One shelf. Every channel.
Macfax is one catalog of Macs from every major channel, each listing normalized into a record: the exact configuration, an honest price read on what it really sells for, and, where the seller ran the free app, a signed report you can check.
From listings scattered everywhere to one readable catalog.
Listings come from everywhere
Macfax watches the places Macs actually sell and also lists Macs sellers bring here directly. The sale stays where the listing lives; when you pick one, we link you straight out to the seller.
Every listing becomes a record
Ad copy becomes exact specs: model, chip, memory, storage, year. Junk and auction bids drop out, and each configuration shows what it sells for next to what sellers ask. You compare like for like.
Proof attaches to the record
Sellers run the free Macfax app to put a signed report on their listing's record. The badge means the Mac itself was checked; open the report and read what was checked, when, and by which machine.
How a Macfax report is bound to one specific Mac.
The badge on a listing is only as good as the report behind it. These are the four components that make a Macfax report un-replayable across devices.
Server-issued nonce
Every report request begins with a server-issued nonce. The seller's app embeds it in the diagnostic payload. This prevents replay attacks where a seller would save an old report and reuse it for a different device.
Apple's Activation Lock attestation
Before any heavy diagnostic runs, we check Apple's Activation Lock and Find My state. A device with Activation Lock on cannot be transferred to a buyer; we surface that immediately.
Device-bound key fingerprint
The Macfax app generates a per-device key inside the Secure Enclave on Apple Silicon, signs the diagnostic payload with it, and the fingerprint is published on every report (Basic and Premium). The same Mac always produces the same fingerprint; another Mac can't replay it. On a Premium report, the buyer's app re-derives the fingerprint on the Mac they received and the server confirms the match. That's the case-swap defense; the in-app re-verification flow is what Premium unlocks.
Hardware fingerprint hash
We hash the chassis serial, logic-board serial, and model identifier together. On a logic-board swap (a common Mac Studio attack vector), the chassis and logic-board serials disagree, and the hash changes. The report records the hash; mismatch is detectable.
A doorstep check for paranoid buyers.
The report page is the value most buyers need before they pay. For high-value or cross-border transactions, a buyer can re-derive the device-key fingerprint on the Mac they actually received and match it against the report. This catches case-swap fraud at the doorstep. It's optional, anonymous, and free.
Every report URL has a .json twin.
Append .json to any report URL to get the structured payload, useful for programmatic verification by escrow agents, marketplaces, or third-party tools.
$ curl -s https://macfax.com/r/k7m4q9xa.json
{
"id": "k7m4q9xa",
"model_name": "Mac Studio (2025)",
"chip": "Apple M3 Ultra",
"memory_gb": 512,
"storage_gb": 8000,
"hardware_verified": true,
"activation_lock": false,
"mdm_enrolled": false,
"issued_at": "2026-05-04T14:22:00Z",
"signing_key_id": "ec:48:7a:91:2f:b3:6d:c0:...",
"verification_chain": [ ... ]
}Where Macfax fits next to a PDF report or an Apple Coverage Check.
PDFs and screenshots are unbound from the device and trivially editable. Apple's Coverage Check tells you whether a serial is real and what warranty it has, but says nothing about whether the Mac in front of the buyer is the same Mac the serial belongs to.
| Feature | Macfax | PDF report | Apple Coverage Check |
|---|---|---|---|
| Verifies the serial is real | |||
| Catches case-swap fraud | |||
| Diagnostic burn-in | |||
| Buyer re-verifies on receipt | |||
| Bound to the specific Mac |
Ready when you are.
Browse the shelf, or run the checks and put your Mac on it. Free for both sides, no account, money-back guarantee on Premium.