Mycelium's open-access carbon database, in one neat little API
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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Tell us a little about yourself, and we'll get you on a call with Tom to walk through what the Mycelium API can do for you.
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.
Try Pro free for 14 days02 | The Carbon Accountant Coalition
The world's emissions data won't free itself.
Most corporate carbon data is locked inside reports, spreadsheets and consultancy decks that nobody outside that one engagement ever sees. Carbon accountants are the people who can break that open.
Partner with us: report on behalf of your clients into Mycelium's open dataset, and the more you contribute, the less you pay for the API. Big enough pipeline and it goes to zero. Every disclosure you publish makes the picture sharper for the next 10,000 teams trying to decarbonise.
Up to 100% off API costs for qualifying contributors.
Join the coalition03 | Sign Up
Sign up is simple
Signing up is simple. Start your 14-day Pro free trial to get a real API key in seconds and explore the full reference.
To find out how Mycelium's open-access database is changing the face of sustainability data, sign up now to start your trial. Or if you'd prefer, book a demo for a deeper dive.
Start 14-day free trial04 | 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.
Commercial Access
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
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
Academic Access
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.
Become a member
Sign up free to shape the emissions data shown about your company and keep tabs on the ones you care about.
- Claim your company profile
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- Browse the full database
