# JSON-RPC on POST / stops working

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

Calls to POST / on fullnode.mainnet.sui.io fail since July 27, 2026. The Sui Foundation disabled JSON-RPC on its Mainnet full nodes on that date. Requests made to this endpoint are no longer served.

## What to use instead

Migrate to the gRPC API or GraphQL RPC.

- API: Sui (fullnode.mainnet.sui.io)
- Kind: 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)
- Verified: November 6, 2026, against Sui's own pages
- Page: https://www.okapi.bot/providers/sui/breaking-changes/json-rpc-on-post-stops-working/

## Sui's words

> JSON-RPC is disabled on Sui Foundation Mainnet full nodes. The shutoff took effect the week of July 27, 2026.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent