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Batch Operations

Batch endpoints let you perform multiple operations in a single API call. Use these when you need to process a training week, onboard a team, or import historical activities.

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Batch calculate

Calculate prescriptions for multiple scenarios at once. Ideal for building “training week” views or “what if” comparisons. 
POST /v1/nutrition/calculate/batch

import requests

response = requests.post(
    "https://api.saturday.fit/v1/nutrition/calculate/batch",
    headers={"Authorization": "Bearer sk_test_abc123def456"},
    json={
        "athlete_id": "ath_abc123",
        "scenarios": [
            {
                "label": "Monday easy run",
                "activity_type": "run",
                "duration_min": 45,
                "intensity_level": 3,
            },
            {
                "label": "Wednesday intervals",
                "activity_type": "run",
                "duration_min": 60,
                "intensity_level": 7,
            },
            {
                "label": "Saturday long ride",
                "activity_type": "bike",
                "duration_min": 180,
                "intensity_level": 5,
                "thermal_stress_level": 7,
            },
        ],
    },
)

results = response.json()
for result in results["results"]:
    print(f"{result['label']}: {result['carb_g_per_hr']}g carbs/hr")

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Response format

{
  "results": [
    {
      "index": 0,
      "label": "Monday easy run",
      "carb_g_per_hr": 30,
      "sodium_mg_per_hr": 300,
      "fluid_ml_per_hr": 400,
      "safety": { "confidence_score": 0.65, "warnings": [], "not_instructions": true }
    },
    {
      "index": 1,
      "label": "Wednesday intervals",
      "carb_g_per_hr": 55,
      "sodium_mg_per_hr": 400,
      "fluid_ml_per_hr": 500,
      "safety": { "confidence_score": 0.65, "warnings": [], "not_instructions": true }
    }
  ],
  "errors": [],
  "metadata": {
    "total_scenarios": 3,
    "successful": 3,
    "failed": 0,
    "request_id": "req_abc123def456"
  }
}
If individual scenarios fail, they appear in errors with the index and error detail. Successful scenarios are still returned — batch operations don’t fail atomically.

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Limits

ConstraintValue
Max scenarios per batch50
Rate limitingCounts as 1 API call per scenario

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Bulk athlete create

Onboard multiple athletes in one call. Useful for team imports or platform migrations. 
POST /v1/athletes/batch

response = requests.post(
    "https://api.saturday.fit/v1/athletes/batch",
    headers={"Authorization": "Bearer sk_test_abc123def456"},
    json={
        "athletes": [
            {
                "external_id": "user-001",
                "name": "Alice Runner",
                "weight_kg": 58,
                "fitness_level": "advanced",
                "primary_sport": "run",
            },
            {
                "external_id": "user-002",
                "name": "Bob Cyclist",
                "weight_kg": 75,
                "fitness_level": "intermediate",
                "primary_sport": "bike",
            },
            {
                "external_id": "user-003",
                "name": "Carol Triathlete",
                "weight_kg": 65,
                "fitness_level": "elite",
                "primary_sport": "bike",
            },
        ],
    },
)

results = response.json()
for athlete in results["created"]:
    print(f"Created: {athlete['name']} -> {athlete['id']}")

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Limits

ConstraintValue
Max athletes per batch100
Duplicate external_idError for that item, others continue

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Activity import

Import multiple activities for an athlete at once. Useful for backfilling historical data from other platforms. 
POST /v1/athletes/{athlete_id}/activities/import

response = requests.post(
    f"https://api.saturday.fit/v1/athletes/ath_abc123/activities/import",
    headers={"Authorization": "Bearer sk_test_abc123def456"},
    json={
        "activities": [
            {
                "type": "run",
                "name": "New Year's Day 10K",
                "duration_min": 48,
                "intensity_level": 7,
                "scheduled_at": "2025-01-01T09:00:00Z",
                "thermal_stress_level": 2,
            },
            {
                "type": "bike",
                "name": "Weekend group ride",
                "duration_min": 150,
                "intensity_level": 5,
                "scheduled_at": "2025-01-04T08:00:00Z",
            },
        ],
    },
)
Imported activities don’t automatically get prescriptions calculated — call the prescription endpoint for each activity that needs one, or let the athlete trigger calculations through your UI.

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Error handling in batch operations

Batch operations use partial success semantics. If 3 out of 5 items succeed and 2 fail:
  • The 3 successful items are committed
  • The 2 failed items are returned in the errors array with index, error type, and message
  • The HTTP status is 200 (not 400) because some items succeeded
{
  "created": [
    { "index": 0, "id": "ath_abc123", "name": "Alice Runner" },
    { "index": 2, "id": "ath_def456", "name": "Carol Triathlete" }
  ],
  "errors": [
    {
      "index": 1,
      "error": {
        "type": "conflict",
        "code": "duplicate_external_id",
        "message": "An athlete with external_id 'user-002' already exists"
      }
    }
  ]
}
Check both created (or results) and errors arrays to handle the response correctly.