Vaulted Deep's $35M turns a carbon offtake into loan collateral

The collateral behind Vaulted Deep's $35 million debt facility, announced Monday, is purchase contracts — long-term commitments to remove carbon dioxide, among them those held by Frontier Climate buyers Google and Stripe — rather than a plant, a patent, or an invoice. Sizing debt against contracted revenue is the oldest move in project finance; what is new is that a carbon-removal offtake now sits on an American lender's collateral schedule, and once the contract is the collateral, the terms inside it — who is obligated, for how much, by what date — decide whether the sector can build.

Vaulted Deep calls the facility “the largest publicly disclosed U.S. commercial debt deal in durable carbon removal to be secured by long-term purchase contracts,” a superlative best read as a statement about structure rather than size, since privately placed deals of this shape never surface in a public tally. The structure is the missing piece. A lender wants a counterparty obligated to pay and an output it can measure. Carbon removal has spent years producing the second while struggling with the first.

Vaulted Deep supplies the measurability. The company, spun out of the industrial waste management firm Advantek, converts food waste, paper sludge, manure, agricultural byproducts, and biosolids into a carbon-dense slurry and injects it into deep disposal wells for permanent storage. Those feedstocks would otherwise break down in landfills, wastewater treatment plants, and manure management facilities, where they release methane. Permanence and physical tonnage are what a credit committee can price; avoided-emissions accounting, which turns on a counterfactual no one can audit, is not. The company says an AI-powered tool helps it find sites and move them through permitting, and that the new financing will push more projects down that pipeline.

Frontier Climate is the demand-side vehicle that made the arithmetic work: its members — Google and Stripe, plus Shopify, Meta, JPMorgan Chase, and, most recently, Anthropic — signed a $58.3 million agreement with Vaulted Deep in 2024 for the removal of 152,480 tons of carbon dioxide on behalf of its buyers between 2024 and 2027. That is a four-year revenue schedule a lender can size against, priced at roughly $382 per ton, and the company says the collateral pool includes other long-term commitments besides Frontier's.

Frontier signed in 2024; the debt arrived in 2026, and only after Vaulted Deep had shown real tonnage — 20,000 tons of removals delivered to Frontier buyers in the first half of 2026, more than it delivered in all of 2025. Lenders financed the proof, not the promise, and that is a higher bar than the carbon-removal sector is accustomed to clearing; an offtake that has not been performed on is an offtake a credit committee cannot underwrite. On the other side of the ledger, the company has raised $48 million in equity and collected $8 million as the second runner-up in the 2025 XPrize Carbon Removal competition.

A developer with a signed offtake and a physical process typically levers that contract harder than this by the time it starts committing capital to sites. Vaulted Deep carries the reverse — $35 million borrowed against $48 million raised — which is what a new collateral class looks like while lenders are still calibrating how much of a purchase contract they will lend against. Chief executive Julia Reichelstein said waste operators need new options as traditional disposal routes tighten, and that the financing lets the company take on more projects. The company's ability to borrow from “mainstream lenders,” as it puts it, is the claim under test, and the answer so far is: some, at this size.

The test arrives in delivered tons. Against 152,480 tons contracted across 2024 through 2027, a 20,000-ton half-year leaves a schedule that has to steepen sharply next year, and performance is exactly where a facility secured by a purchase contract is most exposed. Debt against an offtake is debt against a promise to perform; the covenants that matter will be tied to tonnage, verification, and the calendar. Watch which lender holds the paper and how the milestones are drafted, because that drafting is the template the next carbon-removal developer will borrow against.

This publication has argued that corporate buyers now negotiate carbon offtakes like any other supply contract, and that lenders will finance only the ones that allocate risk like debt. Vaulted Deep's facility is what that argument looks like in a loan book. Frontier's stated theory of change — that commitments demonstrating robust demand will pull in the capital required to build — gets a test here, and a Frontier spokesperson describes the financing as a great example of the theory in practice. The theory holds under three conditions this deal happens to satisfy: a firm buyer obligation, real counterparty credit, and an output someone can measure. Strip any one of them and the same structure stops clearing credit.

The template is already familiar from adjacent corners of transition finance. Stegra's green steel is financed by certificates that let corporate buyers pay early for an attribute not yet produced, and Symbiosis sells CFOs on a nature-based removal book whose real innovation is how the risk is allocated. What Vaulted Deep adds is a contract that has moved off the equity pitch and onto the debt schedule.

Whether it travels is a question for the next facility. If a second lender underwrites a second purchase contract at a larger size, the offtake has become an asset class, and developers holding firm, well-drafted agreements will find capital waiting on the other side of the diligence. If the market goes quiet, $35 million stays a single data point, and lenders will go on treating unbacked tonnage as unbankable.