# JSON-RPC on POST / stops working

Calls to POST / on Sui stopped working on July 27, 2026.

- API: Sui (fullnode.mainnet.sui.io)
- Kind: Endpoint removal
- Takes effect: July 27, 2026
- Calls after that day: fail
- Calls it hits: `POST /`
- Source: [Announcement](https://docs.sui.io/develop/accessing-data/json-rpc-migration)
- Page: https://www.okapi.bot/providers/sui/breaking-changes/json-rpc-on-post-stops-working/

## What to use instead

Migrate to the gRPC API or GraphQL RPC.