LinkupAPI

LinkupAPI is a powerful, unified API platform designed to give your AI agents direct access to LinkedIn, WhatsApp, and real-time web data. Instead of juggling multiple integrations and complex authentication systems, you get one single, streamlined endpoint to connect your applications with the B2B channels that matter most. Whether you are building a sales automation tool, a recruitment platform, or an autonomous AI agent, LinkupAPI acts as the bridge between your software and the professional world. The platform offers over 50 different endpoints, covering everything from sending LinkedIn messages and automating engagement to enriching contact data and finding verified email addresses. With an average response time of under 3 seconds and a rock-solid 99.9% uptime guarantee, LinkupAPI is built for production-grade applications that need reliability and speed. The main value proposition is simple: stop wasting time on fragmented integrations and start building smarter, faster workflows with a single, coherent API. It is designed for developers, product teams, and no-code enthusiasts who want to embed LinkedIn outreach, WhatsApp messaging, and company intelligence directly into their products without the usual headaches. LinkupAPI also partners with DataForB2B.ai for specialized People and Company Search capabilities, expanding your data enrichment options even further. The platform is already trusted by over 21 connected accounts and is continuously evolving, with the latest V2 release bringing even more features and improvements.

Engagement API

The Engagement API allows you to automate interactions with thousands of prospects directly through your product. You can programmatically like, comment on, and republish LinkedIn posts, making it feel like a natural, human-led outreach campaign at scale. This feature is perfect for building social selling tools or AI agents that need to engage with target accounts without manual effort. The API handles all the underlying authentication and rate limiting, so you can focus on crafting the right message and targeting the right audience. With real-time tracking, you can see exactly which interactions are happening and measure the impact of your campaigns.

Person API

The Person API is your go-to tool for turning raw contact information into rich, professional profiles. Give it an email address, and it will return a complete profile with name, current role, company, education, skills, and more. You can also search by LinkedIn URL or other identifiers. This feature is invaluable for sales teams, recruiters, and anyone who needs to quickly understand who they are talking to. The data is updated in real-time, ensuring you never work with stale or incorrect information. It transforms a simple email like "[email protected]" into a full dossier on Mark Zuckerberg, including his education at Harvard and his leadership skills.

Signal API

The Signal API crawls the web in real-time to deliver live company insights, job changes, and buying intent signals. This feature helps you stay ahead of your market by monitoring for events like a prospect changing roles, a company starting a hiring spree, or a competitor launching a new product. Instead of manually checking news feeds or LinkedIn updates, your AI agent can automatically receive these signals and trigger appropriate actions, such as sending a personalized message or updating a CRM record. It turns raw data into actionable intelligence that drives your outreach and sales strategies.

Email API

The Email API is designed to reverse-engineer email addresses from professional profiles. If you have a LinkedIn URL or a person's name and company, this API can find their verified work email. It combines multiple data sources to deliver high accuracy, so you can confidently reach out to prospects via email without worrying about bounces or wrong addresses. This feature integrates seamlessly with the Person API, allowing you to first enrich a profile and then immediately get the verified email address. It is a must-have for any B2B outreach tool that wants to offer a complete contact solution.

Sales and Growth

Build powerful prospecting and outreach features directly into your sales platform. Use LinkupAPI to generate leads from LinkedIn, enrich those leads with company and contact data, and then automatically send personalized messages or connection requests. You can also monitor buying signals, such as a prospect changing jobs or a company announcing a new funding round, to time your outreach perfectly. This use case helps sales teams move faster, automate repetitive tasks, and focus on closing deals rather than manual data entry.

Recruitment and ATS

Source qualified candidates and track hiring companies automatically using LinkupAPI. Recruiters can search for candidates by role, company, or skills, then enrich those profiles with verified emails and full work histories. The platform also allows you to monitor companies for new job postings or changes in their hiring teams. You can integrate this directly into your Applicant Tracking System (ATS) to automatically discover talent, send outreach messages on LinkedIn, and keep your candidate pipeline fresh without any manual effort.

AI Agents

Equip your autonomous AI agents with the ability to interact with the real world through LinkedIn and WhatsApp. An AI agent can use the Engagement API to like and comment on posts from target accounts, use the Person API to research leads, and use the Email API to send follow-up messages. This creates powerful, self-running workflows that can handle entire outreach campaigns from start to finish. Imagine an AI agent that finds potential clients, researches them, sends a connection request, and then follows up with a personalized email, all without human intervention.

No-Code Workflows (Make, n8n, Zapier)

LinkupAPI is fully compatible with popular no-code automation platforms like Make, n8n, and Zapier. This means you can build complex B2B automation workflows without writing a single line of code. For example, you can set up a trigger that watches for a new lead in your CRM, then automatically uses LinkupAPI to enrich that lead's profile and send a WhatsApp message. This makes the power of LinkedIn and email data accessible to non-developers, enabling marketing teams, operations managers, and small business owners to automate their outreach.

What kind of authentication does LinkupAPI require?

LinkupAPI uses a simple API key-based authentication system. You will need to include your unique x-api-key in the headers of every request you make. For certain actions like sending LinkedIn messages, you may also need to provide a login token for the specific LinkedIn account you want to use. This two-layer approach ensures both platform security and user-level control over account actions.

Can I use LinkupAPI to send messages to anyone on LinkedIn?

Yes, the API allows you to send messages to any LinkedIn user, provided you have a valid LinkedIn URL and a login token for an active LinkedIn account. The API handles the message delivery, including optional media attachments. However, you should always comply with LinkedIn's terms of service and avoid spamming users. LinkupAPI is designed for legitimate B2B outreach and should be used responsibly.

How does the Email API find verified email addresses?

The Email API uses a combination of data sources and algorithms to reverse-engineer email addresses. It looks at patterns from known company domains, public profiles, and other professional databases. When you input a LinkedIn URL or a name and company, the API cross-references multiple data points to deliver the most likely and verified email address. The result is highly accurate, but we always recommend testing the email before sending critical communications.

Is there a limit on how many API requests I can make?

LinkupAPI offers different pricing tiers that come with varying request limits. The platform is built for scale, with an average response time of under 3 seconds and 99.9% uptime. You can start with a free trial or a basic plan to test the waters, and then upgrade as your needs grow. For enterprise-level usage, custom plans with higher limits and dedicated support are available.

Pricing information for LinkupAPI is not available in the provided context. Please visit the LinkupAPI website or contact their sales team for detailed pricing plans and tier information.