Via API steps and webhooks No app to install: Kerux talks to Claude (Anthropic API)'s API with HTTP steps and webhooks, set up once.

Claude, with your own key, inside a LinkedIn campaign

Q: Kerux has AI already. Why use my own key?

Kerux's own AI features (reply types, Ask AI, Reply with AI) use Kerux's AI credits. Your own key gives you your model choice, your prompts and your Anthropic billing.

An API step sends the lead's title, headline and company description to Claude through Anthropic's Messages API, with your prompt. Claude's one-word answer becomes a variable for a Condition or a message.

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How it works

Sofia accepts
Her profile and company are on file.

Claude rates the fit

With your prompt and categories.

The answer drives the branch
Here: a strong fit, straight to the owner.

An example workflow

Invitation accepted.
A Webhook / HTTP step sends {{lead.title}}, {{lead.headline}} and {{company.description}} with your prompt to Claude's Messages API.
The answer is {{steps.claude.response.body.content.0.text}}.
A Condition branches on it: "strong" notifies the owner, "weak" gets a lighter sequence.
Add tags records the fit on the lead.

What data flows

Kerux sends to Claude (Anthropic API)

lead.title
lead.headline
company.description

Claude (Anthropic API) sends to Kerux

content.0.text

Set it up

In the Anthropic Console, create an API key. Kerux sends it in the x-api-key header.
In Kerux, open Integrations > Connections and click Connect on Custom API (under Developers). Pick how Claude (Anthropic API) signs in, paste the key and Claude (Anthropic API)'s Base URL, click Save, then Test connection.
Add an anthropic-version header to the step, with the version from Anthropic's docs.
Add a Webhook / HTTP step named claude: POST /v1/messages with model, max_tokens and messages, and use content.0.text from the answer.
In the campaign's Builder, click Test to open Test on one lead: the lead's journey shows what Kerux sent to Claude (Anthropic API) and what came back.

Plan limits: Anthropic's API is billed per token on your Anthropic account, separately from Claude.ai plans.

Questions

Does Kerux have a native Claude (Anthropic API) integration?

Not a one-click app. Kerux works with Claude (Anthropic API) today through Claude (Anthropic API)'s own API: you save your Claude (Anthropic API) key once in Kerux, then HTTP steps and webhooks do the work inside your campaigns. Nothing to install and no Zapier needed.

Kerux has AI already. Why use my own key?

Kerux's own AI features (reply types, Ask AI, Reply with AI) use Kerux's AI credits. Your own key gives you your model choice, your prompts and your Anthropic billing.

Can Claude's answer go straight to the lead?

It can fill a message variable, but test on a few leads first. Asking Claude for one word (a category) and branching on it is the safest use.

What happens if Claude (Anthropic API) is down or refuses a call?

The lead stops with Claude (Anthropic API)'s own error message and shows in Need attention with a Retry button. It never shows as finished because a call failed, and nothing else goes out to that lead until you decide.

Use it in a campaign

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