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.
Quick Start (Recommended Setup)
Add your Costco session under Identities → Sessions.
Make sure your Costco account has default shipping address saved.
Create profiles with full billing, shipping, and payment information.
Run:
1 Monitor task per product (API or ATC)
1 Normal mode checkout task per account
Clear your Costco cart before starting tasks.
If the product uses a QueueIt system, run Queueit Mode tasks (hundreds recommended) and enable Wait for Queue Pass on your Normal mode checkout task. Don't use watch task for normal mode if Queueit system is live
Use ISPs, DCs, or resi proxies depending on your setup.
Keep checkout delay low (around 2000 ms).
Preliminary Checklist
Before setting up tasks on Costco, make sure you have everything below prepared:
Profiles
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.
Proxies
ISP proxies – Recommended for some of your tasks
Residential proxies – Recommended for majority of your tasks
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
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
Important: Your Costco account logs in when tasks start, not when the session is created. Always clear your cart manually before running tasks.
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)
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:
ISP
DC
Residentials
If you're looking for proxies, check out Stella Proxies for high quality ISP and Residential proxies
All three work depending on your strategy and budget.
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:
Monitor Delay: ~5000 ms
Checkout Delay: ~1000 ms
Reset Delay: ~5000 ms
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
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
Helps reduce proxy bans and improve speed.
If enabled:
Checkout task waits for Monitor task
Monitor task pings checkout when product is in stock
Checkout task immediately starts ATC + checkout
If disabled:
Checkout task monitors, ATCs, and checkouts independently
Higher request load
Disable Watch Task if product is using queue system
Wait For Queue Pass
ON → Your task will wait for a queueit mode task to pass queue before attempting to checkout
OFF → Your task will not wait for a queueit mode task to pass queue
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”?
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.
Last updated
Was this helpful?