§45Z — SAF and clean fuels, tokenized per gallon
$1.75/gal for SAF and $1.00/gal for other transportation fuels, scaled by lifecycle carbon intensity. The single biggest credit per unit shipped — and the most production-data-intensive to verify.
The trade
§45Z replaced the old §40A/§40B fuel-specific credits with a single lifecycle-CI-based formula. SAF gets a 75% bonus ($1.75/gal at the top of the curve); renewable diesel and biodiesel get the base $1.00/gal.
Tokenization happens at the fuel-meter event. CI scoring uses the EPA CORSIA-eligibility framework for SAF and the §45Z standard model for other fuels.
OTC Desk
liveBilateral, wire-settled (or stablecoin at buyer's election). No tokenization required. Every IRA credit transaction we've closed to date has happened this way — the proven path.
About the OTC DeskOn-chain marketplace
testnetCredit tokenized as XCT at production. Marketplace bid book; atomic swap for MXD; transfer election booked on-chain. Continuous price discovery, faster settlement.
About §6418 transferabilityMechanics
| Fuel type | Base rate | CI scaling | Top rate |
|---|---|---|---|
| SAF | $1.75/gal | CI ≤ 50 kgCO₂e/MMBtu | $1.75/gal |
| Other transport | $1.00/gal | CI ≤ 50 kgCO₂e/MMBtu | $1.00/gal |
- Production verification: fuel meter SCADA feed
- CI scoring: EPA CORSIA framework (SAF) or §45Z model (other)
- PWA multiplier: 5x on base rate
- Window: 2025–2027 production
Trust
- CI calculation methodology hash recorded per mint
- Feedstock provenance attestation via Asset Validator
- §6418 transferability pre-elected
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