A white electrical cord with an attached white plug and a broken power adapter in the middle, against a black background.

Mycelium’s open-access carbon database, in one neat little API

Mycelium logo with stylized mushroom icon and company name.

Mycelium Core enables businesses, carbon accountants and academics to seamlessly connect to our database via API and utilise our emissions data within their own products.

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01
FAIR PRICING

Power to the little guys

We price API usage based on supplier spend and volume of API calls, making our data accessible even to the smallest operators.

Why do we do this? Because sustainability data shouldn’t be reserved for the largest corporates. We offer pricing for individuals too, so even one-person carbon accountants can access the world’s sustainability data.

02
CARBON ACCOUNTANTS

Build the ecosystem with us and reduce your API spend

Report on behalf of your clients to help grow the open sustainability dataset, and receive discounted API access, up to full free use.

Why do we do this? Because sustainability data shouldn’t be reserved for the largest corporates. We offer pricing for individuals too, so even one-person carbon accountants can access the world’s sustainability data.

03
SIGN UP

Sign up is simple

Signing up is simple, and you can explore our API documentation to get started straight away with a preview key

To find out how Mycelium’s open access database is changing the face of sustainability data in the UK sign up now get started on our free tier. Of if you prefer book a demo for a deeper dive.

04
ACCESS TIERS

Which API access suits you best?

We provide different levels of API access depending on your use case, from initial evaluation through to academic research and commercial integration.

  • Designed for evaluation and early exploration.

    • Access to a snapshot of the dataset (~5,000 companies)

    • API and CSV formats available

    • Non-commercial use only

    • Suitable for testing, prototyping, and research

    Ideal if you want to understand the structure, coverage, and potential of the dataset before committing to a licence.

Non-Commercial Use Only

This licence governs evaluation access to Mycelium’s API and dataset.

Read the Preview API Licence

Read our Privacy Policy

  • For businesses integrating Mycelium data into operations, products, or services.

    • Full dataset access via API

    • Use in commercial tools, platforms, and decision-making

    • Scalable pricing based on usage and organisation size

    • Support for integration and production use

    Ideal for procurement teams, platforms, and organisations embedding emissions data into workflows.

Licensed Use Required

This licence governs the use of Mycelium’s dataset within commercial products, services, and operational systems.

Commercial use includes integration into platforms, internal tools, or client-facing applications and requires an appropriate licence agreement.

Read the Commercial API Licence

Read our Privacy Policy

  • Special access for firms working directly with company emissions data.

    • Free or low-cost access for small portfolios (0–10 companies)

    • Scaled pricing for larger portfolios

    • Reduced or free access for contributors submitting verified data

    • Designed to support reporting, benchmarking, and client work

    Built to support carbon accountants while improving the overall dataset through contribution.

API Access for Carbon Accountants

Designed for organisations working directly with company emissions data across reporting, benchmarking, and advisory workflows.

Access may be free or reduced based on portfolio size and clients choosing to disclose via Mycelium, with commercial terms applied where applicable.

Read the Carbon Accountant API Licence

Read our Privacy Policy

  • For universities, researchers, and non-profit organisations.

    • Full or extended dataset access (subject to approval)

    • Permitted for non-commercial research and publication

    • Attribution required in published work

    • Ongoing access for approved research projects

Non-Commercial Research Use

This licence governs access to Mycelium’s dataset for academic, institutional, and non-profit research purposes.

Data may be used for analysis, modelling, and publication, provided appropriate attribution is given and no commercial use is made.

Read the Academic API Licence

Read our Privacy Policy

05
ABOUT OUR DATA

What the Mycelium API Provides

  • Company-level emissions data across thousands of organisations

  • Structured carbon data for analysis, benchmarking, and reporting

  • Access via API and downloadable formats

  • Continuously expanding global dataset

06
BUILT FOR SCALE

Company Emissions Data API

The Mycelium API delivers company-level emissions data in a consistent, machine-readable format, enabling organisations to analyse carbon performance, benchmark across industries, and integrate emissions data directly into operational systems.

07 | CONTACT

Let’s build what the world needs, today

If you’re interested in working together to solve the greatest challenge the world faces, get in touch.

crew@mycelium.global

Sign up for BETA access

Our Beta open-access emissions platform is now live with 15,483 UK companies’ carbon emissions.

Join BETA