Question really says it all. The /opportunitiesendpoint doesn’t seem to offer filtering by contact_id. The UI is able to do this, so I’m hoping that means there is some way to do it via API that I’ve just overlooked.

Hi @Jim_Winstead , Just wanted to share a quick update on this one — it’s now possible to filter opportunities by contact ID in v2. You can use the opportunities endpoint with the contact_id filter: Keap REST API Thanks again for calling this out earlier.

My biggest gripe with the REST API is the poor querying capabilities. Neither REST v1 nor v2 have the ability to search by Contact ID. But with the XML-RPC API you can filter by Contact ID by querying the “Lead” table. https://developer.infusionsoft.com/docs/table-schema/#Lead

Thanks for bringing this up, Jim. Currently, it’s not possible to retrieve opportunities by contact via the v2 API. I’ll report this gap and share an update once it’s resolved.

Gap? There are dozens upon dozens of gaps with most of the REST API Endpoints. They still fail the match the XML-RPC querying capabilities.

@Pav We’ve worked hard to align v2 with the XML-RPC capabilities. We’re working on the gaps identified in our analysis and always welcome feedback. If you spot any specific gap, we’d be happy to take a look.

It would be helpful to know on what gaps have been identified, because REST v2 seems to be much of a clone of the REST v1 querying capabilities. XML-RPC offers far better querying capabilities, because it feels similar to running a SQL Select statement. There are many fields in the tables that can…

@Pav We decided not to include custom field filtering in v2 for now, since there isn’t a performant way to support it. Could you share what kinds of queries you typically run in XML-RPC that you’re not able to do in v2, and what you’re trying to accomplish with them? Understanding that would help us…

@OmarAlmonte - Millions of XML-RPC API calls are being performed every month. All the necessary data is present within your own system. You would be able to see what types of querying that is being performed with XML-RPC. Here are examples of other gaps. REST Improvements - REST v2 - Improveme…

Is it possible to get the opportunities for a contact via v2 API?

API Q&A

OmarAlmonte (Omar Almonte) November 18, 2025, 8:26pm 9

@Pav I’ve addressed your questions and feedback in this post so we can keep everything in one place: REST v2 - Improvements Request

Topic		Replies	Views
REST API: Querying opportunities by contact ID? API Q&A	1	231	September 28, 2023
Retrieving opportunities assigned to contact API Q&A	6	500	July 11, 2019
REST v2 API coverage gaps API Q&A api	3	80	July 16, 2026
Looking up values in custom contact field with REST V2 API API Q&A	16	849	July 22, 2026
REST v2 - List Endpoints - Ability to provide an Array of ID Numbers API Q&A	15	92	July 2, 2026

Is it possible to get the opportunities for a contact via v2 API?

Related topics