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FourthLine API
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Browse the recorded FourthLine APIs and open their documentation.
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Curated starting points
Anthropic
Build assistants that reason, write code, and use tools with the Claude API.
AI models
Apideck
Connect accounting and ERP software through unified APIs and give agents access through MCP.
Business APIs
Firecrawl
Turn websites into structured data and readable content for AI applications.
Search & data
Exa
Search the web and retrieve page content for AI research and agent workflows.
Search & data
Supabase
Connect AI tools to your Supabase projects to query data and manage development workflows.
Developer tools
Stripe
Give AI assistants access to Stripe tools for payments and business operations through MCP.
Business APIs
Husk
Ask Claude or ChatGPT about company spend, subscriptions, invoices and runway through Husk’s MCP server.
Business APIs
ElevenLabs
Add speech generation, transcription, and conversational voice experiences to your app.
Voice & audio
Resend
Send transactional emails from your application with an API built for developers.
Business APIs
Cohere
Build enterprise AI with language models, embeddings, and reranking for retrieval workflows.
AI models
Pinecone
Store and search vector data to retrieve relevant context for AI applications.
Search & data
Tavily
Search the web and extract content for research agents and AI applications.
Search & data
