SoulTrace Personality Assessment

Take an adaptive personality assessment through the SoulTrace API. Answer 24 questions on a 1-7 Likert scale and receive your personality archetype based on a 5-color psychological model.

API Endpoint

POST https://soultrace.co/api/agent

No authentication required. Rate limited to 100 requests/hour per IP.

How It Works

The API is stateless. You pass all accumulated answers with every request, and the server replays the Bayesian inference to select the next optimal question.

Step 1: Start the test

Send an empty answers array to get the first question:

curl -X POST https://soultrace.co/api/agent \
  -H "Content-Type: application/json" \
  -d '{"answers": []}'

Response:

{
  "status": "in_progress",
  "question": {
    "id": 42,
    "text": "I find deep satisfaction in mastering complex systems."
  },
  "currentDistribution": {
    "white": 0.2,
    "blue": 0.2,
    "black": 0.2,
    "red": 0.2,
    "green": 0.2
  },
  "entropy": 2.322,
  "progress": { "answered": 0, "total": 24 }
}

Step 2: Answer questions

The user answers each question on a scale of 1-7:

1 = Strongly Disagree
4 = Neutral
7 = Strongly Agree

Append the answer and send all answers so far:

curl -X POST https://soultrace.co/api/agent \
  -H "Content-Type: application/json" \
  -d '{"answers": [{"questionId": 42, "score": 6}]}'

Keep accumulating answers. Each response gives the next question.

Step 3: Get results

After 24 answers, the response automatically returns the final result:

{
  "status": "complete",
  "resultId": "abc-123-def",
  "resultUrl": "https://soultrace.co/en/results/abc-123-def",
  "distribution": {
    "white": 0.15,
    "blue": 0.35,
    "black": 0.25,
    "red": 0.10,
    "green": 0.15
  },
  "entropy": 1.89,
  "archetype": {
    "key": "blue-black",
    "name": "Strategist",
    "alignmentScore": 87.3,
    "coreDynamic": "...",
    "strengths": ["..."],
    "weaknesses": ["..."]
  },
  "topMatches": [
    { "key": "blue-black", "name": "Strategist", "alignmentScore": 87.3 },
    { "key": "blue", "name": "Rationalist", "alignmentScore": 82.1 },
    { "key": "black-blue", "name": "Operator", "alignmentScore": 78.5 }
  ],
  "shadowColors": [
    { "color": "red", "score": 0.10 },
    { "color": "green", "score": 0.15 }
  ],
  "progress": { "answered": 24, "total": 24 }
}

Agent Interaction Protocol

When a user asks to take the personality test:

Start by calling the API with {"answers": []}.
Present each question to the user clearly. Tell them to answer 1-7 (1=Strongly Disagree, 4=Neutral, 7=Strongly Agree).
Collect the user's numeric answer (1-7). If they give a non-numeric or descriptive answer, map it to the scale:
- "strongly disagree" / "not at all" → 1
- "disagree" / "not really" → 2
- "slightly disagree" → 3
- "neutral" / "maybe" / "sometimes" → 4
- "slightly agree" → 5
- "agree" / "yes" → 6
- "strongly agree" / "absolutely" → 7
Accumulate answers and send ALL previous answers plus the new one each time.
After all 24 questions, present the results with:
- Their archetype name and alignment score
- Their color distribution (show as percentages)
- Their top 3 archetype matches
- The link to their full results page
Never skip questions or auto-answer on behalf of the user.

Score Scale

Score	Meaning
1	Strongly Disagree
2	Disagree
3	Slightly Disagree
4	Neutral
5	Slightly Agree
6	Agree
7	Strongly Agree

The 5 Colors

Color	Drive	Essence
White	Structure, fairness	Order, responsibility
Blue	Understanding, mastery	Curiosity, precision
Black	Agency, achievement	Ambition, strategy
Red	Intensity, expression	Passion, honesty
Green	Connection, growth	Belonging, patience

Rate Limits

100 requests per hour per IP
Each test requires 25 requests (1 start + 24 answers)
Maximum ~4 complete tests per hour

Error Handling

Status	Meaning
400	Invalid request body or answers format
429	Rate limit exceeded (check `Retry-After` header)
500	Server error

API Info

GET https://soultrace.co/api/agent

Returns API metadata (version, question count, score range).