Buy SRC-20

For: a trader with a supported wallet. Goal: own an amount of an SRC-20 token, having paid a known total. Chain and network: Bitcoin mainnet. Version: continuous, verify with GET /api/version.

Safety: your BTC leaves your wallet before the tokens arrive, and sits in a StampDEX-controlled escrow in between. Read Where your funds are first. It is the single most important thing to understand about buying here.

Prerequisites

• A supported wallet that can sign a Bitcoin payment here. Universe Wallet and UniSat are the two where buying has been run end to end.
• Enough BTC for the trade total, the 1.5% buyer service fee with its 500 sat minimum, and the network fee. See Fees.
• The token’s identity, not just its ticker. See Asset identity.

Steps

1. Open the token page. From the market board, or directly at stampdex.fun/trade/src20/<ticker>/<deploy transaction>. Confirm the deployment transaction and block match the token you researched.
2. Pick a listing. The book shows real signed listings with amount, unit price in sats per token, and total. Unit price times amount always equals the total.
3. Review the trade. Before your wallet opens, StampDEX shows the token, the amount, the unit price, the total, the service fee, the network fee rate, and the payment address. The same panel states that your BTC goes to a trade address StampDEX controls and is released to the seller only when the tokens reach you. That line is on the buy panel whether or not you use the review step, so quick trade does not hide it.
4. Sign in your wallet. Your wallet displays the same transaction. Check it against the review panel. See Review a PSBT before signing. If the numbers differ, refuse and report it.
5. Wait. Your payment confirms, the token balance is verified against the index, and the settlement worker delivers the tokens. The order page names each state and each transaction id.

Expected result

The order reaches Filled. You hold the tokens, the seller holds the total minus their service fee, and the service fee appears as its own output in the settlement transaction.

How to verify

• Open your portfolio and check the balance.

• Read the order over the API:

  curl "https://stamp.api.bitcoinuniverse.io/api/v1/orders/ORDER_ID"

• Take the transaction ids from the order page to any block explorer.

Common failure states

You see	What happened	What to do
“This item is currently being purchased by another buyer”	Another buyer locked it first	Pick another listing. Your funds never moved
“Purchase session expired”	Your buyer lock passed its 30 minute life	Start again. Nothing moved
“Listing is no longer valid: seller collateral UTXO has been spent”	The seller spent the output backing the listing	The listing is removed automatically. Pick another
“The seller no longer holds …”	The seller moved the tokens	The listing is removed automatically. Nothing of yours moved
“Could not verify the seller collateral right now”	The index is unreachable. Different from the listing being invalid	Wait a few minutes and retry
The order sits in Awaiting transfer	Bitcoin confirmation times vary with the fee rate	Watch the confirmations. Nothing more is needed from you
The order shows Failed	The payment confirmed but the expected token balance was not verified within the grace period	Your BTC is in the listing escrow. See Recovery

Recovery path

Nothing here needs you to send a second payment. Repeating a payment confirmation with the same transaction id is safe: it returns the answer already recorded rather than paying twice. A Failed order holds your BTC in a named escrow address until an operator completes or returns it. See Recovery.

Related

• Where your funds are
• Order lifecycle
• Fees
• Orders endpoints