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OpenAPI Specification

openapi: 3.2.0
info:
  contact:
    email: hello@agentisend.com
    url: https://agentisend.com
  description: AgentiSend is a transactional email API for AI agents.
  termsOfService: https://agentisend.com/terms
  title: AgentiSend Meta API
  version: 0.1.0
servers:
- url: https://api.agentisend.com
security:
- bearer: []
tags:
- name: Meta
paths:
  /health:
    get:
      operationId: getHealth
      responses:
        '200':
          description: Success
          headers:
            ratelimit-limit:
              $ref: '#/components/headers/RateLimitLimit'
            ratelimit-remaining:
              $ref: '#/components/headers/RateLimitRemaining'
            ratelimit-reset:
              $ref: '#/components/headers/RateLimitReset'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '500':
          $ref: '#/components/responses/InternalServerError'
      security: []
      summary: Liveness probe
      tags:
      - Meta
      x-error-codes:
      - internal_server_error
      - rate_limit_exceeded
  /openapi.json:
    get:
      operationId: getOpenapiJson
      responses:
        '200':
          description: Success
          headers:
            ratelimit-limit:
              $ref: '#/components/headers/RateLimitLimit'
            ratelimit-remaining:
              $ref: '#/components/headers/RateLimitRemaining'
            ratelimit-reset:
              $ref: '#/components/headers/RateLimitReset'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '500':
          $ref: '#/components/responses/InternalServerError'
      security: []
      summary: OpenAPI 3.1 document generated from the same schemas that validate
      tags:
      - Meta
      x-error-codes:
      - internal_server_error
      - rate_limit_exceeded
  /status:
    get:
      description: Every component reports what it actually checked; one that cannot be checked says so instead of claiming green.
      operationId: getStatus
      responses:
        '200':
          content:
            application/json:
              example:
                components: []
                status: operational
                time: '2026-09-04T09:14:00.000Z'
              schema:
                $ref: '#/components/schemas/GetStatusReply'
          description: Success
          headers:
            ratelimit-limit:
              $ref: '#/components/headers/RateLimitLimit'
            ratelimit-remaining:
              $ref: '#/components/headers/RateLimitRemaining'
            ratelimit-reset:
              $ref: '#/components/headers/RateLimitReset'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '500':
          $ref: '#/components/responses/InternalServerError'
      security: []
      summary: Public per-component health
      tags:
      - Meta
      x-error-codes:
      - internal_server_error
      - rate_limit_exceeded
  /status/history:
    get:
      description: From the first sample, a minute with no reading counts as down, and 3 or more minutes down are an outage.
      operationId: getStatusHistory
      parameters:
      - in: query
        name: days
        required: false
        schema:
          maximum: 90
          minimum: 1
          type: integer
      responses:
        '200':
          content:
            application/json:
              example:
                components: []
                from: example
                to: example
                window_days: -9007199254740991
              schema:
                $ref: '#/components/schemas/GetStatusHistoryReply'
          description: Success
          headers:
            ratelimit-limit:
              $ref: '#/components/headers/RateLimitLimit'
            ratelimit-remaining:
              $ref: '#/components/headers/RateLimitRemaining'
            ratelimit-reset:
              $ref: '#/components/headers/RateLimitReset'
        '400':
          $ref: '#/components/responses/BadRequest'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '500':
          $ref: '#/components/responses/InternalServerError'
      security: []
      summary: Daily uptime per component for 90 days, in minutes
      tags:
      - Meta
      x-error-codes:
      - internal_server_error
      - rate_limit_exceeded
      - validation_error
  /tools/dns/{domain}:
    get:
      description: No API key. 10 checks a minute from one network. Looks up SPF, DKIM, DMARC and the return-path records only, and stores nothing.
      operationId: getToolsDns
      parameters:
      - in: path
        name: domain
        required: true
        schema:
          maxLength: 253
          minLength: 1
          type: string
      responses:
        '200':
          content:
            application/json:
              example:
                domain: example
                records: []
              schema:
                $ref: '#/components/schemas/GetToolsDnsBy_domainReply'
          description: Success
          headers:
            ratelimit-limit:
              $ref: '#/components/headers/RateLimitLimit'
            ratelimit-remaining:
              $ref: '#/components/headers/RateLimitRemaining'
            ratelimit-reset:
              $ref: '#/components/headers/RateLimitReset'
        '400':
          $ref: '#/components/responses/BadRequest'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '500':
          $ref: '#/components/responses/InternalServerError'
      security: []
      summary: The DNS records a sending domain needs, and the exact records to publish
      tags:
      - Meta
      x-error-codes:
      - internal_server_error
      - invalid_parameter
      - mailbox_provider_domain
      - rate_limit_exceeded
      - validation_error
components:
  headers:
    RetryAfter:
      description: Seconds to wait before retrying. Present on every refusal the catalog marks retryable — and deliberately absent on one it does not, because a refusal waiting cannot cure must never hand a client a wait hint.
      schema:
        minimum: 1
        type: integer
    RateLimitReset:
      description: Seconds until the current window resets and the budget refills.
      schema:
        minimum: 1
        type: integer
    RateLimitLimit:
      description: Messages this API key may spend in one 60-second window.
      schema:
        minimum: 0
        type: integer
    RateLimitRemaining:
      description: Messages left in the current window.
      schema:
        minimum: 0
        type: integer
  schemas:
    GetStatusHistoryReply:
      properties:
        components:
          items:
            properties:
              availability:
                anyOf:
                - type: number
                - type: 'null'
              days:
                items:
                  properties:
                    date:
                      type: string
                    missing:
                      maximum: 9007199254740991
                      minimum: -9007199254740991
                      type: integer
                    samples:
                      maximum: 9007199254740991
                      minimum: -9007199254740991
                      type: integer
                    up:
                      maximum: 9007199254740991
                      minimum: -9007199254740991
                      type: integer
                    uptime:
                      anyOf:
                      - type: number
                      - type: 'null'
                  required:
                  - date
                  - samples
                  - missing
                  - up
                  - uptime
                  type: object
                type: array
              name:
                type: string
              outages:
                items:
                  properties:
                    from:
                      type: string
                    minutes:
                      maximum: 9007199254740991
                      minimum: -9007199254740991
                      type: integer
                    to:
                      type: string
                  required:
                  - from
                  - to
                  - minutes
                  type: object
                type: array
            required:
            - name
            - availability
            - days
            - outages
            type: object
          type: array
        from:
          type: string
        to:
          type: string
        window_days:
          maximum: 9007199254740991
          minimum: -9007199254740991
          type: integer
      required:
      - window_days
      - from
      - to
      - components
      type: object
    GetStatusReply:
      properties:
        components:
          items:
            properties:
              detail:
                type: string
              name:
                type: string
              state:
                enum:
                - operational
                - degraded
                - down
                - unknown
                type: string
            required:
            - name
            - state
            - detail
            type: object
          type: array
        status:
          enum:
          - operational
          - degraded
          - outage
          type: string
        time:
          format: date-time
          pattern: ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$
          type: string
      required:
      - status
      - time
      - components
      type: object
    GetToolsDnsBy_domainReply:
      properties:
        domain:
          type: string
        records:
          items:
            properties:
              action:
                enum:
                - add
                - edit
                - none
                - check
                type: string
              current:
                anyOf:
                - type: string
                - type: 'null'
              name:
                type: string
              note:
                anyOf:
                - type: string
                - type: 'null'
              priority:
                anyOf:
                - maximum: 9007199254740991
                  minimum: -9007199254740991
                  type: integer
                - type: 'null'
              record:
                enum:
                - SPF
                - DKIM
                - DMARC
                - RETURN_PATH
                type: string
              required:
                type: boolean
              ttl:
                maximum: 9007199254740991
                minimum: -9007199254740991
                type: integer
              type:
                enum:
                - TXT
                - MX
                type: string
              value:
                anyOf:
                - type: string
                - type: 'null'
            required:
            - record
            - name
            - type
            - value
            - ttl
            - priority
            - required
            - action
            - current
            - note
            type: object
          type: array
      required:
      - domain
      - records
      type: object
  responses:
    TooManyRequests:
      content:
        application/json:
          schema:
            properties:
              error:
                properties:
                  code:
                    description: The catalogue code. Resend error names resolve onto these — see x-resend-error-aliases at the root of this document for the table a find-replace migration follows.
                    type: string
                  docs_url:
                    type: string
                  fix:
                    type: string
                  message:
                    type: string
                  retry_after_seconds:
                    description: Seconds to wait before retrying. Present exactly when retryable is true, absent otherwise.
                    minimum: 1
                    type: integer
                  retryable:
                    description: Whether repeating the identical request could succeed later. A 429 that waiting cannot cure (daily quota, trust throttle) is false.
                    type: boolean
                required:
                - code
                - message
                - fix
                - docs_url
                - retryable
                type: object
              message:
                description: The same sentence as error.message.
                type: string
              name:
                description: The Resend error name for this code (x-resend-error-names). A validation detail that says the field is required is missing_required_field. error.code stays our catalogue code.
                type: string
              statusCode:
                description: The HTTP status. Present on every error so a Resend SDK can read it beside error.
                type: integer
            required:
            - statusCode
            - name
            - message
            - error
            type: object
      description: 'A rate, quota or ramp ceiling was reached. Codes: onboarding_daily_cap_reached, trust_throttled, invite_limit_reached, rate_ceiling_exceeded, daily_quota_exceeded, monthly_quota_exceeded, rate_limit_exceeded, support_rate_limited, appsumo_lookup_limited.'
      headers:
        ratelimit-limit:
          $ref: '#/components/headers/RateLimitLimit'
        ratelimit-remaining:
          $ref: '#/components/headers/RateLimitRemaining'
        ratelimit-reset:
          $ref: '#/components/headers/RateLimitReset'
        retry-after:
          $ref: '#/components/headers/RetryAfter'
    BadRequest:
      content:
        application/json:
          schema:
            properties:
              error:
                properties:
                  code:
                    description: The catalogue code. Resend error names resolve onto these — see x-resend-error-aliases at the root of this document for the table a find-replace migration follows.
                    type: string
                  docs_url:
                    type: string
                  fix:
                    type: string
                  message:
                    type: string
                  retry_after_seconds:
                    description: Seconds to wait before retrying. Present exactly when retryable is true, absent otherwise.
                    minimum: 1
                    type: integer
                  retryable:
                    description: Whether repeating the identical request could succeed later. A 429 that waiting cannot cure (daily quota, trust throttle) is false.
                    type: boolean
                required:
                - code
                - message
                - fix
                - docs_url
                - retryable
                type: object
              message:
                description: The same sentence as error.message.
                type: string
              name:
                description: The Resend error name for this code (x-resend-error-names). A validation detail that says the field is required is missing_required_field. error.code stays our catalogue code.
                type: string
              statusCode:
                description: The HTTP status. Present on every error so a Resend SDK can read it beside error.
                type: integer
            required:
            - statusCode
            - name
            - message
            - error
            type: object
      description: 'The request is malformed or a field failed validation. Codes: validation_error, invalid_idempotency_key, invalid_cursor, plan_not_purchasable, stripe_signature_invalid, support_upload_rejected, appsumo_license_not_confirmed, appsumo_ticket_invalid, sign_in_check_required.'
      headers:
        ratelimit-limit:
          $ref: '#/components/headers/RateLimitLimit'
        ratelimit-remaining:
          $ref: '#/components/headers/RateLimitRemaining'
        ratelimit-reset:
          $ref: '#/components/headers/RateLimitReset'
    InternalServerError:
      content:
        application/json:
          schema:
            properties:
              error:
                properties:
                  code:
                    description: The catalogue code. Resend error names resolve onto these — see x-resend-error-aliases at the root of this document for the table a find-replace migration follows.
                    type: string
                  docs_url:
                    type: string
                  fix:
                    type: string
                  message:
                    type: string
                  retry_after_seconds:
                    description: Seconds to wait before retrying. Present exactly when retryable is true, absent otherwise.
                    minimum: 1
                    type: integer
                  retryable:
                    description: Whether repeating the identical request could succeed later. A 429 that waiting cannot cure (daily quota, trust throttle) is false.
                    type: boolean
                required:
                - code
                - message
                - fix
                - docs_url
                - retryable
                type: object
              message:
                description: The same sentence as error.message.
                type: string
              name:
                description: The Resend error name for this code (x-resend-error-names). A validation detail that says the field is required is missing_required_field. error.code stays our catalogue code.
                type: string
              statusCode:
                description: The HTTP status. Present on every error so a Resend SDK can read it beside error.
                type: integer
            required:
            - statusCode
            - name
            - message
            - error
            type: object
      description: 'Something failed on our side. Codes: internal_server_error.'
      headers:
        ratelimit-limit:
          $ref: '#/components/headers/RateLimitLimit'
        ratelimit-remaining:
          $ref: '#/components/headers/RateLimitRemaining'
        ratelimit-reset:
          $ref: '#/components/headers/RateLimitReset'
    UnprocessableEntity:
      content:
        application/json:
          schema:
            properties:
              error:
                properties:
                  code:
                    description: The catalogue code. Resend error names resolve onto these — see x-resend-error-aliases at the root of this document for the table a find-replace migration follows.
                    type: string
                  docs_url:
                    type: string
                  fix:
                    type: string
                  message:
                    type: string
                  retry_after_seconds:
                    description: Seconds to wait before retrying. Present exactly when retryable is true, absent otherwise.
                    minimum: 1
                    type: integer
                  retryable:
                    description: Whether repeating the identical request could succeed later. A 429 that waiting cannot cure (daily quota, trust throttle) is false.
                    type: boolean
                required:
                - code
                - message
                - fix
                - docs_url
                - retryable
                type: object
              message:
                description: The same sentence as error.message.
                type: string
              name:
                description: The Resend error name for this code (x-resend-error-names). A validation detail that says the field is required is missing_required_field. error.code stays our catalogue code.
                type: string
              statusCode:
                description: The HTTP status. Present on every error so a Resend SDK can read it beside error.
                type: integer
            required:
            - statusCode
            - name
            - message
            - error
            type: object
      description: 'A field is well formed but was refused. Codes: missing_required_field, invalid_from_address, invalid_parameter, invalid_attachment, invalid_region, tracking_subdomain_unverified, tracking_subdomain_cannot_be_removed, domain_field_immutable, open_tracking_on_transactional, header_replaced, html_clipped_by_gmail, link_domain_listed, domain_blocklisted, mailbox_provider_domain, onboarding_shape_refused, dkim_key_mismatch, domain_check_window_expired, spf_conflict, spf_lookup_limit, review_sandbox_recipient_only, suppressed_recipient, agent_signup_refused, content_refused, recipient_blocklisted, last_owner_required, seat_limit_reached, invite_not_valid, key_budget_exceeds_plan, domain_limit_reached, webhook_endpoint_limit_reached.'
      headers:
        ratelimit-limit:
          $ref: '#/components/headers/RateLimitLimit'
        ratelimit-remaining:
          $ref: '#/components/headers/RateLimitRemaining'
        ratelimit-reset:
          $ref: '#/components/headers/RateLimitReset'
  securitySchemes:
    bearer:
      description: 'An API key, sent as Authorization: Bearer as_…'
      scheme: bearer
      type: http
externalDocs:
  description: AgentiSend docs
  url: https://agentisend.com/docs
x-resend-error-aliases:
  concurrent_idempotent_requests: idempotency_in_flight
  daily_quota_exceeded: daily_quota_exceeded
  internal_server_error: internal_server_error
  invalid_api_key: invalid_api_key
  invalid_attachment: invalid_attachment
  invalid_from_address: invalid_from_address
  invalid_idempotent_request: idempotency_payload_mismatch
  method_not_allowed: method_not_allowed
  missing_api_key: missing_api_key
  not_found: not_found
  rate_limit_exceeded: rate_limit_exceeded
  restricted_api_key: restricted_api_key
  validation_error: validation_error
x-resend-error-names:
  account_sandboxed: application_error
  account_suspended: application_error
  agent_budget_exceeded: monthly_quota_exceeded
  agent_signup_code_rejected: application_error
  agent_signup_refused: application_error
  agent_unconfirmed: application_error
  already_in_account: application_error
  approval_expired: application_error
  approval_required: application_error
  appsumo_license_inactive: application_error
  appsumo_license_linked: application_error
  appsumo_license_not_confirmed: application_error
  appsumo_lookup_limited: application_error
  appsumo_signature_invalid: application_error
  appsumo_ticket_invalid: application_error
  billing_customer_missing: application_error
  billing_not_configured: application_error
  charge_not_this_account: application_error
  contact_resubscribe_required: application_error
  content_refused: application_error
  csrf_origin_rejected: application_error
  daily_limit_reached: application_error
  daily_quota_exceeded: daily_quota_exceeded
  dedicated_ip_assigned_by_us: application_error
  dkim_key_mismatch: application_error
  dns_unreachable: application_error
  domain_already_exists: application_error
  domain_blocklisted: application_error
  domain_check_window_expired: application_error
  domain_field_immutable: application_error
  domain_limit_reached: application_error
  domain_not_claimable: application_error
  domain_not_verified: validation_error
  domain_scope_violation: application_error
  domain_sending_disabled: application_error
  domain_verified_elsewhere: application_error
  email_still_scheduled: application_error
  header_replaced: application_error
  html_clipped_by_gmail: application_error
  human_action_required: application_error
  idempotency_in_flight: concurrent_idempotent_requests
  idempotency_payload_mismatch: invalid_idempotent_request
  inbound_sender_refused: application_error
  insufficient_role: application_error
  internal_server_error: internal_server_error
  invalid_api_key: invalid_api_key
  invalid_attachment: invalid_attachment
  invalid_cursor: application_error
  invalid_from_address: invalid_from_address
  invalid_idempotency_key: application_error
  invalid_parameter: validation_error
  invalid_region: application_error
  invite_email_mismatch: application_error
  invite_limit_reached: application_error
  invite_not_valid: application_error
  key_budget_exceeds_plan: application_error
  kill_switch_active: application_error
  last_owner_required: application_error
  lifetime_sold_on_appsumo: application_error
  link_domain_listed: application_error
  mailbox_provider_domain: application_error
  method_not_allowed: method_not_allowed
  mfa_required: application_error
  missing_api_key: missing_api_key
  missing_required_field: missing_required_field
  monthly_quota_exceeded: application_error
  not_found: not_found
  onboarding_daily_cap_reached: application_error
  onboarding_recipient_not_a_member: application_error
  onboarding_sender_unavailable: application_error
  onboarding_shape_refused: application_error
  open_tracking_on_transactional: application_error
  overage_cap_reached: application_error
  overage_not_on_plan: application_error
  payload_too_large: application_error
  plan_limit_reached: monthly_quota_exceeded
  plan_not_purchasable: application_error
  portal_change_unavailable: application_error
  rate_ceiling_exceeded: rate_limit_exceeded
  rate_limit_exceeded: rate_limit_exceeded
  rate_limiter_unavailable: application_error
  recipient_blocklisted: application_error
  recipient_ramp: application_error
  restricted_api_key: restricted_api_key
  return_path_subdomain_in_use: application_error
  review_sandbox_recipient_only: application_error
  seat_limit_reached: application_error
  segment_in_use: application_error
  sending_domain_blocked: application_error
  sending_paused_everywhere: application_error
  service_unavailable: application_error
  session_expired: application_error
  session_required: application_error
  sign_in_check_required: application_error
  spf_conflict: application_error
  spf_lookup_limit: application_error
  staff_review_required: application_error
  stripe_signature_invalid: application_error
  subscription_active: application_error
  support_attachment_expired: application_error
  support_closed: application_error
  support_draft_unavailable: application_error
  support_merge_conflict: application_error
  support_rate_limited: application_error
  support_reopen_expired: application_error
  support_reply_too_soon: application_error
  support_ticket_not_found: application_error
  support_upload_rejected: application_error
  support_upload_too_large: application_error
  suppressed_recipient: application_error
  template_alias_taken: application_error
  template_in_use: application_error
  template_name_taken: application_error
  term_not_on_sale: application_error
  tracking_subdomain_cannot_be_removed: application_error
  tracking_subdomain_unverified: application_error
  trust_paused: application_error
  trust_throttled: application_error
  unsupported_media_type: application_error
  validation_error: validation_error
  webhook_endpoint_limit_reached: application_error
  young_domain_held: application_error