1 Connect one source2 See your scan3 Decide if it’s worth fixing

See what your 1099-DA likely overstates. Free, 3 minutes, no card.

Upload a single exchange export below. The scan runs on read-only data and shows what we found before you create an account or pay anything.

Upload a CSV

A transaction-history export from your exchange. We auto-detect the format — Coinbase and Kraken live, more formats landing weekly.

Drop file or

Paste a wallet address next

Ethereum, L2s, Solana, Bitcoin. Chain auto-detected; ENS works.

On-chain connections open shortly — save a scan and we’ll email you the moment they do.

Read-only API key next

Withdrawal-enabled keys will be rejected automatically — read-only by design.

Exchange API connections open shortly.

Read-only by design · no account needed yet · data deleted in 7 days if you don’t continue
Connect one source2 See your scan3 Decide if it’s worth fixing

Scanning

Detecting the format, rebuilding lots, and checking every disposal line.

Nothing leaves this scan — no account, no card, read-only data only.

Connect one source2 See your scan3 Decide if it’s worth fixing

Your scan is done.

transactions found
your 1099-DA likely overstates your gains by this much (blank-basis lines at $0 cost)
rows needing attention — visible, never silently dropped
WHAT THE SCAN SEES
SignalValueStatus

Estimates use FIFO defaults on scanned data. The paid rebuild verifies every line to the cent, with evidence.

Save your scan — free full preview

This scan expires on . Save it to keep going free: connect the rest, resolve decisions, see your complete corrected numbers and what optimization saves you. Your founding price locks at — pay only when you want the documents.

Unsaved scans auto-delete in 7 days — we mean the privacy promise.

Share the damage (anonymized)

clearbasis · free scan
Checked in minutes · numbers rounded · identity stripped
Share to X Sharing is optional, always anonymized.
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We couldn’t auto-detect that format — yet.

The file uploaded fine, but it isn’t one of the formats we recognize automatically today. New formats land weekly; a manual column-mapper is on the way.

The uploaded data still auto-deletes in 7 days. Nothing is kept beyond that.