Briefs in Notion, per client. Time-tracking in Harvest. Creator commissions in spreadsheets. Retainer fees in QuickBooks. Reconciliations on Friday afternoon. Mix-IP holds the agency end-to-end — every client, every brief, every creator, every reconciliation, every retainer renewal — on the same record. Built for agencies that run twelve simultaneous worlds and need them all addressable from one workspace.
Bundled on every plan: Vault 88 for per-client KMS isolation · Pro Transfer App desktop transfer for masters across every client engagement · Wise + Stripe rails for creator settlements in 60+ currencies.
Briefs in Notion, per client. Time-tracking in Harvest. Creator commissions in spreadsheets. Retainer fees in QuickBooks. Where's the original creator invoice? in a Slack thread the AD can't find. Mark-ups reconciled in a CFO model nobody touches between Tuesday and the close of the quarter. Mix-IP holds the agency end-to-end — every client, every brief, every creator, every commission, every reconciliation, every retainer renewal — on the same record, so the account director sees the portfolio from one view and the agency margin reports on Monday morning, not the following Friday.
One agency, three engagements, five steps. A typical week at Mainline Agency — Reka Imrei (Creative Director) and Kai Patel (Account Director) carry three concurrent clients at three different lifecycle stages: Aurora Athletic mid-flight on Spring ’26 cutdowns, Mariana Cosmetics just won for a Q3 launch, Ferro Energy up for retainer renewal in 60 days. No per-client Notion proliferation. No "where's the original invoice?" on Friday afternoon. Each step below cross-links to the feature page that does the work.
Mainline pitches Mariana Cosmetics for a Q3 product launch — strategy deck, creative proposal, rate card, retainer-conversion option — all attached to the workspace. Sebastian Tan signs on Mariana's side. The engagement workspace opens with read-access for Mariana's brand team, the engagement contract auto-files into Vault 88, and the rate card converts into the working budget without a re-key.
Reka and Kai allocate across all three engagements at once: Aurora's Spring ’26 cutdowns + new social variations, Mariana's Q3 launch package, Ferro's monthly retainer creative. The in-house team picks up what fits inside the agency; the rest gets commissioned out — an editor in São Paulo, a colorist in Berlin, a sound designer in Mexico City. Every brief, every commission, every fee on the engagement record. The creative director's roster floats across all three clients without three separate trackers.
All three engagements run in parallel: Aurora's cutdowns through review, Mariana's launch through first-cut sign-off, Ferro's retainer creative through monthly delivery. Each client sees only their own work via per-tenant Vault 88 shares — KMS-isolated per client, watermarked per recipient, NDA at the door, time-windowed to the review meeting. The agency view shows all three threads at once. The clients never accidentally see each other's work.
Three client invoices go out: Aurora project fee + mark-up, Mariana project fee + retainer setup, Ferro monthly retainer + scope-creep change-order. Three creator settlements flow through: São Paulo editor in BRL, Berlin colorist in EUR, Mexico City sound designer in MXN — all routed through Wise + Stripe, all reconciled against the engagement record. Mark-ups settle into Mainline's agency margin report. Tax forms generate per recipient at year-end. No re-keys, no separate rail logins, no FX-reconciliation Tuesday.
Ferro's retainer comes up for renewal in 60 days; the workspace flags the window 90 days out alongside the original engagement terms. Aurora's brand director rotates and the new BD reopens the work-product retention clause — Mainline surfaces the signed boundaries inside four hours, case-study rights intact (Mainline's strategy and creative process docs are KMS-isolated under the agency's tenant; the masters Aurora owns sit on Aurora's). The Mariana relationship moves from project to retainer mid-engagement after the launch lands. Client divorce doesn't take agency IP.
Mix-IP consolidates the multi-client coordination layer of the agency — the briefs across clients, the creator commissions, the pass-through margin, the retainer renewals, the work-product retention. We don't replace the tools your designers and editors actually love. Adobe Creative Cloud stays. Your NLE and motion stack stays. Your accounting tool stays. Your client's procurement workflow stays. We just stop the agency from leaking out the seams between them.
Three agencies that ran their multi-client portfolios end-to-end through Mix-IP. Concurrent client counts, work-product retention horizons, and creator-settlement currencies from real engagement workflows.
Mainline Agency — Q3 client portfolio
All four engagements ran in parallel without a Friday-afternoon reconciliation. Agency margin reported on Monday morning, not the following Friday.
Counterpane Agency — Aurora retainer
When Aurora's brand director rotated and the new BD reopened the work-product retention clause, the agency surfaced the original signed boundaries inside 4 hours. Case-study rights upheld without a legal escalation.
Lattice Creative — global commissions
Mexico City sound designer paid in MXN. São Paulo editor paid in BRL. Berlin colorist paid in EUR. All three settled in the same Friday batch — no separate rail logins, no FX-reconciliation Tuesday.
All three agencies are illustrative composites pending Jonathan-redlined customer stories and a legal pass on the fictional names.
Agencies running multi-client portfolios — with creator commissions, work-product retention, mark-up pass-through, and per-client Vault shares — need more than a shared drive and a CFO spreadsheet. Mix-IP ships the controls client procurement, legal, and IT actually verify before they sign a master services agreement — and the controls the agency itself relies on to keep its own IP separate from each client's.
SOC 2 In progress
Type II audit underway with a Big-Four-aligned firm. Trust services criteria: security, availability, confidentiality. Report expected H2 2026.
Per-tenant encryption keys Enterprise
Your KMS, your key, your control plane. Agency work-product (strategy docs, creative process, case-study rights, retainer-protected creative deliverables) is encrypted under your tenant's key. Client engagements are KMS-isolated per-client. Client divorce doesn't take agency IP — even if a client moves to a competing agency, your work-product stays encrypted under your KMS; they don't get the keys.
DPA-ready Live
GDPR-compliant Data Processing Addendum signed at workspace creation. Standard Contractual Clauses for cross-border transfers (the EU creator commissioned by the AMER agency for the APAC client). EU data residency on request.
On-chain provenance Live
Every IPR registration anchors a SHA-256 hash on-chain. Provenance proves work-product authorship through the agency, not just through the client — useful when a competing agency claims similar creative, the chain proves your team got there first.
SOC 2 status reflects current audit progress. Confirm with sales before referencing in formal procurement responses.
Agencies
Hold every client. Hold every creator. Hold the agency — and the agency margin — across all of them.
Includes Vault 88 for per-client KMS isolation · Pro Transfer App for masters across every client engagement · Wise + Stripe rails for creator settlements in 60+ currencies.