diff --git a/lib/nostr.js b/lib/nostr.js
index 7e17340e..077e658b 100644
--- a/lib/nostr.js
+++ b/lib/nostr.js
@@ -29,7 +29,7 @@ export const RELAYS_BLACKLIST = []
  * @property {function(Object, {privKey: string, signer: NDKSigner}): Promise<NDKEvent>} sign
  * @property {function(Object, {relays: Array<string>, privKey: string, signer: NDKSigner}): Promise<NDKEvent>} publish
  */
-export class Nostr {
+export default class Nostr {
   /**
    * @type {NDK}
    */
@@ -153,11 +153,6 @@ export class Nostr {
   }
 }
 
-/**
- * @type {Nostr}
- */
-export default new Nostr()
-
 export function hexToBech32 (hex, prefix = 'npub') {
   return bech32.encode(prefix, bech32.toWords(Buffer.from(hex, 'hex')))
 }
diff --git a/wallets/nwc/client.js b/wallets/nwc/client.js
index 74691edc..f6fc3829 100644
--- a/wallets/nwc/client.js
+++ b/wallets/nwc/client.js
@@ -1,4 +1,4 @@
-import { getNwc, supportedMethods, nwcTryRun } from '@/wallets/nwc'
+import { supportedMethods, nwcTryRun } from '@/wallets/nwc'
 export * from '@/wallets/nwc'
 
 export async function testSendPayment ({ nwcUrl }, { signal }) {
@@ -9,8 +9,6 @@ export async function testSendPayment ({ nwcUrl }, { signal }) {
 }
 
 export async function sendPayment (bolt11, { nwcUrl }, { signal }) {
-  const nwc = await getNwc(nwcUrl, { signal })
-  // TODO: support AbortSignal
-  const result = await nwcTryRun(() => nwc.payInvoice(bolt11))
+  const result = await nwcTryRun(nwc => nwc.payInvoice(bolt11), { nwcUrl }, { signal })
   return result.preimage
 }
diff --git a/wallets/nwc/index.js b/wallets/nwc/index.js
index 7ec94241..3d0e212c 100644
--- a/wallets/nwc/index.js
+++ b/wallets/nwc/index.js
@@ -36,8 +36,8 @@ export const card = {
   subtitle: 'use Nostr Wallet Connect for payments'
 }
 
-export async function getNwc (nwcUrl, { signal }) {
-  const ndk = Nostr.ndk
+async function getNwc (nwcUrl, { signal }) {
+  const ndk = new Nostr().ndk
   const { walletPubkey, secret, relayUrls } = parseNwcUrl(nwcUrl)
   const nwc = new NDKNwc({
     ndk,
@@ -65,20 +65,32 @@ export async function getNwc (nwcUrl, { signal }) {
  * @param {function} fun - the nwc function to run
  * @returns - the result of the nwc function
  */
-export async function nwcTryRun (fun) {
+export async function nwcTryRun (fun, { nwcUrl }, { signal }) {
+  let nwc
   try {
-    const { error, result } = await fun()
+    nwc = await getNwc(nwcUrl, { signal })
+    const { error, result } = await fun(nwc)
     if (error) throw new Error(error.message || error.code)
     return result
   } catch (e) {
     if (e.error) throw new Error(e.error.message || e.error.code)
     throw e
+  } finally {
+    if (nwc) close(nwc)
+  }
+}
+
+/**
+ * Close all relay connections of the NDKNwc instance
+ * @param {NDKNwc} nwc
+ */
+async function close (nwc) {
+  for (const relay of nwc.relaySet.relays) {
+    nwc.ndk.pool.removeRelay(relay.url)
   }
 }
 
 export async function supportedMethods (nwcUrl, { signal }) {
-  const nwc = await getNwc(nwcUrl, { signal })
-  // TODO: support AbortSignal
-  const result = await nwcTryRun(() => nwc.getInfo())
+  const result = await nwcTryRun(nwc => nwc.getInfo(), { nwcUrl }, { signal })
   return result.methods
 }
diff --git a/wallets/nwc/server.js b/wallets/nwc/server.js
index b9cc8fd5..6fb4c82c 100644
--- a/wallets/nwc/server.js
+++ b/wallets/nwc/server.js
@@ -1,4 +1,4 @@
-import { getNwc, supportedMethods, nwcTryRun } from '@/wallets/nwc'
+import { supportedMethods, nwcTryRun } from '@/wallets/nwc'
 export * from '@/wallets/nwc'
 
 export async function testCreateInvoice ({ nwcUrlRecv }, { signal }) {
@@ -21,8 +21,9 @@ export async function testCreateInvoice ({ nwcUrlRecv }, { signal }) {
 }
 
 export async function createInvoice ({ msats, description, expiry }, { nwcUrlRecv }, { signal }) {
-  const nwc = await getNwc(nwcUrlRecv, { signal })
-  // TODO: support AbortSignal
-  const result = await nwcTryRun(() => nwc.sendReq('make_invoice', { amount: msats, description, expiry }))
+  const result = await nwcTryRun(
+    nwc => nwc.sendReq('make_invoice', { amount: msats, description, expiry }),
+    { nwcUrl: nwcUrlRecv }, { signal }
+  )
   return result.invoice
 }