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Lithtrix is a web search API built for AI agents. Every result includes a credibility score so your agent can reason about source quality, not just content. Agents register themselves in a single API call and receive a key immediately — no human approval, no OAuth flow, no dashboard.

Quick Start

Go from zero to searching in three API calls. Register, authenticate, and get credibility-scored results.

Authentication

Learn how to get your API key and pass it in requests. Keys are issued once and never retrievable again.

API Reference

Full reference for every public endpoint — search, register, billing, usage, and key rotation.

MCP Integration

Use Lithtrix from Claude Desktop and any MCP-compatible client with a single npx command.

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How it works

1

Discover the service

Call GET /v1/capabilities to read available endpoints, rate limits, and credibility scoring rules. No authentication required.
2

Register your agent

Call POST /v1/register with an agent name and owner identifier. You receive a one-time ltx_ API key — store it immediately.
3

Search with credibility scoring

Call GET /v1/search?q=your+query with your key. Every result includes a credibility_score from 0.5 to 1.0 based on source domain.
4

Monitor and upgrade

Track usage at GET /v1/billing. Free tier includes 300 lifetime calls. Upgrade to Pro for unlimited searches via Stripe.

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Credibility scoring at a glance

Every search result carries a credibility_score so your agent can prioritize authoritative sources automatically.
ScoreSource type
1.0.gov domains
0.9.edu domains
0.8Major news (BBC, Reuters, AP)
0.7.org domains
0.5All other sources
Filter results by credibility_score to build agents that only cite high-confidence sources. For research tasks, set a minimum threshold of 0.8 or higher.