carbonmark.com valid
Carbonmark
Carbonmark is a global marketplace and API for verified carbon credits. Buyers discover projects, see a live price per tonne, purchase, and retire — with the retirement recorded onchain and provable by serial number. Sellers list credits from supported registries for free. Developers and AI agents can do all of it programmatically over a REST API, an x402 payment endpoint, and an MCP server.
- Authority
- 46 reach 0 · trust 10 · quality 21 · freshness 15
- Tier
- listed
- llms.txt
- https://www.carbonmark.com/llms.txt
- Sections
- 5
- Links
- 29
- Size
- 9113 bytes
- Registered
- 2013-05-04
- Country
- United States Hosting inference
- Hosting country
- United States Hosting inference
- Country evidence
- No published address evidence collected yet
- Categories
- AI and machine learning
- For agents
- Documentation: developer or product docs worth reading, nothing to call
- First seen
- 2026-10-20T23:42:23.653Z
- Last checked
- 2026-10-20T23:44:05.385Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-20T23:43:56.211Z. Cached copy · Source on carbonmark.com
# Carbonmark
> Carbonmark is a global marketplace and API for verified carbon credits. Buyers discover projects, see a live price per tonne, purchase, and retire — with the retirement recorded onchain and provable by serial number. Sellers list credits from supported registries for free. Developers and AI agents can do all of it programmatically over a REST API, an x402 payment endpoint, and an MCP server.
This file is a map of the site for language models and AI search. Every link below is canonical and every claim matches the page it points at.
## What to know
- Carbonmark is a marketplace for verified carbon credits. It is not a broker taking a position, and it does not sell securities, futures, ETFs or any tradable financial exposure to carbon prices.
- A purchase can be retired immediately. Retirement is recorded onchain and produces a public certificate with a serial number that resolves back to the issuing registry.
- Carbonmark is connected to ICR, Puro.earth and EcoRegistry, with further registry integrations ongoing. Listed credits span nature-based, engineered-removal and avoidance project types.
- Prices are per tonne of CO2e and are set by sellers, not by Carbonmark. The live range spans from under $1 to over $100 per tonne.
- Project discovery, live quotes, purchase, retirement and retirement certificates are all available over the API, not only in the web app.
- Both individuals and organisations can buy. There is no minimum purchase: retirement is supported from 0.001 tonnes (1 kg) of CO2e upward, so a single flight or commute can be offset.
## Key pages
- [Carbon credit trading](https://www.carbonmark.com/carbon-credit-trading): The marketplace as a trading venue: buy, hold, sell and retire verified credits. Two ways to transact: retire at checkout by card, bank transfer or USDC with no account funding, or buy and hold with a verified Carbonmark account funded in USDC (through Bridge, a Stripe company, or any wallet). Held credits can be relisted at the holder's price. Live figures on the page: projects available to buy, by type and registry, and the purchasable price range, refreshed every six hours.
- [Buy carbon credits](https://www.carbonmark.com/buy-carbon-credits): How buying works: browse verified projects, see the price per tonne, purchase and retire. Prices range from under $1 to $100+ per tonne depending on project type, vintage and registry.
- [Sell carbon credits](https://www.carbonmark.com/sell-carbon-credits): How suppliers list credits. Listing is free; sellers set their own price. Credits from supported registries only.
- [Carbon markets explained](https://www.carbonmark.com/carbon-markets): Reference page: what carbon markets are, how voluntary and compliance markets differ, who participates, and how a credit is issued, priced, traded and retired.
- [API and integrations](https://www.carbonmark.com/api-and-integrations): REST API for programmatic discovery, live quotes, purchase, retirement and verifiable r
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Machine-readable: GET /v1/resolve?q=carbonmark.com · GET /v1/domain/carbonmark.com · this page as Accept: application/json or text/markdown · MCP lookup_domain
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