Repliers API vs Spark API: MLS listings for licensed agents or MLS data for Flexmls apps
Repliers API is a real estate data API that connects to US and Canadian MLSs and serves their listings through one REST API, with AI search features and an official MCP server. FBS's Spark API and RESO Web API give authorized applications access to MLS data on the Flexmls/Spark platform.
The short answer
- Repliers API: Licensed agents and brokerages who want an AI-ready, MCP-connected API on top of their own MLS feed.
- Spark API: Apps built for agents, brokers or MLSs that use Flexmls, where the MLS member authorizes access.
Side by side
| Repliers API | Spark API | |
|---|---|---|
| Searches | MLS listings from the boards you are licensed with (500+ boards listed), with sold data where your MLS agreement allows. | MLS listings (and, for VOW apps, sold data) from participating MLSs, within the roles each MLS grants. |
| Returns | Listing records including an agents field with contact information, brokerage affiliation and roles, plus office details. | MLS listing records in Spark or RESO Web API format. |
| Before the first call | A Repliers account and API key; production data requires being a licensed real estate agent with a data agreement with your MLS. | A free developer account, then an MLS data plan or an MLS member who authorizes your app. |
| Free | Preview plan: $0 a month, with sample data only. | Developer account sign-up is free. |
| Paid | Standard plan: $199 a month (single MLS). | $50 a month for each MLS you access, once you have data from your first MLS (MLS data plans may set their own terms). |
| Acting on a result | Listings include the listing agents' contact details (email, phones, website) and brokerage, as the MLS provides them. | Not stated on its pages |
| Limits on keeping or showing results | Not stated on its pages | No storing MLS content except temporary caching for performance, unless your key permits replication; MLS display rules and license terms apply. |
| Coverage | US and Canada, MLS by MLS (500+ boards listed). | Participating MLSs on the FBS platform; no list or count on its pages. |
| MCP server | Official open-source MCP server, hosted at https://mcp.repliers.io (repo: https://github.com/Repliers-io/mcp-server) | No official server listed |
Where Openpath fits
Openpath has no homes listed yet. Owners and landlords can list a home for rent or sale on Openpath today, free, and agents will find it through the same search as jobs and businesses. Get listed.
Questions people ask
What do I need before I can use Repliers API?
A Repliers account and API key; production data requires being a licensed real estate agent with a data agreement with your MLS.
Is Repliers API free?
Preview plan: $0 a month, with sample data only.
What do I need before I can use Spark API?
A free developer account, then an MLS data plan or an MLS member who authorizes your app.
Is Spark API free?
Developer account sign-up is free.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
Repliers API, read on October 15, 2026:
- repliers.com/plans-and-pricing: “Build and test your proof of concept with sample data. Upgrade to unlock production data when ready.”
- repliers.com: “Yes, Repliers integrates with MLS® platforms, requiring users to be licensed real estate agents.”
- repliers.com/faqs: “data agreements are still required with your MLS”
- repliers.com: “With Repliers, you can connect to any MLS in the U.S. or Canada.”
- help.repliers.com/en/article/understanding-the-data-in-a-listings-response-v0gh0d: “contact information, brokerage affiliation, and roles”
- repliers.com: “Connect Claude, Cursor, ChatGPT, or any MCP client straight to live MLS listings.”
- repliers.com/repliers-mcp-server: “The Repliers MCP Server connects the full power of the Repliers real estate API”
- repliers.com/plans-and-pricing: “$0 / month Preview Build and test your proof of concept with sample data”
- repliers.com/plans-and-pricing: “$199 / month Standard”
Spark API, read on October 15, 2026:
- sparkplatform.com/docs/overview/api: “The Spark API allows authorized MLS members to request data through developer applications”
- sparkplatform.com/docs/overview/api: “When IDX applications are purchased, the MLS member must authorize that application to access their data.”
- sparkplatform.com/docs/overview/faq: “It’s free to sign up for a Spark API developer account.”
- sparkplatform.com/docs/overview/faq: “Once you have access to data from your first MLS, API access costs $50/mo for each MLS you can access.”
- sparkplatform.com/docs/terms_of_use/developer_agreement_and_terms_of_use: “except for temporary caching purposes necessary for performance enhancement”
- sparkplatform.com/docs/terms_of_use/developer_agreement_and_terms_of_use: “Compliance with MLS Rules and License Terms regarding MLS Content”