Custom AI Agent for Small Business. Built in 48 Hours From €1,500
What Link AI builds, what it costs, and how a 48-hour custom AI agent for small business replaces five hours of daily admin without replacing your team.
A custom AI agent is a software worker that does one specific job inside your business — handling WhatsApp inboxes, qualifying leads, writing follow-ups, processing orders — and runs 24/7 without breaks. We build them in 48 hours starting from €1,500. Here is what we deliver and how the process works.
What a Custom AI Agent Actually Does
The phrase "AI agent" gets thrown around to mean everything from a glorified autocomplete to a sci-fi assistant. Here is the practical definition that matters for an SMB: an agent is a piece of software with a defined job, access to your tools, and the reasoning capacity to finish that job end-to-end without supervision.
These are the five agent types we build most often, with their exact input → action → output flow.
WhatsApp Inbox Handler
Input: Incoming WhatsApp message from a customer or lead. Action: Reads the message, classifies intent (support, booking, sales, complaint), pulls the contact's history from your CRM, drafts or sends a contextual reply, books an appointment if requested, escalates to a human if confidence drops below threshold. Output: Sent reply, updated CRM record, optional Telegram alert to your team.
Lead Qualifier
Input: New lead from your website form, Meta Ads, or Google Ads. Action: Enriches the contact with public data, scores against your ICP rules, asks 3 to 5 qualifying questions over email or WhatsApp, books a sales call only with qualified prospects. Output: Calendar booking for qualified leads, polite decline for non-fit, full enrichment data in your CRM.
Appointment Booker
Input: Booking request via phone, chat, or form. Action: Reads your live calendar, proposes three slots, confirms with the caller, sends confirmation email plus calendar invite plus reminder sequence. Output: Confirmed booking in Google Calendar or Cliniko or HubSpot, automated reminders 24h and 1h before.
Order Processor
Input: Order from Shopify, WooCommerce, or a custom checkout. Action: Validates inventory, applies discount logic, generates invoice via Moneybird or Stripe, sends confirmation to customer, notifies fulfillment, flags exceptions for human review. Output: Fully processed order, invoice in customer inbox, fulfillment task in your operations system.
Content Drafter
Input: A topic, brief, or trigger event (new blog idea, customer success story, weekly newsletter slot). Action: Researches the topic, drafts the content in your brand voice, generates accompanying images, schedules across LinkedIn, X, Instagram, and your blog. Output: Published or queued content, with you only reviewing and approving.
Why Off-the-Shelf Chatbots Don't Work
Intercom, Drift, ManyChat, and the dozen other "AI chatbot" platforms have a real ceiling. They are built to be generic, which means they fail on exactly the cases that matter for a real business.
The first failure is edge cases. A generic chatbot has a finite decision tree. When a customer phrases a question in a way the tree did not anticipate, the bot loops, asks for clarification, or hands off to a human. In a real SMB inbox, edge cases are not edge — they are 30 to 50% of all messages.
The second failure is tool access. Off-the-shelf bots cannot read your CRM history, check your live inventory, look up your customer's previous order, or write back into your operational systems. They are stuck in their own sandbox. A real custom agent acts inside your stack.
The third failure is reasoning. Chatbot platforms route. Agents reason. Routing means "if user says X, reply Y." Reasoning means "given this conversation, this customer's history, and this business rule, the right action is Z." The gap between routing and reasoning is the gap between a toy and a tool that pays for itself in a month.
Custom agents have business logic baked in. We write the rules that match how your business actually operates — not how a generic SaaS template thinks every business operates.
Our 48-Hour Build Process
Speed is a feature. Every week you wait is a week of admin time you do not get back. Here is the timeline for a Starter agent build.
Day 1 — 14 hours of focused work
Hours 0 to 4: Scope and access. One 30-minute call where you describe the job. We draft a scope document with exact inputs, outputs, edge cases, and escalation rules. You approve. You hand over admin access to the tools the agent will touch (CRM, calendar, WhatsApp Business, etc.).
Hours 4 to 12: Build. We write the agent, wire up integrations, configure the model (typically Claude for reasoning-heavy tasks, OpenAI for lighter ones), and load your business rules and brand voice into the system prompt.
Hours 12 to 14: Test. We run 50+ realistic scenarios end-to-end. Every edge case from the scope doc is verified. You get a test report with conversation transcripts.
Day 2 — 10 hours of deployment and handover
Hours 0 to 4: Deploy and monitor. Agent goes live behind your existing inbox or workflow. Monitoring dashboard is configured so you see every action the agent takes in real time.
Hours 4 to 10: Train and handover. You and your team review the first 10 live interactions with us. We tune based on what you see. You receive full documentation, escalation runbook, and 14 days of post-launch support included.
Pricing Tiers
| Tier | Price | What's Included |
|---|---|---|
| Starter | €1,500 | Single-purpose agent, 1 integration, 48-hour build, 14-day support |
| Growth | €4,500 | Multi-purpose agent, 3+ integrations, monitoring dashboard, 30-day support, team training |
| Custom | €10,000+ | Multi-agent orchestration, custom UI, advanced workflows, ongoing partnership |
Infrastructure costs (model API, hosting, integrations) typically run €50 to €300 per month depending on call volume. No hidden retainers. No mandatory monthly fees beyond infrastructure unless you want active maintenance.
Real Client Examples
RoyalPawsStudioArt — Autonomous Etsy Shop Builder
An Etsy artist running a custom pet portrait studio needed her shop to scale beyond her manual output. We built an agent that takes a customer's pet photo, generates portrait variations using image models, drafts listing copy in her brand voice, and publishes ready-to-fulfill products to her Etsy shop. The agent runs autonomously and the artist reviews the final batch each morning. Output went from 20 listings per week to 80 with no extra hours worked.
Talent Kompas — LLM Rapport-Generator
A Dutch coaching practice for parents of complex teenagers needed scalable assessment delivery. We built an agent that ingests a parent's intake answers, applies the practice's proprietary methodology, generates a personalized 12-page rapport in Dutch, and emails it to the parent. The agent replaces 4 hours of manual writing per rapport and is currently delivering hundreds of assessments per month.
Liquid Beauty — Review Management Agent
A beauty brand with retail and e-commerce sales was losing time monitoring reviews across Google, Trustpilot, Bol.com, and Amazon. We built an agent that scans new reviews hourly, drafts on-brand responses (5-star: gratitude, 4-star: thank + nudge, 3-and-below: empathy + service recovery offer), routes critical reviews to the founder via Telegram, and posts approved replies. Response time on reviews dropped from 3 days to under 2 hours.
What You Need to Start
To kick off a 48-hour build, you need three things ready.
Admin access to the tools you want automated. CRM logins, calendar permissions, WhatsApp Business API credentials, whatever stack the agent will touch. We sign an NDA before access changes hands.
A 30-minute scoping call. One call. You describe the job, we ask the questions that determine scope. We send back a written scope document within 4 hours of that call.
Willingness to test on a real workflow. Agents get better with real data fast. The first 10 to 50 live interactions are where we tune. Founders who hold their breath and put a real workflow through the agent on day 2 see better results faster than founders who keep it sandboxed for two weeks.
That is everything. No long onboarding. No enterprise procurement cycle. We can start within 48 hours of your first email.
Want to see what we have built already? Browse our case studies or read our deep dive on voice AI agents vs callcenters. Curious about what we offer beyond agent builds? See our full services.
Under the hood, our agents typically run on OpenAI Assistants for lightweight workflows and orchestrated Claude Code agents for tool-heavy reasoning. The stack is chosen per use case, not per fashion.
FAQ
How much does a custom AI agent cost?
A custom AI agent from Link AI Agency starts at €1,500 for a single-purpose Starter agent with one integration. The Growth tier at €4,500 covers multi-purpose agents with three or more integrations and a monitoring dashboard. Custom multi-agent orchestration with a dedicated UI starts from €10,000. All prices are one-time builds; ongoing infrastructure typically runs €50 to €300 per month depending on call volume.
How long does it take to build a custom AI agent?
A Starter custom AI agent is built and deployed in 48 hours from kickoff. Day 1 covers scoping, access, build, and testing (14 hours of focused work). Day 2 covers deployment, monitoring setup, training, and handover (10 hours). Growth and Custom tiers extend to 5 to 10 business days depending on integration complexity.
What's the difference between an AI agent and a chatbot?
A chatbot follows a scripted decision tree and answers FAQs from a fixed knowledge base. A custom AI agent reasons through novel situations, calls external tools (CRM, calendar, payment, WhatsApp), holds multi-turn context, and completes full workflows autonomously. Chatbots route or reply; agents act and finish jobs.
Can AI agents access my existing tools and CRM?
Yes. Our custom AI agents integrate with HubSpot, Pipedrive, GoHighLevel, Salesforce, Shopify, WooCommerce, Google Calendar, Calendly, Cliniko, Stripe, Mollie, WhatsApp Business API, Gmail, Outlook, Notion, Airtable, and any tool with a REST API or webhook. If your tool has an API, we connect to it during the 48-hour build.
Book a 30-min agent scoping call
One call. Written scope within 4 hours. Live agent within 48 hours. Starting from €1,500.
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