Fees

Every fee is stated before you sign. There are no hidden fees. There is one fee that surprises people, and it is in the second table.

SRC-20 marketplace trades

Fee	Amount	Who pays
Service fee	1.5% of the trade total, with a 500 sat minimum, per side	The buyer pays one, the seller pays one
Network fee	Set by the fee rate you choose, in sat/vB	Whoever signs the transaction that pays it

Both sides pay, so a trade carries 3% in total. The seller’s side is deducted from their payment; the buyer’s side is funded by the extra sats the buyer sends. The two fees are paid together as a single output in the settlement transaction.

The minimum dominates on small trades

The 500 sat floor is per side, and the smallest trade StampDEX will list is 2,000 sats.

Trade total	Buyer fee	Seller fee	Total fee	As a share of the trade
2,000 sats	500	500	1,000	50%
20,000 sats	500	500	1,000	5%
33,334 sats	500	500	1,000	3%
100,000 sats	1,500	1,500	3,000	3%
460,000 sats	6,900	6,900	13,800	3%

Above roughly 33,334 sats the percentage takes over and the all-in cost settles at 3%. Below it, the floor is what you are paying. This is arithmetic, not a penalty, but it is worth knowing before you list something small.

SRC-20 mint, deploy, and transfer

Every SRC-20 transaction StampDEX builds outside the marketplace, a mint, a deploy, or a plain transfer, carries a flat 1,500 sat platform fee, the same fee the Universe Inscribe app charges. It appears as its own output in the transaction your wallet shows.

Bitcoin Stamps

No StampDEX fee. A stamp purchase pays the dispenser’s asking rate and the Bitcoin network fee. Opening and closing a dispenser pays only the network fee.

Where the service fee goes

To a single fixed pay-to-Taproot output:

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It is a constant, not a per-user address, and it is visible on chain in every SRC-20 settlement and in every deploy, mint, or transfer StampDEX builds. Check it in the transaction your wallet shows you. See Review a PSBT before signing.

Network fees

Bitcoin transactions pay miners by size, not by value.

curl https://stamp.api.bitcoinuniverse.io/api/v1/market/fees

You get five tiers: fastest, half hour, hour, economy, and minimum. If any tier is missing or is not a number, the whole response is rejected with an error rather than served partially.

• The estimate is cached for about 60 seconds.
• If you do not choose a rate, the half hour tier is used, falling back to 25 sat/vB when no estimate is available.
• Your chosen rate is applied when you buy, so a seller’s listing-time rate is not imposed on you.
• Nobody can guarantee a confirmation time. The rate buys a position in a queue, not a promise.

Dust outputs are not fees

An SRC-20 transaction carries several tiny outputs that are protocol structure, not charges:

Output	Value	Goes to
Recipient marker	330 sats	The buyer, as the output the transfer credits
Data chunk	330 sats each	The encoded transfer itself
Seller anchor	548 sats	The seller, returned

None of them go to StampDEX.

Browsing is free

Exploring markets, stamps, collections, and the public API costs nothing and needs no wallet.

Related

• Buy SRC-20
• Sell SRC-20
• Review a PSBT before signing