Institutional Stablecoin Settlement: How It Works

What is stablecoin settlement?

A stablecoin is a token designed to hold a steady value against a reference asset, usually a national currency. Stablecoin settlement uses that token as the payment leg or the asset leg of a trade. Instead of wiring dollars through a bank and waiting for the wire to land, the buyer or seller transfers a stablecoin on a blockchain. The CPMI and IOSCO have published guidance on applying the Principles for Financial Market Infrastructures to stablecoin arrangements.

Two things make it attractive to institutions: the transfer can happen outside banking hours, and the record is shared and timestamped. Two things make it risky: the stablecoin has its own issuer and reserve risk, and a blockchain transfer cannot be reversed once it is confirmed. The BIS assesses stablecoins in chapter III of its 2025 Annual Economic Report.

See the stablecoin glossary entry for the short definition.

How an institutional stablecoin trade settles

A typical flow has six steps:

1. Quote. The buyer asks one or more dealers for a price using a request for quote. See RFQ.
2. Execution. The buyer accepts a quote, and the trade is booked at the agreed price.
3. Transfer. The stablecoin and the other leg move between the parties, directly or through custodians.
4. Confirmation. Each side confirms the transfer is complete on the chain and in its own records.
5. Custody. The received asset is held by the buyer's custodian or in the platform's custody arrangement.
6. Reconciliation. The platform ledger, the custodian and the chain are matched, and any break is investigated.

Where the stablecoin is traded against another asset, delivery versus payment keeps both legs tied together: one moves only if the other does. See delivery versus payment and atomic settlement.

Mercury RWA materials describe a settlement path with Mercury Ledger position keeping, BitGo custody integration with KYC verification, and delivery-versus-payment execution, together with automated reconciliation across fiat and digital holdings.

When one leg is fiat, the conversion runs through a ramp. See fiat on- and off-ramps for brokers and desks.

Stablecoin RFQ and OTC trading

Large stablecoin orders are usually quoted rather than sent to a public order book, because a large order can move the price against the buyer and a quoted price gives the buyer certainty. A request for quote asks a dealer for one firm price on demand. A request for stream asks for a continuously updating price. Both are ways to price an order without exposing it on a lit book.

For the OTC workflow itself, see OTC trading in crypto. Mercury OTC supports around-the-clock RFQ, RFS and streaming quotes, with single-dealer, multi-dealer or hybrid pricing and client deposit and withdrawal tools. Settlement timing depends on the asset and payment rail.

Liquid Mercury, the Chicago-based institutional digital asset infrastructure provider, built Mercury OTC to replace voice-and-chat trading with an electronic desk. One documented example is K33, a crypto broker regulated by the Norwegian Financial Supervisory Authority. K33 used Mercury OTC to automate its RFQ desk across 200 trading pairs and 8 fiat currencies, and its OTC trading volume grew 5x. That case study is about desk automation across pairs and currencies, not stablecoins specifically. See the live K33 case study.

When comparing platforms for stablecoin RFQ, ask:

• which stablecoins and pairs are quoted
• how many dealers can quote and how prices are streamed or locked
• how settlement works and in what currency
• which regions and accounts are blocked
• how reconciliation and reporting are produced

Risks

• Issuer and reserve risk. A stablecoin is only as sound as its issuer and the reserves behind it. Read the issuer's reserve disclosures. The Federal Reserve Board has published research on primary and secondary markets for stablecoins.
• Depeg risk. A stablecoin can trade below its reference value, and large orders can be hit hardest at that moment. New York Fed staff examine run dynamics in Runs and Flights to Safety: Are Stablecoins the New Money Market Funds?.
• Custody risk. Keys, custodian failure and operational errors can all lose funds.
• Regional availability. Confirm eligibility against issuer terms, account restrictions, applicable law and deployment configuration. For example, Tether's terms contain US-person restrictions and exceptions. Do not infer a universal rule for every platform or customer from an illustrative configuration.
• Regulatory status. The treatment of stablecoins differs by jurisdiction and changes over time. Check the current rules for each region you trade from. In the EU, MiCA's rules for e-money tokens and asset-referenced tokens are summarised on the EBA MiCA page.
• Finality. A confirmed on-chain transfer cannot be recalled. Checks must happen before sending.

Stablecoins as collateral

When an institution posts a stablecoin as collateral, the lender or prime broker takes on exposure to the issuer and to the stablecoin's price. The questions are the same as for any collateral: how it is valued, what haircut applies, who holds it and what happens in a depeg.

Collateral and financing sit in the prime brokerage relationship. See crypto prime brokerage for how those arrangements are structured.

Tokenized money market fund shares are also used as collateral. See tokenized money market funds.

How Liquid Mercury supports stablecoin flows

This section is limited to what the product materials state.

• Multi-asset support. Mercury Pro describes multi-asset trading for "tokenized securities, funds, real assets, digital assets, and stablecoins."
• Region restrictions. The risk engine can restrict assets by an account's region at the pre-trade stage.
• Multi-currency settlement. Mercury RWA materials describe support for major global currencies such as USD, EUR and GBP, with automated reconciliation across fiat and digital holdings. Mercury OTC materials list multi-currency settlement and custody integration as part of the platform.
• RFQ and streaming. Mercury OTC supports request for quote, request for stream and streaming quotes.

Ask any platform which stablecoins and chains it supports.