Postman Through a US Mobile Egress: Hourly, Dedicated

Postman already has a proxy setting. What it does not have is a US phone network to put behind it. If the API you are testing behaves differently for US clients, applies rate limiting per address, or lives behind an allowlist you want to prove, the missing piece is a real carrier address that is yours alone for the length of the test. HourlyProxies rents exactly that: one dedicated 4G or 5G line, $2 or $3 for the first two hours, extendable to four, with no subscription waiting at the end.

Setting Postman's proxy to the line

In Postman's settings, switch off the system proxy, add a custom proxy with the HTTP endpoint and port from your dashboard, and tick both HTTP and HTTPS. Send a request to any address echo service and confirm the response shows a carrier address in the city you chose. From there every request in the workspace leaves through the line until you switch it off. Newman, Postman's command-line runner, picks up the standard HTTPS_PROXY variable for the same effect in CI.

If your API uses certificate pinning or mutual TLS, Postman's certificate settings still apply; the proxy only changes where the connection comes from.

Postman environments make the comparison tidy. Keep one environment for your usual network and one for the line, with the base URL and the region string you expect in each, and let the collection's test scripts flag any response that differs. The list of failures is your list of behaviors that depend on where the client sits.

Three tests worth two hours

First, geography. An API that returns US-only products, US pricing or US-formatted dates is best tested from a US address, and a mobile one is as authentic as it gets. Run the collection and compare the responses with the ones you get from your desk.

Second, allowlists and per-address limits. Fire the collection from the line and confirm that an endpoint restricted to your office range refuses it, and that the rate limiting you built responds per address the way your documentation promises. Because the address is used only by you, the counters you read are clean.

Third, mobile network behavior. Carrier NAT, higher latency and occasional reconnects are what your mobile app users live with. Postman's response times through the line are a cheap preview of that, and long-polling or streaming endpoints show their rough edges here first.

A long collection can straddle a carrier reconnect, and the address may change when it does. For a clean measurement leave rotation alone, and if a single request fails with a connection reset, rerun it before concluding that the API is at fault. Real phones see the same resets, so a client that retries gracefully is a good outcome of the test.

Monitors and mock servers

Postman monitors run from Postman's cloud and cannot use your proxy, but Newman can. Schedule a Newman run on a machine that routes through the line and you have a US-mobile monitor for as long as the line lasts. Mock servers work in the other direction: call them through the line to confirm that a client on a US phone network reaches the mock and gets the example response you expect.

The meter, plainly

4G: $2 for the first two hours, then $2 per hour. 5G: $3 and $3. Four hours per purchase at most, never renewed automatically. If the test runs on into the evening the hours already paid count toward the $5 or $6 day price. Each line is a real SIM in hardware we own in a US city, carrying one customer's traffic, with unlimited data under fair use, HTTP(S) and SOCKS5, free rotation and free city moves. 4G usually gives 20 to 45 Mbps and 5G 50 Mbps and up, depending on signal.

• Custom proxy in Postman, HTTPS_PROXY for Newman
• Geo, allowlist and rate limit checks from one clean address
• Latency numbers that look like a real phone
• Nothing to cancel afterwards

On fair use and good manners

Test APIs you own or are authorized to test. Do not hammer a third-party endpoint or rotate addresses to get past a limit someone else set. Our fair-use rule covers bulk transfer, and our acceptable-use policy covers attacks and abuse; both apply to Postman runs as much as anything else.

Setting up a Postman proxy on HourlyProxies

1. Buy two hours on 4G or 5G in the city your users are in.
2. Enter the HTTP endpoint as a custom proxy in Postman's settings.
3. Send a request to an address echo service to confirm the carrier address.
4. Run the collection and diff the responses against your usual network.
5. Switch the proxy off when you are done; the line expires on its own.

Postman proxy questions