Your phone line's registration determines whether you can sign up for Karrot or not. The reason is identity verification (본인인증, real-name phone verification): Karrot requires a Korean mobile carrier to confirm that you are who you say you are, using a number registered under your real name. For a foreign resident, that means the carrier must have the line registered under your Alien Registration Card number (외국인등록번호), not your passport number. That's where most sign-up attempts fail, and it's the step no English-language walkthrough explains.
Karrot (당근마켓, commonly called 당근) is a neighbourhood secondhand-trading app. People list furniture, appliances, electronics, and everyday goods for buyers in the same area. For a first month in a new apartment, it's where a lot of the furnishing happens. For the sequence of moving-in steps that leads you here, see the first-month housing timeline.
This guide covers signup, what the English setting does and doesn't change, neighbourhood verification, how trades are arranged, safe payment, your rights in a private sale and where they run out, the fraud patterns worth knowing, and what to do when something goes wrong. For housing deposit fraud specifically, that's covered in the separate how to avoid deposit scams guide.
Before you sign up: the phone registration requirement
The ARC number requirement
Karrot's sign-up process runs through Korean-carrier identity verification. The carrier confirms the phone number belongs to you by checking the name registered to the line.
For a foreign resident, the name on file must match your Alien Registration Card number (외국인등록번호). Many carriers register a new foreign customer's line under their passport number by default. That setup fails Karrot's verification.
The fix: contact your carrier (SKT, KT, or LG U+, at a branch or customer service line) and ask them to update the identification number attached to your line from your passport number to your ARC number. Once the carrier makes the change, Karrot's verification completes normally. You need your ARC in hand before making that request.
Dual-number services don't work
A dual-number or second-number service (듀얼넘버, 투넘버, 세컨드 넘버) cannot complete Karrot identity verification. Carriers do not support identity confirmation or certificate issuance for secondary numbers.
A phone registered to a corporate account (법인폰) can complete verification if the carrier's own corporate identity-verification service supports that plan. Ask the carrier directly.
Overseas phone numbers
The documented verification path requires a Korean carrier and a Korean number. The Korea SIM card guide covers getting a Korean line.
Account limits
One identity can hold up to three Karrot accounts. A phone number registered to someone else's name cannot be used to create an account.
The English setting: what changes and what doesn't
Karrot has a language setting independent of your phone's system language. Find it at My Karrot > Settings > Language. Set it to English there and the app's menus, buttons, and system messages display in English.
Listing text is different. Each listing is written by the person who posted it, in their own words. If a seller wrote the description in Korean, you see Korean.
A reader expecting English listings will find most of the marketplace inaccessible without Korean reading ability or a translation tool. Karrot is a Korean-language marketplace with an English interface option.
Neighbourhood verification (동네인증)
Neighbourhood verification (동네인증) ties your Karrot account to a physical location using your phone's GPS. It confirms you are actually in the area where you are browsing and listing.
Verification expires. Karrot asks you to re-verify periodically before the existing verification lapses. The number of verifications appears on your profile.
Faking or gaming neighbourhood verification is explicitly listed by Karrot as a fraud-signal category that triggers immediate account sanctions, even before any actual harm occurs. Do not attempt it.
How trades are arranged
In-person trade (직거래)
Most Karrot trades happen in person. You and the other party agree on a meeting point, you inspect the item, and you pay by cash or bank transfer. Karrot states directly that once the item changes hands, the platform cannot help with defects discovered afterwards. Inspect before you pay.
For payment without sharing your bank account number, Karrot Pay (당근페이, Karrot's in-app payment product) offers a simple in-person transfer option.
Parcel trade (택배거래)
For items where a meeting is not possible, the seller ships by courier. Karrot recommends using its bundled payment and courier service for these trades rather than an ordinary direct-bank-transfer-plus-courier arrangement.
Distant items: buy-now (바로구매)
Items listed in a neighbourhood outside your verified range have a different purchase path. The default, and generally the only option available, is buy-now (바로구매): a combined parcel and escrow flow where Karrot holds your payment until you confirm receipt. Ordinary direct chat negotiation for distant-neighbourhood items is not available as standard.
Free giveaways (나눔)
A listing posted at 0 won is automatically labelled as a giveaway (나눔). Interested neighbours start a chat, or the giver opens an application event. Either way the giver chooses who receives the item, and Karrot states plainly that a giveaway is not first-come-first-served. To post a giveaway, set the price to zero.
The reputation signal: manner temperature (매너온도)
Every Karrot account carries a manner temperature (매너온도): a reputation score visible to the person you are chatting with before a trade. It rises as the account is active on Karrot and falls when the account receives policy warnings or negative ratings from counterparts, such as broken meeting promises or disputes.
Karrot's own guidance: a low score is a reason to look more carefully at the account's re-trade willingness rate and past reviews. Use it as one signal alongside the rest of the profile.
Paying safely: 안심결제 and what it protects
How escrow-style payment works
Karrot's safe payment feature (안심결제) holds the buyer's funds during the trade. The seller receives the money only after the buyer taps confirm purchase (구매확정). Until that tap, the funds stay with Karrot.
Do not tap confirm purchase before you receive and inspect the item. A seller who asks for pre-confirmation before the item arrives is flagged by Karrot as a fraud signal. Tapping early defeats the protection entirely.
After the buyer confirms, the seller is settled to their Karrot Pay balance the same day, though Karrot says some trades take longer.
Direct bank transfer carries no protection
Karrot states plainly that it cannot assist with a trade that went wrong after a direct bank transfer. That includes a transfer framed as "당근페이 송금" (Karrot Pay remittance) sent to an external bank account. An account whose holder name contains "당근페이" or "당근마켓" in an external transfer context is a recognised impersonation pattern. Do not send money to it.
Private sales and consumer rights: what the law says
When you buy from an online store in Korea, the E-Commerce Consumer Protection Act (전자상거래 등에서의 소비자보호에 관한 법률) gives you the right to withdraw from the purchase (청약철회). Article 17(1) states that right applies to a consumer who has bought from a 통신판매업자 (mail-order-sale business operator). Article 2(3) defines 통신판매업자 as a person who sells by mail order as a business.
A private individual selling a used item on Karrot on a one-off basis generally does not sell as a business in the Article 2(3) sense. A newer provision, Article 20-4(1), addresses individual-to-individual marketplace transactions. It places a duty on the platform to verify the individual seller's identity information. It does not create a cooling-off refund right for the buyer against that individual. Article 3(3) of the same Act makes the scope explicit: it disapplies Articles 17 to 19 (which include the cooling-off right) when the platform is brokering sales between private individuals.
What follows from those provisions together: the statutory withdrawal right that applies when you buy from an online store generally does not attach to a private person-to-person Karrot sale.
Losing the cooling-off right is not the same as losing every remedy. Under Korea's Civil Act, a buyer who receives a defective item can seek rescission or damages (Articles 109(1) and 580). The government's dispute-resolution criteria for person-to-person trades (개인 간 거래 분쟁해결기준), which Karrot itself helped set, also confirm that seller responsibility for defects persists even after the buyer confirms the purchase. These civil remedies are separate from the 청약철회 right.
Safe payment, in-person inspection, and the other steps in this guide carry more weight on Karrot than they do in retail e-commerce. They protect you practically before a problem arises. New-goods e-commerce, where a business seller's statutory obligations apply, is covered separately in the Korea online shopping guide in this cluster.
Patterns worth recognising
Karrot documents its own fraud patterns and applies sanctions when multiple signals appear together, even before a victim reports harm.
Risky listing patterns. Items where in-person inspection is impossible. Items priced well below market value. High-liquidity goods such as gold or foreign currency. These patterns tend to push the buyer toward a direct bank transfer before they can inspect what they are buying.
Chat evasion. A counterpart who sends a phone number or bank account number as a photo rather than as text. A counterpart who splits a number across several messages. Both are documented methods to avoid in-app fraud detection.
Account rental. Advertisements on outside social media offering payment to borrow your Karrot account for a few days of claimed "promotional use." The borrower uses the account to commit fraud. Karrot applies a permanent ban to any account involved and cooperates with law enforcement on search warrants. There is no safe version of this arrangement.
Gift card trades. Certain store gift cards can only be confirmed as usable by visiting a physical store and scanning the barcode. Sellers exploit this delay. If you buy a gift card remotely, use 안심결제 and only confirm purchase after checking usability in-store.
Off-platform redirection. A seller who steers the conversation outside the app, to Telegram, KakaoTalk (카카오톡), or an external payment link. Karrot states explicitly that the purpose is to route around its in-app detection systems. Stay in the app.
나눔 scams. A giver who requires you to move to a KakaoTalk open chat room, share personal information, share a Karrot verification code, or handle a re-sell arrangement as a condition of receiving the free item. These are documented fraud signals. A genuine 나눔 requires nothing except showing up to collect.
If a trade goes wrong: step by step
Step 1: Check before going further. Look up the counterpart's phone number or bank account number at the National Police Agency Cyber Bureau's free lookup tool at cyberbureau.police.go.kr. The tool compares the number against recent cybercrime reports. A flagged result is a reason to stop. The police note that a clean result does not guarantee the counterpart is trustworthy: it only means no reports matching that number have accumulated past the threshold.
Step 2: Report through the app. Use Karrot's in-app report button (신고하기) to flag the account.
Step 3: Contact the police. Call the police call centre on 182 (paid call), or file online first through the Cybercrime Reporting System (사이버범죄 신고시스템, ECRM) at ecrm.police.go.kr. Filing online first shortens the required follow-up visit to a police station. The four steps are: online filing, police station visit, investigation, case closure.
Only the direct victim can file through ECRM. A family member or representative must either visit a police station in person or use the National Petition Portal (국민신문고), which allows proxy filing.
The ECRM does not accept civil disputes. Refund disagreements, delivery delays, and arguments between two parties about an item's condition are out of scope for this channel. A bad trade is not automatically a police matter. If the counterpart disappeared with your money after a deliberate deception, that is a crime. If the item arrived and the two of you disagree about its condition, that is a civil matter.
Step 4: Preserve identifying evidence. Save the counterpart's profile ID (the "#" followed by letters and numbers shown next to the profile name), their nickname, and the chat room's creation time. These are the details police request when the counterpart's real name and contact information are unknown. A police search-and-seizure warrant (압수수색검증영장) addressed to Karrot allows investigators to obtain the counterpart's identity from the platform. Per the Ministry of Government Legislation guidance on easylaw.go.kr: if the fraud involved a Karrot Pay transfer, the warrant must name both Karrot and Karrot Pay as separate execution targets.
Step 5: Ask your bank about a payment freeze. If money moved by bank transfer, contact your bank and ask about a payment freeze (지급정지). Korean law provides a mechanism to freeze the receiving account while a formal refund claim is processed, and the Financial Supervisory Service describes the procedure. Be aware that the mechanism was built for telecom-based financial fraud, so whether it reaches an ordinary marketplace transfer depends on the case. Ask your bank directly rather than assuming it applies automatically, and do it quickly: a freeze is far more useful before the money moves on.
Frequently asked questions
Can I sign up for Karrot before I have an Alien Registration Card?
Probably not. Karrot requires identity verification through a Korean carrier, and the carrier must have the phone line registered under your Alien Registration Card number (외국인등록번호). If your carrier registered the line under a passport number, ask the carrier to update it. If you do not yet have an ARC, you need to wait for it before signing up.
What does the English language setting on Karrot change?
It changes the app menus, buttons, and system messages to English. Each listing is written by the individual seller in their own words. Expect most listings in Korea to be in Korean.
What is neighbourhood verification (동네인증) and do I need it?
Neighbourhood verification uses GPS to confirm your physical location and tie your account to a local area. It expires periodically and must be renewed. Your verification count is visible on your profile. Faking it triggers immediate account sanctions.
What is the safest way to pay for a Karrot purchase?
Use safe payment (안심결제) for any non-in-person trade. Karrot holds your funds until you confirm receipt. Do not confirm receipt before the item arrives, even if the seller asks. For in-person trades, inspect the item before handing over any payment.
What consumer rights do I have if a private seller sends me a broken item?
The statutory withdrawal right (청약철회) does not apply to purchases from a private individual; Article 17(1) limits it to business sellers (통신판매업자), which a private Karrot seller generally is not. You are not without remedy, however: under Korea's Civil Act, you can seek rescission or damages for a defective item (Articles 109(1) and 580), and the government's dispute-resolution criteria for person-to-person trades (개인 간 거래 분쟁해결기준) confirm that seller responsibility for defects persists even after you confirm the purchase. Inspecting before payment and using 안심결제 remain the practical protections.
What are the main warning signs of a Karrot scam?
A request to move the conversation off the app to Telegram, KakaoTalk, or an external payment link. An unusually low price on an item that cannot be inspected in person. A request to confirm purchase before the item arrives. A phone number or bank account number sent as a photo or split across multiple messages. These are all documented fraud patterns.
What should I do if I have already sent money and the other person has stopped responding?
Call the police call centre on 182 (paid call) or file online at ecrm.police.go.kr. Also report through Karrot's in-app report button (신고하기). Save the counterpart's profile ID (the # ID shown next to their name), their nickname, and the chat creation time as evidence. Ask your bank about a payment freeze (지급정지) if the money moved by bank transfer.
What is 나눔 and how does it work?
나눔 is a free giveaway. A listing posted at 0 won is automatically labelled as such by the app. Interested neighbours start a chat, or the giver opens an application period. Either way the giver chooses who receives the item: Karrot states a giveaway is not first-come-first-served. Any giveaway requiring you to move to another app, share personal information, or share a verification code is a documented scam pattern. A genuine 나눔 requires nothing except showing up to collect.