Preview the credit cost of a request without executing it.

Public, no auth, no credits charged.

Request body:

{
  "method": "GET",
  "path":   "/v1/sports/baseball_mlb/odds",
  "query":  {"markets": "h2h,spreads", "regions": "us"}
}

Response:

{
  "estimated_credits": 2,
  "cost_basis": "len(markets)=2 x len(regions)=1",
  "cost_type": "variable",
  "matched_template": "/v1/sports/{sport_key}/odds",
  "description": "Multi-market multi-region odds",
  "cost_floor": 1
}

Use cases:

• Batch analysis budgeting: estimate cost of running an analysis across N events before committing.
• Tier upgrade planning: see how much a typical workflow costs before subscribing.
• SDK helper: client.estimate_cost(params) before client.get_odds(params).

For fixed-cost endpoints, this just looks up the cost. For variable-cost endpoints, it parses the query and applies the formula from _CREDIT_COSTS.

sleep_iter_48 #546.