An in-depth look at Proxies.sx - real carrier 4G/5G mobile and residential proxies, billed per GB with traffic that never expires, plus the first proxy network AI agents can buy themselves with USDC. Primary keywords: mobile proxies, 4G 5G proxies, residential proxies, rotating proxies, pay as you go proxies, sticky session proxies, x402 proxies, proxies for AI agents
1. THE SHORT VERSION
Proxies.sx is a mobile and residential proxy network built around one simple idea: you pay only for the gigabytes you actually use, and that traffic never expires.There is no monthly subscription, no per-port rental, and no “use it or lose it” clock on your balance. Top up once, and your GB sit there until you spend them.
Underneath that simple billing model is a serious network: real carrier 4G and 5G mobile IPs on physical modems, a residential pool that spans dozens of countries and keeps growing, a single gateway that speaks both HTTP and SOCKS5, and a username-based control language that lets you pick country, carrier, city, ASN, IP type, and rotation behaviour without ever opening a dashboard. The network is expanding continuously - new countries and carriers are added all the time - so the live availability shown in your dashboard is always the authoritative, up-to-the-minute list.
And there is one thing Proxies.sx does that no legacy provider does: it lets an autonomous AI agent discover, pay for, and start using a proxy entirely on its own, using stablecoin micropayments (USDC) over the x402 protocol. No human, no signup form, no credit card. For the wave of AI agents now browsing and buying on the open web, Proxies.sx is built to be the proxy they reach for first.
This guide walks through the whole system - the network, the pricing, how you connect, how rotation and targeting work, the automation surface, and who it is (and is not) the right tool for.
2. WHO PROXIES.SX IS FOR
Proxies.sx fits people and teams who needtrustworthy IPs and hate wasting money on idle subscriptions:
· Web scraping and data collection teams who want realmobile and residential exits
that survive modern anti-bot stacks, billedby usage rather than by seat.
· Multi-account andantidetect-browser users (AdsPower, Dolphin, GoLogin, and similar) who need astable, sticky IP per profile.
· Ad verification, SERP and pricemonitoring, and brand-protection workflows that need to see the web as a realuser in a specific country or on a specific carrier.
· Social media managers andmarketplace sellers who need clean, high-trust mobile IPs.
· Sneaker, ticketing, andrelease-day automation that lives or dies on IP reputation.
· AI builders and agentdevelopers who want their code to buy its own proxy through an API or an MCPtool, paying in USDC with no account setup.
If your use case is occasional or bursty - afew GB this week, nothing next week - the pay-as-you-go, never-expires model isdramatically cheaper than renting ports or paying a monthly minimum you willnot fully use.
3. THE NETWORK: REAL CARRIER MOBILE, PLUS RESIDENTIAL
Proxies.sx runs two complementary pools.
Dedicated 4G/5G mobile (the premium tier)
• Real physical modems on real carrier SIMs from major mobile operators - not datacenter ranges dressed up as mobile. • Carrier-grade mobile IPs sit behind operator NAT, which is exactly why they earn the highest trust scores with anti-fraud systems: thousands of real subscribers share the same egress ranges, so blocking them means blocking real customers. • The mobile fleet covers the United States, the United Kingdom, and core European markets today, with new countries and carriers added on an ongoing basis. Stock changes daily, so the live per-country and per-carrier availability inside your Proxies.sx dashboard at https://client.proxies.sx is always the authoritative, current list - what you see there is what is online right now.
Residential and community pool
• A broader pool of residential and mobile exits spanning dozens of countries across every region, useful when you need presence in a market the dedicated mobile fleet does not yet cover. New countries and networks appear here continuously. • Selectable by country, and where available by carrier, city, ASN, and ISP. You choose which pool you want per request (see the username language in section 5), so you can route premium work to dedicated mobile and long-tail geos to the wider pool, all from one account and one balance. The full, current catalogue of countries and carriers is always live in your dashboard at https://client.proxies.sx, because the network grows every week and a static list would only go out of date.\
4. PRICING: $4 PER GB, NEVER EXPIRES, PORTS ARE FREE
This is the part most people remember. • $4 per GB, pay as you go. You are billed for the bandwidth you use - nothing else. • Traffic never expires. Buy GB once and use them whenever, over weeks or months. • Ports and sessions are free. You are not charged per port, per IP, or per seat. Spin up as many as your tier allows and only the GB cost anything. • Automatic volume discounts as you scale, so heavier buyers pay less per GB.
• You can start tiny. Through the AI agent payment route, purchases begin at $0.40 (0.1 GB), which makes Proxies.sx one of the cheapest ways to test real mobile IPs before committing. Compared with the subscription model most large providers use - where you commit to a monthly minimum and forfeit unused traffic - the never-expires balance means a dollar you spend is a dollar of usable proxy, today or three months from now.
5. TWO WAYS TO CONNECT (AND ONE SIMPLE USERNAME LANGUAGE)
You can connect through a dedicated port or through the pool gateway. Most users should start with the pool gateway - it is more resilient and far more flexible.
THE POOL GATEWAY
• One endpoint, both protocols: HTTP: gw.proxies.sx:7000 SOCKS5: gw.proxies.sx:7001
• You control everything through the username. The format is: psx_--[- …]
- pool: mbl (dedicated mobile) | peer (residential/community) | any | best
• country: 2-letter ISO code (us, gb, de, fr, …) or “any” Then add optional tokens, in any order, to shape the connection: Token Example What it does sid -sid-myprofile1 Session name. Keep the SAME IP across connections rot -rot-auto10 Rotation behaviour (see section 6) carrier -carrier- Soft carrier match (any operator in the pool) city -city-newyork Soft city match iptype -iptype-mobile Hard filter: mobile | residential | datacenter isp -isp-spectrum Hard ISP match asn -asn-7018 Hard ASN match (exact) Example - a sticky US mobile session for an antidetect profile, over SOCKS5: curl -x socks5://psx_YOURID-mbl-us-sid-profile1-rot-sticky:[email protected]:7001 \ https://api.ipify.org Example - two parallel scraper threads, each pinned to its own US mobile IP at the same time (just give each a different sid): Thread 1: psx_YOURID-mbl-us-sid-worker1-rot-auto10 Thread 2: psx_YOURID-mbl-us-sid-worker2-rot-auto10 Because every token lives in the username, you can drive country, carrier, and rotation entirely from your code or your antidetect browser - no dashboard round trips, no API calls just to switch geos.
DEDICATED PORTS
• Prefer a classic host:port:user:pass line bound to a single modem? You can create dedicated ports from the dashboard, each with its own credentials, and target a specific device. Ports support the same rotation and OS-fingerprint controls.
A separate “proxy password”
• Your proxy credentials are independent from your account login. You can rotate the proxy password at any time without touching your dashboard password, so leaked proxy credentials never put your account at risk. Accounts also support 2FA.
6. ROTATION AND STICKY SESSIONS - EXACTLY HOW IT BEHAVES
Proxies.sx is precise and honest about rotation, which matters because mobile IPs behave differently from datacenter IPs.
Mode Behaviour
sticky Pin the session to one modem for as long as you hold the sid auto5 Soft-rotate to a fresh exit every 5 minutes auto10 Every 10 minutes (the default) auto20 Every 20 minutes auto60 Every 60 minutes ondemand Re-pick a new exit on each new connection sticky-strict A stricter pin that prefers the most IP-stable endpoints Two things worth understanding (both work as designed):
- Sticky pins the MODEM, not the IP. Mobile carriers re-issue NAT egress IPs on their own schedule, so even a perfectly pinned modem can show a new exit IP across short calls. If you need the SAME exit IP held for a long workflow (cookies, login sessions), use a residential exit or a dedicated modem on a static plan. This is the nature of mobile networks, and Proxies.sx tells you up front rather than pretending otherwise.
- Stickiness needs a session name. Always pass -sid- when you want a connection to “stick”. Without a sid, each connection gets a fresh short-lived session. There is also a public, token-based rotation endpoint, so you can force a fresh IP from a script or a webhook without logging in.
7. TARGETING AND ADVANCED CONTROLS
Beyond country, you can narrow exits with real precision:
- Carrier targeting: match a specific mobile operator where stock exists.
- City targeting: soft-match a metro area.
- ASN and ISP targeting: hard-match an exact network (for example, ASN 7018) when your target only trusts a particular provider.
- IP-type filtering: force mobile, residential, or datacenter exits.
- Live stock visibility: public per-country and per-carrier stock counts let you see what is actually available before you buy - no guessing, and (importantly) no exposure of the underlying exit IPs.
OS FINGERPRINT SPOOFING
Proxies.sx can rewrite the TCP/IP fingerprint of your traffic at the network level (p0f-style), so the operating system your packets advertise matches the device you are pretending to be - Windows, macOS, iOS, or Android. The chosen fingerprint is preserved across rotations, which keeps long-running automation consistent.
8. BUILT FOR AUTOMATION: API, MCP, AND THE x402 AI-AGENT RAIL
This is where Proxies.sx pulls ahead of the field. A real API with scoped keys Everything you can do in the dashboard you can do over a REST API: create and rotate ports, read usage and billing, manage your account. API keys are scoped (ports:read, ports:rotate, billing:read, and so on), so you can hand automation a key that does exactly one job and nothing more. MCP for AI coding assistants Proxies.sx ships an MCP (Model Context Protocol) integration, so AI assistants and agent frameworks can manage proxies as a native tool - list stock, buy GB, spin up a session - without bespoke glue code. x402: the proxy an AI agent buys by itself This is the headline feature for the agentic era. Using the open x402 standard (HTTP 402 Payment Required), an autonomous agent can:
- Ask Proxies.sx for a proxy with no account and no payment.
- Receive a 402 response describing the price and accepted networks.
- Pay in USDC on-chain - on Base or on Solana.
- Retry with the transaction hash and immediately receive working credentials. Settlement is fast enough to sit inside an agent’s loop: roughly 2 seconds on Base and around 400 milliseconds on Solana. Purchases start at $0.40. The agent can buy a single dedicated port or full pool-gateway access, top up mid-task, replace a bad exit, and check its remaining balance - all programmatically, all paid in stablecoin. Why this matters: the AI agents now shopping, researching, and transacting across the web need infrastructure they can acquire without a human in the loop. Legacy proxy providers are built around signup forms, sales calls, and card-on-file billing - none of which an agent can complete. Proxies.sx is built the other way around. The full agent hub, skill files, and live examples live at https://agents.proxies.sx.
9. FOR BUSINESSES: WHITE-LABEL RESELLER AND AFFILIATE PROGRAMS
Resell under your own brand Proxies.sx has a full reseller platform. You get sub-accounts, your own pricing (margin, multiplier, or fixed), quota controls, real-time webhooks for the full port and customer lifecycle, revenue analytics, and a dedicated portal. There is an open-source white-label kit, so you can stand up a branded proxy business on top of the network - you mint customer keys, Proxies.sx runs the modems, relays, and gateway. Earn as an affiliate A straightforward affiliate program pays 20% on a referral’s first purchase and 10% recurring on everything they spend afterwards, for the life of the account. Because traffic never expires and customers keep topping up, that recurring 10% compounds.
10. PAYMENTS AND GETTING STARTED
Ways to pay
• Card, via Stripe. • Crypto, via hosted checkout: BTC, ETH, LTC, USDT, and USDC. • USDC micropayments on Base or Solana, via x402 (for the agent route). Tip for crypto top-ups: send on a network the checkout supports (for example USDT on TRC20 or ERC20). Sending on an unsupported network can strand funds. From zero to first request in about three minutes:
- Create an account at https://client.proxies.sx and (optional) enable 2FA.
- Top up your balance - start with as little as $10 (2.5 GB) to test.
- Set your proxy password in the Account section.
- Connect through the gateway with your username string, for example: curl -x http://psx_YOURID-mbl-us-sid-test1:[email protected]:7000 \ https://api.ipify.org
- Confirm the exit IP and country, then point your scraper, antidetect browser, or app at the same endpoint. That is the whole flow. No subscription to cancel later, and the GB you bought stay yours until you use them.
11. HONEST PROS AND CONS
What makes Proxies.sx stand out
• Pay-as-you-go at $4/GB with traffic that never expires - no wasted subscription. • Real carrier 4G/5G mobile on live operator SIMs, not mislabeled datacenter ranges. • One gateway, both HTTP and SOCKS5, with a powerful username control language. • Precise targeting: country, carrier, city, ASN, ISP, and IP type. • Free ports and sessions; you only pay for bandwidth. • A real API, MCP support, and the x402 rail that lets AI agents self-serve. • White-label reseller platform and a recurring affiliate program. • Refreshingly honest documentation about how mobile rotation actually behaves.
Things to keep in mind
• Dedicated carrier-grade mobile is strongest in the US, UK, and core EU today and expanding; some long-tail countries are served by the broader residential/community pool, whose performance varies by exit. The live per-country and per-carrier stock in your dashboard always reflects what is online right now, so check it before you commit rather than relying on any fixed list. • Like all mobile proxies, sticky pins the modem, not the IP. For a single held exit IP across a long session, use a residential exit or a dedicated static-plan modem. • It is usage-metered only. If you specifically want flat-rate unlimited dedicated modems, that is a different product (ask about partner options).
12. THE VERDICT
Proxies.sx is one of the most honest and flexible proxy services you can buy right now. The pay-as-you-go, never-expires model removes the single biggest waste in the proxy market - paying for bandwidth you do not use - and the network behind it is the real thing: carrier 4G/5G mobile plus residential, controlled through a clean username language and a genuine API. For scrapers, multi-account operators, and verification teams it is an easy recommendation, especially if your usage is bursty. And it is one of the very few networks already built for what is coming next: proxies that an AI agent can find, pay for in stablecoin, and start using entirely on its own. If you are building agents, that alone is worth a look.
13. WHY MOBILE PROXIES WIN: IP TRUST AND MODERN ANTI-BOT
Not all proxies are equal, and the difference comes down to one thing the big anti-bot vendors obsess over: IP trust. Understanding it explains why a mobile IP from Proxies.sx gets through where a cheap datacenter IP is blocked on the first request.
Datacenter IPs are the bottom of the trust ladder. They belong to hosting providers, their ranges are publicly known, and systems like Cloudflare, DataDome, Akamai, and HUMAN flag them instantly. Fast and cheap, and blocked everywhere that matters.
Residential IPs are a big step up. They come from real home internet connections, so they look like ordinary users, and they are the workhorse of serious data collection.
Mobile IPs are the top of the ladder, and it is not close. A 4G or 5G mobile IP sits behind carrier-grade NAT, which means hundreds or thousands of real phone users share the same public IP at the same time. An anti-bot system cannot ban that IP without also banning a crowd of genuine paying mobile customers, so it does not - it extends mobile IPs the benefit of the doubt. That is exactly why the dedicated 4G/5G mobile exits on the Proxies.sx network at https://proxies.sx are the right tool for the hardest targets: sites fronted by DataDome and Cloudflare that reset datacenter and many residential connections before a page even finishes loading.
One honest and important point Proxies.sx is upfront about: blocking that is decided purely on IP reputation cannot be undone by browser stealth, fingerprint spoofing, or rotation tricks - only the exit IP itself matters there. That is the entire argument for using genuine carrier mobile rather than a dressed-up datacenter range. Get the IP layer right and the rest of your stack has a chance; get it wrong and nothing else saves you.
14. USE CASES IN DEPTH
Web scraping and data collection The core use case. Real mobile and residential exits survive the anti-bot stacks that kill datacenter proxies, and per-GB billing means a job that runs an hour a week does not pay for a month of idle bandwidth. Pair sticky sessions with per-thread session names to run many parallel workers, each on its own stable IP. Open an account at https://client.proxies.sx, start with a few dollars, and scale only once the job proves out.
Multi-account management and antidetect browsers Tools like WADE X, AdsPower, Dolphin Anty, GoLogin, Multilogin, and Incogniton expect one clean, stable IP per profile. Proxies.sx pairs perfectly: give each browser profile its own session name (-sid-) and it keeps the same mobile or residential exit, so your profiles look like distinct real devices on distinct real connections. Both SOCKS5 and HTTP are supported, so any antidetect tool connects in seconds.
Ad verification, SERP, and price monitoring See search results, ads, and prices exactly as a real user in a specific country or city sees them. Country, city, ASN, and carrier targeting give you the right vantage point for verifying campaigns and tracking competitor pricing, and the never-expires balance suits monitoring that is heavy some weeks and light others.
Social media and marketplace operations High-trust mobile IPs are the safest foundation for managing accounts on platforms that scrutinise IP reputation. One sticky mobile IP per account, held with a session name, is the standard pattern.
Sneaker, ticketing, and release-day automation These markets are won and lost on IP quality and the ability to present many distinct high-trust IPs at once. Carrier mobile exits plus parallel session names are built for exactly that.
AI agents and autonomous workflows The newest and fastest-growing use case: an AI agent that needs to browse, research, or transact can buy its own proxy through the API or the x402 rail, with no human and no signup. The full toolkit lives at https://agents.proxies.sx, and the next section explains why it matters.
15. THE AGENTIC WEB AND x402: WHY THIS MATTERS NOW
The web is filling with autonomous AI agents - software that browses, gathers information, and increasingly pays for things on a person’s behalf. Those agents hit the same wall human users do: anti-bot systems, geo-blocks, and rate limits that all demand a trustworthy IP. But agents have an extra problem - they cannot fill in a signup form, sit through a sales call, or enter a card. The entire commercial model of the legacy proxy industry is invisible to them. Proxies.sx solves this with x402, an open standard built on the long-dormant HTTP 402 “Payment Required” status code. The flow is machine-native end to end:
- The agent requests a proxy with no account and no payment.
- Proxies.sx replies with a 402 that describes the price and accepted payment networks in a structured, machine-readable form.
- The agent pays in USDC stablecoin on-chain - on Base or on Solana.
- It retries with the transaction hash and instantly receives working credentials.
No human is ever in the loop. Settlement is fast enough to live inside an agent’s reasoning cycle - roughly two seconds on Base, around 400 milliseconds on Solana - and purchases start at $0.40, so an agent can buy exactly the bandwidth a single task needs. It can top up mid-task, swap out a bad exit, and read its remaining balance, all programmatically.
For developers, the complete agent toolkit - documentation, machine-readable skill files, a well-known agent card, an MCP integration, and live working examples - is published at https://agents.proxies.sx. If you are building with frameworks that speak MCP or x402, Proxies.sx is designed to be a drop-in source of real mobile and residential IPs your agent can acquire by itself.
Why bet on this now: as agent-driven traffic grows, the network that is already the default, friction-free proxy for autonomous software earns a flywheel the subscription-and-sales-call incumbents are structurally unable to copy. Proxies.sx is building for that future while remaining a first-rate, human-friendly proxy today.
16. FREQUENTLY ASKED QUESTIONS
- Is there a subscription or monthly minimum? No. Proxies.sx is pure pay-as-you-go at $4 per GB, and your traffic never expires. Top up at https://client.proxies.sx and spend whenever you like.
- Do my gigabytes expire? No. Purchased GB sit on your balance until you use them, over weeks or months. What is the cheapest way to test the service? Top up a few dollars in the dashboard, or, through the x402 agent route, buy from as little as $0.40 (0.1 GB). Either way you can try real mobile IPs for pocket change.
- Do you support HTTP and SOCKS5? Both, on the same gateway: gw.proxies.sx:7000 for HTTP and gw.proxies.sx:7001 for SOCKS5.
- How do I keep the same IP for a whole session? Pass a session name with -sid- and use a sticky rotation mode. On mobile, sticky pins the modem - carrier NAT can still re-issue the exit IP - so for a single held IP across a long workflow, use a residential exit.
- Can I target a specific country, city, or carrier? Yes - all of those, plus ASN, ISP, and IP type, set directly in the proxy username. The current per-country and per-carrier availability is always live in your dashboard. Which countries and carriers do you offer? The mobile fleet covers the US, UK, and core Europe today and expands continuously, backed by a residential pool across dozens more countries. Because the network grows every week, the authoritative current list is the live stock view at https://client.proxies.sx rather than any fixed table.
- How do I pay? Card via Stripe, crypto via hosted checkout (BTC, ETH, LTC, USDT, USDC), or USDC over x402 on Base or Solana for the agent route.
- Can an AI agent buy a proxy automatically? Yes - that is exactly what the x402 rail is for. Your agent can discover, pay for in USDC, and use a proxy with no human and no account. Start at https://agents.proxies.sx.
- Can I resell Proxies.sx under my own brand? Yes. The reseller platform gives you sub-accounts, your own pricing, real-time webhooks, and an open-source white-label kit. You run the brand; Proxies.sx runs the modems, relays, and gateway.
- Is there an affiliate program? Yes - 20% on a referral’s first purchase and 10% recurring for the life of the account. Activate your link in the dashboard at https://client.proxies.sx.
- Do you have an API? Yes - a full REST API with scoped keys, plus an MCP integration for AI assistants and the x402 payment rail for fully autonomous agents.
17. QUICK REFERENCE
Website: https://proxies.sx
Dashboard: https://client.proxies.sx
AI agent hub: https://agents.proxies.sx
Gateway (HTTP): gw.proxies.sx:7000
Gateway (SOCKS5): gw.proxies.sx:7001
Pricing: $4 per GB, pay as you go, never expires; volume discounts to 40%
Entry price: from $0.40 (0.1 GB) via the x402 agent route
Mobile countries: US, UK, and core Europe today, expanding continuously
Wider pool: residential and mobile across dozens of countries, growing weekly
Live availability: current per-country and per-carrier stock shown in your dashboard
Protocols: HTTP and SOCKS5
Pools: mbl (dedicated mobile), peer (residential/community), any, best
Rotation: sticky, sticky-strict, auto5/10/20/60, ondemand
Targeting: country, carrier, city, ASN, ISP, IP type
Payments: card (Stripe), crypto (BTC/ETH/LTC/USDT/USDC), USDC via x402
For business: white-label reseller platform, 20% + 10% affiliate program
Automation: REST API with scoped keys, MCP, x402 (Base and Solana)
Username pattern: psx_--[-sid-] [-carrier-][-iptype-]
Sample connection: curl -x http://psx_YOURID-mbl-us-sid-test1-rot-auto10:[email protected]:7000 https://api.ipify.org
