# Buying & Selling

Buy coins and packs with a credit card or cryptocurrency. Payments are converted to USDC on Base and settled on-chain.

## How Buying Works

```mermaid
sequenceDiagram
    participant You as Buyer
    participant Numex
    participant Payment as Payment Processing
    participant Chain as Base (On-Chain)

    You->>Numex: Click "Buy now"
    Numex->>You: Checkout (enter card or pay with crypto)
    You->>Payment: Complete payment
    Payment->>Chain: USDC sent to settlement
    Chain->>Chain: Coin transferred to your wallet
    Chain->>Chain: Seller paid, curator residual accrued
    Chain-->>Numex: Confirmed
    Numex-->>You: Coin appears in your portfolio
```

1. Find a coin on the marketplace or a pack in the vault
2. Click **Buy now** and complete the checkout
3. Your payment is converted to USDC and settled on-chain
4. The coin transfers to your wallet and appears in your portfolio

## How Selling Works

1. Go to a coin in your **Portfolio**
2. Click **List for sale** and set your asking price
3. When a buyer pays, settlement happens automatically:
   * You receive the sale price (minus a small platform fee)
   * If you originally submitted the coin, you also earn curator residuals on future resales

## Payment Splits

When a coin sells, the payment is split automatically:

| Recipient                        | What they receive                 |
| -------------------------------- | --------------------------------- |
| **Seller**                       | Sale price minus fees             |
| **Curator** (original submitter) | A small percentage of each resale |
| **Platform**                     | A transaction fee                 |

## Curator Residuals

If you submitted a coin to the Numex vault, you earn a residual on every future sale of that coin. Residuals accrue automatically and can be claimed at any time from your account.

## Packs

Mystery packs work the same way — pay with card or crypto, and the revealed coin is assigned to your portfolio. Every pack purchase is recorded and verified.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://numex-greenfield.gitbook.io/numex-docs/technology/marketplace-settlement.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.