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.
Book a 30-minute demo with our team
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.
Start 14-day Pro trial02 | 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 API 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 Pro 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.
Start the Pro trial to get a key straight away. Shipping our data inside a product you sell needs the commercial licence, which comes with Pro, so the trial is still the place to begin.
Commercial Access
For teams shipping carbon data inside their own products.
- API calls
- 50,000 a month once your plan is active. 500 during the trial.
- Rate limit
- 300 calls a minute. 60 during the trial.
- Price
- Free trial 14 days, no card. We size the plan with you on a call, and the commercial licence is included.
Carbon Accountants
For firms reporting emissions on behalf of a client portfolio.
- API calls
- Custom sized to your portfolio.
- Rate limit
- 300 calls a minute.
- Price
- Bespoke falls as your clients disclose via Mycelium. Up to 100% off for qualifying contributors.
Academic Access
For universities and not-for-profit research, with attribution and no commercial use.
- API calls
- 5,000 a month.
- Rate limit
- 120 calls a minute.
- Price
- Free auto-approved for verified .ac.uk and .edu domains, renewable each year.
A real API key in seconds. No card for the trial, and you can stop before it ends.
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.
Browse the full endpoint reference at api.mycelium.global/docs/v1.
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
- Save your searches
- Browse the full database
