diff --git a/README.md b/README.md
index 2ca028a..e1d793b 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,20 @@ const stream = await fundable.flows.getStream("42");
 const withdrawable = await fundable.flows.getWithdrawableAmount("42");
 ```
 
+Create NFT-backed Flow and Lockup streams through the Router:
+
+```ts
+const lockup = await fundable.router?.createLockup({
+  sender: "G...",
+  recipient: "G...",
+  token: { address: "C...", decimals: 7 },
+  totalAmount: 1_000_000_000n,
+  startTime: new Date(),
+  endTime: new Date(Date.now() + 30 * 24 * 60 * 60 * 1_000),
+  cancelable: true,
+});
+```
+
 Read methods return decoded domain values. Flow write methods currently target
 the Flow engine contract directly and return the Stellar SDK's
 `AssembledTransaction`, preserving simulation, signing, serialization, and
diff --git a/docs/generated-bindings.md b/docs/generated-bindings.md
index 4756d8b..9642f41 100644
--- a/docs/generated-bindings.md
+++ b/docs/generated-bindings.md
@@ -67,3 +67,6 @@ pnpm generate:paymaster -- /absolute/path/to/paymaster.wasm
 
 The shared generator removes the generated `window.Buffer` mutation. All four
 bindings are compiled into the SDK behind chain-neutral high-level clients.
+
+`0.1.0-alpha.3` adds the high-level Lockup Router mapping without changing the
+generated bindings or contract artifacts, so it retains this exact provenance.
diff --git a/docs/getting-started.md b/docs/getting-started.md
index 6f8dcd4..be06564 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -44,5 +44,7 @@ const transaction = await fundable.flows.deposit({
 const result = await transaction.signAndSend();
 ```
 
-Router-based NFT creation and sponsored Paymaster execution are not yet part
-of the public SDK workflow. They remain release-roadmap items.
+Router-based NFT creation, Stream NFT reads, and sponsored Paymaster execution
+are available when their contract IDs are supplied in the client configuration.
+See [Router, Stream NFT, and Paymaster](./router-paymaster.md) for the complete
+surface.
diff --git a/docs/router-paymaster.md b/docs/router-paymaster.md
index 71d0d8b..78c3453 100644
--- a/docs/router-paymaster.md
+++ b/docs/router-paymaster.md
@@ -1,6 +1,7 @@
 # Router, Stream NFT, and Paymaster development
 
-These capabilities are available from `0.1.0-alpha.2`.
+These capabilities are available from `0.1.0-alpha.2`. Router Lockup creation
+is available from `0.1.0-alpha.3`.
 
 Configure their contract IDs to enable the optional capability groups:
 
@@ -21,7 +22,8 @@ const fundable = createFundableClient({
 
 The initial surface includes:
 
-- `router.createFlow`, `router.withdraw`, and `router.withdrawMax`;
+- `router.createFlow`, `router.createLockup`, `router.withdraw`, and
+  `router.withdrawMax`;
 - `streamNft.ownerOf`, `streamNft.balanceOf`, `streamNft.getStreamData`, and
   `streamNft.transfer`;
 - `paymaster.isFeeTokenAllowed` and bounded `paymaster.forward` calls.
@@ -29,11 +31,28 @@ The initial surface includes:
 All write methods return Stellar `AssembledTransaction` objects. Applications
 retain control over simulation, Soroban authorization, signing, and submission.
 
+`router.createLockup` accepts chain-neutral schedule values and validates the
+time range, optional cliff, unlock amounts, and granularity before simulation:
+
+```ts
+const transaction = await fundable.router?.createLockup({
+  sender: "G...",
+  recipient: "G...",
+  token: { address: "C...", decimals: 7 },
+  totalAmount: 10_000_000_000n,
+  startTime: 1_800_000_000n,
+  endTime: 1_802_592_000n,
+  cliffTime: 1_800_604_800n,
+  granularitySeconds: 3_600n,
+  cancelable: true,
+});
+```
+
 ## Testnet integration
 
 The integration suite reads Stream NFT and Paymaster state and simulates Router
-flow creation against the recorded testnet deployment without submitting a
-transaction:
+Flow and Lockup creation against the recorded testnet deployment without
+submitting a transaction:
 
 ```bash
 pnpm test:testnet
diff --git a/package.json b/package.json
index 2dbe856..6b5528c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@fundable/sdk",
-    "version": "0.1.0-alpha.2",
+    "version": "0.1.0-alpha.3",
     "private": false,
     "description": "Multichain TypeScript SDK for Fundable Protocol; Stellar adapter included",
     "license": "MIT",
diff --git a/src/core/amounts.ts b/src/core/amounts.ts
index 17e7417..a4f16c8 100644
--- a/src/core/amounts.ts
+++ b/src/core/amounts.ts
@@ -53,7 +53,10 @@ export function formatUnits(value: bigint, decimals: number): string {
   return `${negative ? "-" : ""}${whole}${fraction ? `.${fraction}` : ""}`;
 }
 
-export function toUnixSeconds(value?: bigint | Date): bigint {
+export function toUnixSeconds(
+  value?: bigint | Date,
+  label = "Start time",
+): bigint {
   if (value === undefined) {
     return 0n;
   }
@@ -61,7 +64,7 @@ export function toUnixSeconds(value?: bigint | Date): bigint {
     if (value < 0n) {
       throw new FundableError({
         code: FUNDABLE_ERROR_CODES.INVALID_ARGUMENT,
-        message: "Start time cannot be negative.",
+        message: `${label} cannot be negative.`,
       });
     }
     return value;
@@ -71,7 +74,7 @@ export function toUnixSeconds(value?: bigint | Date): bigint {
   if (!Number.isFinite(milliseconds) || milliseconds < 0) {
     throw new FundableError({
       code: FUNDABLE_ERROR_CODES.INVALID_ARGUMENT,
-      message: "Start time must be a valid date.",
+      message: `${label} must be a valid date.`,
     });
   }
   return BigInt(Math.floor(milliseconds / 1_000));
diff --git a/src/core/types.ts b/src/core/types.ts
index dc7ad1c..0cf56d1 100644
--- a/src/core/types.ts
+++ b/src/core/types.ts
@@ -49,6 +49,20 @@ export interface CreateAndDepositFlowInput extends CreateFlowInput {
   amount: bigint;
 }
 
+export interface CreateLockupInput {
+  sender: string;
+  recipient: string;
+  token: TokenReference;
+  totalAmount: bigint;
+  startTime: bigint | Date;
+  endTime: bigint | Date;
+  cliffTime?: bigint | Date;
+  startUnlockAmount?: bigint;
+  cliffUnlockAmount?: bigint;
+  granularitySeconds?: bigint;
+  cancelable?: boolean;
+}
+
 export interface FlowAmountInput {
   streamId: string | bigint;
   amount: bigint;
diff --git a/src/index.ts b/src/index.ts
index 9e546e2..fdfabf8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,5 @@
 /** Fundable Protocol multichain SDK. Stellar is the first implemented adapter. */
-export const VERSION = "0.1.0-alpha.2";
+export const VERSION = "0.1.0-alpha.3";
 
 export * from "./client.js";
 export * from "./core/index.js";
diff --git a/src/stellar/protocol-clients.test.ts b/src/stellar/protocol-clients.test.ts
index e687e40..40fb242 100644
--- a/src/stellar/protocol-clients.test.ts
+++ b/src/stellar/protocol-clients.test.ts
@@ -4,6 +4,7 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
 
 const generated = vi.hoisted(() => ({
   createFlow: vi.fn(),
+  createLockup: vi.fn(),
   getStreamData: vi.fn(),
   forward: vi.fn(),
 }));
@@ -11,6 +12,7 @@ const generated = vi.hoisted(() => ({
 vi.mock("../generated/router/src/index.js", () => ({
   Client: class {
     create_flow_stream = generated.createFlow;
+    create_lockup_stream = generated.createLockup;
   },
 }));
 
@@ -79,6 +81,70 @@ describe("Stellar protocol clients", () => {
     );
   });
 
+  it("routes validated Lockup creation through the Router contract", async () => {
+    const sender = Keypair.random().publicKey();
+    const recipient = Keypair.random().publicKey();
+    const token = contractId(2);
+    generated.createLockup.mockResolvedValue({ result: 10n });
+    const client = new StellarRouterClient({
+      ...baseConfig,
+      contracts: { ...baseConfig.contracts, router: contractId(1) },
+    });
+
+    await client.createLockup({
+      sender,
+      recipient,
+      token: { address: token, decimals: 7 },
+      totalAmount: 100n,
+      startTime: 1_000n,
+      endTime: 2_000n,
+      cliffTime: 1_200n,
+      startUnlockAmount: 10n,
+      cliffUnlockAmount: 20n,
+      granularitySeconds: 60n,
+      cancelable: true,
+    });
+
+    expect(generated.createLockup).toHaveBeenCalledWith(
+      {
+        params: {
+          sender,
+          recipient,
+          token,
+          total_amount: 100n,
+          start_time: 1_000n,
+          end_time: 2_000n,
+          cliff_time: 1_200n,
+          start_unlock_amount: 10n,
+          cliff_unlock_amount: 20n,
+          granularity: 60n,
+          cancelable: true,
+        },
+      },
+      undefined,
+    );
+  });
+
+  it("rejects invalid Lockup schedules before contract simulation", async () => {
+    const sender = Keypair.random().publicKey();
+    const client = new StellarRouterClient({
+      ...baseConfig,
+      contracts: { ...baseConfig.contracts, router: contractId(1) },
+    });
+
+    await expect(
+      client.createLockup({
+        sender,
+        recipient: Keypair.random().publicKey(),
+        token: { address: contractId(2), decimals: 7 },
+        totalAmount: 100n,
+        startTime: 2_000n,
+        endTime: 1_000n,
+      }),
+    ).rejects.toThrow("End time must be later than start time");
+    expect(generated.createLockup).not.toHaveBeenCalled();
+  });
+
   it("normalizes Stream NFT metadata", async () => {
     generated.getStreamData.mockResolvedValue({ result: [0, 42n] });
     const client = new StellarStreamNftClient({
diff --git a/src/stellar/router-client.ts b/src/stellar/router-client.ts
index 9ffde33..55231eb 100644
--- a/src/stellar/router-client.ts
+++ b/src/stellar/router-client.ts
@@ -1,10 +1,17 @@
-import type { CreateFlowInput, RouterWithdrawInput } from "../core/index.js";
-import { toUnixSeconds } from "../core/index.js";
+import {
+  FUNDABLE_ERROR_CODES,
+  FundableError,
+  toUnixSeconds,
+  type CreateFlowInput,
+  type CreateLockupInput,
+  type RouterWithdrawInput,
+} from "../core/index.js";
 import { Client as GeneratedRouterClient } from "../generated/router/src/index.js";
 import type { StellarFundableClientConfig, StellarMethodOptions } from "./types.js";
 import type { StellarTransaction } from "./flow-client.js";
 import {
   assertPositive,
+  assertNonNegative,
   assertStellarAddress,
   assertTokenDecimals,
   toTokenId,
@@ -49,6 +56,76 @@ export class StellarRouterClient {
     );
   }
 
+  async createLockup(
+    input: CreateLockupInput,
+    options?: StellarMethodOptions,
+  ): Promise<StellarTransaction<bigint>> {
+    assertStellarAddress(input.sender, "Sender");
+    assertStellarAddress(input.recipient, "Recipient");
+    assertStellarAddress(input.token.address, "Token");
+    assertTokenDecimals(input.token.decimals, "Lockup token decimals");
+    assertPositive(input.totalAmount, "Total amount");
+
+    if (input.sender === input.recipient) {
+      throw new FundableError({
+        code: FUNDABLE_ERROR_CODES.INVALID_ARGUMENT,
+        message: "Sender and recipient must be different addresses.",
+        chain: "stellar",
+      });
+    }
+
+    const startTime = toUnixSeconds(input.startTime, "Start time");
+    const endTime = toUnixSeconds(input.endTime, "End time");
+    const cliffTime = toUnixSeconds(input.cliffTime, "Cliff time");
+    const startUnlockAmount = input.startUnlockAmount ?? 0n;
+    const cliffUnlockAmount = input.cliffUnlockAmount ?? 0n;
+    const granularity = input.granularitySeconds ?? 1n;
+
+    if (endTime <= startTime) {
+      throw new FundableError({
+        code: FUNDABLE_ERROR_CODES.INVALID_ARGUMENT,
+        message: "End time must be later than start time.",
+        chain: "stellar",
+      });
+    }
+    if (cliffTime > 0n && (cliffTime <= startTime || cliffTime >= endTime)) {
+      throw new FundableError({
+        code: FUNDABLE_ERROR_CODES.INVALID_ARGUMENT,
+        message: "Cliff time must be later than start time and earlier than end time.",
+        chain: "stellar",
+      });
+    }
+    assertNonNegative(startUnlockAmount, "Start unlock amount");
+    assertNonNegative(cliffUnlockAmount, "Cliff unlock amount");
+    assertPositive(granularity, "Granularity");
+    if (startUnlockAmount + cliffUnlockAmount > input.totalAmount) {
+      throw new FundableError({
+        code: FUNDABLE_ERROR_CODES.INVALID_ARGUMENT,
+        message: "Start and cliff unlock amounts cannot exceed the total amount.",
+        chain: "stellar",
+      });
+    }
+
+    return this.client.create_lockup_stream(
+      {
+        params: {
+          sender: input.sender,
+          recipient: input.recipient,
+          token: input.token.address,
+          total_amount: input.totalAmount,
+          start_time: startTime,
+          end_time: endTime,
+          cliff_time: cliffTime,
+          start_unlock_amount: startUnlockAmount,
+          cliff_unlock_amount: cliffUnlockAmount,
+          granularity,
+          cancelable: input.cancelable ?? false,
+        },
+      },
+      options,
+    );
+  }
+
   async withdraw(
     input: RouterWithdrawInput,
     options?: StellarMethodOptions,
diff --git a/src/stellar/testnet.integration.test.ts b/src/stellar/testnet.integration.test.ts
index b28ca66..c641b7d 100644
--- a/src/stellar/testnet.integration.test.ts
+++ b/src/stellar/testnet.integration.test.ts
@@ -64,4 +64,22 @@ describe.runIf(runIntegration)("Fundable tagged testnet deployment", () => {
 
     expect(transaction?.result).toEqual(expect.any(BigInt));
   });
+
+  it("simulates Router Lockup creation without submitting a transaction", async () => {
+    const startTime = BigInt(Math.floor(Date.now() / 1_000) + 30);
+    const transaction = await client.router?.createLockup({
+      sender: deployment.admin,
+      recipient: Keypair.random().publicKey(),
+      token: {
+        address: Asset.native().contractId(Networks.TESTNET),
+        decimals: 7,
+      },
+      totalAmount: 1n,
+      startTime,
+      endTime: startTime + 3_600n,
+      granularitySeconds: 1n,
+    });
+
+    expect(transaction?.result).toEqual(expect.any(BigInt));
+  });
 });
diff --git a/src/stellar/validation.ts b/src/stellar/validation.ts
index dfdab97..2efcca7 100644
--- a/src/stellar/validation.ts
+++ b/src/stellar/validation.ts
@@ -65,6 +65,16 @@ export function assertPositive(value: bigint, label: string): void {
   }
 }
 
+export function assertNonNegative(value: bigint, label: string): void {
+  if (value < 0n) {
+    throw new FundableError({
+      code: FUNDABLE_ERROR_CODES.INVALID_ARGUMENT,
+      message: `${label} cannot be negative.`,
+      chain: "stellar",
+    });
+  }
+}
+
 export function assertTokenDecimals(value: number, label = "Token decimals"): void {
   if (!Number.isInteger(value) || value < 0 || value > 18) {
     throw new FundableError({