← Frederick & Sons
Fifty50
Live flagshipOpen app →
The fair equity split you can prove — powered by what you actually contribute

Own whatyou build.

The equity split · live now100.0% allocated
How it works · 01—03no guessing
01
Log the work
Everyone logs what they actually put in — hours, cash, IP, sales, intros. The receipts, not the rhetoric.
02
Get a fair, explainable split
Fifty50 turns those contributions into a live equity split every founder can see and defend. No 50/50-by-default, no garage-day arguments.
03
Find who's missing
The marketplace matches you with the co-founder or builder your cap table is missing — folded into the same fair model from day one.

Equity should track contribution.
Not who shouted loudest.

Receipts, not rhetoric
Every slice traces back to logged work — hours, cash, IP, sales, intros.
A number you can defend
The split is live and explainable. No 50/50 defaults, no garage-day fights.
Not a securities product
Matching & equity-split only — no tokenizing, no success fees, no custody.
Agent-firstAPI · MCP · chat
A1
Your agent files the work
If an AI agent already logs what you build, it can input contributions straight into the split — a clean REST API with an OpenAPI spec, an agent tool manifest, and an MCP connector. Developer & agent docs →
A2
Humans just chat
No agent? Tell the in-app assistant what you did — “shipped the checkout flow, about six hours” — and it compiles the entry and files it when you confirm. No forms.
A3
Same fair engine either way
However the work arrives — agent, API, or a sentence in chat — the same scoring, co-sign and audit rules apply. Nothing mints equity without the rules passing.
The marketplacefind your missing piece
The missing co-founder problem.

Most teams stall on a gap they can't fill — a technical co-founder, a closer, an operator. Fifty50 matches you with builders on what your team actually needs, and folds them into the same fair, explainable split from the first commit.

Browse the marketplace →
Pricingfree to start · no card required
Free
Live now
$0
Up to 3 partners in a split. Unlimited splits, full contribution tracking, the live explainable split and the audit log — no certificate.
Start free →
Certify
Live
$49 once
A permanent certificate unlock. Mint your split as a cryptographically-signed certificate, issued under our registry-anchored key so anyone can verify it came from us — while the split itself stays private and is never published. Splits stay capped at 3 partners on this plan — for bigger teams, see Team — and re-mint it every time the split rebalances, at no extra cost, forever. One payment, never expires. Composable with Trust Registry, our public non-custodial verification network.
Certify your split →
Team
Live
$79/ 30 days
For teams bigger than three. Up to 50 partners in a single split — Free and Certify both cap a split at 3. Certificates are included while your plan is active, so you do not need Certify as well. One payment covers 30 days; no auto-charge and no card on file. Partners are fixed when a split is created, so a larger plan applies to splits you make from here on. Your plan applies when you’re signed in to the hosted dashboard; the keyless API and agent endpoints stay on the free 3-partner cap for everyone — if you need your plan honoured there, tell us and we’ll wire it to your key.
Start Team →
Business
Coming soon
Not ready yet. The one thing that looked Business-exclusive — a read-only link to share your numbers with an accountant or lawyer — turned out not to need a new tier at all: a 3-partner Certify split needs that exactly as much as a 50-partner Team split does, so we’re building it into Certify and Team instead of gating it here. What’s actually left for Business is running MORE than one split — seeing every venture you own in one place, and exporting them together — and that needs account-linking we haven’t built yet. We also don’t have evidence anyone runs multiple ventures on Fifty50 today, so we’re building the linking first and only pricing this tier if the data says it’s real. Running several ventures right now and want this sooner? Tell us and we’ll say honestly where it stands.
Talk to us →

Partners are fixed when a split is created — there is no add-partner-later step yet, so a larger plan applies to splits you create after upgrading, not to ones you already made. Tracking your contributions and living split is always free. Both paid tiers use the same buy-here-pay-here rail: pay in XRP, RLUSD or Zelle, then redeem your claim code in-app. Certify is a one-time $49 unlock that never expires; Team is $79 per 30 days with no auto-charge — you renew when you choose.

Get the platform
Tokenize the equity split — on-chain, fail-closed.

Want to go beyond decision-support? The Tokenized Partnerships suite wraps Fifty50's fair-split engine in Sentinel's on-chain settlement layer — your equity split becomes a real, auditable on-chain asset. One-time license, self-hosted.

Own what
you build.