That is already possible. You can set a price on a paymail and anyone else can buy it for that price. Click the arrow on the left of your paymail.
What the chain says
- Block
- 635 737
- Time
- 2020-05-20T12:23:29Z
- Signer
- 1NVhkFTTTahgmFWAFThULCPqURwoJUoHC7
- App
- twetch
- Type
- post
- Content type
- text/plain
- Name in tx
- twetch#6
Fields the transaction did not carry are omitted. Open the payload to see the bytes as stored.
Signed by
1NVhkFTTTahgmFWAFThULCPqURwoJUoHC7 Verified