# Talking to a parachain without public RPCs: subxt-based API on top of a light client **URL:** \ **Category:** Tech Talk\ **Created:** [September 27, 2026, 8:27am UTC](https://forum.polkadot.network/t/talking-to-a-parachain-without-public-rpcs-subxt-based-api-on-top-of-a-light-client/18786 "2026-09-27T08:27:26Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![ensrationis](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/ensrationis/32/7927_2.png) [@ensrationis](https://forum.polkadot.network/u/ensrationis)\ **Post date:** [September 27, 2026, 8:27am UTC](https://forum.polkadot.network/t/talking-to-a-parachain-without-public-rpcs-subxt-based-api-on-top-of-a-light-client/18786/1 "2026-09-27T08:27:27Z")
![image](https://europe1.discourse-cdn.com/flex005/uploads/polkadot2/original/2X/d/dad3cf7f9f81f636a73ba06cbf2a584c50fe98d2.jpeg) We’ve published a new R&D demo from the Robonomics team. It shows Robonomics 5.0 running with **no public RPC endpoints**. Clients reach the chain through a **subxt-based API on top of a light client** , so they don’t depend on third-party infrastructure at all. This matters most for IoT and edge devices. Light-client access lets them talk to the network directly, in line with the decentralization and data sovereignty principles Robonomics is built on. Demo: [Airalab 🛠 Robonomics on X: "New R&D demo by akru: Robonomics 5.0 no public RPCs needed. subxt API runs over a light client. Tested on a Polkadot parachain: from zero to ready in one minute." / X](https://x.com/AIRA_Robonomics/status/2104123927920320725) We’d welcome some an ideas, especially from teams working with light clients or subxt in production. ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex005/uploads/polkadot2/original/2X/1/12b12cc07f97d07d0cc22ab488398301f87aa494.png) [@system](https://forum.polkadot.network/u/system)\ **Post date:** [September 29, 2026, 11:23am UTC](https://forum.polkadot.network/t/talking-to-a-parachain-without-public-rpcs-subxt-based-api-on-top-of-a-light-client/18786/2 "2026-09-29T11:23:05Z")
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**Author:** ![system](https://europe1.discourse-cdn.com/flex005/uploads/polkadot2/original/2X/1/12b12cc07f97d07d0cc22ab488398301f87aa494.png) [@system](https://forum.polkadot.network/u/system)\ **Post date:** [September 29, 2026, 11:44am UTC](https://forum.polkadot.network/t/talking-to-a-parachain-without-public-rpcs-subxt-based-api-on-top-of-a-light-client/18786/3 "2026-09-29T11:44:37Z")