OpenViSTAI · Agents · Blockchain · Crypto
Submit a project
Menu
Oracles & Data

Doppler

Doppler is a Solana oracle program for publishing high-frequency, low-latency price-feed updates and other fixed-size payloads.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Doppler — OpenViST project profile in Oracles & Data.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use Doppler when an application needs a compact Solana feed with publisher-controlled updates, explicit ordering and a fixed-size schema.

Who it is for

  • Solana developers building applications that consume on-chain price feeds
  • DeFi builders needing sequenced oracle updates
  • Publishers of fixed-size non-price data on Solana

Documented uses

  • Publish a price or generic fixed-size payload on-chain
  • Enforce strictly increasing update sequences
  • Read packed feed data from the SDK or another Solana framework
  • Construct custom transactions from Doppler instructions and budget information
Before you choose

Requirements & limits

The repository is public and MIT-licensed. The documented clients include Rust SDK usage and TypeScript packages.

  • Payloads are fixed-size and described by a shared manifest.
  • Updates require an admin signature and a strictly increasing sequence.
  • The documented update cost is 21 compute units for a u64 feed and 25 for the Price payload.
  • Unix-millisecond sequences enable the documented freshness helper; other sequence conventions require a different freshness design.
  • The SDK exposes raw instructions and budget information for custom transaction assembly.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Set up and use a Doppler price feed

Load a Price manifest, deploy the feed, publish a sequenced update and read it through the documented Rust SDK.

Before you start

  • A Doppler manifest such as doppler.json with an admin, seed and Price fields.
  • The Doppler SDK and the documented Solana Rust crates.
  • An RPC endpoint and an admin signer.

Steps

  1. Load the manifest with DopplerClient::::load and provide the RPC client and SendOptions.

  2. Call deploy().send with the admin signer to write the program and create the feed account.

  3. Call update with a Unix-millisecond sequence and Price payload, then send it with the admin signer.

  4. Call read to obtain the sequence and packed Price value; use price_no_older_than when the feed sequence follows the SDK's Unix-millisecond convention.

Expected outcome

A deployed feed can receive sequenced Price updates and expose the stored value and sequence to a reader.

Guide limitations

  • The documented freshness helper assumes Unix-millisecond sequences; feeds using another sequence convention need time in their payload or do not provide that freshness interpretation.
  • The payload type must match the manifest fields; the SDK reports a mismatch during load.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
1 October 2026
Original website title
blueshift-gg/doppler · Official homepage title · retained in its source language
How we review sourcesSuggest a correction