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Install

cargo add orbitflare-sdk --features jetstream

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Building the client

use orbitflare_sdk::{JetstreamClientBuilder, RetryPolicy, Result};
use std::time::Duration;

let client = JetstreamClientBuilder::new()
    .url("http://ny.jetstream.orbitflare.com")
    .fallback_url("http://fra.jetstream.orbitflare.com")
    .retry(RetryPolicy {
        initial_delay: Duration::from_millis(100),
        max_delay: Duration::from_secs(30),
        multiplier: 2.0,
        max_attempts: 0,
    })
    .timeout_secs(30)
    .keepalive_secs(60)
    .ping_interval_secs(10)
    .max_missed_pongs(3)
    .channel_capacity(4096)
    .build()?;
Minimal: 
let client = JetstreamClientBuilder::new()
    .url("http://ny.jetstream.orbitflare.com")
    .build()?;
URL falls back to ORBITFLARE_JETSTREAM_URL env var. All builder methods are identical to the gRPC client - same defaults, same behavior.

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Writing a YAML config

JetStream supports transaction and account filters. No slots, blocks, or commitment - those are Yellowstone-specific. 
# jetstream.yml
transactions:
  raydium:
    account_include:
      - "675kPX9MHTjS2zt1qfr1NYHuzeLXfQM9H24wFSUt1Mp8"
  pumpfun:
    account_include:
      - "6EF8rrecthR5Dkzon8Nwu78hRvfCKubJ14M5uBEwF6P"

accounts:
  my_wallet:
    account:
      - "YOUR_WALLET_ADDRESS"
    owner:
      - "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"

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YAML filter reference

transactions - named filters. account_include matches transactions involving those addresses. account_exclude removes matches. account_required means all listed addresses must appear. accounts - watch specific addresses with account, or all accounts owned by a program with owner. Supports ${ENV_VAR} expansion.

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Subscribing and reading events

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From YAML

let mut stream = client.subscribe_yaml("jetstream.yml")?;

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Programmatically

use std::collections::HashMap;
use orbitflare_sdk::proto::jetstream::*;

let mut filters = HashMap::new();
filters.insert("target".into(), SubscribeRequestFilterTransactions {
    account_include: vec![some_address.to_string()],
    account_exclude: vec![],
    account_required: vec![],
});

let request = SubscribeRequest {
    transactions: filters,
    accounts: HashMap::new(),
    ping: Some(SubscribeRequestPing { id: 1 }),
};

let mut stream = client.subscribe(request);

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Reading the stream

use orbitflare_sdk::proto::jetstream::subscribe_update::UpdateOneof;

while let Some(update) = stream.next().await {
    let update = update?;
    match update.update_oneof {
        Some(UpdateOneof::Transaction(tx)) => {
            // tx.slot - the slot number
            // tx.transaction - transaction info with signature, account_keys,
            //   instructions, address_table_lookups
        }
        Some(UpdateOneof::Account(acct)) => {
            // acct.slot - the slot
            // acct.account - account info (pubkey, lamports, owner, data)
            // acct.is_startup - true during initial snapshot
        }
        _ => {}
    }
}
Closing, multiple streams, reconnection, and ping/pong all work identically to the gRPC client.

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Full example

A stream that watches Raydium AMM swaps and prints each transaction’s signature and instruction count. 
use orbitflare_sdk::{JetstreamClientBuilder, Result};
use orbitflare_sdk::proto::jetstream::subscribe_update::UpdateOneof;

#[tokio::main]
async fn main() -> Result<()> {
    let client = JetstreamClientBuilder::new()
        .url("http://ny.jetstream.orbitflare.com")
        .build()?;

    let mut stream = client.subscribe_yaml("jetstream.yml")?;
    let mut count: u64 = 0;

    println!("streaming raydium txs...");

    while let Some(update) = stream.next().await {
        let update = update?;

        if let Some(UpdateOneof::Transaction(tx)) = update.update_oneof {
            count += 1;
            if let Some(info) = &tx.transaction {
                let sig = bs58::encode(&info.signature).into_string();
                let num_ix = info.instructions.len();
                let num_accounts = info.account_keys.len();

                println!(
                    "#{count} slot={} sig={}... ix={num_ix} accounts={num_accounts}",
                    tx.slot,
                    &sig[..16],
                );
            }
        }
    }

    Ok(())
}
With this jetstream.yml: 
transactions:
  raydium:
    account_include:
      - "675kPX9MHTjS2zt1qfr1NYHuzeLXfQM9H24wFSUt1Mp8"