Reviewed August 2026 against GOV.UK’s carbon-trading guidance, USDA’s Farm Service Agency, and the Woodland Carbon Code price index.

Try it: Carbon Credit Payout Estimator (US & UK) →

Carbon Credits for Farmers: USA & UK Prices, APIs Compared

By Farmonaut Research & Content Team · Published 30 September 2025 · Updated 16 October 2026

Carbon credits for farmers in the USA mostly flow through private developers — Indigo Ag, Agreena, Truterra, and Boomitra — that register projects with Verra, the American Carbon Registry, or Climate Action Reserve’s Soil Enrichment Protocol, alongside USDA cost-share programs like the Conservation Reserve Program (CRP) that pay for adopting a practice rather than for a verified tonne. A carbon credit for farmers in the UK works differently: two government-recognized standards, the Woodland Carbon Code and the Peatland Code, set the terms, and their 2025 average unit prices were £28.32 and £39.57 per tonne of CO2e. A carbon credit API is the software layer — built by registries such as Verra and Puro.earth, or by farm-data platforms such as Farmonaut — that turns satellite imagery and field records into the standardized measurement, reporting, and verification (MRV) data both systems require before a credit can be issued. The rest of this guide breaks down what each route actually pays, who can access it, and how the API layer connects the two.

Table of Contents

• How Big Is the Carbon Credit Opportunity for Farmers?
• US vs UK Carbon Credit Options for Farmers, Compared
• Carbon Credits for Farmers in the USA
• Carbon Credits for Farmers in the UK
• Estimate Your Own Carbon Credit Payout
• How to Buy Carbon Credits in the UK
• Carbon Credit APIs: What They Actually Do
• Market Volatility and Liquidity: What the Data Shows
• Farmonaut’s Carbon-Focused Tools for Farmers
• Frequently Asked Questions
• Conclusion
• Try it: Carbon Credit Payout Estimator (US & UK)

How Big Is the Carbon Credit Opportunity for Farmers?

Agriculture generated 9.4% of total U.S. greenhouse gas emissions in 2022, the most recent year covered in the EPA’s official inventory (the agency’s Agriculture Sector Emissions page shows a last-updated date of 10 March 2026) — which is exactly why corporate buyers keep looking to farmland for offsets. Because the inventory is republished on roughly an annual cycle, check EPA’s Agriculture Sector Emissions page directly for the next update rather than treating 2022 as a permanent figure.

The dollars back up the demand. Global Market Insights valued the voluntary agriculture carbon-credit market at $36.1 million in 2024, an estimated $53.8 million in 2025, and forecasts $648.3 million by 2034 — a 31.9% compound annual growth rate for the 2025–2034 period. Five companies (Indigo Ag, Agreena, Agoro Carbon Alliance, Boomitra, and GreenCollar) held a combined 35% of that market in 2024, with Indigo Ag alone above 9%. Since the 2034 figure is a forecast, not a completed year, check Global Market Insights’ report page for any revision before relying on it.

For a broader look at how carbon credits work for farmers outside the two systems covered here, see our related guide on carbon credits for farmers.

US vs UK Carbon Credit Options for Farmers, Compared

An AI summary can tell you that carbon credits pay farmers for sustainable practices. It can’t tell you which of seven very different mechanisms actually applies to your land, or which ones are payments rather than tradable tonnes. This table separates them:

Note: UK prices are 2025 averages reported by the Woodland Carbon Code and the IUCN UK Peatland Programme; both are revised annually, so check the linked sources for the current figure before signing a contract.

Carbon Credits for Farmers in the USA

USDA Programs: Payments, Not Per-Tonne Credits

The Conservation Reserve Program is the largest land-retirement program USDA runs, and it is the one most “carbon credit for farmers usa” searches eventually land on — even though CRP pays a rental and cost-share rate for taking land out of production, not a price per verified tonne of CO2e. USDA’s Farm Service Agency reported roughly 25.8 million acres enrolled nationally as of its 17 September 2025 announcement, the program’s 40th anniversary signup cycle. A separate FSA release on 7 July 2026 confirmed 2.2 million acres accepted into the 2026 signup, against a national CRP acreage cap of 27 million acres for fiscal year 2026. For historical scale, the U.S. Government Accountability Office reported 22.9 million acres enrolled and $1.8 billion in rental payments for fiscal year 2023, in a report published 25 September 2024. Because CRP contracts expire and re-enroll on rolling multi-year cycles, the FSA’s own statistics pages are the only reliable place to get a live enrolled-acres figure rather than any fixed number quoted here.

Private Marketplaces and Registries

Outside USDA, most American farmers who sell verified soil-carbon tonnes go through a private aggregator that pools contracts across many farms and issues credits under a recognized methodology. Indigo Ag, Agreena, Agoro Carbon Alliance, Boomitra, and GreenCollar are the five largest by market share, per the Global Market Insights figures above. On the registry side, Climate Action Reserve is a nonprofit that registers — but does not itself sell — credits, and it runs agriculture-specific methodologies including the U.S. Soil Enrichment Protocol, Nitrogen Management, Rice Cultivation, and Grassland protocols. Unlike the UK’s two land-based codes, none of these U.S. registries publish a single average price per tonne; instead, each lists individual projects and transactions in its public registry, so the way to get a current number for your own acreage is to check the live listings rather than rely on a blended average from any one report.

Carbon Credits for Farmers in the UK

Woodland Carbon Code

The Woodland Carbon Code is the UK’s government-recognized standard for woodland-creation credits, tracked through the UK Land Carbon Registry and managed by Scottish Forestry on behalf of the Forestry Commission, Welsh Government, and the Northern Ireland Forest Service. Its average Pending Issuance Unit price has moved from £11.01 in 2020, to £15.41 in 2021, £19.27 in 2022, £24.24 in 2023, £26.85 in 2024, and £28.32 in 2025 — data published on the Woodland Carbon Code’s own pricing page, dated 20 March 2025. Farmers and landowners managing a Woodland Carbon Code project can track planting, forest health, and performance with Farmonaut’s Forest Advisory Tech.

Peatland Code

The Peatland Code rewards rewetting and restoring degraded peatland, administered through the IUCN UK Peatland Programme. Its average Pending Issuance Unit price rose from £25.04 in 2024 to £39.57 in 2025, according to the programme’s UK Carbon Price Index article published 4 August 2026 — though the article itself flags that the 2025 average was skewed upward by three large transactions, so the median deal likely priced lower than the mean. There are not yet enough reported sales to publish an average price for verified Peatland Carbon Units, as opposed to pre-verification Pending Issuance Units (UK carbon prices).

Woodland Carbon Guarantee: Selling Directly to Government

Landowners who register a Woodland Carbon Code project in England can also bid into the Woodland Carbon Guarantee, a £50 million Forestry Commission scheme that buys Woodland Carbon Units at a guaranteed, inflation-protected price through contracts running to 2055 or 2056. The seventh auction set a reserve price of £30 per unit; the eighth auction, announced 10 April 2024, made £20 million available and kept a £30 reserve price for grant-supported projects (Forestry Commission). This is one of the few carbon-credit mechanisms anywhere that fixes a government-guaranteed floor price decades into the future, which is worth knowing before comparing it against a shorter, market-priced voluntary contract.

Sustainable Farming Incentive: Related, But Not a Carbon Credit

Defra’s Sustainable Farming Incentive (SFI26) is a separate scheme that pays farmers per hectare for specific land-management actions — it is not a carbon-credit sale, and it does not appear in either the Woodland Carbon Code or Peatland Code registries. SFI26 reopens for smaller farms and those without an existing Environmental Land Management agreement in a first application window starting June 2026, with a second, general window in September 2026. Farmers evaluating both routes should treat SFI payments and carbon-credit sales as two distinct income lines with different eligibility rules, not interchangeable options.

Carbon farming in Australia: how ACCUs work for farmers

Australian farmers earn Australian Carbon Credit Units (ACCUs), one per tonne of CO2-e stored or avoided, by registering a project under an approved method with the Clean Energy Regulator (CER).

• Price. The generic ACCU spot price was A$36.28 at the end of March 2026, down slightly from A$36.60 at the end of 2025, and rose to A$37.50 on 15 May 2026 (CER Quarterly Carbon Market Report, March quarter 2026).
• Volume. A record 5.5 million ACCUs were issued in the first quarter of 2026, and CER expects 22–26 million for the year (same report).
• Soil carbon method. Farm soil projects use the 2021 method for estimating soil organic carbon sequestration using measurement and models (CER).
• Permanence. Projects choose a 25-year or 100-year permanence period. A 25-year period cuts issued ACCUs by 20%, and all sequestration projects lose a further 5% to a risk-of-reversal buffer, so 10,000 tonnes of abatement on a 25-year project earns 7,500 ACCUs (CER permanence obligations).

The permanence choice is a land-use commitment. Carbon stored must be maintained for the whole period, which limits future changes to how the land is farmed.

Estimate Your Own Carbon Credit Payout

Plug in your own acreage, sequestration rate, and a price per tonne from the table above to see an estimated annual payout before fees.

Assumptions: this is a simple area × rate × price multiplication. It excludes verification costs, registry fees, broker commissions, buffer-pool deductions common to forestry and peatland projects, and multi-year contract discounting. Sequestration rates differ by practice, soil type, and baseline — use a rate from your own soil test, agronomist, or project developer, not a default.

How to Buy Carbon Credits in the UK

"Buy carbon credits UK" and "how to buy carbon credits UK" are buyer-side searches — usually a business looking to offset, not a farmer looking to sell. Both UK codes work the same way: there is no central exchange with a posted price. Per the IUCN UK Peatland Programme's own buying-and-selling guidance, a price is negotiated directly between the project owner and the buyer, with the Peatland Code itself taking no part in the transaction. The concrete steps, drawn from GOV.UK's Woodland Carbon Code guidance and the IUCN Peatland Programme's buyer page, are:

1. Choose a standard. Woodland Carbon Code units come from new woodland creation; Peatland Code units come from peatland restoration.
2. Find a project. Search the UK Land Carbon Registry, or go through a project developer or retail aggregator who sells units on developers' behalf.
3. Pick a unit type. A Pending Issuance Unit (PIU) is a promise of future delivery before verification; a Woodland Carbon Unit or Peatland Carbon Unit (PCU) is fully verified. PIUs trade at a discount to reflect delivery risk.
4. Negotiate and contract. Price is agreed bilaterally. For a PIU, GOV.UK and the IUCN guidance both note that the sale contract must state who carries the risk if the unit is never verified.
5. Register the transfer. Ownership changes are recorded in the UK Land Carbon Registry, which anyone can view without an account; only transacting requires one.

There is no minimum purchase requiring a company structure — the registry itself does not state that individuals are barred from buying — but in practice, most sales happen through retail aggregators built for corporate offset budgets rather than one-off personal purchases.

Carbon Credit APIs: What They Actually Do

A carbon credit API doesn't create or sell a credit. It is the data pipe that carries field and satellite evidence — vegetation indices, soil sampling results, IoT sensor readings — into the format a registry needs to validate a project and issue a unit. Three real examples show the range: Verra runs a public project API that requires no API key or login; Puro.earth's Puro Connect and MyPuro 2.0 tools handle credit onboarding, trade reporting, and retirement inside the Puro Registry; and Climate Action Reserve maintains a public project registry covering its Soil Enrichment, Nitrogen Management, Rice Cultivation, and Grassland protocols. Farmonaut's own Carbon Credit API sits on the farm-data side of that pipe, converting satellite monitoring into the standardized evidence these registries expect; technical specifications are in the API Developer Docs. Blockchain-based traceability, covered on our product traceability page, adds an audit trail so a buyer can trace a purchased tonne back to the field action that generated it.

Best API for Emissions Tracking in Agriculture: A Checklist

"Best" depends on your registry and your land, not on a single winner — so use these five checks on any candidate, including ours:

• Registry compatibility. Does it push data in a format Verra, Gold Standard, the Woodland Carbon Code, the Peatland Code, ACR, or CAR will actually accept?
• Measurement source. Is the underlying evidence satellite imagery (NDVI, SAR), physical soil sampling, IoT sensors, or self-reported logs? Each has a different audit trail.
• Unit conventions. Can it handle both US acre-based and UK/EU hectare-based reporting without manual conversion?
• Pricing model. Per-hectare/acre, per-API-call, or bundled subscription — check which matches your farm's scale before committing.
• Data portability. Can you export raw MRV data for an independent third-party auditor, rather than being locked into one verifier's dashboard?

Market Volatility and Liquidity: What the Data Shows

Rising average prices can mask a shrinking, thinner market — and the UK's 2025 data shows exactly that. Woodland Carbon Code unit sales fell to 173,722 in 2025 from 277,815 in 2024, while Peatland Code unit sales fell to 28,679 from 187,291 over the same period, per the IUCN UK Peatland Programme's 4 August 2026 report. At the same time, average prices rose in both codes. Read together, that combination points to fewer, larger, higher-priced deals rather than a broadening market — a liquidity signal a single "average price" headline won't show you, and a real factor in deciding whether to sell into a thin market now or wait for a fuller one.

Farmonaut's Carbon-Focused Tools for Farmers

Whichever program you're pursuing, verification runs on farm data. Farmonaut's subscription tools put satellite monitoring, AI advisory, and blockchain traceability behind that data:

• Fleet & Resource Management: Real-time satellite and IoT integration to cut logistics-related emissions. Read more about Fleet Management Solutions
• Loan and Insurance Verification: Satellite-backed field data to speed up climate-aligned financing decisions. Explore Crop Loan and Insurance Verification
• Large-Scale Farm Management: Dashboards and compliance tools across every parcel, built for the reporting cadence carbon-credit verification demands. Check the Agro-Admin App
• Carbon Footprint Tracking: Our own MRV starting point before you approach any registry. Carbon Footprinting Toolkit

Carbon-credit-linked practices are spreading well beyond row crops and woodland into perennial and agroforestry systems; for a look at that trend in another commodity:

Frequently Asked Questions

Conclusion: Two Markets, One Verification Problem

US and UK farmers are answering the same underlying question — can you prove a tonne of carbon was actually sequestered or avoided — through different institutions. The USA runs on private aggregators and registries layered over USDA land-retirement payments; the UK runs on two government-recognized codes with a public price index and a direct government buyer of last resort in the Woodland Carbon Guarantee. In both systems, the carbon credit API is what makes the proof cheap enough to bother filing: satellite and field data, standardized, and pushed into whichever registry your market requires.

Start with the Carbon Footprinting Toolkit to establish your baseline, or go straight to the Carbon Credit API if you already know which registry you're targeting.