# PayTo Protocol Prefix

| brfc         | title                                               | author        | version |
| ------------ | --------------------------------------------------- | ------------- | ------- |
| 7bd25e5a1fc6 | bsvalias Payment Addressing (PayTo Protocol Prefix) | andy (nChain) | 1       |

The PayTo Protocol Prefix specification defines the URI prefix `payto:` to mean *launch a paymail payment to the specified paymail handle*. Additional query string parameters *MAY* be included; these are defined below.

paymail client implementers *SHOULD* ensure that their application is registered with the target device operating system as a protocol/deeplink handler for the `payto:` protocol prefix.

## Full Specification

```
payto:<receiver>?amount=<amount>&purpose=<purpose>
```

| Token      | Required | Description                                                                           |
| ---------- | -------- | ------------------------------------------------------------------------------------- |
| `receiver` | ✓        | `<alias>@<domain>.<tld>` formatted paymail handle, for example `payments@example.org` |
| `amount`   |          | Integer number of satoshis to be paid.                                                |
| `purpose`  |          | Human-readable description of the purpose of the payment                              |

## Capability Discovery

This specification governs client-side behaviour. No specific capabilities are delivered by paymail implementations.


---

# Agent Instructions: 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://hub.bsvblockchain.org/bsv-skills-center/paymail/payment-addressing/payto-protocol-prefix.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.