Word Orb + Lesson Orb + Quiz Orb — Structured language tools for agents, learning products, and robotics · Start free →

API pricing for verified language infrastructure.

Word Orb is the API and pricing surface for verified vocabulary, structured lessons, and assessments. The Daily Lesson stays focused on the learner habit. LOTD PBC carries partner, funding, and company context.

162,253
Words
365
Shared Lesson Days
45,916
Assessment Items
47
Dictionary Languages
30,526
Graph Links
10
Teaching Styles
Start Free with an API Key
Try Playground Read Docs Robotics Sales Lane Company Context

Enter a work email once and paid checkout opens with the same buyer identity. If you have not created a key yet, Word Orb creates the free key in the background so the workspace is ready the moment billing clears.

Word Orb

Dictionary Infrastructure

Verified definitions backed by etymology. 47-language translations with native script. Pronunciation audio. Age-appropriate explanations from 5 to 65+.

162,253 words · 601,143 translations · 240,000 audio files
Endpoint: /api/word/{word}
Lesson Orb

Lesson Infrastructure

Structured 5-phase lessons across 365 shared calendar days, 4 curriculum tracks, 19 lesson languages, and adaptable teaching styles. Same lesson architecture, one API key.

365 shared lesson days · 19 lesson languages · 10 teaching styles
Endpoint: /api/lesson?day=1&track=learn
Quiz Orb

Assessment Infrastructure

Multiple choice, true/false, A/B comparison, open-ended, reflection prompts, and quizzes. Aligned to every lesson. Explanations included.

45,916 interactions · 6 question types · 4 tracks
Endpoint: /api/quiz?day=1&track=learn

AI Agent Builders

Give your agent a real dictionary, structured lessons, and calibrated assessments. MCP integration in one line. 3ms from the edge. Deterministic, not hallucinated.

Robotics Companies

When your robot teaches a child, every word and every lesson matters. Age-appropriate tones, adaptable teaching styles, pronunciation audio, and assessments help the product stay grounded.

Teaching Platforms

365 days of structured curriculum across 4 tracks. Adaptable teaching styles, vocabulary, lessons, and quizzes stay linked through one knowledge graph. Drop it into your platform.

MCP Standard · Works Everywhere

One config line connects Word Orb to Claude Desktop, ChatGPT, Cursor, Gemini, and any MCP-compatible agent.

{"mcpServers":{"word-orb":{"url":"https://wordorb.ai/mcp"}}}

Start free. Scale when needed.

One API key. All products. Same authentication.

Quickstart docs Live playground Get a free key Robotics companies Education stack Schools & districts Talk to company
Free
$0
500 calls / day
  • Word Orb + Lesson Orb + Quiz Orb
  • 47-language translations
  • Search, fuzzy match, related words
  • Knowledge graph connections
  • No credit card required
Developer
$29/mo
5,000 calls / day included
$0.0006/call overage beyond 150K/mo
  • Everything in Free
  • Text Orb (AI writing & translate)
  • All 10 teaching archetypes
  • Batch up to 50 words
  • Usage dashboard
Pro
$99/mo
50,000 calls / day
  • Everything in Developer
  • SSE streaming responses
  • Spaced repetition engine
  • Webhooks
  • Learner state tracking
Enterprise
$499/mo
Unlimited
  • Everything in Pro
  • Teams & SSO
  • Custom vocabulary
  • IP allowlisting & SLA
  • Dedicated support

Start exploring in 60 seconds

One API key works across Word Orb, Lesson Orb, and Quiz Orb. 500 free calls/day. Enter your work email once and paid plans can continue straight into checkout.

Building a robot that teaches?

Get Orb Verified - the education standard for AI and robotics products. Verified by Lesson of the Day, PBC.

Apply for Orb Verified →

Try all three products

One API key, three products, same authentication

Word Orb
Lesson Orb
Quiz Orb
# Look up a word curl -H "Authorization: Bearer wo_YOUR_KEY" \ https://wordorb.ai/api/word/courage # Returns: definition, IPA, etymology, 47-language # translations, 4 age-group tones, pronunciation audio
# Get a structured lesson curl -H "Authorization: Bearer wo_YOUR_KEY" \ "https://wordorb.ai/api/lesson?day=47&track=learn&age=kid&lang=en" # Returns: 5 phases (hook, story, wonder, action, wisdom) # Add &archetype=explorer for personality-adapted delivery
# Get quiz questions for a lesson curl -H "Authorization: Bearer wo_YOUR_KEY" \ "https://wordorb.ai/api/quiz?day=47&track=learn" # Returns: MC, T/F, open-ended, reflection questions # with answers and explanations # Or get random questions: curl -H "Authorization: Bearer wo_YOUR_KEY" \ "https://wordorb.ai/api/quiz/random?track=learn&count=5"

Platform updates

Get notified about new orbs, language additions, and integration guides.

Proof it works

thedailylesson.com

365 shared lesson days. 4 learning tracks. 19 lesson languages. Kelly as the guide. All powered by Word Orb.