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Configure Horizon API endpoints for Stellar to connect to different networks, use custom nodes, or optimize performance. Stellar uses Horizon as its HTTP API layer instead of traditional RPC endpoints.

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Configure Horizon Server

import { Horizon, Networks } from "@stellar/stellar-sdk";

// Public Horizon endpoints
const mainnetServer = new Horizon.Server("https://horizon.stellar.org");
const testnetServer = new Horizon.Server("https://horizon-testnet.stellar.org");

// Custom Horizon endpoint (e.g., self-hosted or third-party provider)
const customServer = new Horizon.Server("https://your-custom-horizon.example.com", {
  allowHttp: false, // set to true only for local development
});

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Switch Networks

When switching between mainnet and testnet, update both the Horizon URL and the network passphrase used for signing: 
import { useMemo } from 'react';
import { useClient, useAccount } from '@getpara/react-native-wallet';
import { createParaStellarSigner } from '@getpara/stellar-sdk-v14-integration';
import { Horizon, Networks } from "@stellar/stellar-sdk";

type StellarNetwork = "mainnet" | "testnet";

const NETWORK_CONFIG = {
  mainnet: {
    horizonUrl: "https://horizon.stellar.org",
    networkPassphrase: Networks.PUBLIC,
  },
  testnet: {
    horizonUrl: "https://horizon-testnet.stellar.org",
    networkPassphrase: Networks.TESTNET,
  },
} as const;

function useStellarNetwork(network: StellarNetwork) {
  const para = useClient();
  const { isConnected } = useAccount();
  const config = NETWORK_CONFIG[network];

  const signer = useMemo(() => {
    if (!para || !isConnected) return null;
    return createParaStellarSigner({
      para,
      networkPassphrase: config.networkPassphrase,
    });
  }, [para, isConnected, config.networkPassphrase]);

  const server = new Horizon.Server(config.horizonUrl);

  return { server, signer, isLoading: !para, networkPassphrase: config.networkPassphrase };
}

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Check Server Health

import { Horizon } from "@stellar/stellar-sdk";

async function checkHorizonHealth() {
  const server = new Horizon.Server("https://horizon.stellar.org");

  // Get ledger info
  const ledger = await server.ledgers().order("desc").limit(1).call();
  const latestLedger = ledger.records[0];
  console.log("Latest ledger:", latestLedger.sequence);
  console.log("Closed at:", latestLedger.closed_at);

  // Get fee stats
  const feeStats = await server.feeStats();
  console.log("Base fee:", feeStats.last_ledger_base_fee);
  console.log("Fee charged (p50):", feeStats.fee_charged.p50);
}

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Next Steps