Stratum vs ALTINVEST for Bitfinex lending.
Stratum keeps 0% of your interest on a flat $9 / $29 / $99 plan — so every extra dollar you earn stays yours, no matter how big your book gets. You also get 11 named, backtested strategies you can verify and tune, paper mode before you risk capital, and ledger-correct earnings and tax exports. Both bots are non-custodial, so custody is not the deciding factor; ALTINVEST is a closed “AI” bot reportedly priced around ~$3/mo plus a ~3% cut of your interest — a slice that grows with every dollar you make.
ALTINVEST details are from public sources as of 2026 and may change; figures such as the ~$3/mo fee and ~3% cut are described qualitatively because they vary by source. Stratum return figures are backtested/modeled, never guaranteed.
Side by side
ALTINVEST column reflects its publicly described model (an “AI strategic lending bot” for Bitfinex with per-user rate dashboards and interest reports, reportedly priced around $3/mo plus a ~3% cut of interest earned) as of 2026. The “AI” label is ALTINVEST’s own marketing and is not independently verifiable. Exact pricing varies by source and may change.
When ALTINVEST might be the better pick
At very small balances, a ~$3/mo fee plus a 3% cut of interest is a tiny number in absolute dollars and can come in under Stratum’s flat $9/mo entry, so if you are lending a modest amount and care most about the lowest cost today, ALTINVEST can be cheaper. It also leans on per-user rate dashboards and a heavy library of Medium content if you prefer a content-forward product. As your balance grows, though, the 3% cut keeps scaling while a flat fee does not.
The fee math: a cut scales, a flat fee does not
A ~3% performance cut is a slice of every dollar of interest you earn, so it grows with both your book size and the funding rate. A flat subscription does not move. That means a percentage cut is cheaper on a small balance and a flat fee is cheaper on a large one — there is a crossover. The table below is illustrative, using a 10% APR assumption and ALTINVEST’s ~3% cut on interest, with ALTINVEST’s ~$3/mo (~$36/yr) flat component added in.
Illustrative only — actual funding APR varies and is not guaranteed; ALTINVEST’s exact pricing varies by source, and Stratum’s tier at each book size is approximate. The takeaway is the shape, not the cents: below roughly $24K of lent capital (at an illustrative 10% APR) a small flat fee plus a 3% cut is cheaper in absolute dollars, and above it the 3% cut keeps growing until the flat fee pulls ahead and the gap widens. Run your own numbers in the APR calculator.
Transparent strategies, not a black box
ALTINVEST markets an “AI” bot whose strategy logic you cannot inspect. Stratum ships 11 named, backtested strategy algorithms — FRR tracking, rate spreads, maturity ladders, spike catching, and adaptive variants — and lets you replay each on historical Bitfinex funding data, then paper-trade, before risking live capital. You can read how each one behaves and tune it.
Browse the 11 strategies →Reporting and tax built in
ALTINVEST offers per-user rate dashboards and interest reports. Stratum goes further: it reconciles earnings to the Bitfinex funding ledger and exports them as CSV, TurboTax TXF (US Schedule B), German Anlage KAP, and PDF. If filing matters to you, that is hours saved at year-end. Keys are stored AES-256-GCM encrypted with TOTP 2FA, and any withdraw- or trade-capable key is rejected when you add it.
How Stratum secures keys →Stratum vs ALTINVEST FAQ
Is ALTINVEST safe?
ALTINVEST is non-custodial: it connects through a Bitfinex API key, so it operates inside your own Bitfinex account rather than holding your coins. That is the same custody posture Stratum uses. Stratum additionally rejects any key with WITHDRAW or trade scope at the moment you add it, so the connected key can lend but cannot move funds off the exchange. With either tool you still carry Bitfinex platform risk and crypto market risk.
Does Stratum take a cut of my earnings?
No. Stratum charges a flat monthly subscription ($9 / $29 / $99) and never takes a percentage of your Bitfinex lending interest. ALTINVEST is reported to charge a small flat fee (around $3/mo) plus roughly a 3% cut of the interest you earn. That percentage cut grows with both your book size and the funding rate, while a flat fee does not move — so the more you earn, the more a percentage model costs you.
Can I switch from ALTINVEST to Stratum?
Yes. Both are non-custodial, so there is nothing to move on-chain. Create a scoped Bitfinex API key for Stratum (funding enabled, withdrawals disabled), run Stratum in paper mode to confirm behavior, then stop ALTINVEST before turning live offers on. Your funds never leave Bitfinex during the switch.
When is ALTINVEST the better choice?
At very small balances, ALTINVEST’s ~$3/mo plus 3% cut can be a tiny number in absolute dollars — a 3% slice of a small interest figure may total less than Stratum’s flat $9/mo. If you are lending a small amount and just want the lowest absolute monthly cost today, ALTINVEST can be cheaper. The moment your balance grows, the flat fee pulls ahead and keeps your interest whole — and you also get verifiable backtested strategies, paper mode, and structured tax exports.
Is Stratum cheaper than ALTINVEST?
It depends on your book, and the math favors Stratum as you grow. A ~3% cut of interest scales with how much you earn; a flat $9 / $29 / $99 per month does not. On a small balance the percentage cut is a tiny absolute number and can edge out Stratum’s flat fee — but above roughly $24,000 of lent capital (at an illustrative 10% APR) the flat fee wins and the gap keeps widening as your balance and rates rise, because Stratum never takes a slice of your interest. The math is below; on top of it, the flat fee buys backtests, paper mode, and ledger-correct tax exports.
Are Stratum’s returns guaranteed?
No. Every return figure on this site is backtested or modeled, not a live track record. Real out-of-sample funding returns are regime-bound and sit near the prevailing market rate (roughly 8.5–10% APR in our testing). Returns move with the market and are never guaranteed by Stratum or anyone else.
Keep 100% of your interest
Verify the 11 strategies on real Bitfinex funding data, dry-run them in paper mode, then go live on a flat monthly fee that never touches your earnings. As your balance grows, a flat fee beats a percentage cut — run your own numbers and see where you land.