Payment Processing for Market Traders at a Glance
Market traders work in conditions that fixed-premises retailers never have to think about: no guaranteed Wi-Fi, no reliable power, and trading days that can run from 6am to 4pm. The wrong reader fails mid-Saturday, with a queue forming and a customer’s card in their hand. We compared the readers traders actually rely on against that test, and the ones below are portable, affordable, and keep working without a Wi-Fi connection.
- SumUp Air: Best overall for most market traders
- SumUp Solo: Best without a smartphone
- Square Reader: Cheapest hardware to get started
- Zettle Reader 2: Best with built-in stock tracking
- myPOS Go 2: Best for instant access to funds
- Dojo Go: Best for very high volume
Market Trader Card Readers Compared
| Provider | Hardware cost | Transaction fee | Connectivity | Monthly fee | Settlement |
|---|---|---|---|---|---|
| SumUp Air | ~£39 | 1.69% | Bluetooth + phone | £0 | 1 to 3 days |
| SumUp Solo | ~£79 | 1.69% | Standalone 4G | £0 | 1 to 3 days |
| Square Reader | £19 | 1.75% | Bluetooth + phone | £0 | Next day |
| Zettle Reader 2 | ~£59 | 1.75% | Bluetooth + phone | £0 | 1 to 2 days |
| myPOS Go 2 | ~£49 | 1.10% + £0.07 | Standalone 4G | £0 | Instant |
| Dojo Go | Rented | From 1.2% | Standalone 4G | £20 to £25 | Next day |
Rates correct as of May 2026. Dojo rates are indicative; final rates depend on monthly volume.
Best Payment Processing for Market Traders
Best Overall: SumUp Air
The SumUp Air is the default UK market-trader card reader, and we rate it the right first call for most stalls. At 1.69% with no monthly fee, no contract, and hardware at around £39, it is the lowest-cost no-contract option available. The blended rate covers Visa, Mastercard, and American Express without a separate Amex surcharge, which is exactly what you want when a tourist hands you a US Amex on a busy Sunday. Battery life covers a full trading day in most conditions; carry a power bank for all-day outdoor events.
Best Without a Smartphone: SumUp Solo
The SumUp Solo costs around £79 and runs standalone on 4G with its own screen, so no phone is needed. If you want a reader you can hand to a customer or a family member without giving up your own phone, the Solo solves a real friction for modest extra cost. You get the same 1.69% rate and the same no-contract terms as the Air.
Cheapest Hardware: Square Reader
At £19, the Square Reader is the lowest-cost UK card reader, and we would point a trader with a fixed product range here first. It pairs via Bluetooth to your phone and includes the free Square POS app with stock management, so you get an inventory system without paying extra for it. The transaction rate is 1.75%, and settlement lands the next business day.
View Square Reader on Square →
Best for Stock Tracking: Zettle Reader 2
At around £59, the Zettle Reader 2 includes the Zettle POS app with product management, stock levels, and low-stock alerts. If you are a craft trader with 50 or more SKUs, or a food vendor watching daily depletion, that bundled inventory is what makes the extra hardware cost worth it over the SumUp Air. For a trader with a handful of lines, it is more reader than you need.
Best for Instant Access to Funds: myPOS Go 2
The myPOS Go 2 costs around £49, runs on its own 4G SIM, and settles funds instantly to a myPOS e-money account. If you buy your restocks out of that same day’s takings, we rate that instant settlement the feature that decides it, because waiting two days for your own money is the difference between restocking tonight and missing tomorrow’s pitch. The transaction rate is 1.10% + £0.07, and a £3.99 monthly maintenance fee applies after the first year.
Best for High Volume: Dojo Go
If you are processing £2,000 or more a week in cards, Dojo Go’s negotiated rate (typically 1.2% to 1.5% at volume) starts to offset its £20 to £25 monthly rental. The standalone 4G terminal has a built-in printer and next-day settlement. Before you commit to the monthly subscription, we would run a Dojo quote against your last three months of card takings; below that volume, the rental eats the rate saving.
How to Choose Payment Processing for Market Trading
Connectivity. Bluetooth-paired readers (Square, SumUp Air, Zettle) lean on your phone’s 4G signal. Standalone readers (SumUp Solo, myPOS Go 2, Dojo Go) carry their own SIM. For rural markets, festivals, or any pitch where the signal drops, standalone 4G is the safer bet, and we would check coverage at your specific pitches before committing to anything phone-dependent.
Volume. Under £2,000 a week, pay-as-you-go (SumUp Air, Square, Zettle) almost always wins on net cost. Above £2,000 a week reliably, weigh Dojo’s monthly fee against the rate saving. If you trade seasonally, stay on PAYG even at your busy peaks, because a monthly fee still lands in the quiet off-season months when you are not earning.
Battery. Every Bluetooth-paired reader needs a charged phone to work. The SumUp Air and Solo have internal batteries rated for hundreds of transactions, but carry a power bank regardless of which reader you use; a dead battery at 2pm costs you the rest of the day’s card sales.
Market Trader Payment Fees and Costs to Watch
Refund policy. SumUp does not return the transaction fee on a refund. Square does. If you sell clothing, gifts, or anything with a higher return rate, that difference adds up over a season, so factor it in rather than judging on the headline rate alone.
Keyed-in transactions. If you ever take card details over the phone for a pre-order or deposit, most readers charge a higher rate for manually entered transactions: Square charges 2.5% keyed-in versus 1.75% in person. Use a payment link for remote payments instead, and you keep the lower rate.
Foreign cards. Most flat-rate providers fold EU and non-EU cards into the blended rate, and SumUp’s 1.69% covers Amex. If tourist volume is significant at your pitch, confirm this with your provider before you assume it, because a surprise surcharge on overseas cards quietly erodes your margin.
Frequently Asked Questions
Yes. Standalone 4G readers (SumUp Solo, myPOS Go 2, Dojo Go) carry their own mobile data and do not need Wi-Fi. Bluetooth-paired readers (Square, SumUp Air, Zettle) rely on your phone’s 4G, which is fine at most outdoor sites but patchy in rural or remote pitches. Check cell coverage at your specific pitch before you decide.
Under £2,000 a week in card volume, PAYG wins on total cost: the rate difference does not cover a monthly subscription. Above that reliably, compare a Dojo quote against your current PAYG costs. If you trade seasonally (Christmas markets, summer festivals only), stay on PAYG even at your higher weekly peaks, because monthly minimums still hit in the quiet periods.
The UK contactless limit is £100 per transaction. Payments above £100 need chip and PIN. Apple Pay and Google Pay have no contactless limit, because authentication is handled by the customer’s own device. Every reader in this guide supports the £100 limit as standard.
Not separately. SumUp, Square, Zettle, and myPOS are payment facilitators: you collect under their merchant ID. That means faster sign-up, minutes rather than days, but it also means they can hold or close your account if they flag unusual activity. For most market traders that is not a practical worry, but if you trade at high volume or in a higher-risk category, consider a dedicated merchant account through an acquirer like Dojo or TakePayments.
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How we reviewed these readers. Our methodology scored each card reader on transaction rate, hardware cost, connectivity, settlement speed, and contract terms. We verified rates and terms against each provider’s published pricing and the FCA Register. Verification date: May 2026. We did not field-test the hardware ourselves; the figures here are drawn from provider documentation.