stellar-web-sdk

A self-contained web SDK for Stellar swaps. It aggregates six swap sources — four Stellar-native providers plus NEAR and Axelar ITS for cross-chain routes — behind one API, and talks to every one of them directly. There is no backend: no server to deploy, none to point at, and no SDK API key to obtain.

Provider	Execution	`minBuyAmount`	Third-party recipient
STELLARBROKER	interactive WebSocket session	`null` (no on-chain floor)	no
SOROSWAP	signed transaction	enforced	yes
AQUARIUS	signed transaction	enforced	no
STELLAR_DEX	signed transaction	enforced	yes
NEAR (cross-chain)	deposit to address	enforced	yes
AXELAR_ITS (cross-chain)	signed transaction	enforced (1:1 bridge)	yes

The SDK ships the provider adapters themselves. Quote fetching, quote normalization, route construction, route discovery, the provider fan-out, the routing solver and outcome tracking all run in this package — src/providers/ holds one adapter per venue, src/routing/ holds discovery and the fan-out, src/core/selection.ts holds the selection policy, and src/tracking/ follows a swap to its outcome. The SDK talks to StellarBroker, Soroswap, Aquarius, Horizon, 1Click and Axelar directly.

Every upstream serves CORS-enabled responses, so this works in a browser as well as in Node.

The only keys that exist belong to upstream services, and all of them are passed to the constructor:

const sdk = new StellarSwapSDK({
  credentials: {
    soroswapApiKey: '…',            // required for Soroswap routes; others serve the pair without it
    stellarBrokerPartnerKey: '…',   // required to COMMIT a StellarBroker session
    nearApiJwt: '…'                 // optional — raises 1Click's rate limit
  },
  // Optional commercial Horizon + Soroban RPC. One key, both endpoints — the public Stellar
  // endpoints are rate-limited enough to drop routes under a real fan-out.
  validationCloud: { apiKey: '…' }
})

Endpoint precedence for Horizon and Soroban RPC alike: an explicit horizonUrl / endpoints.sorobanRpcUrl wins, then validationCloud, then the public host — so you can route one through a vendor and the other elsewhere.

In a trusted environment pass the keys directly. For a public web app leave credentials unset and point config.fetch at your own proxy, since anything passed here reaches the browser bundle.

Execution is client-side too:

Soroswap / Aquarius / Stellar DEX / Axelar ITS — the SDK builds or receives the envelope, signs it, and submits it to Horizon itself.
StellarBroker — the SDK talks to the broker directly, opening its own WebSocket to wss://api.stellar.broker/ws and running the trade. Because every StellarBroker transaction is built by the broker, the SDK runs a full signing-security pipeline (shape validation, cryptographic trader-signature detection, per-tx debit budget, classic fee-bumps, and Soroban two-phase auth-entry signing) before signing each one.
NEAR — a deposit to an address; the SDK builds Stellar-origin deposits and returns the instruction for any other origin chain.

Tracking follows the same rule — each provider is read wherever its truth actually lives: Horizon for the Stellar-native providers, 1Click's status endpoint for NEAR, the Axelarscan GMP API for Axelar ITS. sdk.track(route, hash) returns the settled amounts read from the chain, never a claimed figure.

See ARCHITECTURE.md for the component map and BENCHMARKS.md for measured routing performance.

Install

npm install stellar-web-sdk @stellar/stellar-sdk

To track unreleased changes, install straight from the repository instead — it compiles from source on install and yields the same dist/, with identical import paths:

npm install github:horizontalsystems/stellar-web-sdk @stellar/stellar-sdk

Runtime requirements: fetch (Node 18+/browser) and, for StellarBroker sessions, WebSocket (Node 22+/browser). Both can be injected via config for older runtimes.

Quick start

import { StellarSwapSDK, keypairSigner } from 'stellar-web-sdk'

// Both credentials belong to the upstream venues. Quoting works without either — but COMMITTING a
// StellarBroker route requires the partner key, and StellarBroker often quotes best, so omitting
// it will usually strand you at step 3. Without the Soroswap key that one provider declines and
// the rest still serve the pair.
const sdk = new StellarSwapSDK({
  credentials: {
    soroswapApiKey: process.env.SOROSWAP_API_KEY,
    stellarBrokerPartnerKey: process.env.SB_PARTNER_KEY
  }
  // horizonUrl defaults to https://horizon.stellar.org; networkPassphrase defaults to PUBLIC
})

const trader = 'GTRADER…'
const signer = keypairSigner(process.env.STELLAR_SECRET!) // or your own StellarSigner (see below)

// 1) Quote — fans out to the right providers and picks the best-priced route.
const quote = await sdk.quote({
  sellAsset: 'XLM.XLM',
  buyAsset: 'XLM.USDC-GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN',
  sellAmount: '100',
  slippage: 1,           // PERCENT (1 = 1%)
  sourceAddress: trader, // destination defaults to source
})
if (!quote.route) throw new Error('no route')

// A provider that declined is NOT in `allRoutes` — `providerErrors` is the only place that says
// why. Check it whenever a provider you expected is missing.
for (const e of quote.providerErrors) console.warn(e.provider, e.errorCode, e.error)

// 2) Trustline gate — buying a classic asset the recipient doesn't trust is rejected on-chain.
const trust = await sdk.checkTrustline(trader, quote.route.buyAsset)
if (trust.required) {
  await sdk.activateTrustline(signer, quote.route.buyAsset) // submits a changeTrust, then re-quote
}

// 3) Commit against the picked provider (creates the order + returns execution + uuid).
const route = await sdk.commit({
  sellAsset: 'XLM.XLM',
  buyAsset: quote.route.buyAsset,
  sellAmount: '100',
  slippage: 1,
  sourceAddress: trader,
  provider: quote.provider!, // carry the picked provider so the price matches
})

// 4) Execute (dispatches on execution.method) and track — one call.
const { execution, track } = await sdk.executeAndTrack(route, signer, {
  callbacks: {
    onQuote: (q) => console.log('live SB quote', q.estimatedBuyingAmount),
    onProgress: (p) => console.log('progress', p),
  },
})
console.log('tracking hash', execution.inboundTxHash, 'status', track?.status)

// 5) Poll to completion.
const final = await sdk.pollTrack(route, execution.inboundTxHash, {
  onUpdate: (s) => console.log(s.status),
})

Asset identifiers

Stellar assets accept several equivalent spellings — the examples below mix them deliberately:

Form	Example
SDK canonical	`XLM.XLM`, `XLM.USDC-GA5Z…`
chain-less	`USDC-GA5Z…`
Horizon	`USDC:GA5Z…`
bare native	`XLM`, `native`

All normalize to the canonical form on the returned route. Codes are case-sensitive and are never normalized. Soroban-only (C…) tokens are not supported. Cross-chain assets are CHAIN.TICKER-ADDRESS identifiers that must come from crossChainTokens() — never hand-built.

React & Next.js

React bindings live at the stellar-web-sdk/react entry point (react >= 18 is an optional peer dependency). Everything there is 'use client' — the SDK holds live fetch/WebSocket handles, so mount it under a client boundary. The core entry (stellar-web-sdk) touches no browser globals at import time, so it's safe to import in React Server Components / the Next.js App Router.

Wrap your tree once, then drive the lifecycle with hooks:

'use client'
import { StellarSwapProvider, useQuote, useExecuteSwap } from 'stellar-web-sdk/react'
import { keypairSigner } from 'stellar-web-sdk'

// Give the provider a STABLE config (module const / useMemo) or a prebuilt `sdk` instance.
const config = { credentials: { soroswapApiKey: '…' } }

function App() {
  return (
    <StellarSwapProvider config={config}>
      <Swap />
    </StellarSwapProvider>
  )
}

function Swap() {
  const q = useQuote()                 // { quote, data, error, isLoading, reset }
  const swap = useExecuteSwap()        // commit → execute → track, + live broker state

  return (
    <>
      <button onClick={() => q.quote({ sellAsset: 'native', buyAsset: 'USDC:GA5Z…', sellAmount: '10', slippage: 1, sourceAddress: 'GTRADER…' })}>
        Quote
      </button>
      <button
        disabled={!q.data?.provider || swap.isLoading}
        onClick={() => swap.swap({
          sellAsset: 'native', buyAsset: 'USDC:GA5Z…', sellAmount: '10', slippage: 1,
          sourceAddress: 'GTRADER…', provider: q.data!.provider!, signer: keypairSigner('S…'),
        })}
      >
        {swap.isLoading ? swap.status : 'Swap'}
      </button>
      {/* broker routes stream live state: swap.brokerPhase / swap.brokerQuote / swap.brokerProgress */}
    </>
  )
}

Hooks: useStellarSwap() (the SDK from context), useQuote(), useExecuteSwap(), and useTrackStatus(route, hash?, opts?) for standalone polling. useQuote/useExecuteSwap drop superseded/aborted results, so rapid re-quoting never flashes a stale price.

Keep provider keys server-side. A NEXT_PUBLIC_ key ships to the browser. In production leave credentials unset and pass a fetch that routes provider calls through a Next.js route handler which attaches them server-side (StellarBroker WebSocket sessions still run directly from the browser). A runnable App Router example is in examples/nextjs.

Build the React entry with npm run build:all (or build:react); the default npm run build only emits the framework-agnostic core, so it stays green without React installed.

Runnable examples of the full swap flow live in examples/: vanilla JS (core SDK, no framework), React (these hooks on a plain esbuild bundle), and Next.js (App Router; its README spells out the production key-proxy route handler to replace the demo's NEXT_PUBLIC_ keys with).

Route selection policy

sdk.quote() fans out across the eligible providers and then picks the route that returns the most — the greatest expectedBuyAmount. No provider is preferred over another. See src/core/selection.ts for the implementation.

Every adapter reports expectedBuyAmount already net of the fees taken out of the traded amount, so the figures are directly comparable and the largest one is the best quote on offer. Amounts are compared as decimal strings, so no amount passes through a float.

The one caveat: an estimate is not a floor

expectedBuyAmount is the right basis for comparison but it is not a promise, and the routes are not equally certain:

Provider	`minBuyAmount`
SOROSWAP / AQUARIUS / STELLAR_DEX	enforced on-chain — the transaction fails rather than under-deliver
AXELAR_ITS	1:1 and deterministic
NEAR	contractual
STELLARBROKER	`null` — the broker re-quotes live in-session, so there is no client-verifiable floor

Two routes quoting the same amount therefore carry different guarantees. If you would rather have a guaranteed floor than the highest estimate, filter before ranking — quote() returns every route in allRoutes, and the selection helpers are exported:

import { bestByExpected } from 'stellar-web-sdk'

const q = await sdk.quote({ … })
const guaranteed = bestByExpected(q.allRoutes.filter((r) => r.minBuyAmount !== null))

Network fees are excluded from the comparison: they are additive, paid in XLM rather than the buy asset, and differ between a classic path payment and a Soroban invoke. They appear as inbound lines on route.fees.

Stellar in-chain over cross-chain (`selectUnifiedRoute`)

One preference does remain, and it is about settlement rather than price: when a pair can be served both ways, a Stellar in-chain route wins over a cross-chain one regardless of quoted output. An in-chain swap settles in a single ledger (~5s) against an enforced floor, while a cross-chain route settles over minutes across a bridge with its own failure and refund modes — different products, not competing quotes. Within each group, the best expectedBuyAmount still wins.

In practice this rarely arbitrates anything, since route discovery already sends a Stellar-native pair only to the Stellar providers. It matters mainly if you override the provider set by hand.

Recipient restriction

If destinationAddress differs from sourceAddress, discovery automatically restricts the fan-out to the recipient-capable providers (SOROSWAP, STELLAR_DEX). STELLARBROKER and AQUARIUS settle on the trader's own account and cannot pay a third party at all — this is a hard capability limit, not a preference.

Unified routing (Stellar in-chain + cross-chain NEAR)

quote()/commit()/execute() handle every path in one flow, routed automatically from the assets:

Stellar-native pair (both assets Stellar) → the four Stellar in-chain providers; best price wins.
Axelar ITS pair — the same token bridged Stellar ↔ Ethereum (XLM.XLM↔ETH.XLM-0x…, SHX↔SHX) → the AXELAR_ITS provider (a signed Stellar tx, so the normal execute() signs & submits it).
any other cross-chain pair → the NEAR provider (1Click), deposit-to-address.

You don't choose up front — read QuoteResult.crossChain. Cross-chain assets are CHAIN.TICKER-ADDRESS identifiers from each provider's catalog (crossChainTokens('NEAR' | 'AXELAR_ITS')).

// (optional) discover cross-chain assets — never hand-build identifiers.
const tokens = await sdk.crossChainTokens('NEAR')   // [{ identifier: 'ETH.ETH', decimals: 18, … }]

// 1) One quote — auto-routes. `sellAsset`/`buyAsset` are Stellar (XLM.XLM) or cross-chain (ETH.USDC-0x…).
const q = await sdk.quote({
  sellAsset: 'XLM.XLM',
  buyAsset: 'ETH.USDC-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48', // cross-chain here → NEAR
  sellAmount: '500',
  slippage: 1,                        // PERCENT
  sourceAddress: 'GTRADER…',
  destinationAddress: '0x…',          // destination-chain address (cross-chain / third-party)
})
q.crossChain   // true → routed via NEAR; false → Stellar in-chain

// 2) Commit the picked provider (refundAddress defaults to sourceAddress for cross-chain).
const route = await sdk.commit({ ...quoteParams, provider: q.provider! })

// 3) Execute — dispatches on execution.method. Stellar origin + signer signs & submits the deposit;
//    any other origin returns the deposit instruction to send yourself.
const exec = await sdk.execute(route, signer)
if (exec.method === 'transfer' && !exec.submitted) {
  // exec.deposit = { chain, depositAddress, amount, asset, attachment: { type, value } }
  // send it from your wallet, then sdk.track(route.uuid, hash)
} else {
  await sdk.track(route.uuid, exec.inboundTxHash)   // then pollTrack to completion
}

Cross-chain routes carry execution.method === 'transfer' (see TransferExecution). crossChainTokens() lists cross-chain assets and depositFor(route) returns the deposit without submitting.

Signing — the `StellarSigner` interface

Key custody stays with the caller. The SDK only ever asks for a raw ed25519 signature over specific bytes, which is enough to implement classic fee-bumps and Soroban two-phase auth signing:

export interface StellarSigner {
  readonly publicKey: string                              // G…
  sign(data: Uint8Array): Promise<Uint8Array> | Uint8Array // raw ed25519 signature (64 bytes)
}

keypairSigner(secret) wraps an in-memory S… seed. For a browser wallet or hardware device, implement the two members with your device's raw-signing primitive.

StellarBroker session safety

Execution is a direct connection: from the committed route's session parameters the SDK opens wss://api.stellar.broker/ws?partner=<key> and drives the trade against the broker itself (nothing else is in this path). The broker builds every transaction and submits it — the client only signs. Because the SDK is signing broker-authored transactions over a direct link, the signing pipeline (SigningPipeline) is the client's only defense; it runs on every tx message, in order:

Shape — each op is an InvokeHostFunction or a path payment that pays the trader (swap leg) or a trader/unset-sourced strict-send fee leg. Anything else is refused.
Trader-signature detection — a tx already carrying the trader's signature is the Soroban fee-bump round-trip. Detected by cryptographic verification, never by the 4-byte hint or signature-presence (SB's channel accounts pre-sign classic txs).
Per-tx debit budget — worst-case trader spend in the selling asset must be ≤ sellingAmount × 1.02, and at most 5 distinct debiting txs per session. This is per-tx + tx-count only, never cumulative — SB rebuilds retries on different channel accounts, so a cumulative ceiling would kill legitimate retries.
Sign — classic: fee-bump with feeSource = trader; Soroban first pass: sign each auth entry (signatureExpirationLedger = maxLedger + 1) + the inner tx, no fee-bump (the broker round-trips it); Soroban second pass: only wrap + sign the fee-bump.

On any failure after a signature, the session still returns the last signed fee-bump hash so the swap can be tracked — a partial fill may already have moved value. executeAndTrack reports it before rethrowing.

Errors

Two different things fail here, and they are reported in two different ways.

A provider declining is not an error. A quote succeeds as long as one route comes back, so a provider that declines is reported per-provider and its route is simply absent:

const q = await sdk.quote({ … })

q.allRoutes      // only the providers that answered
q.providerErrors // [{ provider: 'SOROSWAP',
                 //    errorCode: 'unknownApiError',
                 //    error: 'SOROSWAP: API key missing or invalid: Forbidden resource' }]

This is the designed behaviour, not a failed quote — but it means a missing provider is explained only in providerErrors. Reading allRoutes alone, a provider that declined is indistinguishable from one that was never asked.

Everything else throws StellarSwapError, which extends Error and carries a code to branch on, plus optional status and details:

import { StellarSwapError } from 'stellar-web-sdk'

try {
  await sdk.commit({ …, provider: q.provider! })
} catch (e) {
  if (e instanceof StellarSwapError && e.code === 'invalid_params') {
    // e.g. committing a StellarBroker route without `credentials.stellarBrokerPartnerKey`
  }
  throw e
}

Codes: invalid_config, invalid_asset, invalid_amount, invalid_params, no_route, recipient_not_supported, trustline_required, server_error, provider_error, rate_expired, signing_rejected, submit_failed, broker_session_error, broker_quote_failed, timeout, aborted, unknown.

When reporting a bug, include the code and the provider — see CONTRIBUTING.md.

API surface

new StellarSwapSDK(config?) — every field is optional: credentials (soroswapApiKey, stellarBrokerPartnerKey, nearApiJwt), validationCloud, endpoints, tunables, serviceFees, horizonUrl, networkPassphrase, brokerWsUrl, fetch, WebSocket, requestTimeoutMs.
quote(params) → { route?, provider?, crossChain, allRoutes, providerErrors, timings }
crossChainTokens(provider?) → the cross-chain asset catalog ('NEAR' default, or 'AXELAR_ITS')
checkTrustline(recipient, buyAsset) / activateTrustline(signer, asset, limit?)
commit(params) → CommittedRoute (has execution + uuid)
previewSignedTransaction(route) → fee + enforced minimum for a confirm screen
execute(route, signer?, opts?) → ExecutionResult (signer optional only for a non-Stellar-origin cross-chain route, which returns result.deposit instead of submitting)
depositFor(route) → the cross-chain deposit instruction without submitting
executeAndTrack(route, signer, opts?) → { execution, track? }
track(route, inboundTxHash?) / pollTrack(route, inboundTxHash, opts?) — reads Horizon / 1Click / Axelarscan directly; also accepts a uuid for a route committed by this instance

The routing stack is exported piece by piece, so each component can be inspected, tested or replaced without going through the SDK facade:

Adapters — quoteStellarBroker, quoteSoroswap, quoteAquarius, quoteStellarDex, quoteNear, quoteAxelar. Each is (request, context, signal) => Promise<Route>.
Discovery — discoverProviders, PROVIDER_REGISTRY, providerByName, isAxelarPair
Fan-out — runFanout, toProviderError, LocalRouter
Route construction — makeRoute, makeSignedTxExecution, makeStellarBrokerExecution, makeTransferExecution
Selection — selectRoute, selectUnifiedRoute, bestByExpected, providersForRecipient
Adapter internals — pickBestPath (STELLAR_DEX path robustness), stellarPreflight, encodeInterchainTransfer, findAxelarEntry, fetchNearTokens

Plus the tracking and execution building blocks: trackRoute, trackStellar, trackNear, trackAxelar, sumEffects, TrustlineManager, HorizonClient, SignedTransactionExecutor, TransferExecutor, StellarBrokerSession, SigningPipeline, and all asset/amount utilities.

Gotchas honored by this SDK

wss:// is required explicitly for the broker (browsers auto-upgrade https:// WS URLs; nothing else does).
Every ping is answered with pong{uid}, including while waiting for connected/quote.
Asset codes are case-sensitive end to end — never normalized.
The request's slippage is a percent; the broker's slippageTolerance is a fraction — the committed execution params are used verbatim, never converted.
Amounts are truncated (not rounded) to the 7-dp stroop grid.

Project structure

src/
  index.ts              public entry — re-exports the SDK surface
  StellarSwapSDK.ts     top-level orchestrator (quote → commit → execute → track)
  core/                 dependency-light primitives
    types.ts            public wire types (Route, quote/commit shapes)
    errors.ts           StellarSwapError + error codes
    config.ts           config resolution / defaults
    amounts.ts          stroop math (7-dp truncation)
    assets.ts           asset parsing, SB/Horizon forms, SAC derivation
    signer.ts           StellarSigner interface + keypair signer + sig helpers
    selection.ts        route selection: best expectedBuyAmount, in-chain preferred
  providers/            THE PROVIDER ADAPTERS — quote fetching + normalization
    types.ts            adapter contract, error codes, context, tunables
    http.ts             the one fetch path every adapter uses
    stellarbroker/      SB REST quote → session parameters
    soroswap/           aggregator quote + build → signed envelope
    aquarius/           AMM find-path → Soroban swap_chained invoke
    stellardex/         Horizon path-finding → pathPaymentStrictSend
    near/               1Click quote + asset catalog → deposit instruction
    axelar/             ITS catalog, GMP fee, Soroban/EVM transfer + ABI encoder
  routing/              route discovery, fan-out, construction
    registry.ts         provider table + pair classification (discovery)
    fanout.ts           parallel fan-out with two-level time budgets
    route.ts            Route + execution-block construction
    LocalRouter.ts      discovery → fan-out → solver, assembled
  tracking/             outcome tracking, per provider
    stellar.ts          Horizon transaction + effects → settled amounts
    near.ts             1Click status → three-leg cross-chain progress
    axelar.ts           Axelarscan GMP → two hub hops
  stellar/              on-chain interaction
    horizon.ts          Horizon submit, account reads, path-finding
    trustline.ts        trustline detection + changeTrust
    preflight.ts        committed-quote account/trustline pre-flight
  execution/            client-native execution engines
    signedTransaction.ts        sign + submit a server-built envelope
    stellarBroker/
      messages.ts               WebSocket protocol message shapes
      SigningPipeline.ts        the security pipeline (shape/debit/2-phase signing)
      StellarBrokerSession.ts   session driver (connect → quote → trade → settle)

bench/      routing performance harness (bench/routing.mjs)
examples/   runnable vanilla / React / Next.js apps
test/       dependency-free test suite (test/*.test.mjs)

Development

npm install
npm run build      # tsc → dist/
npm test           # builds, then runs the dependency-free test suite (test/*.test.mjs)
npm run typecheck
npm run bench      # routing performance benchmark against live venues

The tests are offline and dependency-free. They exercise the security pipeline against real XDR (classic swap-leg fee-bumps, the Soroban two-phase flow, debit-budget and shape rejections, and the full WebSocket session against a mock broker), and the routing layer against stub adapters — route discovery and its recipient restrictions, the fan-out's time budgets and error normalization, both selection rules, STELLAR_DEX path robustness, amount math, and the Axelar ABI encoding against a viem-generated reference vector.

Name		Name	Last commit message	Last commit date
Latest commit History 12 Commits
.github/ISSUE_TEMPLATE		.github/ISSUE_TEMPLATE
bench		bench
examples		examples
src		src
test		test
.gitignore		.gitignore
ARCHITECTURE.md		ARCHITECTURE.md
BENCHMARKS.md		BENCHMARKS.md
CONTRIBUTING.md		CONTRIBUTING.md
EXTERNAL_TEST_BRIEF.md		EXTERNAL_TEST_BRIEF.md
LICENSE		LICENSE
README.md		README.md
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json
tsconfig.react.json		tsconfig.react.json

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stellar-web-sdk

Contents

Install

Quick start

Asset identifiers

React & Next.js

Route selection policy

The one caveat: an estimate is not a floor

Stellar in-chain over cross-chain (`selectUnifiedRoute`)

Recipient restriction

Unified routing (Stellar in-chain + cross-chain NEAR)

Signing — the `StellarSigner` interface

StellarBroker session safety

Errors

API surface

Gotchas honored by this SDK

Project structure

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stellar-web-sdk

Contents

Install

Quick start

Asset identifiers

React & Next.js

Route selection policy

The one caveat: an estimate is not a floor

Stellar in-chain over cross-chain (selectUnifiedRoute)

Recipient restriction

Unified routing (Stellar in-chain + cross-chain NEAR)

Signing — the StellarSigner interface

StellarBroker session safety

Errors

API surface

Gotchas honored by this SDK

Project structure

Development

About

Resources

Contributing

Stars

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Forks

Releases

Packages

Contributors

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Stellar in-chain over cross-chain (`selectUnifiedRoute`)

Signing — the `StellarSigner` interface