Mid-market rate
The mid-market rate is the midpoint between the buy (bid) and sell (offer) prices for a currency pair in the wholesale market at a given moment. It is the usual benchmark for measuring how much margin a provider adds to an exchange rate.
How it works
The mid moves with every quote, so benchmarks publish snapshots. The WMR 4pm London closing spot rates take a mid from the median bid and offer over a five-minute window, from 2 minutes 30 seconds before to 2 minutes 30 seconds after 16:00 UK time. These closing rates are designated critical under the UK Benchmarks Regulation.
Central banks publish reference rates too. The ECB publishes euro reference rates around 16:00 CET each working day, based on a concertation among central banks around 14:10 CET, and says they are for information only, strongly discouraging their use for transactions. The Federal Reserve's H.10 release gives noon buying rates in New York, certified for customs purposes.
For treasury, the mid is a measuring stick, not a dealing price. A firm buying a currency pays the offer and a firm selling gets the bid, so even a fair dealer quote sits off the mid. When comparing providers, use the same timestamped source, because the mid an hour later can move by more than the margin being measured.
Example
At 10:00 a dealer quotes EUR/USD at 1.0848 bid and 1.0852 offer, so the mid-market rate is 1.0850. A firm buying EUR 1,000,000 at the offer pays $1,085,200. That is $200 more than the $1,085,000 it would cost at the mid.
Frequently asked questions
Can we trade at the mid-market rate?
Rarely. Dealers buy at the bid and sell at the offer. Some providers convert at the mid and charge a separate fee instead.
Is the ECB reference rate a mid-market rate?
It is a daily reference snapshot published for information. The EU uses it as the benchmark for disclosing currency conversion mark-ups on card payments.
Where Polynopsis fits
Polynopsis shows balances in every currency across banks, partners and exchanges in one position, so the team can see each currency's exposure at a glance.
Compared with
Related terms
Sources
- WMR FX Benchmarks Spot, Forward, NDF and Metals Rates methodology, v30 (January 2026) · LSEG / FTSE Russell
- WMR FX Benchmark Statement · LSEG / FTSE Russell
- Euro foreign exchange reference rates · European Central Bank
- Foreign Exchange Rates, H.10: about the release · Board of Governors of the Federal Reserve System
- Regulation (EU) 2021/1230 on cross-border payments in the Union · EUR-Lex, Publications Office of the European Union
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About Polynopsis
Polynopsis is liquidity management software for cross-border payment companies. The name joins poly, many, and synopsis, a seeing together: one live view of money spread across many banks, payout partners, exchanges and stablecoin wallets, including money in flight, with a warning before any corridor runs dry.
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