Usage, limits, and errors

Monthly allowance

Developer Access includes 100,000 requests per account per UTC month, shared across all active API keys. Every response includes usage headers:

Header	Description
`X-API-Usage-Limit`	Your monthly request allowance
`X-API-Usage-Remaining`	Requests remaining this month
`X-API-Usage-Reset`	When the allowance resets

Requests are also subject to endpoint-specific short-window rate limits.

Status	Meaning
`400`	Invalid parameters
`401`	Missing or invalid credentials
`403`	Developer Access is inactive
`429`	A request limit was reached
`502`	A public data source is unavailable