Choosing a stablecoin liquidity provider: issuer, exchange, OTC desk or bank, and what goes in the agreement

A stablecoin liquidity provider is the counterparty that takes your fiat and delivers USDC or USDT, or takes your stablecoins and delivers fiat, at an agreed price and time. For an institution running settlement on stablecoin rails it is the most important vendor decision after custody, because the conversion leg is where price, counterparty and timing risk concentrate. Choose by comparing the four provider types on who holds your funds, how price is formed and how settlement is timed, then run due diligence against documents, set concentration limits and write the operating rules into the agreement. This article walks through the provider types, the due diligence questions, the pricing structures, settlement timing, limits and the contract terms.

What are the four types of liquidity provider and how do they differ?

Issuer direct means an account with the stablecoin issuer itself. You wire dollars to the issuer's bank account and it mints tokens to your wallet at par; you send tokens back and it redeems at par to your bank account. The price is fixed by construction, the counterparty is the issuer, and the constraint is eligibility, since issuers onboard institutions rather than everyone, and bank wire cut-offs. Under the GENIUS Act, permitted payment stablecoin issuers must honour redemption and publish reserve composition, which makes the issuer-direct route the cleanest from a counterparty perspective.

An exchange offers a fiat on-ramp and an order book. You deposit fiat into the exchange's account, buy the stablecoin on the book and withdraw to your wallet. Price is the market price plus fees, liquidity is deep for major pairs, but your funds sit on the exchange's balance sheet between deposit and withdrawal and you are an unsecured creditor for that interval. An OTC desk quotes you a firm price for a block, settles bilaterally, and takes the market risk between quote and fill. It suits size and currencies where the book is thin, and its pricing is a spread to the reference. A bank partner, where available, offers conversion as a banking product, often by routing to an issuer or desk behind the scenes, and gives you settlement in your own bank account with the bank as counterparty.

The decision rule most treasuries arrive at is layered: issuer direct for the base volume in the main stablecoin, an OTC desk for size and for non-dollar currencies, an exchange as a secondary source, and a bank partner where the institution's own banking relationship can provide it. The operating wallet that receives minted tokens is a till, not a vault; it is sized to the day's conversion and swept.

Which due diligence questions actually discriminate between providers?

The due diligence file should be built from documents that can be checked, not from answers on a questionnaire. Ask for each of the following and record what you received.

• Regulatory status in each jurisdiction where the provider serves you, evidenced by licence certificates or register entries, for example an MSB registration and state licences in the US, MiCA authorisation in the EU or FINTRAC registration in Canada.
• The bank or banks through which fiat settles, with confirmation that client funds are segregated, and the provider's policy if that bank withdraws service at short notice.
• How client stablecoins are held during a trade, whether in segregated wallets, in an omnibus wallet or with a third-party custodian, and who controls the keys.
• For issuers, the latest reserve attestation and the redemption terms; for non-issuers, which stablecoins they support and the issuer accounts they hold, since a desk that cannot redeem directly is passing on someone else's counterparty risk.
• Operational resilience evidence, including the incident history for the past two years, the cut-off calendar, the support model outside your business hours and the last penetration test summary.
• The financial statements, ownership and control persons, and the beneficial ownership information you would collect from any institutional customer under your own KYB.

The question that discriminates most is the second one. A provider whose banking is concentrated in one institution, or whose banking it will not disclose, presents a settlement failure risk that no pricing advantage compensates for. The document that closes the question is a bank reference or a comfort letter, not a statement on the website.

How is stablecoin conversion priced, and what should you see on each fill?

The reference price is par at the issuer. Every other structure is a spread to that. Exchanges quote the book price plus a taker or maker fee and a withdrawal fee; the effective rate depends on order size and on the depth of the book at the moment of execution. OTC desks quote an all-in price, and the spread embedded in it depends on size, direction, currency pair, time of day and how urgently you need the fill. Bank partners tend to quote a fixed spread to a reference rate, sometimes with a monthly minimum.

What you should require from any provider is the ability to reconstruct the price. For each fill you want the reference rate used, the spread or fee applied, the quantity, the timestamp of quote and of execution, and the identifier that links the fill to the on-chain transaction or the fiat wire. That is the evidence a customer, an auditor or a regulator asks for when questioning a rate. A provider that reports only a blended all-in number makes your own rate evidence weaker. For non-dollar fiat there is a second leg, the FX conversion into dollars or the dollar stablecoin into local currency, and the fill report must show the two rates separately rather than one blended figure.

Volume tiering is normal. Agree the tiers in writing, agree how volume is measured, and ask for a monthly statement that shows the tier applied. Treasuries that benchmark providers against each other do so on the effective spread to par per corridor, per month, and use that table in the annual renegotiation.

Price is the easiest thing to compare and the least important thing to get wrong. The provider that is a few basis points cheaper and cannot settle on a Friday afternoon costs more than the one that can.

When does settlement actually happen, and who bears the gap?

Settlement timing is the point at which most provider relationships fail in practice. The stablecoin leg settles in minutes on chain. The fiat leg settles when the wire, ACH, SEPA or EFT credit arrives, which depends on the banking cut-off calendar, holidays in the currency's home country and whether the provider's bank offers instant or same-day rails. Between the two legs one side is exposed. If you send fiat first, the provider holds your money until it delivers tokens; if you send tokens first, you hold the provider's credit until fiat arrives.

Write down, per provider and per direction, the following: the quote validity window, the deadline by which each leg must settle, the cut-off after which a trade rolls to the next business day, and the treatment when one leg settles and the other does not. The strongest position is payment versus payment, where the provider releases tokens against confirmed fiat credit or a settlement platform locks both legs, but where that is not available the fallback is a pre-agreed exposure limit per provider and per day. Issuer-direct settlement typically follows the issuer's bank cut-offs; an OTC desk may offer T+0 within a window and T+1 outside it; an exchange settles the token leg immediately once the fiat deposit is credited, which is the slow part. Ask for the provider's calendar for the year and load it into your own treasury system, so that a request to convert on a holiday in the provider's bank jurisdiction is rejected at entry rather than discovered at cut-off.

How should concentration limits be set across providers, chains and assets?

Concentration limits are the practical answer to counterparty risk. Set a maximum open exposure per provider, defined as the value of fiat sent but tokens not yet received plus tokens sent but fiat not yet received, and enforce it at trade entry. Set a maximum share of monthly conversion volume per provider, so that no single suspension stops settlement, and hold at least two live providers for each corridor with a tested switch. Set a maximum holding per stablecoin and per chain, because an issuer incident or a chain outage affects everything on that asset or that network at once.

The limits should be owned by the risk function, reviewed quarterly and breached only with a recorded approval. The report a board or a bank partner asks for is a table of open exposure by provider at end of day, against limit, for the past month. Providers should know they are one of several; that knowledge improves both pricing and behaviour at cut-off.

What must the agreement contain?

The agreement turns the operating design into enforceable terms. Beyond the standard commercial provisions it should fix quote validity and the mechanism for a firm quote, settlement deadlines per leg and per direction with the consequence of a miss, the cut-off calendar and how changes to it are notified, failed-trade treatment including who bears the market move and the fee on a return, the exact data delivered per fill and the format, monthly statements with tier and volume, the wallet addresses of record on both sides and the change procedure for them, the provider's obligations on sanctions screening and Travel Rule data for the token legs, segregation of client funds and assets, notice periods for suspension of a corridor or an asset, and the audit and information rights your own examiner expects you to hold over a material vendor.

One clause is frequently missed: the address change procedure. A provider that accepts an emailed request to change the destination wallet is a fraud vector. The agreement should require a signed change on a control form, an out-of-band confirmation, a test transfer and a cooling period before the new address is used for size. The same applies in reverse to your own instructions to the provider.

Where StableNet fits

StableNet, built by SpendTheBits, is a cross border B2B payment and settlement platform for banks, credit unions, licensed money service businesses, exchange houses and remittance fintechs. It sits on the settlement side of the liquidity relationship described here: the fiat-to-crypto on-ramp and crypto-to-fiat off-ramp flows connect an institution's chosen liquidity providers to its settlement in regulated stablecoins such as USDC and USDT on public blockchains, with customers keeping custody of the tokens throughout. Every conversion leg is tied to an ISO 20022 instruction, a pacs.008 or pacs.009 inside a head.001 envelope tracked by UETR, and to the on-chain transaction hash, so the fill evidence a provider supplies can be reconciled to the message and to the chain in the tamper evident audit trail. KYB onboarding, wallet screening and KYT apply to provider wallets, and the compliance workbench records the approval of each address of record. SpendTheBits is a Bank of Canada registered payment service provider and a named finalist in the Swift Hackathon 2026 Technical Challenge.