name: FDIC BankFind API Rules
description: Operational and design rules for working with the FDIC BankFind Suite API.
api: bankfind
rules:
  - id: api-key-recommended
    description: API keys are not required but are recommended for security and request monitoring.
    severity: info
  - id: query-syntax
    description: Filters use Elasticsearch query syntax with AND, OR, exclusion (!), phrase quoting, and range brackets.
    severity: info
  - id: date-format
    description: Date filters must use yyyy-mm-dd format.
    severity: error
  - id: range-brackets
    description: Use [a TO b] for inclusive ranges and {a TO b} for exclusive ranges.
    severity: warning
  - id: response-format
    description: Set Accept header (or format query parameter) to json or csv to control output.
    severity: info
  - id: pagination
    description: Use limit and offset for stable pagination; default limit is 25.
    severity: warning
  - id: prefer-fields
    description: Use the fields parameter to limit response payload to required columns.
    severity: warning
  - id: certificate-number
    description: CERT (FDIC certificate number) is the canonical institution identifier across endpoints.
    severity: info