One client cash balance. Multiple insured bank deposits. Every dollar reconciled.
A8 Core™ gives non-depository custodians an authoritative beneficial-owner subledger connected to actual FBO bank accounts across multiple FDIC-insured banking partners. It calculates daily client-by-bank allocations, manages insurance capacity, executes placements, reconciles bank balances, tracks gross interest, credits client interest, and accounts for retained spread.
How the model works
The custodian is not a bank. Cash lives at partner banks, in the custodian’s FBO accounts; the client-level truth lives in A8 Core™.
The four connected books
Omnibus cash fails when these books drift apart. A8 Core™ maintains all four and proves their agreement daily.
Client custodial cash
Each client’s cash balance, the number every statement and portal shows.
Actual bank deposits
The real balance in each FBO account at each partner bank.
Beneficial-owner allocations
How every client’s cash is spread across banks, dollar by dollar, day by day.
Interest & program economics
Gross interest received, client interest credited, and spread retained.
FDIC pass-through recordkeeping
Pass-through coverage is a recordkeeping discipline. A8 Core™ maintains the records that discipline requires.
Beneficial owner
Each deposit is recorded to its beneficial owner, not just to the pool.
Ownership category
Records carry the ownership capacity relevant to insurance analysis.
Bank aggregation
Per-owner, per-bank aggregation so capacity is measured where coverage is measured.
Known external deposits
Client-disclosed outside deposits reduce assumed capacity at that bank.
Accrued-interest buffer
A configurable buffer keeps accrual from silently breaching capacity.
Record chain
Daily allocation records are retained and reproducible for any date.
Coverage uncertainty
Where coverage depends on facts outside the records, that uncertainty is stated — never papered over.
Daily allocation engine
Every day, for every client, the engine answers: which banks, how much, and why.
Bank capacity
Available capacity per client per bank, net of external deposits and buffer.
Client exclusions
Clients can exclude banks — an existing relationship, a preference, a directive.
Liquidity
Placements respect expected redemptions and settlement timing.
Yield
Within constraints, allocation can favor rate — policy-driven, never silent.
Concentration
Program-level limits per bank keep the book diversified.
Settlement
Approved allocations become placement instructions with confirmations tracked.
Emergency reallocation
A bank event triggers controlled, recorded reallocation — not a scramble.
Interest & spread engine
The economics are accounted, not estimated.
Gross bank rate
Rates tracked per bank per program, effective-dated.
Daily accrual
Interest accrues daily on actual placed balances.
Client crediting rate
The program’s client rate, applied to each client’s daily balance.
Monthly posting
Client interest posts on schedule with statement-ready detail.
Retained spread
Gross minus credited, computed and booked — auditable program revenue.
Fees & true-ups
Program fees and periodic true-ups handled as first-class entries.
Tax reporting
Interest data flows to tax data & reporting for information returns.
Daily reconciliation
Every book against every other book, every day.
Client subledger to bank accounts
Sum of client cash equals the banks’ FBO balances.
Client allocation to bank balance
Allocations tie to actual placements, bank by bank.
Interest to client crediting
Gross received reconciles to credited plus retained spread.
In-transit items
Placements and redemptions in flight are visible and aged.
Exceptions & certification
Breaks route to exception queues; clean days are certified.
Bank-failure readiness
The test of an omnibus program is the worst day. Readiness is a standing capability, not a fire drill.
Beneficial-owner file
A current owner-level file for any bank, producible on demand.
Bank allocation history
Complete allocation history per bank, per client, per day.
Independent record recovery
Records sufficient to substantiate client claims independent of the bank’s systems.
Historical daily snapshots
Point-in-time state for any prior date, retained by policy.
APIs and events
Every step of the program is an operation your systems can call and an event they can subscribe to.
Calculate insurance capacity
Per-client, per-bank capacity given records on file.
Calculate allocations
Proposed daily allocation under current policy and constraints.
Approve & execute placement
Dual-controlled approval turning allocations into placements.
Accrue bank interest
Daily accrual runs with per-bank detail.
Credit client interest
Scheduled client crediting with statement detail.
Reconcile & certify
Daily comparisons, exceptions, and period certification.
Allocation simulator
Explore how balances spread across banks under simple assumptions. This is an illustration for understanding the model — it is not an insurance determination, a rate offer, or advice.
Illustration only — not an insurance determination. This simulator assumes the $250,000 standard maximum deposit insurance amount per depositor, per insured bank, per ownership category, reduced by the external deposits and buffer you enter. Actual FDIC coverage of pass-through deposits depends on the FDIC’s recordkeeping and ownership rules, each client’s other deposits at each bank, and facts this page cannot know. Rates are hypothetical inputs, not offers or predictions.
Run custodial cash like a product, not a spreadsheet.
See the four books, the allocation engine, and the daily reconciliation in a working session.