What backs the dollar on an on-chain venue

On a regulated exchange a dollar in your account is a dollar at a clearing house or a broker, held under rules a regulator wrote. On an on-chain venue the balance on your screen is a token, and the token is a promise from a company you have probably never dealt with, sitting in contracts that a second company administers, sometimes lent onward to a third. None of those parties is hidden. Each one writes down what it promises and what it reserves, and the documents are short enough to read before you deposit.

This page reads them in the order the money passes through them: the stablecoin issuer's terms, the question of whether the token in your wallet is the issuer's token at all, the venue's use of the collateral while you wait, and the admin roles and audits around the contracts. It describes what each document says. It does not rate a token or a venue, and nothing here is a statement that any of them is sound or unsound.

How it works

The issuer: a promise to its customers, not to you

Tether. Tether's Token Terms of Sale and Service, last updated on 26 February 2026, say that "In order to cause Tether Tokens to be issued or redeemed by Tether, you must be a verified customer of Tether", and that the right to purchase or redeem "is a contractual right personal to you". Tether's fee page sets the threshold for becoming one: a minimum acquisition or redemption of 100,000 dollars, a redemption fee of the greater of 1,000 dollars or 0.1%, and a non-refundable verification fee of 150 dollars in Tether tokens. The same terms reserve the right to bar transactions with US persons other than eligible contract participants Tether agrees to.

On what stands behind the token, the terms say each token in circulation "is 100% backed by an amount of assets ('Reserves') equal to the stated value", that the reserves "are comprised of cash, cash equivalents and other assets and may include loan receivables and other assets from Affiliates", and that the tokens are not legal tender and "are not subject to Federal Deposit Insurance Corporation or Securities Investor Protection Corporation protections".

Circle. Circle's USDC Terms, last updated on 15 October 2026, divide holders in two. A holder with a Circle Mint account can mint and redeem. A holder without one "may not redeem USDC with Circle unless and until you open a Circle Mint account", and the terms add: "Users Type B are not customers of Circle". Circle says the reserves are held "with U.S. regulated financial institutions in segregated accounts apart from Circle's corporate funds", that it may hold them in interest-bearing instruments, and that "you are not entitled to any interest or other returns earned on such funds". USDC "is not subject to deposit insurance protection".

So the redemption at one dollar that both issuers describe is a redemption for their account holders. A trader who deposited a stablecoin on a prediction market and wants dollars back typically gets them by selling the token to somebody else, an exchange or a buyer on a pool, at the price that somebody offers. Circle's terms say as much: it "cannot control how third parties quote or value USDC".

Both issuers can freeze

Tether's terms list, among the sanctions for a prohibited use, "freezing or confiscation of any ... Tether Tokens" and "blacklisting any Digital Tokens Address which holds Tether Tokens". Circle's terms reserve the right to "block" USDC addresses and say that "Circle reserves the right to block the transfer of USDC to and from an address on chain as permitted under the blocklisting policy". A token's issuer can therefore stop a balance moving whether or not the venue holding it agrees.

Is the token in your wallet the issuer's token at all?

Both issuers draw the line at their own contracts. Tether's terms: a third party may create a token "which claims to be an alternative version of Tether Tokens, such as by 'wrapping' or 'bridging' Tether Tokens. These Digital Tokens are not Tether Tokens," they "cannot be redeemed with Tether", and Tether accepts no liability for them. Circle's: it "supports only USDC and is under no obligation to support any copies of USDC or wrappers".

Which contract is the issuer's is a published fact. Tether's supported-protocols page, read on 23 October 2026, gives a USD₮ contract address for Ethereum, Avalanche, Celo, Kava and other chains. It lists BNB Smart Chain too, and the only contract address it gives there is for XAU₮, its gold token. A venue's documentation that says "USDT on BNB Chain" therefore does not by itself tell you that the token is one Tether's page lists; the contract address does, and the issuer's list is where to check it.

Some venues add a layer of their own. The Polymarket card records its collateral as pUSD, an ERC-20 backed by USDC that is wrapped and unwrapped through Polymarket's own contracts. On Circle's terms that is a wrapper, which Circle has no obligation to support; what gets you from pUSD back to USDC is Polymarket's contracts and the pool behind them, set out step by step on how money gets out.

The venue: where the collateral goes while you wait

What your money does while you wait notes that on a non-custodial venue nobody usually earns a rate on locked collateral. Predict.fun, on BNB Chain, is the exception and says so. Its Yields page, last updated on 29 January 2026, says "all USDT collateral is routed to earn interest" in the USDT pool of Venus Protocol, which it calls a decentralized money market, with yield distributed weekly from on-chain snapshots of open positions, "no fixed rate", and "a management fee of 10% on yield generated".

The same page carries the cost in its disclaimer. If the Venus pool's utilisation crosses a threshold there is "little to no floating liquidity", and "users with open positions on yield-bearing markets may be unable to claim winnings for a short period of time". The page says crunches have historically resolved within a day, and that Predict.fun has the right to withdraw from Venus while some liquidity remains.

Cyfrin's audit of those contracts, dated 18 February 2026 for work done between 21 and 27 January, is specific about the tight case. Its one medium-severity finding is that the emergency function meant to switch Venus off during high utilisation itself tries to withdraw from Venus, and so "is unusable during the exact emergency it was designed to handle". The report records the finding as acknowledged, with Predict.fun's reply that the design change "is quite huge and probably not justifiable for a redeploy". A low-severity finding, also acknowledged, concerns yield calculations if the value of Venus's tokens ever falls, "due to bad debt, exploits, or other losses in Venus protocol". Whether a later deployment changed either is not in the documents read for this page.

The admin keys, and what an audit does and does not cover

A venue's contracts usually have administrators. The February audit describes a top admin role that "controls transfer whitelisting and can gate split and merge operations", and a yield-manager role that "manages Venus integration, including connecting vTokens, claiming yield, and enabling or disabling the yield mechanism". The April audit, of Predict.fun's price-market contracts, names the multisig that holds the top admin role on BNB Smart Chain, notes that the deployment script left the deployer's own address holding the same role, records the team's confirmation that a later multisig transaction revokes it, and recommends verifying that on chain. What the admin role can do to a price round is on what a crypto price contract settles on.

An audit is a reading of named files on named days. Both Cyfrin reports carry the same disclaimer: "A security audit by the team does not endorse the underlying business or product. The audit was time-boxed and the review of the code was solely on the security aspects of the in-scope code being audited." The February scope lists five files, three yield-bearing contracts and two conditional-token ones; the April scope lists three Solidity contracts and five workflow files. Code outside those lists, and code deployed after the reviewed commit, is outside what the report says.

What it costs

• Redeeming with Tether: a 150 dollar verification fee, a 100,000 dollar minimum, and the greater of 1,000 dollars or 0.1% per redemption, from its fee page.
• Redeeming with Circle: one dollar per USDC "less fees where applicable", for Mint account holders. The terms say Circle charges nothing for minting or receiving USDC in a Mint account except as its fee schedule discloses, and does charge for sending USDC on chain out of it.
• Yield on Predict.fun: 10% of the yield generated, taken by Predict.fun; the rate itself floats with the Venus pool.
• Everything else is a spread: what a buyer pays for your token, and what a pool charges to swap a wrapper back. How money gets out works through those for the venues in this catalogue.

What you can do about it

Check the contract address of the collateral against the issuer's list. The token's name is not evidence. If the venue's token is not on the issuer's page, it is a copy, a wrapper or a bridged token, and its value back in dollars depends on whoever issued that.

Know how you would turn it into dollars. Unless you hold a Mint account with Circle or a verified account with Tether, your exit is a sale to a third party. Find out which one before you need it, and what it charges.

Read the venue's yield page before the market page. If the venue lends collateral out, the page says where, at what fee, and what happens to claims when the pool is short. On Predict.fun the answer to the last question is a delay, in the venue's own words.

Read an audit's scope and status table, not its summary. The scope says which files were read; the status table says which findings were fixed and which were acknowledged and left. An audit of one integration says nothing about the next.

Find out who holds the admin roles. The audit names the addresses; the current holders are on-chain state. A multisig is several keys rather than one, and it is still somebody's.

Keep the venue balance to what your positions need. Every party above applies to a balance that sits there between trades. Where your own keys sit in all this is on where your key lives; the venues themselves, with their collateral and custody, are in the prediction market venues listing.