Yellowstone gRPC, streamed to your server.

import Client, { CommitmentLevel } from "@triton-one/yellowstone-grpc";

// Plaintext HTTP/2: http://, never https://. No x-token: your IP is the credential.
const client = new Client("http://88.216.36.108:10001", undefined, {
  grpcMaxDecodingMessageSize: 64 * 1024 * 1024, // a busy slot exceeds the 4 MiB default
});

const stream = await client.subscribe({
  accounts: {
    owned: { account: [], owner: ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"], filters: [] },
  },
  slots: { clock: { filterByCommitment: false } },
  transactions: {}, transactionsStatus: {}, blocks: {}, blocksMeta: {}, entry: {},
  accountsDataSlice: [],
  commitment: CommitmentLevel.PROCESSED,
});

stream.on("data", (update) => {
  if (update.slot) console.log("slot", update.slot.slot);
  if (update.account) console.log("account", update.filters);
});

use futures::StreamExt;
use std::collections::HashMap;
use yellowstone_grpc_client::GeyserGrpcClient;
use yellowstone_grpc_proto::prelude::{CommitmentLevel, SubscribeRequest, SubscribeRequestFilterSlots};

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    // Plaintext HTTP/2, and no token: the source IP is the credential.
    let mut client = GeyserGrpcClient::build_from_shared("http://88.216.36.108:10001")?
        .x_token::<String>(None)?
        .max_decoding_message_size(64 * 1024 * 1024)
        .connect()
        .await?;

    let mut slots = HashMap::new();
    slots.insert("clock".to_owned(), SubscribeRequestFilterSlots::default());
    let request = SubscribeRequest {
        slots,
        commitment: Some(CommitmentLevel::Processed as i32),
        ..Default::default()
    };

    let mut stream = client.subscribe_once(request).await?;
    while let Some(update) = stream.next().await {
        println!("{:?}", update?.update_oneof);
    }
    Ok(())
}

# No reflection, so grpcurl needs the proto.
BASE="https://raw.githubusercontent.com/rpcpool/yellowstone-grpc/master/yellowstone-grpc-proto/proto"
curl -fsSO "$BASE/geyser.proto" && curl -fsSO "$BASE/solana-storage.proto"

# -plaintext: HTTP/2 without TLS. No metadata: your address is checked.
grpcurl -plaintext -proto geyser.proto -import-path . \
  -d '{}' 88.216.36.108:10001 geyser.Geyser/GetSlot