A tonne of CO₂-equivalent is a tonne of CO₂-equivalent — yet in the voluntary market, one credit trades below $10 while another clears above $30. The difference is not chemistry; it is confidence, scarcity and story. Here is the anatomy, in plain language.
1 · Project type sets the neighborhood. Nature-based removals and conservation (REDD+, afforestation, blue carbon) typically command different levels than industrial avoidance (renewable energy, methane capture, cookstoves). Levels move with supply gluts and integrity news cycles — renewable-energy credits, once dominant, de-rated sharply after additionality criticism; blue carbon holds premiums on scarcity and co-benefits.
2 · Vintage is the freshness date. Recent vintages (roughly the last three years) price above older ones — buyers dislike explaining a 2015-vintage retirement in a 2026 sustainability report. The spread between a fresh and a stale vintage of the same project can be substantial.
3 · Co-benefits pay. Credits certified for development impacts beyond carbon — biodiversity, community income, health — attract corporate buyers who need a narrative alongside a number, and price accordingly.
4 · Integrity labels gate demand. The ICVCM's Core Carbon Principles label increasingly functions as a procurement filter: many corporate policies now require CCP-eligible credits or equivalent quality evidence, splitting the market into label-eligible and everything else. (Our CCP guide covers this in depth.)
5 · Traceability and double-counting risk. A credit whose full life — issuance, transfers, retirement — can be checked in a public registry prices above one that requires trust in a spreadsheet. This is precisely why CXF built a public serialized registry for its own units despite being a proprietary platform standard: verifiability is not decoration, it is basis points.
Reading indicative prices honestly. Most published voluntary-market levels — including our own CXF Price Index — are indicative assessments, not exchange-settled prices; the voluntary market trades bilaterally, deal by deal. Our marks are set weekly under a published index methodology: documented bids, offers and counterparty indications, cross-checked against public benchmarks, never revised retroactively. Treat any indicative level as the start of a negotiation, not the end.
Where do waste-oil credits sit in this anatomy? Industrial avoidance economics, full public traceability, fresh vintages by construction (credits follow monthly activity), and a sector story — the circular oil economy — that co-benefit buyers respond to. The current desk marks are on the index, updated every Monday.