Inbox to Invoice
Creator Deal Desk for Sponsored Revenue

Forward your brand emails. We turn them into clean scopes, safe contracts, and paid invoices.

A done-for-you deal desk + revenue operations layer for creators who already have inbound demand—without hiring a manager or building an internal ops team.

Book a 15-minute call See what we handle

Not a talent agency. We don't source deals—we operationalize and protect the ones you already have.

Sponsored deal flow
BookedClear
NegotiatingIn progress
PendingWaiting
At-riskNeeds attention
Designed to feel futuristic on the front end, and boringly reliable on the back end.

The problem: sponsorship revenue leaks in the backend

When sponsorships grow, the inbox becomes a bottleneck—and money slips through cracks.

  • Pricing is inconsistent (you undercharge or overpromise)
  • Contracts hide risky usage/whitelisting/exclusivity terms
  • Deliverables and approvals drift
  • Invoices get delayed (or ignored)
  • Renewals and follow-ups get missed
  • You lose time, leverage, and predictability

You don't need more deals. You need an operating system behind the deals you already have.

What we handle

We don't source sponsorships. We operationalize and protect the revenue you're already generating.

Deal intake + responses

We capture scope, timelines, and key terms—then draft clear, professional replies.

Scope + pricing guardrails

Package structures, rate consistency, and negotiation support so you stop guessing.

Contract + usage protection

We flag redlines around usage rights, whitelisting, exclusivity, term length, and payment terms.

Deliverable tracking

Deadlines, approvals, and stakeholder nudges so nothing slips through.

Invoicing + collections

Net 30 reminders, late-fee enforcement, and escalation workflows so you get paid.

Pipeline visibility

A weekly snapshot of every deal: booked, negotiating, pending, and at-risk.

How it works

  1. 1Forward brand emails to your dedicated deal desk address.
  2. 2We convert them into a structured deal record + recommended next step.
  3. 3You approve key decisions (pricing/terms), we handle ops execution.
  4. 4You get a simple weekly pipeline snapshot: booked / negotiating / pending / at-risk.

Pricing

Every partnership starts the same way—with us proving ourselves first. No long-term commitment until we've built something together.

Where everyone starts

Starter

12% per deal

No monthly fee. No upfront cost. You only pay when we close.

  • Full deal desk coverage for your first 3 deals
  • Dedicated inbox intake + templated brand responses
  • Pricing guardrails + rate card calibration
  • Contract red-flag review with recommended language
  • Invoicing + Net 30 payment reminders
  • Weekly pipeline snapshot (booked / negotiating / at-risk)

I want every creator I work with to understand how I operate before committing to anything. The Starter plan is our chance to get to know each other, build trust, and prove the value firsthand. After your 3rd deal closes, we'll talk together about moving you to our Core plan. And if the partnership isn't the right fit for either of us—no hard feelings, we part ways clean.

Core

$1,500/mo

For creators with consistent inbound but limited deal volume.

  • Deal desk coverage for up to 3 active deals/month
  • Dedicated inbox intake + templated brand responses
  • Pricing guardrails + rate card calibration
  • Contract red-flag review with recommended language
  • Invoicing + Net 30 payment reminders
  • Weekly pipeline snapshot (booked / negotiating / at-risk)
  • + 8% success fee on collected sponsored revenue
Most common

Growth

$2,500/mo

For creators treating sponsorships as a real business line.

  • Everything in Core, plus coverage for up to 6 concurrent deals
  • Async negotiation support + escalation templates
  • Deliverable + approval tracking with stakeholder nudges
  • Collections workflow (late-fee enforcement + escalations)
  • Renewal prompts + upsell playbooks
  • Biweekly pipeline review call
  • + 6% success fee on collected sponsored revenue

Scale

Custom

For higher volume, multi-stakeholder teams, or multi-brand portfolios.

  • Shared inbox routing + priority SLAs
  • Custom pricing models (bundles, licensing, evergreen retainers)
  • Advanced contract support + vendor/PO management
  • Payment ops: AR reconciliation, multi-entity reporting
  • Custom dashboards + stakeholder communications
  • Optional onsite or launch support

We are an operations service. We do not broker, procure, or "source" sponsorships.

John Casselberry, founder of Inbox to Invoice

About the operator

Meet John Casselberry

John Casselberry built Inbox to Invoice after a decade translating complex medical-technology deals into revenue-ready operations. He has negotiated through value-analysis committees, GPO frameworks, and hospital procurement gauntlets—turning unstructured interest into scoped engagements, guarded terms, and predictable cash flow. That enterprise-grade discipline now powers a creator deal desk that handles intake, pricing guardrails, contract protection, and collections with white-glove partnership at every stage.

Book a call

If you're doing meaningful sponsorship revenue and want the backend to feel like a real business, let's talk. We'll map your current process, identify leakage, and show what we'd take over in week one.

15-minute fit check

No prep required. Bring your current inbox reality.

Book a call
Typical fit: creators with inbound brand demand
Scope: sponsored revenue operations