generated: '2026-08-09'
method: searched
source: >-
  https://www.neutrinoapi.com/api/api-basics/ and
  https://www.neutrinoapi.com/api/best-practice/, reconciled with the
  securitySchemes in openapi/neutrino-api-openapi-3.1.json and
  openapi/neutrino-api-swagger-2.0.json, and confirmed with a live
  unauthenticated request to https://neutrinoapi.net/ip-info on 2026-08-09
  (HTTP 403, api-error 43).
docs: https://www.neutrinoapi.com/api/api-basics/
summary:
  types:
  - apiKey
  api_key_in:
  - header
  - query
  - body
  oauth2: false
  openid_connect: false
  mutual_tls: false
  mfa_on_account: true
description: >-
  Two static API-key credentials sent together on every request: `user-id`
  identifies the account and `api-key` is one of several rotatable keys issued
  from the account dashboard. Both are declared in the OpenAPI as header apiKey
  schemes and the document's top-level `security` requires BOTH simultaneously.
  The documentation additionally allows sending them as GET query parameters or
  POST body fields, and allows collapsing them into a single combined header —
  neither of which the specification expresses.
schemes:
- name: user-id
  type: apiKey
  in: header
  parameter: user-id
  description: Your user ID — the static ID for the account; cannot be changed.
  sources:
  - openapi/neutrino-api-openapi-3.1.json
  - openapi/neutrino-api-swagger-2.0.json
- name: api-key
  type: apiKey
  in: header
  parameter: api-key
  description: One of your API keys, generated from the account dashboard.
  sources:
  - openapi/neutrino-api-openapi-3.1.json
  - openapi/neutrino-api-swagger-2.0.json
combined_header:
  header: API-Key
  format: '<user-id>:<api-key>'
  note: >-
    Documented alternative that carries both credentials in one header. Not
    expressed in either specification, so generated clients do not use it.
alternative_locations:
  - {in: query, note: 'Both values may be sent as GET query parameters (user-id, api-key).'}
  - {in: body, note: 'Both values may be sent as POST form/JSON fields. The batch /multi endpoint takes them in the JSON body.'}
key_management:
  console: https://www.neutrinoapi.com/account/login/
  multiple_keys: true
  rotation: Keys are generated and revoked from the account dashboard.
  endpoint_restriction:
    supported: true
    note: >-
      Keys can be restricted to specific endpoints — the provider's own
      best-practice guide recommends least-privilege per-key scoping, and
      separate keys per environment and per application. There is no
      machine-readable scope vocabulary, so no scopes/ artifact is emitted.
    docs: https://www.neutrinoapi.com/api/best-practice/
  self_imposed_quotas:
    supported: true
    note: An account holder can set per-key/per-endpoint daily caps; exceeding one returns api-error 31.
  account_mfa:
    supported: true
    mechanism: TOTP, compatible with major authenticator apps and hardware keys.
    since: '2022-01-19'
    note: Protects the dashboard/account, not API calls.
failure_mode:
  http_status: 403
  api_error: 43
  message: ACCESS DENIED. USER ID OR API KEY INVALID
  observed: '2026-08-09'
gaps:
  - No OAuth 2.0 or OpenID Connect — there is no delegated/third-party authorization story.
  - No published key prefix convention, so a leaked key is not identifiable by shape.
  - Credentials may travel in query strings, which is convenient and lands them in access logs and browser history.
  - No mutual TLS option for the API hosts.