SourceB · Customer API

Pricing API

Give your product evidence-backed model costs. Integer token math, fail-closed stale prices, zero LLM on the hot path. Free keys available now — paid entitlement tiers are not activated yet.

1. Get an API key

Mint a free key for customer integrations. Store the secret once — we only keep a hash.

2. List models

curl -s https://sourceb.app/api/pricing/models \
  -H "Authorization: Bearer sbpk_live_YOUR_KEY"

3. Calculate cost

curl -s https://sourceb.app/api/pricing/calculate \
  -H "Authorization: Bearer sbpk_live_YOUR_KEY" \
  -H "content-type: application/json" \
  -d '{
    "modelSlug": "gpt-4o-mini",
    "inputTokens": 1000000,
    "cachedInputTokens": 0,
    "outputTokens": 200000
  }'

Endpoints

GET /api/pricing/models — catalog + evidence
POST /api/pricing/calculate — deterministic totals
POST /api/pricing/keys — mint free customer key
GET /api/pricing/openapi — OpenAPI 3 spec

Auth: Authorization: Bearer … or X-SourceB-Api-Key. CORS is enabled for browser apps. Anonymous calls work for the public calculator; customer products should use a key.

UI calculator · OpenAPI JSON · Compare models