The free stack behind Larvabot
Larvabot doesn't resell API calls, so it never charges credits: you pay one flat fee and use it as much as you like. It plugs into free tiers you sign up for yourself, uses several providers for each job so one busy service never stops you, and puts a hard cap on every metered one.
Free-tier details checked September 2026. Providers change their plans, so always check their pricing pages.
How the pieces fit
- Step 1
Analyse
AI reads your site and plans the outreach
- Step 2
Find
Search and alerts surface pages and threads
- Step 3
Contact
Contacts from the page itself first, then free finders, checked for a working mailbox
- Step 4
Send & listen
Approved emails go out; replies stop follow-ups
AI
Reads, scores and writes. Several free providers, tried in order.
Google Gemini
free keyThe main brain: reads pages, scores leads and writes drafts.
How Larvabot uses it →
Groq
free keyThe fast backup brain when Gemini is busy.
How Larvabot uses it →
OpenRouter
free keyOne key for many free AI models, picked automatically.
How Larvabot uses it →
Cloudflare Workers AI
free keyOpen models on Cloudflare's network, with a daily free allowance.
How Larvabot uses it →
Search
Finds the pages worth contacting. Monthly quotas first, one-time credits after.
Tavily
free keyThe first search engine Larvabot asks.
How Larvabot uses it →
Serper
free keyGoogle results, used after Tavily's monthly quota.
How Larvabot uses it →
Linkup
free keyA generous second search engine, built for AI agents.
How Larvabot uses it →
Exa
free keySearch by meaning, great for finding pages like the ones that already work.
How Larvabot uses it →
Brave Search API
free keyResults from Brave's own independent web index.
How Larvabot uses it →
SearXNG
no keyYour own unlimited search engine, self-hosted for free.
How Larvabot uses it →
Contacts
Finds who to write to, from the page itself first.
Hunter
free keyA last-resort email finder.
How Larvabot uses it →
Jina Reader
no keyTurns JavaScript-heavy pages into readable text.
How Larvabot uses it →
Prospeo
free keyFinds an author's email from their name and website.
How Larvabot uses it →
Tomba
free keyArticle URL in, the author's email out.
How Larvabot uses it →
Sends from your own domain, reads replies from your own inbox.
Communities
Threads where people ask for what you offer.
Infrastructure
Free DNS, forwarding and deliverability checks.
Why it stays free: the quota guard
Every metered provider has a hard cap just below its free limit. Larvabot counts each call before making it, and for Tavily, Serper and Hunter it also checks what the provider itself reports as remaining.
See how it works →