> For the complete documentation index, see [llms.txt](https://guide.geyser.fund/geyser-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.geyser.fund/geyser-docs/product-guides/contribute-on-geyser/contribute-with-bitcoin.md).

# Contribute with Bitcoin

#### How to Contribute with Bitcoin

1. Go to the **project page**.
2. Click **Contribute** and configure/confirm your account password 
3. Select the **On-chain** tab.
4. **Download the Refund File** - this is essential in case the payment fails.
5. Scan the QR code or click **Copy address** to pay from your wallet.
6. Optionally, enter your email to get payment status updates.

***

#### Important Payment & Refund Tips

* Send the **exact amount in satoshis** shown on Geyser.
* Use a **medium or high transaction fee** (adjust sat/vB manually if needed) to ensure the swap completes within 24 hours.
* **Download and safely store** your Refund File. You can re-download it anytime if unsure.

***

### Fees for on-chain donations

On-chain donations may include the following fees:

* **Geyser fee:**
  * 5% platform fee
* **Boltz fee:** 0.1%
* **Affiliate fees (optional):**
  * A % set by the creator to reward promoters or
  * 10% for Geyser Promotion Network contributions
* **On-chain fee:** varies based on network congestion

{% hint style="warning" %}
If a payment fails, you’ll only pay for two on-chain transactions - one for the payment and one for the [refund](/geyser-docs/product-guides/contribute-on-geyser/how-to-claim-a-refund.md).
{% endhint %}

### How to claim a Refund

If your payment fails, follow instructions [How to claim a Refund](/geyser-docs/product-guides/contribute-on-geyser/how-to-claim-a-refund.md).


---

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