Every source answers differently on what the stablecoin market is worth. On 5 September 2026, CoinGecko reported $291.32bn, rwa.xyz $304.77bn and CoinMarketCap $314.72bn: a $23bn spread in one afternoon. Single assets diverge too. rwa.xyz put USDT at $193.05bn, where the other two put it near $183.4bn. USDC is steadier, $74.59bn to $74.60bn across the two, with Circle's own figure at $74.3bn as at 3 September.

That is not a scandal, it is a boundary problem. "The stablecoin market" is a decision about which tokens count, not a measurement. For a treasury or an allocation committee, the signal is that this subject is reported imprecisely in ways that matter once money moves.

The Paris 2026 programme carried twelve sessions tagged to the stablecoins track. Ten had named speakers and so have a session page each; the other two, a Day 1 side event and a closed roundtable, do not. Every role below is the one billed on the June 2026 programme, and every session is past.

Three instruments, routinely reported as one

One session put the problem in its title. "The New Architecture of Digital Cash: Stablecoins, Tokenised Deposits and Money Market Funds" ran on the Hecto Main Stage on Wednesday 3 June 2026, 15:50 to 16:25, with Emma Landriault, billed as JPM Coin Global Executive Director at JP Morgan, David Cunningham of Consensys and Tero Reuna of Paxos. Ben Schiller moderated.

A payment stablecoin, in the US statutory definition, is a digital asset designed for payment or settlement whose issuer must convert it for a fixed amount of monetary value. The Bank for International Settlements is blunter: a bearer-like instrument with no enforced par redemption between versions. In an August 2026 speech, BIS General Manager Pablo Hernández de Cos said recent evidence suggests most stablecoin balances are held in self-custodied wallets.

A tokenised deposit is not that. The same speech calls it an account-based bank liability on a programmable platform: a payment debits the payer, credits the payee, and settles between banks in central bank money. Rodney Garratt and Hyun Song Shin drew that line in BIS Bulletin 73, April 2023. The BIS Annual Economic Report 2025 supplies the sentence worth keeping: on that model, "no new credit exposures are created across institutions".

A tokenised money market fund is a third thing. The ECB's Macroprudential Bulletin of April 2026 defines it as a money market fund whose shares are issued and recorded as digital tokens on a distributed ledger: a claim on the fund, not on an issuer's reserve pool. The ECB put the global market at roughly EUR 7bn at end-2025, EU-domiciled funds at about EUR 725m, against roughly $300bn of stablecoins now. Different months and currencies, so no clean ratio, but the gap is more than an order of magnitude.

What separates the three legally is yield, and most coverage misses it. The GENIUS Act states that no permitted payment stablecoin issuer "shall pay the holder of any payment stablecoin any form of interest or yield", and MiCA takes the same line, barring issuers of e-money tokens and the providers dealing in them from granting interest to holders. A payment stablecoin is prohibited by construction from being a cash-management product. A tokenised money market fund distributes its return, is redeemed with the manager rather than sold on a secondary market, and sits under the Money Market Fund Regulation. Different products, different regulators, and treating them as interchangeable misprices something.

What it is for, once yield is settled

If a payment stablecoin cannot pay you, the treasury case is about moving money rather than holding it. Day 1 took that on in "21st Century Cash Optimisation: Embedding Digitally Native Money Market Funds Directly into OnChain Transactions", a Hecto Main Stage fireside on Tuesday 2 June 2026 with Jenny Johnson, billed as CEO of Franklin Templeton, and Caroline D. Pham, billed as CEO of MoonPay Institutional. The title is the thesis: do not park cash in a non-yielding token, embed the yield-bearing instrument in the transaction and shorten the interval in which cash sits idle.

The BIS view is an argument, not a definition, and it comes from an institution that prefers tokenised deposits. Stablecoins, it holds, fail three tests of sound money: singleness, because they "often trade at varying exchange rates"; elasticity, because new supply requires full upfront payment; and integrity, because bearer instruments cross borders with weak identification. Not every supervisor accepts it: the Bank of England has since drafted rules that assume sterling stablecoins can be made to work.

Reserves, attestation and audit

Circle's transparency page, dated 3 September 2026, puts most of the USDC reserve in the Circle Reserve Fund, a government money market fund under Rule 2a-7 of the Investment Company Act of 1940, managed by BlackRock. At 31 March 2026 the fund held about $66.5bn of a $77.1bn reserve in short Treasuries, overnight Treasury repo and cash; the rest sat as cash at regulated financial institutions.

Write-ups as recent as June 2026 still call Circle's monthly report agreed-upon procedures. The primary document says otherwise. It is headed "INDEPENDENT ACCOUNTANTS' REPORT", reads "We have examined management of Circle Internet Group, Inc.'s ... assertion that the Fair Value of Assets Held in USDC Reserve is equal to or greater than USDC in Circulation", was conducted under AICPA attestation standards requiring "reasonable assurance", and gives an opinion. That is an examination, materially stronger than agreed-upon procedures, under which the accountant concludes nothing.

The real limitation is in the same document: it covers two instants, 11 March and 31 March 2026, each at 11:59pm Coordinated Universal Time, and asserts nothing about any other moment. A June 2026 analysis by Spark lists what monthly attestation therefore does not establish: continuous backing, counterparty risk inside the reserve, related-party transactions, operational controls, going concern.

Tether moved further in 2026, so anything written before mid-August is stale. Its Q2 attestation, prepared by BDO and published 31 July 2026, reported assets of $187.75bn against liabilities of $183.64bn at 30 June 2026, excess reserves of $4.11bn and more than 146 tonnes of gold. Tether called it an attestation, not an audit. Then on 13 August 2026 Tether announced an unqualified KPMG opinion on a full financial statement audit. The scope matters: it covered Tether International, S.A. de C.V.'s statements for the year ended 31 December 2025 under US GAAP, with reserves exceeding token liabilities by $6.814bn at that date. That is an audit of a completed year, not a standing guarantee of backing today, and it does not by itself settle compliance with US stablecoin law.

The credit dimension, which is where the programme went

The session that travelled furthest from payments was "Where Stablecoins Meet Credit: Rewiring Finance Through Tokenisation", Hecto Main Stage, Wednesday 3 June, 12:25 to 13:00, with Anthony Bassili, billed as President of Coinbase Asset Management, Chris Cox, Head of Investor Services at Citi, Francesco Filia, CEO of Fasanara, and Maha Al-Saadi, listed as independent. Michael del Castillo moderated.

The reason it had anywhere to go is structural: a fully reserved payment stablecoin creates no credit. The GENIUS Act requires reserves on an at least one-to-one basis from a defined list: insured demand deposits, Treasuries with 93 days or less remaining to maturity, overnight Treasury repo and reverse repo, and money market fund securities invested in the same assets. MiCA requires issuers of e-money tokens to deposit the funds they receive in a separate account at a credit institution and invest them in secure, low-risk assets in the same currency. The reserve is a warehouse, not a balance sheet.

So credit has to be manufactured elsewhere and settled in the token, a different business from issuance, and the panel showed it: a private credit manager, a global custodian, an asset management arm that distributes. Two sessions worked the same seam, "Aave V4: Scaling Onchain Lending", a fireside with Stani Kulechov of Aave Labs moderated by Jacquelyn Melinek, and "Building Sustainable Yield in DeFi: Lending, Liquidity and Risk" on the Taostats Stage, with Tuongvy Le of Veda, Xiao-Xiao J. Zhu of Jupiter and Travis Hayes of Temple, moderated by Christine Lee. Contrast the tokenised deposit, a claim on a bank that lends, where credit already sits where supervisors look. The question for any stablecoin-settled credit proposal is whose balance sheet absorbs the loss.

Rails, settlement and the compliance word in the title

"The Current State of Global Stablecoin Rails: Payments, Settlement and Compliance" ran on the Taostats Stage on Wednesday 3 June, 14:40 to 15:10, with Christian Niedermüller of LDC EU, part of the LianLian Group, Josiah Senu of Zuba and Suzanne Morsfield, billed as CFO of Lukka. Eddie Chong moderated. Compliance in that title is not decoration. It is the integrity objection as an operating problem, and why the regimes below attach obligations to issuance, conversion and custody rather than to the token in transit.

Counting the track by title misleads once. "Beyond Stablecoins: Mastercard and the Future Rails of Agentic Commerce", a Day 1 fireside with Mastercard's Ken Moore moderated by Christine Lee, is tagged Tokenisation of Finance and Agentic AI, not stablecoins.

Five jurisdictions, three deadlines still open

United States. The GENIUS Act became law on 18 July 2025. Monthly reserve reports must be certified by the issuer's chief executive and chief financial officer, and examined by a registered public accounting firm. On 17 August 2026 Treasury issued a notice of proposed rulemaking on what counts as issuing a payment stablecoin in the United States, and what offering or selling one to US persons means. Per that notice, licensing requirements begin 18 January 2027, further restrictions 18 July 2028.

European Union. MiCA's stablecoin titles have applied since 30 June 2024, the rest since 30 December 2024. Get the taxonomy the right way round, the commonest error in trade coverage: a euro or dollar payment stablecoin in the EU is an e-money token, referencing one official currency, not an asset-referenced token, which references baskets or commodities. Its issuers must redeem at par, at any moment, on request. The Commission opened two MiCA review consultations on 20 May 2026, both closing 31 August.

United Kingdom. On 22 June 2026 the Bank of England published a policy statement and draft rules for systemic stablecoins. It raised the maximum share of backing held in interest-bearing short-term UK government debt to 70%, up from the 60% consulted on, the rest in central bank deposits. It dropped the temporary holding limits it had proposed and substituted a temporary issuance guardrail per systemic stablecoin, initially £40bn, to be removed once risks to credit provision recede. Feedback closes 22 September 2026, with regulated stablecoins expected to operate in the UK from 2027.

Singapore. On 1 September 2026 the Monetary Authority of Singapore published draft amendments to the Payment Services Act 2019 implementing its single-currency stablecoin framework. According to a Gibson Dunn note, on which this rests rather than the MAS paper itself, the proposals create a standalone stablecoin issuance licence, treat single-currency stablecoins as digital payment tokens carved out of the e-money definition, require reserve assets at least equal to par value at all times in segregated trust accounts, and restrict holding out as "MAS-regulated" to licence holders. Comments close 16 October 2026.

United Arab Emirates. The CBUAE Payment Token Services Regulation licenses three activities: payment token issuance, conversion, and custody and transfer. On the mainland only approved Dirham Payment Tokens may be used for retail payments, the merchant transition having ended on 6 July 2025, with foreign payment tokens confined to narrow uses such as paying for virtual assets. ADGM's Financial Services Regulatory Authority finalised an expanded regime for fiat-referenced tokens, covering custody, intermediation and acceptance, effective 1 January 2026. Both points rest on secondary summaries, not the CBUAE and ADGM texts.

Three of the twelve sessions carried the stablecoins tag and nothing else: the closed roundtable, the Paxos session on bringing the Global Dollar Network to Europe, and one main-stage panel, "Beyond USD: The Future of Euro, Sterling and Swiss Franc Stablecoins", on the Hecto Main Stage on Wednesday 3 June, 14:00 to 14:40. Who sat on it, including a serving Bank of England supervisor, is set out in our piece on institutions on stage, which calls it the most unusual booking of the two days. What matters here is that the three currencies in the title sat at three stages of regulatory maturity: euro rules under review, sterling rules in draft, and the Swiss seat filled by a private non-profit association in Zug rather than a supervisor. Composition here is editorial, not purchased.

What the record supports, and what it does not

This post quotes nobody from these sessions, because nobody reported them. As our coverage audit sets out, the coverage collapses into two organiser press releases with no named speaker quotes anywhere, no transcript published and no recordings online. Nor does any of this bill a 2026 speaker for a future edition: that roster is archived, bound to Paris, 2–3 June 2026.

Stable Day ran on 3 June in the Palais du Louvre, and its page says flatly that it "is not a conference to explain stablecoins. Everyone in the room already gets it." The 2026 Stablecoin Roundtable ran 08:30 to 10:30 that morning as a closed session, and no attendee list is published. Per the organiser's release it convened senior figures including representatives of Aave, the Bank of England, BlackRock, Paxos and Robinhood, which is an organiser claim, not reporting. The investment case had its own Day 1 fireside, "Investment Opportunities in the Rise of Stablecoins", with Diogo Mónica of Haun Ventures and Rob Hadick of Dragonfly, moderated by Amanda Cassatt.

Five questions to take into the next meeting

  1. Which of the three instruments is on offer, and does the yield prohibition rule it out of the use case pitched?
  2. What standard is the reserve report written to, and how many dates does it cover?
  3. If credit sits anywhere in the structure, where, and whose balance sheet absorbs a default?
  4. Under which licence, in which jurisdiction, will the issuer operate on 18 January 2027?
  5. On redemption at par, is the counterparty the issuer or a secondary market, and on what timeframe?

None of the five is answered by a market capitalisation figure, which is convenient, because nobody agrees what it is.

The record is open: the session archive, the agenda, the speaker index. The next edition is the inaugural Gulf one, at the Louvre Abu Dhabi in the Saadiyat Cultural District, 3–4 December 2026, capped at 2,000 and admitted by application and review: see the edition page and request access. On which December events in the emirate merit the trip, there is a calendar.