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AI chatbot for a website or app: product recipe

For a chat assistant inside your product: sign-in, saved history, tools and a model behind it. Every service below is from AgentGid's catalog, with the price and free tier from its official page; the first pick in each part ranks best on free tier, official MCP server, real use and price.

agent.md

What it costs

To start
$0 / month
every first pick has a free tier or is open source (limits apply)
If you outgrow the free tiers
about $84 / month
Clerk $25, LangSmith $39, Resend $20; billed by usage: OpenRouter, Neon
Model, per 1,000 messages
about $0.5
Claude Haiku 5.5; $3.75 with Gemini 3.8 Flash; AgentGid estimate at ~3,000 input + 400 output tokens each

How it fits together

  1. Sign the user in and keep their chat history in the database.
  2. Send each message with recent history to the model through the gateway; stream the answer back.
  3. Give the model tools (search, your API) and log every call.
  4. Rate-limit per user and set a spending cap at the gateway.

LLM gateway (one key, many models)

OpenRouter first pick
MCP
 One OpenAI-compatible API for 500+ models across 80+ providers with routing and fallbacks.
Free: 25+ free models, 50 requests/day · Provider list price per token (no markup); fee on credit purchases: 5.5% Standard, 8% Business · in 29 public agent repos
npm install @openrouter/sdk pip install openrouter agent.md
LiteLLM Open-source proxy and SDK that calls 100+ LLMs in OpenAI format with keys, budgets and logging.
Free: Open-source gateway free to self-host · in 657 public agent repos
pip install litellm agent.md

Also fits: Vercel AI Gateway, Cloudflare AI Gateway, Portkey, Helicone · all llm gateways and routers

Database and backend

Neon first pick
MCP
 Managed Postgres database with autoscaling compute, storage, and backend services.
Free: 1 GB storage, 100 CU-hours compute/month per project, 100 projects, 5 GB Object Storage, 1M function invocations · $0.106 per CU-hr (Launch), $0.222 per CU-hr (Scale); $0.35 per GB-month storage; $0.023 per GB-month Object S… · in 306 public agent repos
npm install @neondatabase/serverless agent.md
Convex Reactive database and backend platform with functions, file storage, and vector search.
Free: 1M function calls, 0.5GB database storage, 20 GB-hours action compute included · paid from $25/mo · $2.20 per additional 1M function calls, $0.22 per additional GB database storage, $0.33 per additional GB-hou… · in 157 public agent repos
npm install convex agent.md

Also fits: Firebase, Appwrite, Prisma, Backendless · all databases and backends

Sign-in and accounts

Clerk first pick Authentication and user management API for sign-up, sign-in, and user profiles.
Free: Up to 50,000 MRU (monthly retained users) per app · paid from $25/mo · $0.02/mo per MRU (50,001-100,000), $0.018/mo (100,001-1M), $0.015/mo (1M-10M), $0.012/mo (10M+) · in 409 public agent repos
npm install @clerk/nextjs agent.md
Stytch
MCP
 Authentication APIs for users and AI agents: passwordless, OAuth, SSO, M2M tokens and connected apps.
Free: 10,000 monthly active users and AI agents; 1,000 M2M tokens · Pay as you go: starting at $0/month, 10,000 MAUs included; fingerprint add-on $.005/fingerprint · in 1 public agent repos
npm install stytch pip install stytch agent.md

Also fits: Descope, Auth0, Keycloak, Ory Network · all auth and user accounts

Traces and evals

LangSmith first pick
MCP
 Tracing, evaluation and monitoring of LLM apps and agents, including prompt and dataset management.
Free: Developer plan: 1 seat, up to 5k base traces / mo, then pay-as-you-go · paid from $39/mo · Plus: $39 / seat per month incl. up to 10k base traces / mo; trace overage is pay-as-you-go (rate not listed … · in 678 public agent repos
npm install langsmith pip install langsmith agent.md
LangWatch
MCP
 LLM observability, evaluation and agent-simulation platform, open source and also hosted.
Free: Developer plan: 50k events/month, 14-day data access, 2 users, no credit card · Growth: EUR 29 per core-seat/month incl. 200k events, then EUR 5 per 100k events (prices shown in EUR only) · in 27 public agent repos
npm install langwatch pip install langwatch agent.md

Also fits: W&B Weave, Ragas, Pydantic Logfire, AgentOps · all llm observability and evals

Email

Resend first pick
MCP
 Developer email API for sending and receiving transactional and marketing email.
Free: 3,000 emails/month, 100/day, 3 domains · paid from $20/mo · Pro $20/month for 50,000 emails; extra emails $0.90 per 1,000 · in 426 public agent repos
npm install resend pip install resend agent.md

Also fits: Mailtrap Email API/SMTP, Brevo, Postmark, Elastic Email · all email sending

Model

Default: fast and cheapClaude Haiku 5.5 · $0.1 input / $0.5 output per 1M tokens · or GPT-6 Luna, MiMo V2.6 Flash
Harder questionsGemini 3.8 Flash · $0.75 input / $3.75 output per 1M tokens · or Kimi K2.7 Code, DeepSeek V4 Pro
Hardest workKimi K3 · $3 input / $15 output per 1M tokens · or Claude Opus 5.5, Claude Fable 5.1

The cheapest model of each price tier that can call tools, from model prices. Try the default first and move up only for the questions it gets wrong.

Or start from a ready platform

RasaFramework and platform for building voice and chat assistants that can be self-hosted: the open-source Rasa framework (Apache-2.0) and the open-core Rasa Pro /…
Free tier
Chatwoot CaptainChatwoot is an open-source omnichannel support desk (live chat, email, WhatsApp and social inboxes) and Captain is its AI agent that answers from help-center c…
Free tier · from $19/mo
DecagonPlatform for deploying AI agents that resolve customer support conversations over chat, email and voice, with workflows written as natural-language Agent Opera…
BotpressPlatform for building and deploying LLM-based support agents with a hosted studio, a conversation-metered pricing model and a public MIT-licensed monorepo of S…
Free tier · from $150/mo

Libraries

AI SDKVercel's unified SDK for building AI apps with OpenAI, Anthropic, Google and more.
npm install ai · Apache-2.0 · Gid Score 80
Next.jsReact framework for production with server-side rendering and static generation.
npm install next · MIT · Gid Score 92
LangGraphFramework for building stateful, multi-actor applications with LLMs.
pip install langgraph · MIT · Gid Score 78
Pydantic AIAI agent framework built with Pydantic for structured, typed agent development.
pip install pydantic-ai · MIT · Gid Score 62

Agent Skills

conversational-ux Owl-Listener/designer-skillsDesign voice and conversational interfaces — dialog flows, error recovery, and persona. Use when the interface speaks and listens rather than being tapped. For graphical…
npx skills add Owl-Listener/designer-skills --skill conversational-ux
chatbot-flow-design rampstackco/claude-skillsDesigning conversational flows for website chatbots and AI agents. Intent recognition architecture, branching logic, fallback handling, escalation to human, conversation…
npx skills add rampstackco/claude-skills --skill chatbot-flow-design

Read a skill before you install it: skills can run scripts.

Coding agent to build it

OpenAI Codex Claude Code OpenCode Pi Compare coding agents

Also on AgentGid

SaaS on Next.js kit Avatars and placeholders Icons

Before you ship

  • Keep API keys on the server, never in the browser or app; set spending limits where the provider offers them.
  • Read each service's terms for your use: data retention, commercial use, rate limits.
  • Log model calls (traces) and test with your own real inputs before launch.

The brief

# Product recipe: AI chatbot for a website or app (AgentGid)

For a chat assistant inside your product: sign-in, saved history, tools and a model behind it.

Parts were picked from AgentGid's catalog by rules: free tier, official MCP server, use in public projects built with AI agents, downloads, price. Prices are list prices from the official pages (see each card for the check date); confirm before you commit.

## What it costs
- Start: $0 a month on the free tiers of the first picks (their limits apply).
- If you outgrow the free tiers, the lowest paid plans of the first picks are Clerk $25, LangSmith $39, Resend $20 (together about $84/month); usage beyond a plan's credits is billed on top.
- Billed by usage (grows with traffic): OpenRouter, Neon.
- Model, default: fast and cheap: about $0.5 per 1,000 messages with Claude Haiku 5.5 (AgentGid estimate at ~3,000 input + 400 output tokens each).
- Model, harder questions: about $3.75 per 1,000 messages with Gemini 3.8 Flash (AgentGid estimate at ~3,000 input + 400 output tokens each).
- Prices of the picks below were checked on the official pages between 2026-10-09 and 2026-10-20.

## How it fits together
1. Sign the user in and keep their chat history in the database.
2. Send each message with recent history to the model through the gateway; stream the answer back.
3. Give the model tools (search, your API) and log every call.
4. Rate-limit per user and set a spending cap at the gateway.

## LLM gateway (one key, many models)
- OpenRouter: free: 25+ free models, 50 requests/day · usage: Provider list price per token (no markup); fee on credit purchases: 5.5% Standard, 8% Business · official MCP https://mcp.openrouter.ai/mcp · npm @openrouter/sdk · pip openrouter · card https://agentgid.com/apis/openrouter/agent.md
- LiteLLM: free: Open-source gateway free to self-host · pip litellm · card https://agentgid.com/apis/litellm/agent.md
- Also fits: Vercel AI Gateway, Cloudflare AI Gateway, Portkey, Helicone (https://agentgid.com/apis/llm-gateway/)

## Database and backend
- Neon: free: 1 GB storage, 100 CU-hours compute/month per project, 100 projects, 5 GB Object Storage, 1M function invocations · usage: $0.106 per CU-hr (Launch), $0.222 per CU-hr (Scale); $0.35 per GB-month storage; $0.023 per GB-month Object Storage; $0.60 per 1M invocations · official MCP · npm @neondatabase/serverless · card https://agentgid.com/apis/neon/agent.md
- Convex: free: 1M function calls, 0.5GB database storage, 20 GB-hours action compute included · paid from $25/mo · usage: $2.20 per additional 1M function calls, $0.22 per additional GB database storage, $0.33 per additional GB-hour action compute · npm convex · card https://agentgid.com/apis/convex/agent.md
- Also fits: Firebase, Appwrite, Prisma, Backendless (https://agentgid.com/apis/backend-db/)

## Sign-in and accounts
- Clerk: free: Up to 50,000 MRU (monthly retained users) per app · paid from $25/mo · usage: $0.02/mo per MRU (50,001-100,000), $0.018/mo (100,001-1M), $0.015/mo (1M-10M), $0.012/mo (10M+) · npm @clerk/nextjs · card https://agentgid.com/apis/clerk/agent.md
- Stytch: free: 10,000 monthly active users and AI agents; 1,000 M2M tokens · usage: Pay as you go: starting at $0/month, 10,000 MAUs included; fingerprint add-on $.005/fingerprint · official MCP https://stytch.com/docs/resources/workspace-management/stytch-mcp-server · npm stytch · pip stytch · card https://agentgid.com/apis/stytch/agent.md
- Also fits: Descope, Auth0, Keycloak, Ory Network (https://agentgid.com/apis/auth/)

## Traces and evals
- LangSmith: free: Developer plan: 1 seat, up to 5k base traces / mo, then pay-as-you-go · paid from $39/mo · usage: Plus: $39 / seat per month incl. up to 10k base traces / mo; trace overage is pay-as-you-go (rate not listed on pricing page); 1 LSU = $1 (Deployment/Fleet/Sandbox usage) · official MCP https://docs.langchain.com/langsmith/langsmith-mcp-server · npm langsmith · pip langsmith · card https://agentgid.com/apis/langsmith/agent.md
- LangWatch: free: Developer plan: 50k events/month, 14-day data access, 2 users, no credit card · usage: Growth: EUR 29 per core-seat/month incl. 200k events, then EUR 5 per 100k events (prices shown in EUR only) · official MCP @langwatch/mcp-server · npm langwatch · pip langwatch · card https://agentgid.com/apis/langwatch/agent.md
- Also fits: W&B Weave, Ragas, Pydantic Logfire, AgentOps (https://agentgid.com/apis/observability/)

## Email
- Resend: free: 3,000 emails/month, 100/day, 3 domains · paid from $20/mo · usage: Pro $20/month for 50,000 emails; extra emails $0.90 per 1,000 · official MCP resend-mcp · npm resend · pip resend · card https://agentgid.com/apis/resend/agent.md
- Also fits: Mailtrap Email API/SMTP, Brevo, Postmark, Elastic Email (https://agentgid.com/apis/email/)

## Model (all of these can call tools; prices per 1M tokens)
- Default: fast and cheap: Claude Haiku 5.5 ($0.1 in / $0.5 out) · https://agentgid.com/models/claude-haiku-5-5/agent.md · or GPT-6 Luna, MiMo V2.6 Flash
- Harder questions: Gemini 3.8 Flash ($0.75 in / $3.75 out) · https://agentgid.com/models/gemini-3-8-flash/agent.md · or Kimi K2.7 Code, DeepSeek V4 Pro
- Hardest work: Kimi K3 ($3 in / $15 out) · https://agentgid.com/models/kimi-k3/agent.md · or Claude Opus 5.5, Claude Fable 5.1

## Or start from a ready platform
- Rasa: free tier · https://agentgid.com/agents/rasa/agent.md
- Chatwoot Captain: free tier, from $19/mo · https://agentgid.com/agents/chatwoot-captain/agent.md
- Decagon: see card · https://agentgid.com/agents/decagon/agent.md
- Botpress: free tier, from $150/mo · https://agentgid.com/agents/botpress/agent.md

## Libraries
- `npm install ai`: AI SDK (Apache-2.0) · https://agentgid.com/tools/ai/agent.md
- `npm install next`: Next.js (MIT) · https://agentgid.com/tools/next/agent.md
- `pip install langgraph`: LangGraph (MIT) · https://agentgid.com/tools/langgraph/agent.md
- `pip install pydantic-ai`: Pydantic AI (MIT) · https://agentgid.com/tools/pydantic-ai/agent.md

## Agent Skills (read a skill before you install it: skills can run scripts)
- `npx skills add Owl-Listener/designer-skills --skill conversational-ux`
- `npx skills add rampstackco/claude-skills --skill chatbot-flow-design`

## Coding agent to build it
- OpenAI Codex: free tier, from $8/mo · https://agentgid.com/agents/openai-codex/agent.md
- Claude Code: from $20/mo · https://agentgid.com/agents/claude-code/agent.md
- OpenCode: free tier, from $10/mo · https://agentgid.com/agents/opencode/agent.md

## Also on AgentGid
- SaaS on Next.js kit: https://agentgid.com/build/kits/saas-starter/
- Avatars and placeholders: https://agentgid.com/assets/avatars/
- Icons: https://agentgid.com/assets/icons/

## Before you ship
- Keep API keys on the server, never in the client; set spending limits where the provider offers them.
- Read each service's terms for your use (data retention, commercial use, rate limits).
- Log model calls (traces) and test with your own real inputs before launch.

Recipe page: https://agentgid.com/build/recipes/ai-chatbot/ · all product recipes: https://agentgid.com/build/recipes/agent.md

Other recipes

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Picked by rules from AgentGid's catalog, not paid placement. Prices are list prices from the official pages, checked between 2026-10-09 and 2026-10-20; check them before you commit.