Costco US/CA
Complete guide on our Costco module
Our Costco module supports account based checkout and is designed to handle both API and frontend monitoring, multiple queue entry attempts and standard add to cart flows. Costco often uses queues, strict cart validation and fast sellouts but Stellar streamlines the process with session based logins, watch task pairing and optional queue farm setups. This module performs best for high demand products, electronics, limited drops and products known to appear with little warning.
Video Guide
Watch the complete Costco setup
Quick Start: Recommended Setup
Costco has two primary setup types:
Standard restock: Use Monitor and Normal modes.
Queue drop: Use Queue-It and Normal modes.
Identify the expected release type before creating your tasks. Always follow newer drop-specific instructions when provided.
1. Prepare Your Costco Accounts
Before creating tasks:
Add your Costco accounts under Identities → Sessions → Costco.
Confirm each account’s email and password are correct.
Save a default shipping address inside each Costco account.
Create a matching Stellar profile with valid billing, shipping, and payment information.
Match the profile email to the Costco account email when possible.
Clear the Costco account’s cart before starting tasks.
Test the account on an in-stock product before an important release.
Do not add a login proxy to the Costco session unless newer instructions specifically recommend one.
Costco accounts log in when the task starts, not when the session is created.
Use strictly one active Normal checkout task per Costco account. Running multiple checkout tasks on the same account can cause account locks, login instability, and checkout failures.
Costco US supports Visa and Mastercard. American Express is not supported.
2. Prepare Your Proxies
Proxy quality is one of the most important parts of a Costco setup.
Recommended approach:
Prioritize high-quality residential proxies for Normal checkout tasks.
Use multiple residential providers or pools.
Test US, Canadian, and UK residential pools.
Canadian and UK residential proxies may perform well on Costco US.
Keep separate proxy groups for monitoring and checkout when possible.
Remove proxies that repeatedly receive Akamai or Kasada bans.
Test ISP and residential proxies for Queue-It tasks when current drop guidance permits it.
Do not rely on a single provider or proxy pool.
3. Choose the Correct Setup
Standard Restock
Use this setup when Costco is not using a Queue-It waiting room:
Create approximately one Monitor task per product.
Create one Normal checkout task per Costco account.
Enable Watch Task on the Normal task.
Leave Wait for Queue Pass disabled.
Start the Monitor and Normal tasks before the expected restock.
The Monitor task detects stock and pings the linked Normal checkout task.
Queue Drop
Use this setup when Costco activates a Queue-It waiting room:
Create one Normal checkout task per Costco account.
Create Queue-It mode tasks to generate multiple queue entries.
Enable Wait for Queue Pass on the Normal task.
Disable Watch Task on the Normal task.
Start the Queue-It and Normal tasks when the queue goes live.
When a Queue-It task passes the queue, it transfers the passed queue session to the waiting Normal checkout task.
4. Recommended Normal Task
For a Queue-It release, use:
Mode: Normal
Profile: Matching Costco profile
Checkout Proxy: High-quality residential proxy
Product URL: Exact Costco product URL
Delay: Start around
4000Quantity:
1, unless a different product limit is announcedSession: Select the Costco account or leave blank for profile matching when supported
Queue Captcha Provider: Capsolver is currently recommended
Use Account Address: Enabled
Skip Cart Clear: Disabled
Send Cart Webhook: Enabled
Watch Task: Disabled
Wait for Queue Pass: Enabled
Endless Mode: Disabled
Start Time: Usually unnecessary
For a standard non-queue restock:
Enable Watch Task.
Disable Wait for Queue Pass.
Run a Monitor task for the product.
5. Recommended Monitor Task
Use:
Mode: Monitor
Product URL: Exact Costco product URL
Monitor Type: API or ATC
Monitor Proxy: Tested proxy group
Monitoring Delay: Start around
5000Reset Delay: Start around
5000
API monitoring may detect products more quickly but can be more demanding on proxies.
Approximately one Monitor task per product is sufficient for most users.
6. Recommended Queue-It Tasks
When a Queue-It waiting room is active:
Use Queue-It mode inside the Costco module.
Enter the correct Costco Queue-It URL.
Use tested proxies.
Select the configured Queue Captcha Provider.
Start Queue-It tasks when the queue goes live.
Run the Queue-It and Normal tasks at the same time.
Scale only to what your computer or server can handle reliably.
A common starting range is approximately:
Queue-It tasks do not use Costco accounts. The number you can run depends on your computer, proxies, captcha capacity, and the latest drop instructions.
7. Queue Captcha Setup
Capsolver is currently recommended for Costco Queue-It captchas.
Other supported options may include:
Built-in Bot harvester
CapMonster
AYCD
Costco captcha AutoSolve does not work through the built-in Bot harvester. If you select Bot, be prepared to solve the captchas manually.
Configure and test your selected captcha provider before the queue opens.
8. Login Method
Costco supports Regular and OTP login methods.
Costco may temporarily flag accounts, which can interrupt Regular login. OTP login can retrieve the verification code through IMAP or manual input.
When running multiple accounts, the current general recommendation is to test a mix of Regular and OTP login tasks.
If using OTP with IMAP, configure and test the IMAP session before the release.
9. Stop Task After Carting
Enable Stop Task After Carting if you want the task to stop after adding the product to cart so you can complete checkout manually.
This is currently recommended when:
Your proxies regularly fail during automated checkout.
You want to reduce the chance of an account being temporarily blocked.
You are comfortable completing checkout manually.
After the item carts, use the globe icon beside the task to open its authenticated Costco session.
Leave Stop Task After Carting disabled when you want Stellar to attempt the complete automated checkout flow and you have tested that your proxies can complete it reliably.
10. Start and Verify Your Setup
For standard restocks:
Start the Monitor task.
Start the Normal task with Watch Task enabled.
Confirm the Normal task is waiting for a monitor ping.
Keep tasks running through additional stock waves.
For Queue-It releases:
Wait for the Costco queue to open.
Start the Queue-It tasks.
Start the Normal task with Wait for Queue Pass enabled.
Confirm Watch Task is disabled.
Confirm the Normal task is waiting for a passed queue session.
Keep both task types running unless Stellar staff instructs you to restart.
Before the release, confirm:
Stellar is updated.
The Costco account and profile match.
A default address is saved on the account.
The account’s cart is empty.
Proxies have been tested.
The correct product URL is entered.
Only one Normal task is using each account.
The captcha provider is configured.
Watch Task and Wait for Queue Pass match the release type.
A test checkout or cart attempt has been completed.
Preliminary Checklist
Before setting up tasks on Costco, make sure you have everything below prepared:
Profiles
Accounts are required for checkout.
Matching billing + shipping info
1 account per task
Account email must match the profile email for best performance.
Do NOT use login proxy in account session
Make sure default shipping address is saved inside your Costco account.
Clean profiles reduce checkout errors
Proxies
Proxy quality matters the most on Costco.
Prioritize residential proxies for checkout.
Use multiple residential providers and geographic pools.
ISP and residential proxies may be tested for Queue-It tasks when allowed by the latest instructions.
Do not rely on one provider.
Save both proxy groups under the Proxies tab in Stellar.
If you're looking for proxies, check out Stella Proxies for high quality ISP and Residential proxies. As always, it's recommended to have multiple proxy providers, don't just rely on one.
Use a mix of US, CA and UK pools.
CA + UK resi have recently been performing very well on Costco US.
Costco Accounts
Accounts are required for checkout.
Account email must match the profile email for best performance.
Make sure default shipping address is saved inside your Costco account.
Cook Group Access
Optional but recommended. Your cookgroup can help you find product URLs, SKUs and early restock alerts.
Test Task
Before big drops, run a test task on a random in stock product to confirm your account, proxies and delays are functioning correctly.
Sessions & Login
1. Go to Sessions tab
2. Click on Add Session
3. Enter:
Session Name
Email (Costco account email)
Password (Costco account password)
4. Click Save
5 . Session logs in automatically when starting a Normal mode task
Task Overview
Normal Mode
Monitor Mode
Queueit Mode
When to Use Modes
Normal Mode (Checkout Mode)
Standard checkout flow
Logs in → ATC → checkout
Uses session credentials
Best for direct restocks and fast moving items
Monitor Mode
Monitors the product (API or ATC)
Pings any checkout task with Watch Task enabled
Does not add to cart or checkout
Unlimited number of monitor tasks allowed
Queueit Mode
Creates many queue entries
Each task receives a different queue position
When a task passes queue, it pings your Normal Mode checkout task (if “Wait for Queue Pass” is enabled). You can start tasks as soon as the queue is up on a costco product.
Ideal when Costco uses QueueIt for hot products
Users often run hundreds of Queueit Mode tasks
Profile
Select the profile you want to use for checkout
If “Use Account Address” is off → uses profile’s address
If “Use Account Address” is on → uses Costco account default address (recommended)
Proxies
You may use:
High quality Residential proxies (US, CA, UK mix recommended)
If you're looking for proxies, check out Stella Proxies for high quality ISP and Residential proxies
Product URL
Find the product on Costco and copy the full product URL.
Example:
Paste into your task’s URL field.
Your cookgroup will provide product URLs
Monitor Type
ATC → frontend monitoring (via Costco.com)
API → backend monitoring
Usually detects faster
More intense on proxies
Delays
Recommended:
Normal checkout delay: approximately
4000Monitor delay: approximately
5000Reset delay: approximately
5000
Adjust based on your proxies and cook group guidance.
Quantity (QTY)
Check with your cookgroup for product specific quantity rules
Stellar does not auto adjust if you set quantity too high
Session
Allows you to pick which Costco session to use for the task.
Queue Captcha Provider
Choose how to solve Costco QueueIt captchas:
Bot → built-in harvester. please note that autosolve WILL NOT work with costco.
Capsolver → automatic via third-party
Capmonster → automatic via third-party
AYCD → via AYCD toolbox
Configure depending on your provider.
Login Method
Costco is known for frequently temp banning or flagging accounts, which can interrupt task flow. To help with this, Stellar supports Passcode (OTP) Login, allowing you to fetch the verification code through IMAP or Manual Input.
At the moment, OTP Login works even on temporarily flagged accounts, but Costco may tighten security at any time. For best results, we recommend running a 50/50 mix of Regular Login and OTP Login, while still using one account per task.
Use Account Address (Recommended)
ON → uses address saved in Costco account
OFF → uses Stellar profile address
ON is recommended for smoother checkouts.
Skip Cart Clear
ON → wont clear cart upon starting task meaning you will check out item(s) you already have carted in your account along with the item you're running in bot
OFF → cart will be cleared upon starting task
Send Cart Webhook
ON → You'll receive a Discord webhook when your task carts an item
OFF → No Discord webhook will be sent
Task Stop After Carting
ON → Your task will stop after successfully carting your item(s)
Open Browser (Globe Icon) The globe icon allows you to open a logged in browser session directly from a running task with the account already authenticated and ready to checkout. This is especially useful for users running a few accounts or troubleshooting ACO issues as it lets you manually complete checkout without restarting tasks
Image of the globe icon OFF → Your task will not stop after successfully carting your item(s), it'll continue the normal ACO process and attempt to checkout
Watch Task
Watch Task connects a Normal checkout task to a Monitor task.
Enable Watch Task for standard restocks when:
You are running a Monitor task for the product.
Costco is not using a Queue-It waiting room.
You want the Normal task to wait for a stock notification.
Disable Watch Task for Queue-It releases when the Normal task is waiting for a passed queue session.
Wait for Queue Pass
Wait for Queue Pass connects a Normal checkout task to Costco Queue-It mode tasks.
Enable it only when:
Costco has activated a Queue-It waiting room.
You are running Queue-It mode tasks inside the Costco module.
The Normal task should wait for one of those tasks to pass the queue.
For a Queue-It release:
Wait for Queue Pass: Enabled
Watch Task: Disabled
For a standard non-queue restock:
Wait for Queue Pass: Disabled
Watch Task: Enabled when using a Monitor task
Wait for Queue Pass does not work as a replacement for ordinary product monitoring.
When to Start Tasks
Standard Restocks
Start the Monitor and Normal tasks before the expected restock.
Confirm:
The Monitor task is actively monitoring.
The Normal task has Watch Task enabled.
The Normal task is waiting for a monitor ping.
Wait for Queue Pass is disabled.
Queue-It Releases
Start the Queue-It and Normal tasks when the Costco queue goes live.
Confirm:
Queue-It tasks are entering the queue.
The Normal task has Wait for Queue Pass enabled.
Watch Task is disabled.
The captcha provider is working.
The Normal task is waiting for a passed queue session.
Do not restart tasks unless you identify a specific setup problem or Stellar staff instructs you to restart.
How Many Tasks?
Normal Tasks
Use strictly one active Normal checkout task per Costco account.
Do not reuse the same account across multiple active checkout tasks.
Monitor Tasks
Approximately one Monitor task per product is sufficient for most users.
Additional monitors may provide redundancy but are not normally required.
Queue-It Tasks
A common starting range is:
Scale according to:
Computer or server performance
Proxy availability and quality
Captcha-solving capacity
Queue traffic
Current Stellar instructions
Queue-It tasks do not use Costco accounts.
Captcha Strategy
Capsolver is currently recommended for Costco Queue-It captchas.
Configure and test the selected captcha provider before starting Queue-It tasks.
If you select the built-in Bot harvester, be prepared to solve Costco captchas manually because its AutoSolve feature does not support Costco queue captchas.
Only run as many Queue-It tasks and captcha requests as your setup can handle reliably.
Important Notes
Costco is heavily protected by Akamai
Proxies are the most important factor
One account per task ONLY
Running multiple tasks on one account = instant clip
Manual Checkout (If Needed)
If tasks cart but fail checkout: Use: • Globe icon next to task (recommended) • Open browser from Sessions • External tools (not recommended, slower) Make sure Chrome is installed for in-bot browser
Final Reminder
Costco is extremely competitive and heavily dependent on proxy quality and scale. The better your proxies and the more tasks you run, the higher your chances of passing queue and securing a checkout
Latest Costco Prep Call
Watch latest Costco Prep Call
Coming soon...
Common Errors and Fixes
Akamai Ban
Cause: Account- or proxy-related issue
Fix:
Try different proxies
Reset the Costco account password
Kasada Ban
Cause: Account- or proxy-related issue
Fix:
Try different proxies
Reset the Costco account password
Waiting For Monitor
Cause: Normal status message
Fix:
Task is waiting for a monitor-mode task or server-side monitor
Will proceed once the product is detected in stock
Costco Queue Drop FAQ
Do I use the regular Queue-It module or Costco module?
Use Costco module with Wait for Queue Pass enabled and Queue-It MODE tasks started.
How many Queue-It tasks should I run?
There’s no fixed number, but don’t run 10–20 tasks. That won’t pass in time.
Do I use residential proxies or ISPs?
Use a mix of both and see what performs better for you.
Is it one account per task?
Yes. Strictly one account per task.
Using multiple tasks on one account will clip it instantly.
Do I use “Stop Task After Carting”?
With current strict costco checkout restrictions using proxies it is RECOMMENDED to use this feature unless you know your proxies will work on the checkout flow to avoid getting your account softbanned, you can manually checkout once the item has been carted.
Use it if you constantly have issues with ACO.
Some members prefer manual checkout because Costco’s protection can be inconsistent.
I’m using AMEX and my tasks are showing errors - what do I do?
AMEX isn’t supported at Costco. Only Visa and Mastercard work.
“adding to cart - akamai ban”
Proxy block. Try different providers - ideally residential proxies.
“initiating checkout - akamai ban”
Account temporary block or proxy block.
Try running tasks with Stop Task After Carting enabled and check out manually.
If you see ERR_HTTP2_PROTOCOL_ERROR or “Costco mobile services unavailable”, it’s a 100% account block. Let the account rest for a while.
“error submitting order - server error”
Caused by profile issues or Costco itself.
We pushed three updates to improve handling of this error, but if it’s profile-related it may not be solvable.
Test your profile on an in-stock item:
If it works, it’s site-related and our updates should improve it further.
Where do I check out once my task carts and I have “Stop Task After Carting” enabled, or when the task tells me to check out manually after failing Akamai on initiating checkout?
You have three options:
Globe icon next to the task status
This loads your logged-in session directly.
Just follow the normal checkout steps.
Open Browser in Sessions
Same as the globe icon next to the task.
Opens the session with your account already logged in.
External browser or tools (e.g. AYCD)
Possible, but very time-consuming.
This is why using the in-bot browser is strongly recommended.
In-bot browser requirement
Chrome must be installed in the default system path.
Just install Chrome normally and it will configure itself automatically.
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