QuotaGuard and Vercel Integration Guide

QuotaGuard Static IPs give your Vercel Serverless Functions two fixed outbound IP addresses for firewalled databases and IP-restricted APIs. Set QUOTAGUARDSTATIC_URL as a Vercel environment variable, attach the proxy to your function’s outbound calls, and every request routed through QuotaGuard exits from one of your two static IPs.

On this page

• Choosing your setup
  • Why Vercel Functions Need a Static IP
  • QuotaGuard versus Vercel native static IPs
  • QuotaGuard Static vs QuotaGuard Shield
  • Supported runtimes and Edge limitations
• Configure QuotaGuard in Vercel
  • Getting Started
  • Add your proxy environment variable
• Connection examples
  • HTTP/API requests with Node.js
  • HTTP/API requests with Python
  • SFTP from a Node.js Vercel Function
  • CRM contact creation with Node.js: HubSpot example
  • Payment API credential test with Node.js: Authorize.net example
  • Commerce API product lookup with Node.js: Naver example
  • Allowlisting for systems with unique-IP rules: Juniper example
• Verify your connection
  • Verify the HTTP client’s outbound IP
  • Verify SFTP routing
• Troubleshooting

Choosing your setup

Why Vercel Functions Need a Static IP

Vercel Serverless Functions run on ephemeral infrastructure where the outbound IP is drawn from large, rotating public cloud ranges. A database or API that only accepts requests from a known source IP will reject your function, and the address changes across deployments and invocations so you cannot simply allowlist what you see today.

Need a stable inbound route instead? QuotaGuard Inbound Proxy gives partners a stable address for reaching your Vercel application. You configure the forwarding destination and DNS in the QuotaGuard dashboard rather than adding a proxy agent to your application. See the full inbound setup guides for Static and Shield. The rest of this page covers outbound connections from Vercel.

QuotaGuard versus Vercel native static IPs

Vercel’s native Static IPs feature can be a straightforward choice for a single project. But because it is priced per project, costs can add up as you connect more applications. With QuotaGuard, multiple projects can share one subscription and the same pair of static IPs, within your plan’s usage limits. That means fewer separate static-IP charges and one consistent pair of IPs for your partners to allowlist.

QuotaGuard also keeps your outbound IPs independent of your hosting platform. Use the same pair across Vercel and other supported hosts, or keep them when you move your application elsewhere by continuing to route through QuotaGuard. You don’t have to rebuild your partners’ allowlists just because you change platforms, and our team can help you plan and configure the migration.

QuotaGuard Static vs QuotaGuard Shield

For most Vercel apps, Static is the right product. Choose QuotaGuard Shield if your functions handle HIPAA or PCI regulated data or your environment requires TLS between your app and the proxy itself. Static uses the QUOTAGUARDSTATIC_URL value from its dashboard; Shield uses QUOTAGUARDSHIELD_URL. Use the hostname, credentials, scheme, and product-specific port exactly as shown in the relevant dashboard.

Each subscription receives two IP addresses. Starter, Production, and Business subscriptions use standard addresses that may also be assigned to other subscriptions or customers. Choose Enterprise when a destination requires source IPs reserved exclusively for your subscription.

Supported runtimes and Edge limitations

Vercel Edge Functions run on a restricted runtime that does not allow arbitrary proxy agents or raw socket control. You cannot route an Edge Function through QuotaGuard directly. Move the calls that need a static IP into a Node.js Serverless Function and call that function from the edge if needed. Confirm the function that makes the external call is a Node.js Serverless Function, not an Edge Function.

Configure QuotaGuard in Vercel

Getting Started

After creating a QuotaGuard account, you are redirected to your dashboard, where you can find your proxy credentials and two static IP addresses.

Choose the right proxy region: Select the QuotaGuard region closest to your function region to minimize latency. The region is set at sign-up. Changes after sign-up require contacting support.

Add your proxy environment variable

In the Vercel dashboard, open Settings > Environment Variables, or use the CLI:

vercel env add QUOTAGUARDSTATIC_URL

Choose the deployment environment

Add the value http://username:password@<your-quotaguard-proxy-host>:9293 to the environment used by the deployment you are testing: Production, Preview (including any branch-specific settings), Development, or your custom staging environment. Confirm the variable is available in that environment; setting it for Preview alone does not establish that a separate staging environment has it.

Redeploy after environment-variable changes

After adding or changing the variable, redeploy that environment and test the resulting deployment URL. Vercel environment-variable changes apply only to new deployments.

Next, verify the HTTP client’s outbound IP before choosing a use-case example.

Connection examples

HTTP/API requests with Node.js

Vercel’s Node.js functions can use a proxy agent. Attach it to the outbound call. Setting QUOTAGUARDSTATIC_URL alone does not route traffic: configure each HTTP client, database driver, or SFTP client that needs a static IP.

// api/data.js
import { ProxyAgent } from 'undici';

const dispatcher = new ProxyAgent(process.env.QUOTAGUARDSTATIC_URL);

export default async function handler(req, res) {
  const response = await fetch('https://api.example.com/data', { dispatcher });
  const data = await response.json();
  res.status(200).json(data);
}

Creating the agent at module level lets warm invocations reuse the proxy tunnel. If your function runs only occasionally, with gaps of several minutes between calls, create the ProxyAgent inside the handler instead and await dispatcher.close() once the request is done. An idle function instance can resume holding a tunnel the proxy has already closed, and the next request on that connection fails with ECONNRESET.

If you use node-fetch rather than the built-in fetch, attach an HttpsProxyAgent instead:

import fetch from 'node-fetch';
import { HttpsProxyAgent } from 'https-proxy-agent';

const agent = new HttpsProxyAgent(process.env.QUOTAGUARDSTATIC_URL);

export default async function handler(req, res) {
  const response = await fetch('https://api.example.com/data', { agent });
  res.status(200).json(await response.json());
}

For a database or another non-HTTP TCP protocol, configure the driver to use QuotaGuard Static SOCKS5 on port 1080. Shield uses Secure SOCKS on port 1081. Do not send arbitrary TCP protocols to the HTTP proxy ports. HTTP CONNECT tunnels have a 600-second maximum lifetime, so keep an HTTP connection pool’s maximum connection lifetime below 10 minutes. SOCKS connections have no fixed lifetime cap, but they can still end during a deployment or proxy failover. Configure the client to reconnect safely.

HTTP/API requests with Python

For an existing Flask or FastAPI application on Vercel, add requests to your requirements.txt or pyproject.toml dependencies. Call this synchronous helper from an existing Flask route or synchronous FastAPI route, using your application’s normal error handling. It is a helper, not a standalone Vercel entrypoint; keep your existing supported Python application entrypoint.

import os
import requests

def fetch_partner_data():
    p = os.environ["QUOTAGUARDSTATIC_URL"]
    with requests.get(
        "https://api.example.com/data",
        proxies={"http": p, "https": p},
        timeout=(5, 15),  # connect and read timeouts, in seconds
    ) as response:
        response.raise_for_status()
        return response.json()

SFTP from a Node.js Vercel Function

In your existing server-side application, use the Node.js runtime and pass a native SOCKS5 connection to your SFTP client. Add ssh2-sftp-client and socks to the application’s dependencies; use a supported Node.js version compatible with both (for example, Node.js 22).

Keep QUOTAGUARDSTATIC_URL and separate SFTP_HOST, SFTP_PORT (optional, defaults to 22), SFTP_USERNAME, SFTP_PASSWORD, SFTP_REMOTE_PATH, SFTP_HOST_FINGERPRINT, and SFTP_EXPECTED_SHA256 environment variables server-side in Vercel. Never expose credentials in browser code or NEXT_PUBLIC_ variables. Obtain both verification values through trusted channels:

• Set SFTP_HOST_FINGERPRINT to the server administrator’s exact SHA256:... SSH host-key fingerprint, with unpadded base64 after the colon.
• Set SFTP_EXPECTED_SHA256 to the expected file digest as exactly 64 hexadecimal characters. A digest computed during download only verifies content when it is compared with a trusted expected value.

Allowlist both static IPs assigned to your QuotaGuard subscription on the SFTP server. This helper downloads one existing file and returns it as a Buffer. It rejects files larger than SFTP_MAX_BYTES, which defaults to 1 MiB, and closes an inactive socket after SFTP_TIMEOUT_MS, which defaults to 30 seconds. Call and await it inside your existing authenticated function handler, using your application’s normal error handling:

import { createHash, timingSafeEqual } from 'node:crypto';
import { SocksClient } from 'socks';
import SftpClient from 'ssh2-sftp-client';

function positiveIntegerSetting(name, fallback) {
  const text = process.env[name] || String(fallback);
  if (!/^\d+$/.test(text)) throw new Error(`${name} must be a positive integer`);
  const value = Number(text);
  if (!Number.isSafeInteger(value) || value < 1) {
    throw new Error(`${name} must be a positive integer`);
  }
  return value;
}

async function downloadVerifiedRemoteFile() {
  const proxy = new URL(process.env.QUOTAGUARDSTATIC_URL);
  const host = process.env.SFTP_HOST;
  const port = positiveIntegerSetting('SFTP_PORT', 22);
  const remotePath = process.env.SFTP_REMOTE_PATH;
  const hostFingerprint = process.env.SFTP_HOST_FINGERPRINT;
  const expectedSha256 = process.env.SFTP_EXPECTED_SHA256?.toLowerCase();
  const maxBytes = positiveIntegerSetting('SFTP_MAX_BYTES', 1024 * 1024);
  const timeoutMs = positiveIntegerSetting('SFTP_TIMEOUT_MS', 30000);

  if (!host || !remotePath || !process.env.SFTP_USERNAME
      || !process.env.SFTP_PASSWORD || !proxy.username || !proxy.password) {
    throw new Error('SFTP connection configuration is missing');
  }
  if (!/^SHA256:[A-Za-z0-9+/]+$/.test(hostFingerprint || '')) {
    throw new Error('SFTP_HOST_FINGERPRINT must use unpadded SHA256 base64');
  }
  if (!/^[a-f0-9]{64}$/.test(expectedSha256 || '')) {
    throw new Error('SFTP_EXPECTED_SHA256 must contain 64 hexadecimal characters');
  }

  const client = new SftpClient();
  let socket;
  let readStream;
  let connected = false;
  let operationError;
  try {
    ({ socket } = await SocksClient.createConnection({
      proxy: {
        host: proxy.hostname,
        port: 1080, // QuotaGuard Static SOCKS5, not the HTTP URL's port
        type: 5,
        userId: decodeURIComponent(proxy.username),
        password: decodeURIComponent(proxy.password),
      },
      command: 'connect',
      destination: { host, port },
      timeout: timeoutMs,
    }));
    socket.setTimeout(timeoutMs, () => {
      socket.destroy(new Error('SFTP socket inactivity timeout'));
    });

    // Hand the socket to the SFTP client immediately.
    await client.connect({
      host, port, sock: socket,
      username: process.env.SFTP_USERNAME,
      password: process.env.SFTP_PASSWORD,
      hostVerifier: (key) =>
        `SHA256:${createHash('sha256').update(key).digest('base64').replace(/=+$/, '')}`
          === hostFingerprint,
      readyTimeout: timeoutMs,
    });
    connected = true;

    const metadata = await client.stat(remotePath);
    if (!metadata.isFile || !Number.isSafeInteger(metadata.size)
        || metadata.size < 0 || metadata.size > maxBytes) {
      throw new Error('Remote path is not a regular file within SFTP_MAX_BYTES');
    }

    const hash = createHash('sha256');
    const chunks = [];
    let totalBytes = 0;
    readStream = client.createReadStream(remotePath, { autoClose: true });
    for await (const chunk of readStream) {
      totalBytes += chunk.length;
      if (totalBytes > maxBytes) {
        throw new Error('Remote file exceeded SFTP_MAX_BYTES while downloading');
      }
      hash.update(chunk);
      chunks.push(chunk);
    }

    const actualDigest = hash.digest();
    const expectedDigest = Buffer.from(expectedSha256, 'hex');
    if (!timingSafeEqual(actualDigest, expectedDigest)) {
      throw new Error('Downloaded file did not match SFTP_EXPECTED_SHA256');
    }
    return Buffer.concat(chunks, totalBytes);
  } catch (error) {
    operationError = error;
    throw error;
  } finally {
    readStream?.destroy();
    let cleanupError;
    try {
      if (connected) await client.end();
    } catch (error) {
      cleanupError = error;
    } finally {
      socket?.destroy();
    }
    if (!operationError && cleanupError) {
      throw new Error('SFTP cleanup failed', { cause: cleanupError });
    }
  }
}

The SFTP client’s SOCKS example documents this socket handoff; socks supports proxy username/password authentication. Keep hostVerifier: omitting it accepts unverified host keys. This example uses QuotaGuard Static’s SOCKS5 port 1080. The size check before transfer avoids known oversized files, while the streaming check also catches a file that grows or changes after the metadata request. Keep the configured maximum and the actual transfer within Vercel’s duration and memory limits.

CRM contact creation with Node.js: HubSpot example

Call this server-only helper from your existing validated form handler in a Node.js Vercel Function. Keep your form validation and anti-abuse controls. HubSpot is an illustrative CRM here; this example does not imply that HubSpot requires IP allowlisting.

Add axios and https-proxy-agent to your application’s dependencies. Keep QUOTAGUARDSTATIC_URL and HUBSPOT_ACCESS_TOKEN in server-only environment variables for the deployment you use. Use your existing bearer credential with contact-write permission (crm.objects.contacts.write); do not expose either credential to the browser. This helper uses the documented create-contact endpoint and returns the new contact’s ID.

Running this helper creates a real CRM record and may trigger configured workflows. It makes one POST without automatic retries. Pass only validated contact fields, never an upstream URL.

import axios from 'axios';
import { HttpsProxyAgent } from 'https-proxy-agent';

async function createCrmContact({ email, firstname, lastname }) {
  const proxyUrl = process.env.QUOTAGUARDSTATIC_URL;
  const token = process.env.HUBSPOT_ACCESS_TOKEN;
  if (!proxyUrl || !token) throw new Error('CRM proxy configuration is missing');

  let agent;
  try {
    agent = new HttpsProxyAgent(proxyUrl);
    const client = axios.create();
    const response = await client.post(
      'https://api.hubapi.com/crm/objects/2026-09/contacts',
      { properties: { email, firstname, lastname }, associations: [] },
      {
        adapter: 'http', // Node.js HTTP adapter, not Edge or browser fetch
        httpsAgent: agent,
        proxy: false, // the agent handles the authenticated proxy connection
        headers: { Authorization: `Bearer ${token}` },
        timeout: 15000,
        maxRedirects: 0,
      },
    );
    if (response.status !== 201 || typeof response.data?.id !== 'string'
        || !response.data.id) {
      throw new Error('Unexpected CRM response');
    }
    return response.data.id;
  } catch (error) {
    // Do not log the Axios error/config, tokens, proxy URL, or contact data.
    console.error('CRM contact request failed', {
      status: error.response?.status ?? null,
    });
    throw new Error('CRM creation was not confirmed; check the CRM before retrying');
  } finally {
    agent?.destroy();
  }
}

Handle the returned ID or sanitized error in your existing form handler. A timeout or reset leaves the write outcome uncertain: check for the contact in the CRM before retrying, including by email through your existing read access. Do not wrap this POST in automatic retry middleware.

For a read-only API-access check, use the same proxy configuration with the contacts GET: https://api.hubapi.com/crm/objects/2026-09/contacts?limit=1&properties=hs_object_id. This requires separate contact-read permission. It checks API access; use outbound-IP verification to check observed HTTP egress.

For HubSpot errors, check credentials for 401, permissions or account policy for 403 (not automatically an IP block), contact validation for 400, and provider rate limits for 429. Keep raw provider errors and form data out of browser responses and logs.

Payment API credential test with Node.js: Authorize.net example

Use this server-only helper to confirm that a Vercel Node.js Function can reach the Authorize.net sandbox through QuotaGuard Static and that the sandbox accepts an existing API Login ID and Transaction Key. Sandbox credentials are separate from production credentials. Add axios and https-proxy-agent to your application’s dependencies, then set AUTHORIZENET_API_LOGIN_ID and AUTHORIZENET_TRANSACTION_KEY as server-only Vercel environment variables alongside QUOTAGUARDSTATIC_URL.

The Authorize.net API reference requires JSON fields in the same order as its XML schema. This example preserves that order and sends authenticateTestRequest to the documented sandbox endpoint:

import axios from 'axios';
import { HttpsProxyAgent } from 'https-proxy-agent';

async function testAuthorizeNetSandboxCredentials() {
  const proxyUrl = process.env.QUOTAGUARDSTATIC_URL;
  const apiLoginId = process.env.AUTHORIZENET_API_LOGIN_ID;
  const transactionKey = process.env.AUTHORIZENET_TRANSACTION_KEY;
  if (!proxyUrl || !apiLoginId || !transactionKey) {
    throw new Error('Authorize.net sandbox configuration is missing');
  }

  let agent;
  try {
    agent = new HttpsProxyAgent(proxyUrl);
    const response = await axios.post(
      'https://apitest.authorize.net/xml/v1/request.api',
      {
        authenticateTestRequest: {
          merchantAuthentication: {
            name: apiLoginId,
            transactionKey,
          },
        },
      },
      {
        adapter: 'http',
        httpsAgent: agent,
        proxy: false,
        headers: { 'Content-Type': 'application/json' },
        timeout: 15000,
        maxRedirects: 0,
        validateStatus: () => true,
      },
    );

    if (response.status !== 200
        || response.data?.messages?.resultCode !== 'Ok') {
      throw new Error('Authorize.net sandbox credentials were not accepted');
    }
    return true;
  } catch (error) {
    // Do not log the Axios config, proxy URL, API Login ID, or Transaction Key.
    console.error('Authorize.net sandbox authentication failed', {
      status: error.response?.status ?? null,
    });
    throw new Error('Authorize.net sandbox authentication was not confirmed');
  } finally {
    agent?.destroy();
  }
}

A true result confirms that this request reached the sandbox through the configured proxy and that the sandbox accepted the supplied credentials. It does not create a transaction, test payment approval, validate production credentials, or prove that an optional transaction-IP filter will accept a production transaction. Use Authorize.net’s transaction and account guidance for those separate checks.

Commerce API product lookup with Node.js: Naver example

This server-only helper performs a read-only product search through QuotaGuard Static using an existing Naver Commerce seller access token. Although the Naver product-search endpoint uses POST, it retrieves product data and does not modify the catalog. Obtain and refresh the seller token through your existing Naver integration; this example does not provision tokens.

Add axios and https-proxy-agent to your application’s dependencies. Store NAVER_COMMERCE_ACCESS_TOKEN and NAVER_CHANNEL_PRODUCT_NO as server-only Vercel environment variables alongside QUOTAGUARDSTATIC_URL:

import axios from 'axios';
import { HttpsProxyAgent } from 'https-proxy-agent';

async function findNaverChannelProduct() {
  const proxyUrl = process.env.QUOTAGUARDSTATIC_URL;
  const token = process.env.NAVER_COMMERCE_ACCESS_TOKEN;
  const productNumberText = process.env.NAVER_CHANNEL_PRODUCT_NO;
  if (!proxyUrl || !token || !/^\d+$/.test(productNumberText || '')) {
    throw new Error('Naver Commerce configuration is missing or invalid');
  }

  const channelProductNo = Number(productNumberText);
  if (!Number.isSafeInteger(channelProductNo)) {
    throw new Error('NAVER_CHANNEL_PRODUCT_NO is outside the supported range');
  }

  let agent;
  try {
    agent = new HttpsProxyAgent(proxyUrl);
    const response = await axios.post(
      'https://api.commerce.naver.com/external/v1/products/search',
      {
        searchKeywordType: 'CHANNEL_PRODUCT_NO',
        channelProductNos: [channelProductNo],
        page: 1,
        size: 1,
      },
      {
        adapter: 'http',
        httpsAgent: agent,
        proxy: false,
        headers: {
          Accept: 'application/json;charset=UTF-8',
          Authorization: `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        timeout: 15000,
        maxRedirects: 0,
      },
    );

    if (!Array.isArray(response.data?.contents)) {
      throw new Error('Unexpected Naver Commerce response');
    }
    return response.data.contents[0] ?? null;
  } catch (error) {
    // Do not log the Axios config, token, proxy URL, or product data.
    console.error('Naver Commerce product lookup failed', {
      status: error.response?.status ?? null,
    });
    throw new Error('Naver Commerce product lookup was not confirmed');
  } finally {
    agent?.destroy();
  }
}

A product object confirms the matching product was returned through this proxied request. null means the successful search returned no matching item. Neither result proves that another Naver endpoint is allowlisted; confirm the observed source IP in Naver or destination-side logs when that evidence is required.

Allowlisting for systems with unique-IP rules: Juniper example

Some provider portals reject an IP address that is already registered to another customer account. Juniper’s IP management documentation states that an IP already present in another buyer account cannot be registered and that a newly added IP can take up to 24 hours to become effective for existing connections.

1. Copy both IP addresses for the correct subscription from the QuotaGuard dashboard and submit both to Juniper. Either address may carry a request after load balancing or failover.
2. Allow up to 24 hours for Juniper’s change to take effect before treating the registration as failed.
3. If Juniper reports that an address belongs to another buyer account, contact QuotaGuard to ask whether another standard shared pair is available. QuotaGuard can try an available pair, but cannot guarantee that Juniper will accept it.
4. If no available shared pair works, use an Enterprise subscription with dedicated IP addresses reserved for your subscription.

Standard QuotaGuard IPs are shared across subscriptions, so do not describe a standard pair as exclusive or dedicated. The Upstox static-IP guide discusses a similar unique-registration constraint, but each provider sets its own allowlisting rules.

Verify your connection

Verify the HTTP client’s outbound IP

You cannot shell into a serverless function, so test through an endpoint. Add a temporary function:

// api/verify-ip.js
import { ProxyAgent } from 'undici';

const dispatcher = new ProxyAgent(process.env.QUOTAGUARDSTATIC_URL);

export default async function handler(req, res) {
  const r = await fetch('https://ip.quotaguard.com', { dispatcher });
  res.status(200).json(await r.json());
}

Deploy to the environment configured in Configure QuotaGuard in Vercel and call that deployment’s endpoint (replace the example hostname with its deployment URL):

curl https://your-app.vercel.app/api/verify-ip

Expected JSON response, with the address in the ip field:

{"ip":"<one of your two QuotaGuard static IPs>"}

The ip value must match either of the two static IPs assigned to your subscription in the QuotaGuard dashboard. Either address is valid; repeated requests do not have to show both. Allowlist both addresses at your destination.

This verifies the HTTP request in this example.

Verify SFTP routing

It does not verify a separate SFTP connection: check the SFTP server’s connection logs, or ask its administrator to confirm the source IP of the operation made by your application through SOCKS5. A successful host-key check confirms the SSH server presented the expected key, and a successful file-digest comparison confirms the downloaded bytes match the trusted expected digest. Neither check establishes the SFTP source IP without destination-side connection evidence.

Troubleshooting

407 Proxy Authentication Required

The proxy did not receive credentials it accepts. Confirm QUOTAGUARDSTATIC_URL is present in the failing deployment and matches the QuotaGuard dashboard exactly, including the scheme, hostname, port, username, and password. Redeploy after correcting the environment variable.

Works in production, fails in preview

Confirm the variable is scoped to the failing deployment’s environment and branch, including a custom staging environment if used. Redeploy that environment after changes and test the new deployment URL.

Wrong IP returned

The proxy is not attached to the request. Confirm you passed the dispatcher or agent on the specific fetch call and that the call runs in a Node.js function, not an Edge Function.

Edge runtime error about unsupported API

You are trying to attach a proxy in an Edge Function. Move the external call to a Node.js Serverless Function.

Build-time vs runtime

Vercel exposes environment variables during builds and function execution. Server-side module-scope initialization can read them when the module loads; it is not inherently incorrect. If your framework evaluates that code during its build, the variable must also be available there. Confirm the deployment’s environment scope and redeploy after changes.

Intermittent connection resets

If requests work initially but later fail with ECONNRESET or a socket error, check whether the client tried to reuse an HTTP CONNECT tunnel after its 600-second maximum lifetime. Keep pooled HTTP connections below 10 minutes and compare a safe, read-only request through a fresh connection. On a function that is invoked infrequently, create the proxy agent inside the handler and close it after the request, as described in HTTP/API requests with Node.js. SOCKS connections do not have that fixed lifetime cap, but a deployment or proxy failover can still interrupt them. Review your HTTP client’s connection-pool settings; do not disable keep-alive across the application by default. Retry only operations that are safe to repeat, using a bounded retry policy. For payments and other non-idempotent writes, follow the destination API’s idempotency and recovery guidance before retrying. If failures continue, contact support with your client/version, timestamps, and redacted error details.

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