collateral and mint the token, (2) hold reserves that back outstanding supply, and (3) burn tokens on redemption and return dollars or collateral. How an issuer performs each step — what it accepts as input, where reserves sit, who can redeem, and on what timeline — defines the token's risk profile.
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Two structural models dominate. Fiat-backed issuers (Circle, Tether, Paxos) hold cash and short-duration Treasuries in regulated bank or broker accounts and mint 1:1 against dollar deposits. Crypto-collateralized issuers (Sky's DAI/USDS, Ethena's USDe) hold onchain collateral — ETH, staked ETH, real-world-asset vaults, or perpetual-futures hedges — and mint against overcollateralized positions. The U.S. Treasury's 2025 TBAC presentation on stablecoin demand drivers separated these models explicitly because they affect Treasury market plumbing differently: fiat-backed issuers buy bills directly, while crypto-collateralized issuers do not.
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For fiat-backed tokens, the flow is: an institutional client wires USD to the issuer, the issuer deposits that USD with its custody bank, and the issuer mints an equivalent amount of the token to the client's onchain wallet. Redemption reverses the flow: the client sends the token back, the issuer burns it, and a wire returns the USD. Circle publishes the API for this flow; Tether handles it through its onboarded counterparty list; Paxos runs a similar institutional desk for PYUSD and USDP.
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For crypto-collateralized issuers, the flow happens onchain. To mint DAI/USDS, a user locks collateral — ETH, USDC, real-world-asset vault tokens — into a Sky vault and the protocol mints stablecoin against it at a configured collateral ratio. Liquidation is automatic if collateral value drops below threshold. To mint USDe, Ethena accepts staked ETH and simultaneously opens a short perpetual-futures position to hedge the directional exposure, leaving only the funding rate as the yield-and-risk driver. The token is "delta-neutral" not because reserves equal liabilities in dollars, but because the long-spot plus short-perp position is engineered to hold dollar value when ETH moves.
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The retail-facing implication: holders of fiat-backed tokens depend on the issuer's banking relationships and reserve management; holders of crypto-collateralized tokens depend on protocol code, oracle integrity, and (for USDe) perpetual-futures venue solvency.
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The table below summarizes the five at the time of writing (early 2026). Numbers come from DeFiLlama's stablecoins dashboard, issuer transparency reports, and SEC filings where available.

Circle Internet Financial is a NY-domiciled fintech regulated under the New York DFS BitLicense and registered as a Money Services Business with FinCEN. USDC reserves are held in cash at GSIB banks plus the Circle Reserve Fund, a registered 2a-7 government money market fund managed by BlackRock and held at BNY Mellon. Circle publishes monthly attestations from Deloitte and a real-time CUSIP-level reserve breakdown. Circle is also one of Eco's primary partner rails — the digital dollars infrastructure piece covers Circle's role in B2B payments in detail.
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Tether Holdings Limited is registered in the British Virgin Islands and operates principally out of El Salvador. USDT is the largest stablecoin by supply, with reserves spanning U.S. Treasuries, cash and cash equivalents, secured loans, gold (XAUT correlation), and Bitcoin. Tether publishes quarterly attestations from BDO rather than full audits. The 2021 CFTC settlement (USD 41M) over historical reserve disclosure is part of Tether's record; current attestations report ~80%+ of reserves in cash and Treasuries.
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Paxos Trust Company is a NYDFS-chartered trust company — a banking-grade regulator chartering it to hold customer assets in segregated accounts under New York banking law. Paxos issues its own USDP and white-labels PayPal USD (PYUSD) and several other regulated stablecoins. Reserves are held 1:1 in cash at FDIC-insured banks and short Treasuries; Withum publishes monthly attestations. Paxos partners with Eco for PYUSD orchestration across chains.
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Sky is the rebranded MakerDAO ecosystem after the 2024 Endgame plan. DAI, the original crypto-collateralized stablecoin since 2017, remains live; USDS is the new flagship designed for institutional adoption with optional KYC features. Reserves are a mix of onchain ETH/staked-ETH vaults, a USDC peg-stability module that swaps DAI 1:1 with USDC at parity, and tokenized real-world assets including U.S. Treasuries via BlockTower and Monetalis. Governance is conducted through MKR (now SKY) token voting; the protocol has no corporate parent. The deeper MakerDAO/DAI explainer covers governance and Endgame in detail.
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Ethena Labs is a BVI-registered protocol developer that launched USDe in February 2024. The collateral model is delta-neutral: each USDe is backed by one staked-ETH token plus a short ETH-perpetual position of equivalent notional, so price moves in the spot collateral are offset by the futures hedge. Yield is paid as sUSDe (the staked, yield-bearing version) and comes from staking rewards plus perpetual funding rates. The mechanism is documented in Ethena's whitepaper; the live dashboard shows real-time collateral, hedge venues, and reserve fund.
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"Audit" and "attestation" are different. A full audit is a year-end opinion under GAAS or PCAOB standards; an attestation is a point-in-time agreed-upon-procedures report on a specific assertion (e.g., "at 5 p.m. on March 31, reserves matched supply"). Stablecoin issuers publish attestations because monthly audits are operationally infeasible and because an attestation on reserves is the customer-relevant question.
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Circle and Paxos publish monthly attestations and have done so consistently for years. Tether moved from quarterly to monthly attestations in 2021 and now reports through BDO. Sky's collateral is observable onchain in real time via Etherscan and DeFiLlama — there's no attestor because there's no off-chain reserve to attest to. Ethena publishes a live dashboard with venue-by-venue collateral and hedge positions, plus quarterly attestations from Chaos Labs on the reserve fund and Harris & Trotter on the broader collateral set.
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The MiCA regulation that took effect across the EU in 2024 requires e-money token issuers to hold 1:1 reserves at credit institutions and publish quarterly attestations; Circle's EURC and USDC EU operations comply, while Tether has not pursued MiCA registration and its tokens have been delisted from MiCA-regulated EU exchanges as a result. ESMA's final MiCA RTS report is the primary source on what attestation cadence and reserve composition the rules require.
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Regulatory posture varies more across these five than any other dimension.

The proposed U.S. GENIUS Act would require federal or state-licensed issuance for any payment stablecoin used in U.S. commerce. If enacted, Circle and Paxos are positioned to comply directly; Tether and Sky/Ethena would face structural changes to serve U.S. customers.
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The right issuer depends on the use case.

Eco is the stablecoin orchestration network that moves these issuer-specific tokens across chains. A treasury team holding USDC on Base, PYUSD on Solana, USDT on TRON, and USDS on Ethereum integrates Eco once and gets unified routing, 1:1 swaps, and settlement across all 15 supported chains. Circle and Paxos are partner rails; the network also routes against Tether, Sky, and Ethena tokens where liquidity exists. The orchestration layer is issuer-agnostic by design — teams choose the issuer that fits their compliance and use case, and Eco handles the cross-chain plumbing.
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Paxos holds a NYDFS Trust Charter, which is the highest-tier U.S. banking regulator structure for a stablecoin issuer. Circle holds a NY DFS BitLicense and operates as a regulated EMI under MiCA in the EU. Both file regular reserve attestations and operate inside U.S. and EU regulatory perimeters; stablecoin compliance tools covers the supporting infrastructure.
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Tether publishes quarterly attestations from BDO, which is a point-in-time agreed-upon-procedures report rather than a full GAAS audit. Reserves include U.S. Treasuries, cash, secured loans, gold, and Bitcoin. The CFTC's 2021 settlement addressed historical disclosure issues; current attestations report ~80%+ in cash and Treasuries.
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DAI is the original MakerDAO stablecoin from 2017, fully decentralized and crypto-collateralized. USDS is Sky's 2024 flagship, designed for institutional integration with optional KYC features and additional reserve composition. Both run inside Sky's governance, and DAI can be converted to USDS 1:1 through the protocol.
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USDe is a synthetic dollar, not a fiat-backed stablecoin. It maintains its peg through a delta-neutral position — staked ETH collateral plus a short ETH-perpetual hedge — rather than holding cash reserves. It functions like a stablecoin for onchain use and pays yield through sUSDe, but the reserve model and risk profile differ materially from USDC or USDT.
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Circle's USDC is live on 20+ chains via native issuance plus CCTP cross-chain transfer. Tether's USDT is live on 14+ chains, with TRON, Ethereum, and Solana carrying the bulk of supply. Paxos issues PYUSD on Ethereum and Solana, and USDP on a smaller set. Sky's DAI/USDS run on Ethereum plus most major L2s.
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