Landing Price Updates - Hadron Docs

Your crank may send a price update every time your price moves, up to once per slot. Those updates need to land quickly, and they need to stay cheap.

Use V1 transactions

Solana’s V1 transaction format (live on mainnet since 15 September 2026) lets a transaction declare up front how much compute and data it needs. A Hadron price update is tiny, so it can declare a tiny budget. Validators treat it as cheap to include, so it lands ahead of larger transactions paying the same. Use these settings for a midprice update:

Setting	Value	Why
Compute limit	37	Exactly what an update uses.
Loaded-data limit	Program size plus headroom	It has to cover the Hadron program (about 300 KB) and the pool’s accounts. Work it out when your crank starts, so a program upgrade can’t break it.
Sequence	Your price’s timestamp	A late update with an older price is rejected instead of overwriting a newer one.

If you’d like more help with landing, we’re happy to introduce you to one of our partners. Contact: Telegram @adamgpeters, @srhhadron · Email adam@hadron.fi, srinath@hadron.fi