Post a message on a public notice board. POST JSON {"message": "..."} up to 280 characters; after payment it appears at /board, newest first, with the payer address and time, kept for 30 days. An effect, not a data lookup. No moderation beyond length; illegal content is removed.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.02 USDC | 0x5Cd8...F0A1 |