How does the AI detect buyer signals?

Claude analyzes each Reddit post and comment for purchase intent language, problem descriptions, tool comparisons, and budget discussions. It assigns an intent score from 1 to 10, with anything above 7 flagged as a high-intent buyer signal.

Can I monitor any subreddit?

Yes. You configure which subreddits to monitor and what keywords or topics to track. The AI adapts its scoring based on the context of each subreddit.

How is this different from Google Alerts?

Google Alerts gives you keyword matches. BuildRadar gives you AI-analyzed signals with intent scoring, competitor context, and actionable summaries. It understands the difference between someone complaining about a tool and someone actively looking to buy an alternative.

All Case Studies

Case Study

BuildRadar: AI-Powered Reddit Intelligence for Indie Founders

An AI agent that monitors Reddit 24/7 for buyer signals, competitor mentions, and pain points relevant to indie founders. Delivers daily intelligence briefs with actionable leads.

Client: BuildRadar (buildradar.xyz)

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Timeline

3 weeks

Investment

$12,999

Key Result

Daily AI briefs with buyer signals from Reddit

BuildRadar dashboard showing daily brief with idea signals, competitor alerts, and buyer signals extracted from Reddit discussions.

The Challenge

Indie founders and bootstrapped SaaS companies need to monitor Reddit for sales opportunities, competitor intelligence, and market signals. But manually scanning dozens of subreddits daily is unsustainable. Existing social listening tools are built for enterprise marketing teams, cost $500+/month, and do not understand the nuance of Reddit conversations or how to identify genuine buying intent versus casual discussion.

Our Approach

We built an AI-powered Reddit monitoring agent with three intelligence layers: buyer signal detection (people actively looking to purchase solutions), competitor alert tracking (mentions and sentiment about competing products), and idea signal scoring (pain points that represent market opportunities). The AI agent uses Claude to analyze Reddit posts and comments, scoring each for relevance and intent. Results are compiled into a daily brief delivered to the founder's inbox with direct links to the original discussions.

What We Built

Reddit API integration scanning configurable subreddits on automated schedules

AI-powered signal classification: buyer signals, competitor alerts, idea signals, pain points

Intent scoring engine that ranks signals by purchase likelihood and relevance

Daily intelligence brief compiler with email delivery via Resend

Web dashboard with signal history, saved leads, and monitoring configuration

Reddit OAuth authentication for personalized subreddit monitoring

Polar.sh payment integration for Pro tier with advanced features

Delivery Timeline

Week 1: Reddit Pipeline + AI Engine

Built Reddit API integration, signal extraction pipeline, and Claude-powered classification engine. Tested against 10,000 real Reddit posts for accuracy.

Week 2: Dashboard + Email Briefs

Built the web dashboard with signal history and monitoring configuration. Implemented daily brief compiler and Resend email integration.

Week 3: Auth + Payments + Polish

Integrated Reddit OAuth, Polar.sh payments for Pro tier, and production hardened. Deployed backend to Railway, frontend to Vercel.

Tech Stack

Hono

Backend API

PostgreSQL

Database

Drizzle ORM

Data Layer

React + Tailwind

Dashboard

Reddit API

Data Source

Anthropic Claude

AI Analysis

Resend

Email Delivery

Better Auth

Authentication

Architecture

backend

Hono on Railway with TypeScript, scheduled jobs for Reddit scanning

database

PostgreSQL with Drizzle ORM for signal storage and user preferences

Anthropic Claude for signal classification, intent scoring, and brief generation

auth

Better Auth with Reddit OAuth as the primary authentication method

Resend for daily brief delivery with custom templates

Security

auth

Reddit OAuth with secure token refresh, no password storage

data

User monitoring preferences encrypted, Reddit API tokens scoped to minimum permissions

rateLimit

Respectful Reddit API rate limiting to stay within platform guidelines

isolation

Per-user data isolation, no cross-tenant signal leakage

The Results

Reddit coverage

Manual (2-3 subreddits)Automated (unlimited subreddits)

Time spent monitoring

2+ hours/day5 minutes reading daily brief

Signal detection

Hit or missAI-scored buyer intent signals

Key Takeaways

Reddit OAuth was the right auth strategy for this product. Users are already on Reddit, so authenticating with their Reddit account felt natural and gave us access to their subreddit subscriptions for personalized monitoring.

The AI scoring model needed training on real Reddit conversations to distinguish genuine buying intent from casual discussion. A post saying 'I need a CRM' scores very differently from 'CRMs are overpriced' even though both mention the keyword.

Daily email briefs with direct Reddit links generated higher engagement than a dashboard-only approach. Founders check email first, not dashboards.

Deliverables

Full source code (backend + dashboard)Reddit API integrationAI signal classification engineDaily email brief systemReddit OAuth authenticationPolar.sh payment integrationProduction deployment on Railway + VercelTechnical documentation

FAQ

Frequently Asked Questions

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