Mercury August Messenger adds Spend controls, exclusive funds, and checkbooks

What happened

On 20 August 2026 Mercury sent its monthly newsletter, The Messenger. The letter bundled several products that are already live or about to be. I matched it against the 11 August Spend post and the 18 August Treasury funds post. The sections below follow the products, not a single mash-up.

Mercury Spend

Spend landed first. The 11 August post says Mercury Spend is live for every Mercury banking customer. Companies that bank somewhere else can buy it on its own. A Team spend tab in the dashboard is where you set budgets and issue cards to teammates.

Budgets can be split by purpose, travel, software, a home-office stipend. When someone swipes or files a reimbursement, the system routes the transaction into the matching budget. Agents can get a dedicated card, and every charge stays visible.

Receipts are meant to arrive without a chase. Official copy lists inbox scanning, text reminders, and photo upload. A card can lock when a receipt is overdue. For the close, transactions are categorized to a budget and a GL at the point of purchase.

The same post says a limited-edition IO card was designed with the artist Simone Bodmer-Turner. Patriot Bank, N.A. issues the IO Card.

Exclusive Treasury funds

On idle cash, Treasury published two Mercury-only funds on 18 August. MCRYX is an ultra-short bond fund built with Morgan Stanley Investment Management and was live that day. MRGXX is a government money-market share class built with State Street Investment Management, due the following week in that post. They replace the previous lineup. Positions already in Treasury migrate automatically, which the email also said.

Yield sits in the footnotes. The email’s top number is about 3.88% annualized. The fine print ties it to the 30-day effective yield on MCRYX as of 14 August 2026, and assumes $20 million or more in combined Mercury deposits. A BusinessWire release the same week said MCRYX’s 30-day effective yield was 4.03% on that date, and Mercury Treasury’s net figure at the $20 million tier is about 3.88%. Treasury charges a monthly fee of 0.15% to 0.60% based on total Mercury balances. MCRYX has a floating NAV, is not a money-market fund, and can lose principal.

Same-day access applies only to money in the State Street U.S. government money-market fund. Instructions need to be in by 3 p.m. Eastern on a business day, and partner processing still applies.

Eligibility is strict. Combined balances across Mercury accounts need to be $250,000 or more, and you have to pass the eligibility screen. Mercury Advisory, LLC, an SEC-registered adviser, offers Treasury. Brokerage and clearing go through Apex Clearing. Treasury accounts are not bank deposits and are not FDIC insured. The help center’s Summer 2026 fund update walks through how old sleeves moved into MCRYX and MRGXX.

Business checkbooks

Some payments still need a paper check. Organizations can now design and order checkbooks in the dashboard. Each organization can order up to six books a year at no cost, 25 checks in each. Incoming checks can be reviewed before money leaves the account.

The path on web is Payments, then Checkbooks. That is a business-account feature. Mercury Personal still mails checks from the dashboard and does not issue a paper checkbook.

Invoices in 100-plus currencies

Invoices can now go out in more than 100 currencies. The customer pays in local currency, and funds show up in USD.

Trust accounts on Personal

Trust accounts are now on Mercury Personal. The email says trust cash can use the same online flow, yield, automations, and permissions. FDIC coverage on revocable living trust deposits is up to $250,000 per owner, per beneficiary, per insured bank, and depends on titling and eligible beneficiaries.

Insights and automations

Insights added line, stacked bar, and Sankey views, with filters for GL code, category, and bank account. Business and personal accounts can both use them.

Reviewed transactions can sync to accounting software daily or weekly. AI categorization can be turned off.

Carddoger takeaway

This is a product roundup. If you already bank at Mercury, Spend is supposed to be in Team spend for budgets and cards. Treasury still needs $250,000 combined and an eligibility check. The yield figure still has a monthly fee, and the number moves with tier.

1. For team cards and agent spend, look for Team spend first, then confirm budgets, receipt rules, and lock policies. Start at the Spend product page.
2. For idle cash in Treasury, check the $250,000 combined-balance gate. 3.88% is a high-tier net yield, not a rate every account gets. Same-day cash is only the State Street government money-market sleeve.
3. Checkbooks, multi-currency invoices, and personal trust accounts are dashboard features. Use whatever is actually switched on in your login. Treasury has no FDIC insurance. Banking services come from partner banks.

Confirm against Mercury’s notices, the fund documents, and the live dashboard. This is a recap of the official newsletter and product posts, not advice to open an account or invest.