diff --git a/.changeset/hungry-monkeys-wonder.md b/.changeset/hungry-monkeys-wonder.md
new file mode 100644
index 000000000..dbf6aa213
--- /dev/null
+++ b/.changeset/hungry-monkeys-wonder.md
@@ -0,0 +1,7 @@
+---
+'@siafoundation/walletd-js': minor
+'@siafoundation/walletd-react': minor
+'@siafoundation/walletd-types': minor
+---
+
+Added construct APIs for both v1 and v2 transactions.
diff --git a/.changeset/perfect-turtles-kiss.md b/.changeset/perfect-turtles-kiss.md
new file mode 100644
index 000000000..75a64a9a0
--- /dev/null
+++ b/.changeset/perfect-turtles-kiss.md
@@ -0,0 +1,7 @@
+---
+'@siafoundation/walletd-js': minor
+'@siafoundation/walletd-react': minor
+'@siafoundation/walletd-types': minor
+---
+
+Added the basis ChainIndex parameter to txpool broadcast API.
diff --git a/.changeset/tiny-deers-wink.md b/.changeset/tiny-deers-wink.md
new file mode 100644
index 000000000..4d78cd964
--- /dev/null
+++ b/.changeset/tiny-deers-wink.md
@@ -0,0 +1,7 @@
+---
+'@siafoundation/walletd-js': minor
+'@siafoundation/walletd-react': minor
+'@siafoundation/walletd-types': minor
+---
+
+Added the basis ChainIndex parameter to fund APIs.
diff --git a/.changeset/tricky-carrots-deny.md b/.changeset/tricky-carrots-deny.md
new file mode 100644
index 000000000..6fba0fa3f
--- /dev/null
+++ b/.changeset/tricky-carrots-deny.md
@@ -0,0 +1,7 @@
+---
+'@siafoundation/walletd-js': minor
+'@siafoundation/walletd-react': minor
+'@siafoundation/walletd-types': minor
+---
+
+Added the basis ChainIndex value to txpool transactions response.
diff --git a/apps/walletd/contexts/addresses/dataset.tsx b/apps/walletd/contexts/addresses/dataset.tsx
index d9d95f1ff..9af2c7fc6 100644
--- a/apps/walletd/contexts/addresses/dataset.tsx
+++ b/apps/walletd/contexts/addresses/dataset.tsx
@@ -19,8 +19,8 @@ export function transformAddressesResponse(
     const datum: AddressData = {
       id: address,
       address,
-      description: description,
-      spendPolicy: spendPolicy,
+      description,
+      spendPolicy,
       metadata: (metadata || {}) as WalletAddressMetadata,
       walletId,
       onClick: () =>
diff --git a/apps/walletd/contexts/addresses/types.ts b/apps/walletd/contexts/addresses/types.ts
index 7f2ed661d..4eee497a9 100644
--- a/apps/walletd/contexts/addresses/types.ts
+++ b/apps/walletd/contexts/addresses/types.ts
@@ -2,6 +2,7 @@ import {
   WalletAddress,
   WalletAddressMetadata,
 } from '@siafoundation/walletd-types'
+import { SpendPolicy } from '@siafoundation/types'
 
 export type CellContext = {
   siascanUrl: string
@@ -11,7 +12,7 @@ export type AddressData = {
   id: string
   address: string
   description?: string
-  spendPolicy?: string
+  spendPolicy?: SpendPolicy
   metadata: WalletAddressMetadata
   walletId: string
   raw?: WalletAddress
diff --git a/apps/walletd/dialogs/WalletSendLedgerDialog/useFundAndSign.tsx b/apps/walletd/dialogs/WalletSendLedgerDialog/useFundAndSign.tsx
index 91ec45d09..9c9598671 100644
--- a/apps/walletd/dialogs/WalletSendLedgerDialog/useFundAndSign.tsx
+++ b/apps/walletd/dialogs/WalletSendLedgerDialog/useFundAndSign.tsx
@@ -1,4 +1,4 @@
-import { Transaction } from '@siafoundation/types'
+import { ChainIndex, Transaction } from '@siafoundation/types'
 import { useCallback } from 'react'
 import { SendParams } from '../_sharedWalletSend/types'
 
@@ -7,6 +7,7 @@ type Props = {
     fundedTransaction?: Transaction
     toSign?: string[]
     error?: string
+    basis?: ChainIndex
   }>
   cancel: (transaction: Transaction) => Promise<void>
   sign: ({
@@ -28,6 +29,7 @@ export function useFundAndSign({ fund, cancel, sign }: Props) {
         fundedTransaction,
         toSign,
         error: fundingError,
+        basis,
       } = await fund(params)
       if (fundingError) {
         return {
@@ -47,6 +49,7 @@ export function useFundAndSign({ fund, cancel, sign }: Props) {
         }
       }
       return {
+        basis,
         signedTransaction,
       }
     },
diff --git a/apps/walletd/dialogs/WalletSendLedgerDialog/useSendForm.tsx b/apps/walletd/dialogs/WalletSendLedgerDialog/useSendForm.tsx
index 24c375351..b30549e36 100644
--- a/apps/walletd/dialogs/WalletSendLedgerDialog/useSendForm.tsx
+++ b/apps/walletd/dialogs/WalletSendLedgerDialog/useSendForm.tsx
@@ -10,7 +10,7 @@ import {
 } from '@siafoundation/design-system'
 import { DeviceConnectForm } from '../DeviceConnectForm'
 import { useLedger } from '../../contexts/ledger'
-import { Transaction } from '@siafoundation/types'
+import { Transaction, ChainIndex } from '@siafoundation/types'
 import { LedgerSignTxn } from './LedgerSignTxn'
 import { useSign } from './useSign'
 import { useBroadcast } from '../_sharedWalletSend/useBroadcast'
@@ -69,10 +69,12 @@ export function useSendForm({ params, step, onConfirm }: Props) {
   const fundAndSign = useFundAndSign({ cancel, fund, sign })
   const [waitingForUser, setWaitingForUser] = useState(false)
   const [txn, setTxn] = useState<Transaction>()
+  const [basis, setBasis] = useState<ChainIndex>()
 
   useEffect(() => {
     if (step === 'compose') {
       setTxn(undefined)
+      setBasis(undefined)
     }
   }, [step])
 
@@ -109,8 +111,17 @@ export function useSendForm({ params, step, onConfirm }: Props) {
         return
       }
 
+      if (!txn) {
+        return
+      }
+
+      if (!basis) {
+        return
+      }
+
       const { error } = await broadcast({
         signedTransaction: txn,
+        basis,
       })
 
       if (error) {
@@ -124,7 +135,7 @@ export function useSendForm({ params, step, onConfirm }: Props) {
         // transactionId,
       })
     },
-    [broadcast, txn, onConfirm]
+    [broadcast, txn, basis, onConfirm]
   )
 
   const onInvalid = useOnInvalid(fields)
@@ -136,11 +147,12 @@ export function useSendForm({ params, step, onConfirm }: Props) {
 
   const runFundAndSign = useCallback(async () => {
     setWaitingForUser(true)
-    const { signedTransaction, error } = await fundAndSign(params)
+    const { signedTransaction, error, basis } = await fundAndSign(params)
     if (error) {
       triggerErrorToast({ title: error })
     } else {
       setTxn(signedTransaction)
+      setBasis(basis)
       form.setValue('isSigned', true)
     }
     setWaitingForUser(false)
diff --git a/apps/walletd/dialogs/WalletSendSeedDialog/useSignAndBroadcast.tsx b/apps/walletd/dialogs/WalletSendSeedDialog/useSignAndBroadcast.tsx
index dbf71af8b..c49676d91 100644
--- a/apps/walletd/dialogs/WalletSendSeedDialog/useSignAndBroadcast.tsx
+++ b/apps/walletd/dialogs/WalletSendSeedDialog/useSignAndBroadcast.tsx
@@ -49,6 +49,7 @@ export function useSignAndBroadcast() {
         fundedTransaction,
         toSign,
         error: fundingError,
+        basis,
       } = await fund(params)
       if (fundingError) {
         return {
@@ -77,7 +78,7 @@ export function useSignAndBroadcast() {
       cacheWalletMnemonic(walletId, mnemonic)
 
       // broadcast
-      return broadcast({ signedTransaction })
+      return broadcast({ signedTransaction, basis })
     },
     [
       cancel,
diff --git a/apps/walletd/dialogs/_sharedWalletSend/useBroadcast.tsx b/apps/walletd/dialogs/_sharedWalletSend/useBroadcast.tsx
index 6d2ba1cc3..1497e998f 100644
--- a/apps/walletd/dialogs/_sharedWalletSend/useBroadcast.tsx
+++ b/apps/walletd/dialogs/_sharedWalletSend/useBroadcast.tsx
@@ -1,4 +1,4 @@
-import { Transaction } from '@siafoundation/types'
+import { Transaction, ChainIndex } from '@siafoundation/types'
 import { useTxPoolBroadcast } from '@siafoundation/walletd-react'
 import { useCallback } from 'react'
 
@@ -6,7 +6,13 @@ export function useBroadcast({ cancel }: { cancel: (t: Transaction) => void }) {
   const txPoolBroadcast = useTxPoolBroadcast()
 
   const broadcast = useCallback(
-    async ({ signedTransaction }: { signedTransaction: Transaction }) => {
+    async ({
+      signedTransaction,
+      basis,
+    }: {
+      signedTransaction: Transaction
+      basis: ChainIndex
+    }) => {
       if (!signedTransaction) {
         return {
           error: 'No signed transaction',
@@ -15,6 +21,7 @@ export function useBroadcast({ cancel }: { cancel: (t: Transaction) => void }) {
       // broadcast
       const broadcastResponse = await txPoolBroadcast.post({
         payload: {
+          basis,
           transactions: [signedTransaction],
           v2transactions: [],
         },
diff --git a/apps/walletd/dialogs/_sharedWalletSend/useFund.tsx b/apps/walletd/dialogs/_sharedWalletSend/useFund.tsx
index 4077756b2..3b6d03138 100644
--- a/apps/walletd/dialogs/_sharedWalletSend/useFund.tsx
+++ b/apps/walletd/dialogs/_sharedWalletSend/useFund.tsx
@@ -54,6 +54,7 @@ export function useFund() {
           }
         }
         return {
+          basis: fundResponse.data.basis,
           fundedTransaction: fundResponse.data.transaction,
           toSign: fundResponse.data.toSign,
         }
@@ -103,6 +104,7 @@ export function useFund() {
         }
         toSign.push(...fundResponse.data.toSign)
         return {
+          basis: fundResponse.data.basis,
           fundedTransaction: fundResponse.data.transaction,
           toSign,
         }
diff --git a/apps/walletd/lib/signLedger.spec.ts b/apps/walletd/lib/signLedger.spec.ts
index 06336b748..4ab745ccb 100644
--- a/apps/walletd/lib/signLedger.spec.ts
+++ b/apps/walletd/lib/signLedger.spec.ts
@@ -17,8 +17,8 @@ describe('signLedger', () => {
           device,
           transaction: mocks.walletFundResponse.transaction,
           toSign: mocks.walletFundResponse.toSign,
-          siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-          siafundOutputs: mocks.walletOutputsSiafundResponse,
+          siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+          siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
           addresses: getMockAddresses(mocks),
         })
       ).toMatchSnapshot()
@@ -31,8 +31,8 @@ describe('signLedger', () => {
         await signTransactionLedger({
           device,
           transaction: mocks.walletFundResponse.transaction,
-          siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-          siafundOutputs: mocks.walletOutputsSiafundResponse,
+          siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+          siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
           addresses: getMockAddresses(mocks),
           toSign: [mocks.walletFundResponse.toSign[0], 'not in siacoinOutputs'],
         })
@@ -49,8 +49,8 @@ describe('signLedger', () => {
           device,
           transaction: mocks.walletFundResponse.transaction,
           toSign: mocks.walletFundResponse.toSign,
-          siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-          siafundOutputs: mocks.walletOutputsSiafundResponse,
+          siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+          siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
           addresses: [
             {
               id: 'id',
@@ -75,14 +75,15 @@ describe('signLedger', () => {
           device,
           transaction: mocks.walletFundResponse.transaction,
           toSign: mocks.walletFundResponse.toSign,
-          siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-          siafundOutputs: mocks.walletOutputsSiafundResponse,
+          siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+          siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
           addresses: [
             {
               id: 'id',
               walletId: 'id',
               address:
-                mocks.walletOutputsSiacoinResponse[1].siacoinOutput.address,
+                mocks.walletOutputsSiacoinResponse.outputs[1].siacoinOutput
+                  .address,
               metadata: {},
             },
           ],
@@ -102,8 +103,8 @@ describe('signLedger', () => {
           device,
           transaction: mocks.walletFundResponse.transaction,
           toSign: mocks.walletFundResponse.toSign,
-          siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-          siafundOutputs: mocks.walletOutputsSiafundResponse,
+          siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+          siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
           addresses,
         })
       ).toEqual({
diff --git a/apps/walletd/lib/signSeed.spec.ts b/apps/walletd/lib/signSeed.spec.ts
index b6e05d5fa..fccd46874 100644
--- a/apps/walletd/lib/signSeed.spec.ts
+++ b/apps/walletd/lib/signSeed.spec.ts
@@ -17,8 +17,8 @@ describe('signSeed', () => {
         toSign: mocks.walletFundResponse.toSign,
         consensusState: mocks.consensusState,
         consensusNetwork: mocks.consensusNetwork,
-        siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-        siafundOutputs: mocks.walletOutputsSiafundResponse,
+        siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+        siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
         addresses: getMockAddresses(mocks),
       })
     ).toMatchSnapshot()
@@ -32,8 +32,8 @@ describe('signSeed', () => {
         transaction: mocks.walletFundResponse.transaction,
         consensusState: mocks.consensusState,
         consensusNetwork: mocks.consensusNetwork,
-        siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-        siafundOutputs: mocks.walletOutputsSiafundResponse,
+        siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+        siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
         addresses: getMockAddresses(mocks),
         toSign: ['not in siacoinOutputs'],
       })
@@ -51,8 +51,8 @@ describe('signSeed', () => {
         toSign: mocks.walletFundResponse.toSign,
         consensusState: mocks.consensusState,
         consensusNetwork: mocks.consensusNetwork,
-        siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-        siafundOutputs: mocks.walletOutputsSiafundResponse,
+        siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+        siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
         addresses: [
           {
             id: 'id',
@@ -78,8 +78,8 @@ describe('signSeed', () => {
         toSign: mocks.walletFundResponse.toSign,
         consensusState: mocks.consensusState,
         consensusNetwork: mocks.consensusNetwork,
-        siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-        siafundOutputs: mocks.walletOutputsSiafundResponse,
+        siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+        siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
         addresses: [
           {
             id: 'id',
@@ -106,8 +106,8 @@ describe('signSeed', () => {
         toSign: mocks.walletFundResponse.toSign,
         consensusState: mocks.consensusState,
         consensusNetwork: mocks.consensusNetwork,
-        siacoinOutputs: mocks.walletOutputsSiacoinResponse,
-        siafundOutputs: mocks.walletOutputsSiafundResponse,
+        siacoinOutputs: mocks.walletOutputsSiacoinResponse.outputs,
+        siafundOutputs: mocks.walletOutputsSiafundResponse.outputs,
         addresses,
       })
     ).toEqual({
diff --git a/libs/types/src/v2.ts b/libs/types/src/v2.ts
index 3d613a5a2..0b5c17d9a 100644
--- a/libs/types/src/v2.ts
+++ b/libs/types/src/v2.ts
@@ -11,9 +11,13 @@ import {
   SiafundOutput,
   Signature,
   StateElement,
+  UnlockConditions,
 } from './core'
 
-export type SpendPolicy = string
+export type SpendPolicy = {
+  type: 'uc'
+  policy: UnlockConditions
+}
 
 export type V2SiacoinInput = {
   parent: SiacoinElement
diff --git a/libs/walletd-js/src/index.ts b/libs/walletd-js/src/index.ts
index 87cb5dd73..dee23fc93 100644
--- a/libs/walletd-js/src/index.ts
+++ b/libs/walletd-js/src/index.ts
@@ -47,6 +47,12 @@ import {
   WalletBalanceParams,
   WalletBalancePayload,
   WalletBalanceResponse,
+  WalletConstructV1TransactionParams,
+  WalletConstructV1TransactionPayload,
+  WalletConstructV1TransactionResponse,
+  WalletConstructV2TransactionParams,
+  WalletConstructV2TransactionPayload,
+  WalletConstructV2TransactionResponse,
   WalletDeleteParams,
   WalletDeletePayload,
   WalletDeleteResponse,
@@ -93,6 +99,8 @@ import {
   walletsIdAddressesAddrRoute,
   walletsIdAddressesRoute,
   walletsIdBalanceRoute,
+  walletsIdConstructTransactionRoute,
+  walletsIdConstructV2TransactionRoute,
   walletsIdEventsRoute,
   walletsIdEventsUnconfirmedRoute,
   walletsIdFundRoute,
@@ -245,5 +253,15 @@ export function Walletd({ api, password }: { api: string; password?: string }) {
       WalletReleasePayload,
       WalletReleaseResponse
     >(axios, 'post', walletsIdReleaseRoute),
+    walletConstructV1Transaction: buildRequestHandler<
+      WalletConstructV1TransactionParams,
+      WalletConstructV1TransactionPayload,
+      WalletConstructV1TransactionResponse
+    >(axios, 'post', walletsIdConstructTransactionRoute),
+    walletConstructV2Transaction: buildRequestHandler<
+      WalletConstructV2TransactionParams,
+      WalletConstructV2TransactionPayload,
+      WalletConstructV2TransactionResponse
+    >(axios, 'post', walletsIdConstructV2TransactionRoute),
   }
 }
diff --git a/libs/walletd-mock/src/scenarios/seedWallet.ts b/libs/walletd-mock/src/scenarios/seedWallet.ts
index 9b0a6e380..05bd4304f 100644
--- a/libs/walletd-mock/src/scenarios/seedWallet.ts
+++ b/libs/walletd-mock/src/scenarios/seedWallet.ts
@@ -1,9 +1,11 @@
-import { SiacoinElement, SiafundElement } from '@siafoundation/types'
 import {
   Wallet,
   WalletAddress,
   WalletBalanceResponse,
+  WalletConstructV2TransactionResponse,
   WalletFundSiacoinResponse,
+  WalletOutputsSiacoinResponse,
+  WalletOutputsSiafundResponse,
 } from '@siafoundation/walletd-types'
 import { toHastings } from '@siafoundation/units'
 import { getMockConsensusNetworkResponse } from '../mocks/consensusNetwork'
@@ -37,53 +39,69 @@ export function getMockScenarioSeedWallet() {
     siafunds: 10,
   }
 
-  const walletOutputsSiacoinResponse: SiacoinElement[] = [
-    {
-      id: 'aa3e781330c9b3991e0141807df1327fadf114ca6c37acb9e58004f942d91dfb',
-      leafIndex: 304248,
-      merkleProof: [
-        '0a7a4c392f78899e3c38c5cd9e6a673b2c7afec97930af539af9c8e20209aa78',
-        'a1e074dc48634a234b7366a0d7ab19cd05e3e698e1d44bf07e24d75ae0c65b3c',
-        '44d107342962e2068d289ce090c87b7bf0c847f734bdfad10db5546e402c3ad7',
-        '64ea3e65ecd5ebc1c0ce014673148060855ce550571208b6303b8e2a83e33451',
-        '19e37bf7747c6d8c7b87d2474dbbd3a8f5b26d89642f8e1af4b9b02abdfb2ea6',
-        '1fc2ac9f70211a3be6f334db14feb8b327458aee49d3539770640cbdec9b4a5f',
-        'defbbc18c64349f11e75537955861ececce0fadf10baec456f6c74b024820af1',
-        '87d27ff868ca3b1dce59ae754eaec48239718e81e2e6f3b7b418f5a00362bcf7',
-        '93d823c55fbd09de462a8e355921433b3693d63de58ea8e2780a2c2ffabd0fee',
-        'a68820d6b79b2735b15c69d0fc26b11252bb27f22b9088559ed13f9420f5dda1',
-        '1bbcead690290291ea9628214a121ef783411693975171803bf5716a3a6ff19b',
-      ],
-      siacoinOutput: {
-        value: '1000000000000000000000000',
-        address:
-          'f2dbf56b5b0c698d7fbf43f646c76169d84e597e8b37fada97348beeecaa812d400ac4ce7981',
-      },
-      maturityHeight: 0,
+  const walletOutputsSiacoinResponse: WalletOutputsSiacoinResponse = {
+    basis: {
+      height: 0,
+      id: '0',
     },
-    {
-      id: '32e430158591b4073a6834e9f4c4b67162e348844f569f4e472896bb72efb724',
-      leafIndex: 305723,
-      merkleProof: [
-        '8c02aeec48de589ce497ebe72fb8b527cfe022ef513fcfdc56745c84832f00ec',
-        '1bf63b9959e60272fd7a48a8cecd4120a852c0e14557ea27ccad6ea2071e70b3',
-        '21b7e1606e9fd677059c58a1a687682182f71ce09e071431dcaff823a3a5d49e',
-        'e81ac37d3b4db6166dc1bb10ebfa49f57cbf99aababd36ee4e3e5e12082dc6dc',
-        'ecc307c6c3e505d97ccf821938e5e5702ef0130d33c991ca95735f7d9706a4b8',
-        '9560060ee399793f102e092afdfdbdd33692706256955e8390af552de0addfc0',
-      ],
-      siacoinOutput: {
-        value: '97988210000000000000000000',
-        address:
-          'f2dbf56b5b0c698d7fbf43f646c76169d84e597e8b37fada97348beeecaa812d400ac4ce7981',
+    outputs: [
+      {
+        id: 'aa3e781330c9b3991e0141807df1327fadf114ca6c37acb9e58004f942d91dfb',
+        leafIndex: 304248,
+        merkleProof: [
+          '0a7a4c392f78899e3c38c5cd9e6a673b2c7afec97930af539af9c8e20209aa78',
+          'a1e074dc48634a234b7366a0d7ab19cd05e3e698e1d44bf07e24d75ae0c65b3c',
+          '44d107342962e2068d289ce090c87b7bf0c847f734bdfad10db5546e402c3ad7',
+          '64ea3e65ecd5ebc1c0ce014673148060855ce550571208b6303b8e2a83e33451',
+          '19e37bf7747c6d8c7b87d2474dbbd3a8f5b26d89642f8e1af4b9b02abdfb2ea6',
+          '1fc2ac9f70211a3be6f334db14feb8b327458aee49d3539770640cbdec9b4a5f',
+          'defbbc18c64349f11e75537955861ececce0fadf10baec456f6c74b024820af1',
+          '87d27ff868ca3b1dce59ae754eaec48239718e81e2e6f3b7b418f5a00362bcf7',
+          '93d823c55fbd09de462a8e355921433b3693d63de58ea8e2780a2c2ffabd0fee',
+          'a68820d6b79b2735b15c69d0fc26b11252bb27f22b9088559ed13f9420f5dda1',
+          '1bbcead690290291ea9628214a121ef783411693975171803bf5716a3a6ff19b',
+        ],
+        siacoinOutput: {
+          value: '1000000000000000000000000',
+          address:
+            'f2dbf56b5b0c698d7fbf43f646c76169d84e597e8b37fada97348beeecaa812d400ac4ce7981',
+        },
+        maturityHeight: 0,
       },
-      maturityHeight: 0,
-    },
-  ]
+      {
+        id: '32e430158591b4073a6834e9f4c4b67162e348844f569f4e472896bb72efb724',
+        leafIndex: 305723,
+        merkleProof: [
+          '8c02aeec48de589ce497ebe72fb8b527cfe022ef513fcfdc56745c84832f00ec',
+          '1bf63b9959e60272fd7a48a8cecd4120a852c0e14557ea27ccad6ea2071e70b3',
+          '21b7e1606e9fd677059c58a1a687682182f71ce09e071431dcaff823a3a5d49e',
+          'e81ac37d3b4db6166dc1bb10ebfa49f57cbf99aababd36ee4e3e5e12082dc6dc',
+          'ecc307c6c3e505d97ccf821938e5e5702ef0130d33c991ca95735f7d9706a4b8',
+          '9560060ee399793f102e092afdfdbdd33692706256955e8390af552de0addfc0',
+        ],
+        siacoinOutput: {
+          value: '97988210000000000000000000',
+          address:
+            'f2dbf56b5b0c698d7fbf43f646c76169d84e597e8b37fada97348beeecaa812d400ac4ce7981',
+        },
+        maturityHeight: 0,
+      },
+    ],
+  }
 
-  const walletOutputsSiafundResponse: SiafundElement[] = []
+  const walletOutputsSiafundResponse: WalletOutputsSiafundResponse = {
+    basis: {
+      height: 0,
+      id: '0',
+    },
+    outputs: [],
+  }
 
   const walletFundResponse: WalletFundSiacoinResponse = {
+    basis: {
+      height: 0,
+      id: '0',
+    },
     transaction: {
       siacoinInputs: [
         {
@@ -126,6 +144,84 @@ export function getMockScenarioSeedWallet() {
     dependsOn: null,
   }
 
+  const walletConstructV2Response: WalletConstructV2TransactionResponse = {
+    id: '0',
+    basis: {
+      height: 0,
+      id: '0',
+    },
+    transaction: {
+      siacoinInputs: [
+        {
+          parent: {
+            id: 'aa3e781330c9b3991e0141807df1327fadf114ca6c37acb9e58004f942d91dfb',
+            maturityHeight: 0,
+            siacoinOutput: {
+              value: '1000000000000000000000000',
+              address:
+                '90c6057cdd2463eca61f83796e83152dbba28b6cb9a74831a043833051ec9f422726bfff2ee8',
+            },
+            leafIndex: 304248,
+            merkleProof: [
+              '0a7a4c392f78899e3c38c5cd9e6a673b2c7afec97930af539af9c8e20209aa78',
+              'a1e074dc48634a234b7366a0d7ab19cd05e3e698e1d44bf07e24d75ae0c65b3c',
+            ],
+          },
+          satisfiedPolicy: {
+            policy: {
+              type: 'uc',
+              policy: {
+                timelock: 0,
+                publicKeys: null,
+                signaturesRequired: 1,
+              },
+            },
+          },
+        },
+        {
+          parent: {
+            id: '32e430158591b4073a6834e9f4c4b67162e348844f569f4e472896bb72efb724',
+            maturityHeight: 0,
+            siacoinOutput: {
+              value: '97984280000000000000000000',
+              address:
+                'f2dbf56b5b0c698d7fbf43f646c76169d84e597e8b37fada97348beeecaa812d400ac4ce7981',
+            },
+            leafIndex: 305723,
+            merkleProof: [
+              '8c02aeec48de589ce497ebe72fb8b527cfe022ef513fcfdc56745c84832f00ec',
+              '1bf63b9959e60272fd7a48a8cecd4120a852c0e14557ea27ccad6ea2071e70b3',
+            ],
+          },
+          satisfiedPolicy: {
+            policy: {
+              type: 'uc',
+              policy: {
+                timelock: 0,
+                publicKeys: null,
+                signaturesRequired: 1,
+              },
+            },
+          },
+        },
+      ],
+      siacoinOutputs: [
+        {
+          value: '1000000000000000000000000',
+          address:
+            '90c6057cdd2463eca61f83796e83152dbba28b6cb9a74831a043833051ec9f422726bfff2ee8',
+        },
+        {
+          value: '97984280000000000000000000',
+          address:
+            'f2dbf56b5b0c698d7fbf43f646c76169d84e597e8b37fada97348beeecaa812d400ac4ce7981',
+        },
+      ],
+      minerFee: '3930000000000000000000',
+    },
+    estimatedFee: '0',
+  }
+
   const walletAddressesResponse: WalletAddress[] = [
     {
       address:
@@ -185,6 +281,7 @@ export function getMockScenarioSeedWallet() {
     walletOutputsSiacoinResponse,
     walletOutputsSiafundResponse,
     walletFundResponse,
+    walletConstructV2Response,
     walletAddressesResponse,
   }
 }
diff --git a/libs/walletd-react/src/api.ts b/libs/walletd-react/src/api.ts
index e81660ce4..8a43cad0a 100644
--- a/libs/walletd-react/src/api.ts
+++ b/libs/walletd-react/src/api.ts
@@ -51,6 +51,12 @@ import {
   WalletAddressesResponse,
   WalletBalanceParams,
   WalletBalanceResponse,
+  WalletConstructV1TransactionParams,
+  WalletConstructV1TransactionPayload,
+  WalletConstructV1TransactionResponse,
+  WalletConstructV2TransactionParams,
+  WalletConstructV2TransactionPayload,
+  WalletConstructV2TransactionResponse,
   WalletDeleteParams,
   WalletDeletePayload,
   WalletDeleteResponse,
@@ -92,6 +98,8 @@ import {
   walletsIdAddressesAddrRoute,
   walletsIdAddressesRoute,
   walletsIdBalanceRoute,
+  walletsIdConstructTransactionRoute,
+  walletsIdConstructV2TransactionRoute,
   walletsIdEventsRoute,
   walletsIdEventsUnconfirmedRoute,
   walletsIdFundRoute,
@@ -460,3 +468,23 @@ export function useWalletRelease(
 ) {
   return usePostFunc({ ...args, route: walletsIdReleaseRoute })
 }
+
+export function useWalletConstructV1Transaction(
+  args?: HookArgsCallback<
+    WalletConstructV1TransactionParams,
+    WalletConstructV1TransactionPayload,
+    WalletConstructV1TransactionResponse
+  >
+) {
+  return usePostFunc({ ...args, route: walletsIdConstructTransactionRoute })
+}
+
+export function useWalletConstructV2Transaction(
+  args?: HookArgsCallback<
+    WalletConstructV2TransactionParams,
+    WalletConstructV2TransactionPayload,
+    WalletConstructV2TransactionResponse
+  >
+) {
+  return usePostFunc({ ...args, route: walletsIdConstructV2TransactionRoute })
+}
diff --git a/libs/walletd-types/src/api.ts b/libs/walletd-types/src/api.ts
index 6dc9eaac0..6c12b98db 100644
--- a/libs/walletd-types/src/api.ts
+++ b/libs/walletd-types/src/api.ts
@@ -11,6 +11,10 @@ import {
   Transaction,
   V2Transaction,
   WalletEvent,
+  SiacoinOutput,
+  Address,
+  SiafundOutput,
+  TransactionID,
 } from '@siafoundation/types'
 import { GatewayPeer, Wallet, WalletAddress, WalletMetadata } from './types'
 
@@ -37,6 +41,10 @@ export const walletsIdFundRoute = '/wallets/:id/fund'
 export const walletsIdFundSfRoute = '/wallets/:id/fundsf'
 export const walletsIdReserveRoute = '/wallets/:id/reserve'
 export const walletsIdReleaseRoute = '/wallets/:id/release'
+export const walletsIdConstructTransactionRoute =
+  '/wallets/:id/construct/transaction'
+export const walletsIdConstructV2TransactionRoute =
+  '/wallets/:id/construct/v2/transaction'
 
 // state
 
@@ -79,6 +87,7 @@ export type SyncerConnectResponse = never
 export type TxPoolTransactionsParams = void
 export type TxPoolTransactionsPayload = void
 export type TxPoolTransactionsResponse = {
+  basis: ChainIndex
   transactions: Transaction[]
   v2transactions: V2Transaction[]
 }
@@ -89,6 +98,7 @@ export type TxPoolFeeResponse = Currency
 
 export type TxPoolBroadcastParams = void
 export type TxPoolBroadcastPayload = {
+  basis: ChainIndex
   transactions: Transaction[]
   v2transactions: V2Transaction[]
 }
@@ -188,6 +198,7 @@ export type WalletFundSiacoinPayload = {
   changeAddress: string
 }
 export type WalletFundSiacoinResponse = {
+  basis: ChainIndex
   transaction: Transaction
   toSign: string[]
   dependsOn: Transaction[] | null
@@ -203,6 +214,7 @@ export type WalletFundSiafundPayload = {
   claimAddress: string
 }
 export type WalletFundSiafundResponse = {
+  basis: ChainIndex
   transaction: Transaction
   toSign: string[]
   dependsOn: Transaction[] | null
@@ -226,3 +238,34 @@ export type WalletReleasePayload = {
   siafundOutputs?: SiafundOutputID[]
 }
 export type WalletReleaseResponse = void
+
+export type WalletConstructV1TransactionParams = {
+  id: string
+}
+export type WalletConstructV1TransactionPayload = {
+  siacoins?: SiacoinOutput[]
+  siafunds?: SiafundOutput[]
+  changeAddress: Address
+}
+
+export type WalletConstructV1TransactionResponse = {
+  basis: ChainIndex
+  id: TransactionID
+  transaction: Transaction
+  estimatedFee: Currency
+}
+
+export type WalletConstructV2TransactionParams = {
+  id: string
+}
+export type WalletConstructV2TransactionPayload = {
+  siacoins?: SiacoinOutput[]
+  siafunds?: SiafundOutput[]
+  changeAddress: Address
+}
+export type WalletConstructV2TransactionResponse = {
+  basis: ChainIndex
+  id: TransactionID
+  transaction: V2Transaction
+  estimatedFee: Currency
+}