Kaizen #203 - Answering Your Questions | Handling API Limits and Error Responses

Kaizen #203 - Answering Your Questions | Handling API Limits and Error Responses



Hi Everyone,
Welcome back to yet another post in the Kaizen Series! 
We appreciate your keen participation in the 200th milestone celebration of the Kaizen series. We will continue to answer the queries we received through the feedback. 
When working with Zoho CRM APIs, you must respect API limits, handle errors properly, and deliver meaningful experiences—even when things go wrong. In this post, we will discuss handling API limits and error responses.

Understanding Zoho CRM API Limits

Zoho CRM enforces API limits based on the purchased user licenses and add-on credits, and this is to ensure availability to all users and prevent abuse of its APIs. The following limits are applicable to Zoho CRM REST APIs.

  • API Credits Limits: Each edition (Free, Standard, Professional, etc.) comes with a set number of API credits per rolling 24-hour window. For example, Enterprise/Zoho One offers a baseline of 50,000 plus 1,000 per user license, with a cap up to 5,000,000 credits including add-one credits. You can refer to our help documentation on API limits for more details.
  • Concurrency Limits: Concurrency is the number of parallel API calls that are active at one time instance. Apps are capped at concurrent requests based on CRM edition: Free (5), Standard (10), Professional (15), Enterprise (20), Ultimate (25).
  • Sub-Concurrency Limits: Some resource-intensive APIs have their own concurrency limits (typically 10 concurrent requests): bulk updates, queries, lead conversion, mail, etc. Exceeding these returns a TOO_MANY_REQUESTS error.
  • Limits per Call: Different APIs have specific limits for the number of resources that can be inserted/updated. For example for insert, update, or upsert records, you can pass up to 100 records in one API call. Refer to the individual help documentation for any such limits.

Tips:

  • Monitor Usage: Use Zoho’s dashboard to track API credits in real time. Set alerts if you are approaching limits. Alternatively, keep an eye on the header X-API-CREDITS-REMAINING which denotes the remaining credits that will be present in the response when your API usage exceeds 50 percent or the daily available credit limit. Also, you can customize your usage notification to receive an email alert.
  • Batch Operations: Prefer bulk inserts/updates (up to 100 records/call) to reduce wasteful requests. Use composite APIs when multiple APIs need to be executed. 
  • Space Out Calls: When integrating, use logical intervals and avoid call bursts to prevent concurrency /subconcurrency limit getting applied. We have covered this in more detail in our previous Kaizen post : How to effectively handle API calls to optimize API credits?

Limits in Zoho CRM GraphQL APIs

Like our REST APIs, our GraphQL API calls also consume credits based on the type and number of resources queried. Maximum allowed credits per call is 10 credits.
Complexity for each query is calculated based on the type and number of resources requested, and maximum allowed complexity is 1,000 per query. 
Depth refers to the number of nesting layers of a field. Depth up to seven for metadata and three for records is allowed.
You can refer to our GraphQL API documentation on Credits, Complexity, and Depth for more details.

Handling Errors

 Zoho CRM REST APIs return 200 status codes for every successful API call. Each API error has these sections:
  • Status Code 
  • Error Code 
  • Message 
Different sections of an error response
Here "resource_path_index": 0 in the response indicates which segment of the URL path contains the error, counting after the API version.

Common Errors

  • 400 Bad Request:  
    • INVALID_MODULE
      • Cause: Incorrect module name (e.g., "Lead" vs "Leads").
      • Fix: Use exact API names from Setup > Developer Space > APIs.
    • INVALID_DATA
      • Cause: Malformed JSON/wrong data type.
      • Fix: Validate field formats.
    • DUPLICATE_DATA
      • Cause: Unique field value exists elsewhere.
      • Fix: Disable "Do not allow duplicates" or change value.
    • MANDATORY_NOT_FOUND
      • Cause: Missing required field (e.g., Last_Name in Contacts while trying to insert a new record in Contacts module).
      • Fix: Include all mandatory fields in the request.
  •  401 Unauthorized: 
    • AUTHENTICATION_FAILED
      • Cause: Wrong domain URL .
      • Fix: Use the correct domain-specific URL.
    • INVALID_TOKEN:
      • Cause: Expired OAuth token is used for making API call.
      • Fix: Refresh access token using the refresh token.
  • 403 Forbidden: 
    • NO_PERMISSION
      • Cause: User lacks permission for the resource.
      • Fix: Obtain necessary permission to access the resource.
  •  404 Not Found: 
    • INVALID_URL_PATTERN
      • Cause: URL syntax error.
      • Fix: Verify endpoint structure in API docs.
  •  429 Too Many Requests: 
    • TOO_MANY_REQUESTS
      • Cause: Number of API requests for the 24 hour period is exceeded or the concurrency/sub-concurrency limit of the user for the app is exceeded.
      • Fix: Make calls in accordance with the limits.
  • 207 Multi-Status: 
    • In some cases when the API is partially successful, 207 status code is returned.

Tips

  • Mandatory Fields: Provide all mandatory fields in the response body.
  • OAuth Issues: Ensure correct scopes.
  • Inspect Every Response Body: Parse responses even if the HTTP status code returned is 2XX. 
  • Validate Data Before Calling: Ensure your request matches the expected format. Clean data before submission to prevent 400-range errors (e.g., MANDATORY_NOT_FOUND, DUPLICATE_DATA).
  • Token Issues: Respond to INVALID_TOKEN with a token refresh workflow.

Error Status Code in GraphQL APIs 

Zoho CRM GraphQL APIs return errors in 200 and 400 status codes depending on error type. 200 HTTP status codes are returned in two cases. 
(a) Issue in the input when validated against the schema .
(b) Runtime errors due to credits, depth, and so on.

Refer to the Status Codes and Responses page in GraphQL for more information.
We hope you found this post useful. We will be back next week to answer another query we received.
Let us know if you have any questions in the comments or drop us an email at support@zohocrm.com.


      Zoho Campaigns Resources


        • Desk Community Learning Series


        • Digest


        • Functions


        • Meetups


        • Kbase


        • Resources


        • Glossary


        • Desk Marketplace


        • MVP Corner


        • Word of the Day


        • Ask the Experts


          • Sticky Posts

          • Kaizen #217 - Actions APIs : Tasks

            Welcome to another week of Kaizen! In last week's post we discussed Email Notifications APIs which act as the link between your Workflow automations and you. We have discussed how Zylker Cloud Services uses Email Notifications API in their custom dashboard.
          • Kaizen #216 - Actions APIs : Email Notifications

            Welcome to another week of Kaizen! For the last three weeks, we have been discussing Zylker's workflows. We successfully updated a dormant workflow, built a new one from the ground up and more. But our work is not finished—these automated processes are
          • Kaizen #152 - Client Script Support for the new Canvas Record Forms

            Hello everyone! Have you ever wanted to trigger actions on click of a canvas button, icon, or text mandatory forms in Create/Edit and Clone Pages? Have you ever wanted to control how elements behave on the new Canvas Record Forms? This can be achieved
          • Kaizen #142: How to Navigate to Another Page in Zoho CRM using Client Script

            Hello everyone! Welcome back to another exciting Kaizen post. In this post, let us see how you can you navigate to different Pages using Client Script. In this Kaizen post, Need to Navigate to different Pages Client Script ZDKs related to navigation A.
          • Kaizen #210 - Answering your Questions | Event Management System using ZDK CLI

            Hello Everyone, Welcome back to yet another post in the Kaizen Series! As you already may know, for the Kaizen #200 milestone, we asked for your feedback and many of you suggested topics for us to discuss. We have been writing on these topics over the

          Zoho CRM Plus Resources

            Zoho Books Resources


              Zoho Subscriptions Resources

                Zoho Projects Resources


                  Zoho Sprints Resources


                    Zoho Orchestly Resources


                      Zoho Creator Resources


                        Zoho WorkDrive Resources



                          Zoho CRM Resources

                          • CRM Community Learning Series

                            CRM Community Learning Series


                          • Tips

                            Tips

                          • Functions

                            Functions

                          • Meetups

                            Meetups

                          • Kbase

                            Kbase

                          • Resources

                            Resources

                          • Digest

                            Digest

                          • CRM Marketplace

                            CRM Marketplace

                          • MVP Corner

                            MVP Corner




                            Zoho Writer Writer

                            Get Started. Write Away!

                            Writer is a powerful online word processor, designed for collaborative work.

                              Zoho CRM コンテンツ



                                ご検討中の方

                                  • Recent Topics

                                  • How many groups in Zoho Mail can I make?

                                    I'm currently on the free plan, which has a limit of 10 users. Does that limit includes groups too? If not, what is the limit for groups? Thanks!
                                  • Feature Suggestion for Zoho Social: Auto-reply to Comments or Keywords

                                    Hi Zoho team, I'd like to suggest a very specific feature that would be extremely helpful for customer engagement: the ability to automatically send a reply to comments on posts — either all comments or those containing specific keywords. For example,
                                  • My domain did not activate

                                    Hi, my domain (apsaindustrial.com.ar) did not activate, and the phone verification message never arrived. Please would you solve this problem? Thanks.
                                  • Already have Zoho account. Not letting me log in

                                    I already have a Zoho account that is associated with my Google email and my phone number. Even though I'm already logged in to Zoho, when I click on the mail icon to access my email, it takes me to the pricing page. When I click on the free option, it
                                  • ZOHO Mail App Not working

                                    There seems to be an issue with Zoho Mail App today. It is not connecting to server, internet is working fine, tried uninstalling app and reinstalling, loading circle keeps spinning round. Is there an update on the way?
                                  • facing error 550 5.4.6 while sending emails

                                    Please help me fix this issue
                                  • Allow Itemization for Recurring Expenses

                                    For whatever reason, one cannot itemize a Recurring Expense. This capability should be added. The use cases to support this are largely the same as what they were to allow for itemization in Expenses. Anything that would need to be itemized for a regular
                                  • Zoho reply to not working. just reply to my self

                                    Hello. i using on my wordpress website a contact form from Wsform. i can set the reply to email there. normally it works. but since i am using your wordpress plugin zoho mail it doesn`t work. its not using the reply to (email from customer). I just can
                                  • Painfully Slow Zoho mail

                                    Since yesterday Zoho Mail seems to have starting functioning very slowly and having a few bugs. It's slow to open mails, slow to send, slow to change between email accounts. Sometimes clicking on a particular folder (eg Sent folder) stops working and
                                  • Can't receive any email from other platform

                                    Hello,everyone, i'm just join zoho and create two email accounts for my own business. I was using it to get a verified email from stripe, but can't receive it. and I use my private gmail account to send test email twice, first time show below reply, but
                                  • Weekly Tips: Secure your attachment downloads with Zoho Mail

                                    Safety is one of our main concerns, whether it’s about device security or online protection. We use tools like fingerprint scanners, facial recognition, and two-factor authentication to keep our devices and email accounts secure. We use methods like OTP
                                  • Your Incoming has been blocked and the emails will not be fetched in your Zoho account and POP Accounts

                                    Can some on help me regarding our account . thank you so much
                                  • Zoho Creator integration with Sage 50

                                    Hi, Wondering if anyone has had any experience connecting Zoho to Sage 50 and could share any information on this matter. Thank you.
                                  • Dropshipping Address - Does Not Show on Invoice Correctly

                                    When a dropshipping address is used for a customer, the correct ship-to address does not seem to show on the Invoice. It shows correctly on the Sales Order, Shipment Order, and Package, just not the Invoice. This is a problem, because the company being
                                  • Conditional Email Forwarding

                                    How can I set conditional email forwarding of the users? For example: Mail should be forwarded to a address only if it comes from a particular sender. So, I want such email forwarding, which forwards mails based on particular conditions, like the incoming
                                  • Incoming emails not appearing in Inbox

                                    Hello, I have an issue with incoming emails sent from my website (domain: h2ostop.si). Emails are visible in the Sent folder, which means they are successfully sent through Zoho SMTP, but they never appear in my Inbox. Nothing arrives in Inbox, Spam,
                                  • Automatic Matching from Bank Statements / Feeds

                                    Is it possible to have transactions from a feed or bank statement automatically match when certain criteria are met? My use case, which is pretty broadly applicable, is e-commerce transactions for merchant services accounts (clearing accounts). In these
                                  • Email Opt Out Question

                                    Has the problem where if a customer is emailed opt out prevents you sending standard emails? For me this feature is simply to stop any email marketing and should not block people from receiving emails via Zoho mobile, which makes no sense.
                                  • Can No Longer Access Zoho Email Accounts from iPhone or iPad Apple Mail Apps ,.

                                    Keeps asking for password, Says ID or password incorrect. Tried creating a new app specific password. Same result. Is this possibly related to the server maintenance. Have verified all email settings, userid and password. This has worked for years until
                                  • Latest update caused issue in using marathi typingzoho

                                    With latest update now marathi typing does Not work in zohonotebook. I preferred zoho over other because it was supporting marathi font without any distortion.. But after new update,keyborad simply does not work
                                  • Login verification emails never received.

                                    I can't login to my account. You send a verification email, but it never arrives. This is a common problem, frequently caused by some relay point out there classifying the sender as a spammer. Is there anything I can do to bypass this? Maybe get a text
                                  • Global lists for Multi select

                                    It would be great if I could select a global list to use for a multi select dropdown filed.
                                  • Hotmail is blocking the zoho mail IP

                                    Greetings, Since last Tuesday (5 days ago today) I wrote to Zoho support and I still haven't received a single response (Ticket ID: 2056917). Is this how you treat people who pay for your email service? I am making this public so that those who want to
                                  • Yahoo is rejecting e-mails sent from a Zoho server

                                    Diagnostic-Code: 4.7.0 [TSS04] Messages from 136.143.169.51 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes Remote-MTA: dns; mta5.am0.yahoodns.net
                                  • Yahoo blocks e-mail sent from Zoho servers

                                    Getting this for a bunch of Yahoo addresses. Do you know if some of your servers got blacklisted? Diagnostic-Code: 4.7.0 [TSS04] Messages from 136.143.169.51 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes
                                  • Working with dates and Function Field

                                    Hello friends! I'm trying to add days to a date, however the field function will always shows 00:00:00 after the resultant date. How can I display only the date, whithout the time? toDate(input.request_date.addDay(input.Prazo_acordado),"MM,d,yyyy") The code above will result something like "11-Feb-2020 00:00:00", but I want to display only "11-Feb-2020"
                                  • What's New in Zoho Analytics - November 2025

                                    We're thrilled to announce a significant update focused on expanding your data connectivity, enhancing visualization capabilities, and delivering a more powerful, intuitive, and performant analytics experience. Here’s a look at what’s new. Explore What's
                                  • Unable to send message;Reason:550 5.4.6 Unusual sending activity detected. Please try after sometime.

                                    Please help my account got blocked automatically, can you help me how to avoid it? Thanks so much
                                  • Unusual activity detected from this IP. Please try again after some time

                                    When i try to create new addresses on my account i am getting this error, it has been 24 hours now and i am still getting this error can anyone help
                                  • temporary system errorlouis

                                    J'essaye d'envoyer des mails avec mes 2 adresses mail qe nous avons sur le compte arthur@lepunch.fr et louis@lepunch.fr mais j'ai toujours le message temporaire system error, je reçois les mails mais impossible d'en envoyer a qui que ce soit
                                  • How to Cancel/Delete Queued Mail Merge?

                                    Hi. I just tried to do a mail merge before realizing there's a limit on number of sends. I accidentally sent one of my lists twice, and all of those emails are currently queued. Is there any way to cancel or delete a queued mail merge? Would love to be
                                  • Need to add a new admin for my domain

                                    Hello Zoho Support, I am the owner of the domain localeistanbul.com. The current super admin account (admin@localeistanbul.com) is not accessible. I do not want to reset or delete the existing account because I need to keep all existing emails. Please
                                  • Possible Fraud Site.

                                    Hello. I received a text with the sender's name as zoho, claiming that my account was at risk and that I should sign in at https://verify.zohomails.ru/signin to verify my account. I signed in on the web address above, and a few days later someone hacked
                                  • Zoho mail to Teaminbox

                                    Hello, We're searching for new mail program. Now I'm testing a bit with zoho mail and team inbox. My findings in the research: Pop mail throught zoho mail is almost instant. Any pop or imap via external provider takes a couple minutes to 15 minutes before
                                  • Crear tarea CRM con recordatorio desde Zoho Flow

                                    Hola, estoy intentando crear desde Zoho Flow una tarea en CRM. Lo he logrado hacer pero sin recordatorio, ya que no se como se debe escribir el string adecuado. He probado varias alternativas, pero ninguna me funcionó hasta ahora. - FREQ=NONE;ACTION=EMAIL;TRIGGER=DATE-TIME:${FechaVto}
                                  • Inquiry Regarding Automated Assignment of Zoho TeamInbox Messages using Zoho Flow and Deluge

                                    Hello, Our company is currently using Zoho TeamInbox, and we are interested in automating the assignment of responsible parties using tools such as ZOHO Flow and Deluge. Is it possible to achieve this? Allow me to provide more details. Currently, when
                                  • Images Don't Display on Blog

                                    Hi, I've just posted a new blog entry, but regardless of format (png or jpeg) Images that display in Preview mode do not display on any browser in the published post.  I've not done anything different with this post than others regarding images, please advice. Thanks! Edit:  I've discovered that moving the image files from a my sub directory folder "Pics for Blog" to the top level of the "Files" folder on my site allows the images to display live.  This, even though my other blog posts are correctly
                                  • Upgrade Zoho Desk Agent-Side Answer Bot to GenAI

                                    Hello Zoho Desk Team, We hope you're doing well. Following the recent announcements and rollout of the GenAI-based Answer Bot in Zoho SalesIQ (Nova '25), we’d like to formally request a similar upgrade for the Answer Bot used by agents inside Zoho Desk.
                                  • Marketers' Space: The importance of warming up your sender domain

                                    Hello Marketers, Welcome back to yet another post! Today, we'll talk about why warming up your sender domain matters. Imagine you've recently started a business and want to share the news with your customers. You've designed a great email campaign using
                                  • An Exclusive Session for Zoho Desk Users: AI in Zoho Desk

                                    A Zoho Community Learning Initiative Hello everyone! This is an announcement for Zoho Desk users and anyone exploring Zoho Desk. With every nook and corner buzzing, "AI's here, AI's there," it's the right time for us to take a closer look at how the AI
                                  • Next Page