stellar-php-sdk

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Build Stellar blockchain applications in PHP using soneso/stellar-php-sdk. Use when generating PHP code for transaction building, signing, Horizon API queries, Soroban RPC, smart contract deployment and invocation, XDR encoding/decoding, and SEP protocol integration. Covers all 26 operations, 50 Horizon endpoints, 12 RPC methods, and 20 SEP implementations with synchronous Guzzle HTTP patterns.

Soneso By Soneso schedule Updated 6/11/2026
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name: stellar-php-sdk description: Build Stellar blockchain applications in PHP using soneso/stellar-php-sdk. Use when generating PHP code for transaction building, signing, Horizon API queries, Soroban RPC, smart contract deployment and invocation, XDR encoding/decoding, and SEP protocol integration. Covers all 26 operations, 50 Horizon endpoints, 12 RPC methods, and 20 SEP implementations with synchronous Guzzle HTTP patterns. license: Apache 2.0 compatibility: Requires PHP 8.0+, ext-bcmath, ext-gmp, and Composer metadata: version: "1.0.4" sdk_version: "1.9.8" last_updated: "2026-06-11"

Stellar SDK for PHP

Overview

The soneso/stellar-php-sdk is a PHP 8.0+ library for the Stellar blockchain network. It provides 100% Horizon API coverage (50/50 endpoints), 100% Soroban RPC coverage (12/12 methods), 30/30 streaming endpoints, and 20 SEP implementations. All HTTP operations are synchronous using Guzzle 7. The root namespace is Soneso\StellarSDK.

Installation

composer require soneso/stellar-php-sdk

All code examples below assume <?php declare(strict_types=1); and relevant use imports.

If you can't find a constructor or method signature in this file or the topic references, grep references/api_reference.md — it has all public class/method signatures.

1. Stellar Basics

Fundamental Stellar concepts and SDK patterns.

Keys and KeyPairs

use Soneso\StellarSDK\Crypto\KeyPair;

// Generate new keypair
$keyPair    = KeyPair::random();
$accountId  = $keyPair->getAccountId();   // G... public address
$secretSeed = $keyPair->getSecretSeed();  // S... secret seed
// IMPORTANT: Store secretSeed securely. Never log or expose it.

// From existing seed (never hardcode — use getenv() in production)
$keyPair    = KeyPair::fromSeed(getenv('STELLAR_SECRET_SEED'));
$publicOnly = KeyPair::fromAccountId($accountId); // public-key-only, cannot sign

Accounts

use Soneso\StellarSDK\Crypto\KeyPair;
use Soneso\StellarSDK\StellarSDK;
use Soneso\StellarSDK\Util\FriendBot;

$keyPair   = KeyPair::random();
$accountId = $keyPair->getAccountId();

// Fund on testnet using FriendBot (10,000 test XLM)
FriendBot::fundTestAccount($accountId);

// Query account
$sdk     = StellarSDK::getTestNetInstance();
$account = $sdk->requestAccount($accountId);

echo 'Sequence: ' . $account->getSequenceNumber() . PHP_EOL;
echo 'Subentry Count: ' . $account->getSubentryCount() . PHP_EOL;

foreach ($account->getBalances() as $balance) {
    if ($balance->getAssetType() === 'native') {
        echo 'XLM: ' . $balance->getBalance() . PHP_EOL;
    } else {
        echo $balance->getAssetCode() . ': ' . $balance->getBalance() . PHP_EOL;
    }
}

// Check existence without exception (returns bool)
$exists = $sdk->accountExists('GDEF...');

Assets

use Soneso\StellarSDK\Asset;

$xlm = Asset::native(); // Returns AssetTypeNative instance

// 1-4 char code -> AssetTypeCreditAlphanum4; 5-12 char -> AssetTypeCreditAlphanum12
$usdc = Asset::createNonNativeAsset('USDC', 'GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN');

// From canonical form
$asset = Asset::createFromCanonicalForm('USDC:GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN');

Networks

use Soneso\StellarSDK\Network;
use Soneso\StellarSDK\StellarSDK;

// Testnet: Network::testnet() + StellarSDK::getTestNetInstance()
// Public:  Network::public()  + StellarSDK::getPublicNetInstance()
$network = Network::testnet();
$sdk     = StellarSDK::getTestNetInstance();

// Custom Horizon (HTTPS required — HTTP URLs throw InvalidArgumentException)
$network = new Network('My Custom Network ; Passphrase');
$sdk     = new StellarSDK('https://my-horizon.example.com');

2. Horizon API - Fetching Data

Query patterns for retrieving blockchain data. All calls are synchronous.

Query Accounts

$sdk = StellarSDK::getTestNetInstance();

// Query accounts with filters (builder pattern)
$response = $sdk->accounts()
    ->forSigner('GABC...')
    ->limit(10)
    ->order('desc')
    ->execute();

foreach ($response->getAccounts() as $acct) {
    echo $acct->getAccountId() . PHP_EOL;
}

For single account queries, see $sdk->requestAccount() in Accounts above.

Query Transactions

$sdk = StellarSDK::getTestNetInstance();

// Same builder pattern as accounts — forAccount(), limit(), order(), cursor()
$response = $sdk->transactions()
    ->forAccount('GABC...')
    ->limit(5)
    ->order('desc')
    ->execute();

foreach ($response->getTransactions() as $tx) {
    echo $tx->getHash() . ' ledger=' . $tx->getLedger() . PHP_EOL;
}

// Pagination: cursor from last result
$arr = $response->getTransactions()->toArray();
$nextPage = $sdk->transactions()->forAccount('GABC...')
    ->cursor(end($arr)->getPagingToken())->limit(5)->order('desc')->execute();

// Single transaction by hash
$tx = $sdk->requestTransaction('abc123def...');

For all Horizon endpoints, advanced queries, and pagination patterns: Horizon API Reference

3. Horizon API - Streaming

Real-time update patterns using Server-Sent Events. Streaming runs in a blocking while(true) loop.

Stream Payments

use Soneso\StellarSDK\Responses\Operations\PaymentOperationResponse;

// Stream payments for an account (blocking infinite loop)
$sdk->payments()
    ->forAccount($accountId)
    ->cursor('now')
    ->stream(function (PaymentOperationResponse $payment) {
        echo $payment->getFrom() . ' -> ' . $payment->getTo() . ': ' . $payment->getAmount() . PHP_EOL;
    });
// WRONG: return false to stop streaming -- return values are IGNORED
// CORRECT: throw an exception to break out, or use exit() in a forked child process

The same pattern applies to all streamable resources (transactions(), ledgers(), operations(), etc.). Auto-reconnects on server errors with a 10-second delay. Streams block indefinitely — use pcntl_fork() to run a stream alongside other operations (see streaming guide).

For reconnection patterns and all 30 streaming endpoints: Horizon Streaming Guide

4. Transactions & Operations

Complete transaction lifecycle: Build -> Sign -> Submit.

Transaction Lifecycle

use Soneso\StellarSDK\Crypto\KeyPair;
use Soneso\StellarSDK\TransactionBuilder;
use Soneso\StellarSDK\PaymentOperationBuilder;
use Soneso\StellarSDK\Asset;
use Soneso\StellarSDK\Memo;

$sdk     = StellarSDK::getTestNetInstance();
$network = Network::testnet();

// 1. Load source account keypair
$sourceKeyPair = KeyPair::fromSeed(getenv('STELLAR_SECRET_SEED'));
$sourceId      = $sourceKeyPair->getAccountId();

// 2. Fetch source account (provides sequence number)
$sourceAccount = $sdk->requestAccount($sourceId);

// 3. Build the transaction
$paymentOp = (new PaymentOperationBuilder(
    'GDEST...', // destination account ID
    Asset::native(),
    '100.50'    // amount in XLM
))->build();

// A transaction can contain up to 100 operations.
$transaction = (new TransactionBuilder($sourceAccount))
    ->addOperation($paymentOp)
    ->addMemo(Memo::text('Payment for services'))
    ->setMaxOperationFee(200) // stroops per operation
    ->build();

// 4. Sign the transaction
$transaction->sign($sourceKeyPair, $network);

// 5. Submit to Horizon
$response = $sdk->submitTransaction($transaction);
if ($response->isSuccessful()) {
    echo 'Success! Hash: ' . $response->getHash() . PHP_EOL;
} else {
    $codes = $response->getExtras()->getResultCodes();
    echo 'Failed: ' . $codes->getTransactionResultCode() . PHP_EOL;
    echo 'Op codes: ' . json_encode($codes->getOperationsResultCodes()) . PHP_EOL;
}
// For HorizonRequestException handling, see Error Handling section

Common Operations

Change Trust (Establish Trustline):

use Soneso\StellarSDK\ChangeTrustOperationBuilder;

$asset = Asset::createNonNativeAsset('USDC', 'GISSUER...');
$trustOp = (new ChangeTrustOperationBuilder($asset))->build();
// Optional: set limit with ChangeTrustOperationBuilder($asset, '1000.00')

Manage Sell Offer (DEX):

use Soneso\StellarSDK\ManageSellOfferOperationBuilder;

$selling = Asset::createNonNativeAsset('USDC', 'GISSUER...');
$buying  = Asset::native();

// Create new offer (offerId defaults to 0)
$offerOp = (new ManageSellOfferOperationBuilder(
    $selling, $buying, '100.00', '0.50' // amount selling, price
))->build();

// Query offers to get offer ID
$offers = $sdk->offers()->forAccount($accountId)->execute()->getOffers();
$offerId = $offers->toArray()[0]->getOfferId(); // WRONG: getId() — CORRECT: getOfferId()

// Update existing offer (amount '0' deletes it)
$updateOp = (new ManageSellOfferOperationBuilder($selling, $buying, '200.00', '0.55'))
    ->setOfferId($offerId)->build();

For all 26 operations with parameters and examples: Operations Reference

5. Soroban RPC API

RPC endpoint patterns for Soroban smart contract queries.

use Soneso\StellarSDK\Soroban\SorobanServer;

$server = new SorobanServer('https://soroban-testnet.stellar.org');
// $server->setLogger($psr3Logger); // optional: PSR-3 debug logging
$health = $server->getHealth(); // ->status

For all 12 RPC methods including event queries and transaction simulation: RPC Reference

6. Smart Contracts

Contract deployment and invocation patterns using the high-level SorobanClient.

Deploy Contract

use Soneso\StellarSDK\Crypto\KeyPair;
use Soneso\StellarSDK\Network;
use Soneso\StellarSDK\Soroban\Contract\SorobanClient;
use Soneso\StellarSDK\Soroban\Contract\InstallRequest;
use Soneso\StellarSDK\Soroban\Contract\DeployRequest;
use Soneso\StellarSDK\Xdr\XdrSCVal;

$keyPair = KeyPair::fromSeed(getenv('STELLAR_SECRET_SEED'));
$rpcUrl  = 'https://soroban-testnet.stellar.org';
$network = Network::testnet();

// Step 1: Install WASM bytecode (returns wasm hash)
$wasmBytes = file_get_contents('/path/to/contract.wasm');
$wasmHash = SorobanClient::install(new InstallRequest(
    sourceAccountKeyPair: $keyPair,
    wasmBytes: $wasmBytes,
    network: $network,
    rpcUrl: $rpcUrl,
));

// Step 2: Deploy contract instance
$client = SorobanClient::deploy(new DeployRequest(
    sourceAccountKeyPair: $keyPair,
    wasmHash: $wasmHash,
    network: $network,
    rpcUrl: $rpcUrl,
    constructorArgs: [XdrSCVal::forSymbol('init')], // optional constructor args
));
echo 'Contract ID: ' . $client->getContractId() . PHP_EOL;

Invoke Contract Function

use Soneso\StellarSDK\Soroban\Contract\ClientOptions;
use Soneso\StellarSDK\Soroban\Contract\MethodOptions;

// Create client for an existing contract
$client = SorobanClient::forClientOptions(new ClientOptions(
    sourceAccountKeyPair: $keyPair,
    contractId: 'CABC...',
    network: $network,
    rpcUrl: $rpcUrl,
));

// Read call (simulation only, no transaction submitted)
$result = $client->invokeMethod('get_count');
echo 'Count: ' . $result->u32 . PHP_EOL;

// Write call (simulates, signs, submits automatically)
$result = $client->invokeMethod('increment', [XdrSCVal::forU32(5)]);

// With custom options (fee, timeout)
$result = $client->invokeMethod('expensive_operation', [XdrSCVal::forSymbol('data')],
    methodOptions: new MethodOptions(fee: 10000, timeoutInSeconds: 60));

For contract authorization, multi-auth workflows, and remote signing: Smart Contracts Guide

7. XDR Encoding & Decoding

XDR (External Data Representation) is Stellar's binary serialization format.

Transaction XDR Roundtrip

use Soneso\StellarSDK\AbstractTransaction;

// Encode: Transaction -> base64 XDR
$xdrBase64 = $transaction->toEnvelopeXdrBase64();

// Decode: base64 XDR -> Transaction
$decoded = AbstractTransaction::fromEnvelopeBase64XdrString($xdrBase64);
echo 'Source: ' . $decoded->getSourceAccount()->getAccountId() . PHP_EOL;

Working with Soroban XDR Values (XdrSCVal)

use Soneso\StellarSDK\Xdr\XdrSCVal;
use Soneso\StellarSDK\Xdr\XdrSCAddress;
use Soneso\StellarSDK\Xdr\XdrSCMapEntry;
use Soneso\StellarSDK\Xdr\XdrUInt128Parts;

// Common types: forBool(), forU32(), forI64(), forString(), forSymbol(), forBytes(), forVoid()
$symVal  = XdrSCVal::forSymbol('transfer');
$addrVal = XdrSCVal::forAddress(XdrSCAddress::forAccountId('GABC...'));
$u128Val = XdrSCVal::forU128(new XdrUInt128Parts(hi: 0, lo: 1000000));

// Vec (array of XdrSCVal) and Map (array of XdrSCMapEntry)
$vecVal = XdrSCVal::forVec([XdrSCVal::forU32(1), XdrSCVal::forU32(2)]);
$mapVal = XdrSCVal::forMap([new XdrSCMapEntry($symVal, XdrSCVal::forU32(42))]);

// Serialize to/from base64 XDR
$base64  = $symVal->toBase64Xdr();
$decoded = XdrSCVal::fromBase64Xdr($base64);

To submit a pre-signed XDR envelope: $sdk->submitTransactionEnvelopeXdrBase64($signedXdrBase64).

For all XdrSCVal factory methods and type mapping: XDR Reference | Contract Arguments

8. Error Handling & Troubleshooting

Horizon Errors

use Soneso\StellarSDK\Exceptions\HorizonRequestException;

try {
    $account = $sdk->requestAccount('GINVALID...');
} catch (HorizonRequestException $e) {
    $statusCode   = $e->getStatusCode();         // e.g., 404
    $retryAfter   = $e->getRetryAfter();         // seconds (429 rate limit), or null
    $horizonError = $e->getHorizonErrorResponse();
    if ($horizonError !== null) {
        echo $horizonError->getTitle() . ': ' . $horizonError->getDetail() . PHP_EOL;
        // For transaction errors: $horizonError->getExtras()->getResultCodesTransaction()
    }
}

Transaction submission error handling (non-exception path) is shown in the Transaction Lifecycle example above.

Soroban RPC Errors

$txResponse = $server->getTransaction('abc123...');
if ($txResponse->error !== null) {
    echo 'RPC error: ' . $txResponse->error->getMessage() . PHP_EOL;
}
// Check status: 'SUCCESS', 'FAILED', or 'NOT_FOUND' (pending/invalid)
match ($txResponse->status) {
    'SUCCESS'   => /* transaction succeeded */,
    'FAILED'    => /* transaction failed */,
    'NOT_FOUND' => /* pending or invalid hash */,
};

For comprehensive error catalog, result codes, and retry patterns: Troubleshooting Guide

9. Security Best Practices

Critical patterns: never hardcode secret seeds (use getenv() or vault), verify transaction details before signing, validate network passphrase, validate user inputs (account ID format, amount precision). Always use string amounts to avoid floating-point precision errors.

For complete security patterns including input validation, transaction verification, and key management: Security Guide

10. SEP Implementations

The PHP SDK implements 20 Stellar Ecosystem Proposals (SEPs). Most commonly used: SEP-01 (Stellar TOML discovery), SEP-02 (Federation address resolution), SEP-05 (BIP-39 mnemonic key derivation), SEP-10 (Web Authentication for account ownership proof), SEP-24 (Interactive deposit/withdrawal flows), SEP-51 (XDR-JSON encoding for human-readable interchange of Stellar XDR types). All SEP classes are under the Soneso\StellarSDK\SEP\ namespace; SEP-51 lives under Soneso\StellarSDK\Xdr\ because it operates on XDR types directly.

For all SEP examples and the complete implementation table: SEP Reference

11. Advanced Features

  • Multi-signature accounts — add signers + set thresholds in a SINGLE transaction to avoid lockout → Multi-Sig Example
  • Sponsored reserves — three-operation pattern (Begin → Create → End), both parties sign → Sponsorship Example
  • Fee bump transactions — FeeBumpTransactionBuilder → Fee Bump Example
  • Liquidity pools — AMM with AssetTypePoolShare → Pools Example
  • Muxed accounts — MuxedAccount with M... addresses → Muxed Example
  • Async submission — submitAsyncTransaction() → Async Example

Reference Documentation

Links to comprehensive reference guides:

Common Pitfalls

Stroop precision: Stellar amounts have 7 decimal places. Always use string amounts to avoid floating-point errors.

// WRONG: floating point
$amount = 100.1234567; // May lose precision

// CORRECT: string amount
$amount = '100.1234567';

Sequence number staleness: TransactionBuilder->build() mutates the source account's sequence number. A good practice is to fetch the account immediately before building. Don't increment manually — build() handles it. Stale sequence numbers cause tx_bad_seq errors.

// CORRECT: reload account, build() increments sequence internally
$account = $sdk->requestAccount($accountId); // on-chain seq N
$tx = (new TransactionBuilder($account))->addOperation($op)->build(); // uses seq N+1
$sdk->submitTransaction($tx);

// WRONG: manually incrementing — build() already does this
$account = $sdk->requestAccount($accountId); // on-chain seq N
$account->incrementSequenceNumber(); // now N+1
$tx = (new TransactionBuilder($account))->addOperation($op)->build(); // seq N+2 — tx_bad_seq

Sequence numbers are BigInteger objects:

use phpseclib3\Math\BigInteger;

// WRONG: arithmetic operators on BigInteger
$seqNum = $account->getSequenceNumber() - 1; // TypeError

// CORRECT: use BigInteger methods
$seqNum = $account->getSequenceNumber()->subtract(new BigInteger(1));
$account = new Account($account->getAccountId(), $seqNum); // account with modified seq num

Collection count — use method, not function:

// WRONG: PHP count() — SDK collections do NOT implement Countable
count($account->getSigners()); // TypeError or returns 1 (misleading)

// CORRECT: use the ->count() method on all SDK collection objects
$account->getSigners()->count();
// Same for: TransactionsResponse, OperationsResponse, OffersResponse,
// PaymentsResponse, TradesResponse, EffectsResponse, etc.

Insufficient signatures return op_bad_auth, not tx_bad_auth: When a multi-sig transaction lacks enough signature weight, the transaction-level code is tx_failed and the auth failure is in the operation codes.

// WRONG: checking transaction code for auth failure
$txCode = $extras->getResultCodesTransaction(); // returns 'tx_failed'
if ($txCode === 'tx_bad_auth') { ... } // never matches

// CORRECT: check operation codes for op_bad_auth
$opCodes = $extras->getResultCodesOperation(); // returns ['op_bad_auth']

Fee calculation: The fee is per operation. For a transaction with N operations at setMaxOperationFee(200), the total fee is N * 200 stroops. The minimum base fee is 100 stroops per operation (StellarConstants::MIN_BASE_FEE_STROOPS).

Install via CLI
npx skills add https://github.com/Soneso/stellar-php-sdk --skill stellar-php-sdk
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