I will develop vapi retell ai custom tools json webhook integration

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Fredrick D
develop vapi retell ai custom tools json webhook integration
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develop vapi retell ai custom tools json webhook integration

About this gig

Do you need your conversational voice bot to do more than just make simple small talk? To build an enterprise-level phone agent, you must configure advanced function calling, clean JSON formatting structures, and ultra-reliable webhooks.


I am an advanced API integration developer specializing in custom tool calling arrays for Vapi, Retell AI, and custom LiveKit setups. I connect your automated voice pipelines to external software applications, allowing your agent to read, write, and pull complex database arrays in real-time.



What I deliver:

  • Build custom JSON tool calling properties for live data queries during active phone calls
  • Repair failed webhooks to establish stable data streams between your voice agent and external APIs
  • Map multi-variable payloads into your GoHighLevel CRM integration or private business databases
  • Eliminate asynchronous data delays by writing highly optimized server-side execution paths
  • Resolve schema format mismatches that cause automated tools to freeze up mid-conversation



Unlock the full technical potential of your system. Message me now to build custom voice tools!


  • AI Model Frameworks & Tools

    • LangChain
    • AutoGPT / Agent GPT
    • Baby AGI
    • CrewAI
    • Retell AI
    • Vapi AI
    • n8n
    • OpenAI ChatGPT
    • Anthropic Claude
    • Google Gemini
    • Mistral
    • Meta Llama
    • Cohere
    • OpenRouter
    • xAI Grok
    • Perplexity

  • Platform

    • Automate
    • HubSpot CRM
    • IFTTT
    • Make (Integromat)
    • Microsoft Power Automate
    • n8n
    • Pabbly Connect
    • Zapier
    • Zoho CRM
    • Zoho Flow

  • Type

    • Email automation
    • Social media posting
    • E-commerce order
    • Customer Support
    • Voice & Calling

  • Automation Integration Points

    • Website
    • Mobile app
    • Google Sheets
    • Trello
    • Slack
    • Email
    • Airtable
    • Asana
    • Monday.com
    • Shopify
    • Salesforce
    • Mailchimp
    • Social Media
    • Hubspot
    • TypeForm
    • JotForm

  • Programming Language

    • Dart
    • Java
    • Kotlin

Get to know Fredrick D

Fredrick D

Crowdfunding Strategist for Kickstarter, Indiegogo, GoFundMe Success

  • FromNigeria
  • Member sinceApr 2026
  • Avg. response time1 hour

  • Languages

    English, Spanish
Crowdfunding Strategist for Kickstarter, Indiegogo, GoFundMe Success I’m Diamond Climax, a crowdfunding strategist helping creators, entrepreneurs, and nonprofits turn ideas into fully funded realities. With proven success on Kickstarter, Indiegogo, and GoFundMe, I craft and promote high-impact campaigns that attract donors, inspire action, and raise more. From concept to launch, I use targeted marketing strategies to make your campaign stand out, gain momentum, and achieve maximum funding

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