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About this tool
Review marketplace messages locally for off-platform payment, fake escrow, overpayment, OTP, remote-access, shipping, fee, and account-takeover signals.
Marketplace Scam Checker reads a buyer or seller message you paste and matches it against 17 deterministic rules grouped into nine warning categories — off-platform payment, fake escrow or courier stories, overpayment, OTP and PIN requests, remote access, urgency, advance fees, shipping pressure and account-takeover instructions — then returns a 0 to 100 signal score and the specific steps to verify before you act. Negations are detected, so a line like 'never share your OTP' does not count against the message. The score is triage, not a fraud verdict: nothing is checked live, and a clean result does not mean the person is genuine.
Open Marketplace Scam Checker on AltFTool — it loads instantly in your browser.
Choose "I am selling" or "I am buying", paste the message into Message text (up to 40,000 characters), and optionally add Listing amount and Claimed payment amount.
Press "Review message" to run the 17 rules across the nine warning categories entirely in your browser — no upload and no lookup.
Read the 0-100 signal score, the redacted evidence cards and Safer next steps, then press "Copy report" or Download for marketplace-message-safe-summary.txt.
Every point in the score traces to a rule with a title and an explanation, so you can see exactly which sentence triggered it.
Advice phrased as a warning — 'do not share', 'never send' — is excluded, so genuine safety messages do not inflate the score.
The exported summary lists categories and counts but deliberately excludes the pasted text, names, links, amounts, codes and addresses.
It is a signal count, not a probability of fraud. Findings each carry fixed points and the total is capped at 100; a score of 30 or one high-severity match raises the assessment to 'important checks needed', and 58 or more, two high-severity matches, any remote-access or account-takeover signal, or overpayment combined with an advance fee raises it to a strong warning cluster.
No. Zero means none of the 17 configured rules matched, which is not confirmation that the listing, buyer, seller, payment, courier or shipment is legitimate. A scam written in wording the rules do not cover will still score zero, so verify payment and delivery inside the official marketplace regardless.
No. A one-time password, PIN or verification code sent to you authenticates you, and no genuine buyer, seller, courier or marketplace agent needs it — a request for one is flagged here as a high-severity account-takeover signal. If you have already shared one, change your credentials through the official app and review active sessions.
No, the analysis is pure pattern matching that runs in your browser, with no network call and nothing saved. Up to 40,000 characters are analysed per message, and anything past that is truncated with a note.
Add the Marketplace Scam Checker widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
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