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Word Orb by Lesson of the Day, PBC

Verified language APIs for agents, learning products, and robotics

Word Orb is the API and docs surface for vocabulary, structured lessons, assessments, and graph-linked educational JSON. Stay here for pricing, docs, playground access, and use cases. Use LOTD PBC for company, partner, and investor context.

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One API key unlocks 162,253 words, 601,143 translations, 365 shared lesson days across 19 lesson languages, and graph-linked educational JSON. Start free with 500 calls/day and no credit card.
162,253
Words
601,143
Translations
45,916
Assessment Items
30,526
Graph Links

Four working layers, one API key

Word Orb

162,253 words · 47 dictionary languages · 601,143 translations

Definitions, IPA pronunciation, etymology, native-script translations, and vocabulary context that developers can trust in production.

  • One API call returns definition, translations, pronunciation, etymology, and audio URL
  • Age-calibrated definitions: child, teen, adult, elder
  • Batch lookup up to 50 words per request

Lesson Orb

Daily lesson infrastructure · 19 lesson languages · 4 tracks · 10 supported archetypes

Structured lesson context around the shared daily experience: five phases, four tracks, and the pedagogical layer behind Kelly.

  • 5 lesson phases: hook, story, wonder, action, wisdom
  • 4 tracks: learn, grow, teach, trivia
  • Every lesson links to vocabulary and assessments through the knowledge graph

Assessment Layer

45,916 assessment items · 6 question types

Assessment objects aligned to vocabulary and lesson structure, so teams can test exactly what they teach.

  • Questions test exactly what the lesson taught — graph-aligned, not random
  • Random, by-day, and batch modes with difficulty filtering
  • Each question includes the answer and an explanation

Knowledge Graph

30,526 connections · words ↔ lessons ↔ assessments

The graph is the glue. It lets teams trace a word into the lessons that teach it and the assessment items that verify it.

  • Trace any word to find all lessons where it appears
  • Find all vocabulary words in any lesson
  • Build complete teach-then-test cycles from three API calls

Three API calls, one learning cycle

curl JavaScript Python
# 1. Look up the word curl https://wordorb.ai/api/word/courage \ -H "Authorization: Bearer wo_YOUR_KEY" # 2. Get a structured lesson curl "https://wordorb.ai/api/lesson?day=47&track=learn" \ -H "Authorization: Bearer wo_YOUR_KEY" # 3. Assess comprehension curl "https://wordorb.ai/api/quiz?day=47&track=learn" \ -H "Authorization: Bearer wo_YOUR_KEY"
const API = 'https://wordorb.ai/api'; const h = { 'Authorization': 'Bearer wo_YOUR_KEY' }; // 1. Look up the word const word = await fetch(`${API}/word/courage`, {headers: h}) .then(r => r.json()); // 2. Get a structured lesson const lesson = await fetch(`${API}/lesson?day=47&track=learn`, {headers: h}) .then(r => r.json()); // 3. Assess comprehension const quiz = await fetch(`${API}/quiz?day=47&track=learn`, {headers: h}) .then(r => r.json());
import requests API = "https://wordorb.ai/api" h = {"Authorization": "Bearer wo_YOUR_KEY"} # 1. Look up the word word = requests.get(f"{API}/word/courage", headers=h).json() # 2. Get a structured lesson lesson = requests.get(f"{API}/lesson?day=47&track=learn", headers=h).json() # 3. Assess comprehension quiz = requests.get(f"{API}/quiz?day=47&track=learn", headers=h).json()

Common deployment paths

Example integration guides for teams evaluating whether Word Orb fits their product, agent, or robotics stack.

Agents

Agent products that need grounded vocabulary, predictable lesson context, and structured tool outputs instead of improvised definitions.

Learning Products

Learning products that need vocabulary, lesson context, and assessments that plug into existing course flows without synthetic filler.

Robotics

Robotics and embodied systems that need structured JSON, pronunciation audio, and lesson hooks that render reliably on fixed interfaces.

Need more context?

API product here. Company narrative there.

Word Orb stays focused on the product. Funding context, founder background, and public research live at lotdpbc.com.

LOTD PBC

Need company context? The broader ecosystem lives at LOTD PBC.

Lesson of the Day, PBC carries the corporate narrative. Word Orb stays disciplined as the language API and structured content layer teams can build with right now.

If you are here to evaluate the API, stay on this site for pricing, docs, playground access, and integration guides. If you need founder, funding, or research context, jump to lotdpbc.com.

Visit ecosystem hub Partner conversation

Open the robotics sales lane

Start with the robotics company index, then open specific guides for humanoid, education, and service robotics teams evaluating Word Orb.

Figure AI

Humanoid manufacturing and deployment guide for multilingual workforce vocabulary, lessons, and assessments.

Open example guide →

Agility Robotics

Warehouse and rollout guide for standardized terminology training across sites, shifts, and languages.

Open example guide →

Elephant Robotics

Education-robot guide for classroom vocabulary, audio playback, and structured teaching flows.

Open example guide →

Open the robotics company lane →

Start building in 60 seconds

Free tier: 500 API calls per day. Search, translations, audio, lesson hooks, and graph context. No credit card.

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