Understanding fees on Carbonmark

It is completely free to purchase or retire carbon from a seller listing with USDC.e. You can also create and manage your own listings at zero additional cost.

However, for other types of purchases, you may encounter network fees or payment processing fees from our partner technology providers. This document is intended to help you understand how these fees work, and where the money goes.

Summary - by payment method

Payment MethodNetwork feePayment processing feeGas fee

USDC.e

0-26%*

0%

$0.02 - $0.50**

Credit card

0-26%*

20%

$0.02 - $0.50**

As shown in the table above, when you pay with a credit card, our payment processing partners (Stripe & Offsetra) charge a fee on top of the listed tonne price. This fee is used to facilitate the currency conversions necessary to acquire the carbon asset on Polygon's blockchain network.

*Network fees depend on purchase type (see below)

**Gas fees increase during periods of high network congestion, but are typically only a few cents per transaction. When paying with USDC.e, you pay the gas in MATIC from your wallet. When paying with a credit card, the gas cost is estimated and added to the total.

Summary - by purchase type

Purchase typeTotal network feeDescription

Buy from seller listing

0%

No network fees

Retire from seller listing

0%

No network fees

Buy from BCT pool

25.6%

+25% BCT pool fee for Toucan Protocol +0.6% asset swap fee for SushiSwap

Retire from BCT pool

26.6%

+25% BCT pool fee for Toucan Protocol +0.6% Asset swap fee for SushiSwap +1% Retirement service fee for KlimaDAO

Buy from NCT pool

10.3%

+10% NCT pool fee for Toucan Protocol +0.3% Asset swap fee for SushiSwap

Retire from NCT pool

11.3%

+10% NCT pool fee for Toucan Protocol +0.3% Asset swap fee for SushiSwap +1% Retirement service fee for KlimaDAO

Buy from UBO pool

2.8%

+2.5% UBO pool fee for C3 +0.3% Asset swap fee for SushiSwap

Retire from UBO pool

3.8%

+2.5% UBO pool fee for C3 +0.3% Asset swap fee for SushiSwap +1% Retirement service fee for KlimaDAO

Buy from NBO pool

2.8%

+2.5% NBO pool fee for C3 +0.3% Asset swap fee for SushiSwap

Retire from NBO pool

3.8%

+2.5% NBO pool fee for C3 +0.3% Asset swap fee for SushiSwap +1% Retirement service fee for KlimaDAO

Seller listing prices vs pool prices

Carbonmark compares prices across different sources in the Digital Carbon Market. Currently, we compare prices from two sources: marketplace sellers, and carbon pools.

Marketplace seller listings are the prices set by sellers who have listed a specific asset for sale directly on our platform. There are zero network fees incurred for purchases from marketplace listings.

Carbon pools are similar to 'index funds' for carbon assets. These pools contain a variety of carbon projects and vintages, but each pool has a single price-per-tonne that changes based on supply and demand. In addition to the trading price, purchasing or retiring an asset from a pool may incur a network fee (described in the section above). These pools are not operated by Carbonmark—- currently, we have integrated with the carbon pools operated by C3 and Toucan. You can explore these pools and the carbon assets that they contain at carbon.klimadao.finance.

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