Data we need
Your pool composition and existing underwriting criteria. Optional: historical loss data for calibration. Reads through the standardized per-module KeyScore signal — no bespoke schema per lender.
Keystone for lenders + GSEs · Callisto Bridge
Collateral verification software for modular as a financeable asset class. Finally pre-screenable.
What is collateral verification software? A data-infrastructure layer giving lenders a signed, verifiable per-unit record of the assets backing a pool or loan — provenance, quality score, lifecycle state, audit trail — so credit committees, field examiners, rating agencies, and GSEs read the same defensible source of truth instead of reconstructing evidence per audit.
Pool the modules. Get a weighted KeyScore. Get an AAA → NR indicative pool grade. Get a senior / mezz / equity tranche pre-screen ready to hand to an NRSRO partner for formalization. One API call, one verified record, one consistent underwriting model across every deal — the asset-based lending technology layer under every modular pool your team screens, with GSE-compliant asset verification that Fannie Mae, Freddie Mac, and their aggregator counterparties can read against the same signed record your NRSRO partner rates.
What's different for you
Three things every lender conversation opens with.
What stays with your partners
NRSRO partners (KBRA, DBRS, Fitch, S&P, Moody's) issue every official credit rating. SEC-registered broker-dealer partners place any securities. Keystone provides the indicative pool-grade pre-screen — never a rating.
What a pilot looks like
One sample pool (20-200 modules) with a source manufacturer of record. Pre-screen output the same day: weighted KeyScore + AAA-NR indicative grade + senior/mezz/equity tranche pre-screen.
What's broken about modular underwriting today
Every modular deal gets underwritten by a different shop with a different model. Quality signals vary by manufacturer, by factory, by inspector, by year. Pools blend inconsistent collateral. Ratings agencies hesitate. The result: modular collateral trades at a spread to comparable site-built, not because the underlying risk is worse, but because nobody can prove it.
What Keystone fixes
- One scoring model — KeyScore 0–99 is the same math across every manufacturer, every factory, every module
- Auto-verified provenance + defensible audit trail for lenders — module hash + hash-chained lifecycle events = a defensible underwriting record that reads the same in year one as it does in year ten, without a re-inspection cycle
- Field exam automation / collateral examination software — the same signed record that answers your credit committee also answers the field-exam question set. No bespoke reconciliation per audit, no schedule slip while a third party re-verifies what the manufacturer already attested.
- Indicative pool grade in one call — submit eligible modules, get AAA → NR equivalent + weighted KeyScore + tranche pre-screen
- Securitization-input-ready output — 70 / 20 / 10 senior / mezz / equity, sized to the pool's eligible collateral, ready for an NRSRO partner to formalize
How the regulated work happens. Keystone provides the pre-screen analytics. Official credit ratings, when required for SEC-registered securities offerings, are issued by NRSRO-registered partners (KBRA, DBRS Morningstar, Fitch, etc.). Placement, when required, is executed by SEC-registered broker-dealer partners. See the partner-model architecture.
Who this is for
- GSEs — Fannie Mae's modular initiative, Freddie Mac's Targeted Affordable Housing
- LIHTC syndicators — Boston Capital, RBC Community Investments, Raymond James Affordable Housing, Enterprise CHP, US Bancorp Impact Finance, PNC Multifamily, Stratford, Hudson
- Debt funds — CDFIs, community development financial institutions, impact-debt vehicles
- Private credit — funds underwriting modular as a strategy
- HFA bond programs — when modular collateral backs tax-exempt bond issuances
The economics
Keystone charges a per-pool analytics subscription, plus revenue-share arrangements with NRSRO + broker-dealer partners when they monetize the underlying securitization. Pricing is structured to keep regulated activity with the licensed counterparty — Keystone never takes gain-on-sale directly. Standard API integration; the analytics layer itself is included in the Capital Rail tier.
The same KeyScore the manufacturer's QA team trusts is the same number the lender prices the loan on. No translation layer needed.
Related · Applied AI
Underwriting triage, portfolio monitoring, LIHTC-program analytics.
Applied AI ships R&D-grade AI capability into lender workflows — submission triage, portfolio-risk monitoring, and government-program-side analytics — with the same hash-chained audit rigor Keystone applies to verified-asset records.
GUIDED DEMO WALKTHROUGH FOR YOUR ROLE
Walk the live demo through your lens. A 4-step script tells you which tabs and numbers to look at first.
Open the Lender / GSE / syndicator walkthrough on the demo →
No signup, no auth wall. The guided script lives at the top of /demo/; the live demo runs below it.
Next step
Test the Capital Rail on a sample pool.
The sample workspace ships with two pre-loaded demo pools — both AAA-equivalent indicative grade — so you can see the API contract end-to-end before bringing your own collateral.