name: Datamuse Plans and Pricing
description: |
  Commercial plan surface for the Datamuse word-finding API, captured against the
  API Commons Plans 0.1 specification. Datamuse offers a generous free
  non-commercial tier (100k requests/day, no API key) and a custom-priced
  commercial tier negotiated directly with the provider for production / customer-
  facing use cases, higher rate limits, and custom vocabularies.
url: https://raw.githubusercontent.com/api-evangelist/datamuse/main/plans/datamuse-plans-pricing.yml
created: '2026-05-29'
modified: '2026-05-29'
specificationVersion: '0.1'
provider: datamuse
currency: USD
billingCycle: negotiated
annualDiscount:
  available: false
  notes: |
    Datamuse does not publish a standard commercial price list. Annual or
    multi-year terms are part of the negotiated commercial agreement.

plans:
  - id: free-non-commercial
    name: Free Non-Commercial
    price: 0
    interval: monthly
    quota:
      requests: 100000
      window: day
    refreshCadence: real-time
    features:
      - id: words-endpoint
        included: true
      - id: suggestions-endpoint
        included: true
      - id: semantic-constraints
        included: true
      - id: phonetic-constraints
        included: true
      - id: orthographic-constraints
        included: true
      - id: relation-constraints
        included: true
      - id: context-ranking
        included: true
      - id: metadata-flags
        included: true
      - id: english-vocabulary
        included: true
      - id: spanish-vocabulary
        included: true
      - id: custom-vocabulary
        included: false
        notes: Custom vocabularies are a commercial offering.
      - id: api-key
        included: false
        notes: No API key required; access is anonymous.
      - id: https
        included: true
      - id: commercial-use
        included: false
        notes: Free tier prohibits commercial / customer-facing use.
    support: None
    overage:
      allowed: false
      notes: Excess requests beyond 100,000/day may be rate-limited without notice.

  - id: commercial
    name: Commercial
    price: null
    interval: negotiated
    quota:
      requests: negotiated
      window: negotiated
    refreshCadence: real-time
    features:
      - id: words-endpoint
        included: true
      - id: suggestions-endpoint
        included: true
      - id: semantic-constraints
        included: true
      - id: phonetic-constraints
        included: true
      - id: orthographic-constraints
        included: true
      - id: relation-constraints
        included: true
      - id: context-ranking
        included: true
      - id: metadata-flags
        included: true
      - id: english-vocabulary
        included: true
      - id: spanish-vocabulary
        included: true
      - id: custom-vocabulary
        included: true
        notes: Domain-specific hosted vocabularies (medical, legal, gaming, internal jargon, etc.).
      - id: api-key
        included: true
        notes: Issued as part of the commercial agreement when required.
      - id: https
        included: true
      - id: commercial-use
        included: true
      - id: sla
        included: true
        notes: Service-level commitments per contract.
    support: Direct
    overage:
      allowed: true
      notes: Per-contract terms.

contact:
  url: https://www.datamuse.com/api/
  notes: |
    To arrange commercial use, custom vocabularies, or elevated rate limits,
    contact Datamuse via the link on their API documentation page.