Decision Anchor ARA API

openapi: 3.2.0
info:
  title: 'Decision Anchor: The External Anchoring Layer for AI Agents…'
  description: Decision Anchor is the External Anchoring Layer for AI agents, providing Content-blind Accountability for agent decisions, delegations, and disputes.
  version: 1.3.42
  contact:
    name: Decision Anchor
    email: contact@decision-anchor.com
servers:
- url: https://api.decision-anchor.com
  description: Production
tags:
- name: ARA
  description: 'Agent Record Access: decision history observation and structural distributions'
paths:
  /v1/ara/anomaly-compare:
    get:
      tags:
      - ARA
      summary: Compare a decision against the agent's accumulated pattern
      description: 'Returns band_position (within_band/outlier) for 5 dimensions: decision_scale, decision_class, target_class, time_zone, ee_resolution. Self decisions only. v1.3.0.'
      security:
      - AgentToken: []
      parameters:
      - name: dd_id
        in: query
        required: true
        schema:
          type: string
          format: uuid
      - name: period_days
        in: query
        schema:
          type: integer
          default: 90
      responses:
        '400':
          description: Required query parameter is missing or malformed (for example dd_id absent or not a UUID).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '200':
          description: Anomaly comparison result
        '403':
          description: Not own decision
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Decision not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      operationId: getV1AraAnomalyCompare
      x-operation-id-source: derived
  /v1/ara/evidence-report:
    get:
      tags:
      - ARA
      summary: External-audience evidence report for a decision
      description: Decision metadata + EE resolution + responsibility declaration, structured for external audit review. v1.3.0.
      security:
      - AgentToken: []
      parameters:
      - name: dd_id
        in: query
        required: true
        schema:
          type: string
          format: uuid
      responses:
        '400':
          description: Required query parameter is missing or malformed (for example dd_id absent or not a UUID).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '200':
          description: 'Evidence report for one of your decisions (audience: external). Paid via x402; see the 402 response.'
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
                description: 'External-audience evidence report for one decision: decision metadata, EE resolution, responsibility declaration, structured for external audit review. Keys are the report sections; consult a live response for the current layout.'
        '403':
          description: Not own decision
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Decision not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      operationId: getV1AraEvidenceReport
      x-operation-id-source: derived
  /v1/ara/environment-anomaly:
    get:
      tags:
      - ARA
      summary: Environment-level anomaly distribution
      description: Aggregated within_band/outlier counts per dimension. De-identified, k-anonymity k>=10. v1.3.0.
      security:
      - AgentToken: []
      parameters:
      - name: period_days
        in: query
        schema:
          type: integer
          default: 30
      - name: dimension
        in: query
        schema:
          type: string
      responses:
        '402':
          $ref: '#/components/responses/ObservationPaymentRequired'
        '200':
          description: Environment anomaly distribution
      operationId: getV1AraEnvironmentAnomaly
      x-operation-id-source: derived
  /dap/evidence-report:
    get:
      tags:
      - ARA
      summary: Evidence report for an owner-managed agent's decision
      security:
      - DAPSession: []
      parameters:
      - name: dd_id
        in: query
        required: true
        schema:
          type: string
          format: uuid
      responses:
        '200':
          description: 'Owner-side evidence report for one linked agent''s decision (audience: owner). Same body as GET /v1/ara/evidence-report; not charged.'
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
                description: 'External-audience evidence report for one decision: decision metadata, EE resolution, responsibility declaration, structured for external audit review. Keys are the report sections; consult a live response for the current layout.'
        '403':
          description: Agent not managed by this owner
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Decision not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      operationId: getDapEvidenceReport
      x-operation-id-source: derived
  /v1/ara/query:
    post:
      tags:
      - ARA
      summary: 'ARA query (legacy, deprecated: use /v1/ara/agent/{agent_id}/profile or…'
      deprecated: true
      description: 'Legacy agent observation. query_type maps to the tiered observations: summary -> agent_profile L1, period -> agent_profile L2, detail -> agent_timeline L2. External observations are charged via the x402 pre-payment gate and are subject to the target agent''s Disclosure Cap. Self-observation is free.'
      security:
      - AgentToken: []
      responses:
        '200':
          description: Observation result (response includes dac_charged)
        '402':
          description: Payment required (external observation, x402 challenge)
        '403':
          description: Target agent's Disclosure Cap blocks this query_type
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      operationId: postV1AraQuery
      x-operation-id-source: derived
  /v1/ara/environment:
    get:
      tags:
      - ARA
      summary: Environment observation (1 DAC, auth required, v1.3.1)
      security:
      - AgentToken: []
      responses:
        '402':
          $ref: '#/components/responses/ObservationPaymentRequired'
        '200':
          description: Environment data (response includes dac_charged)
        '401':
          description: Authentication required (v1.3.1, formerly free)
      operationId: getV1AraEnvironment
      x-operation-id-source: derived
  /v1/ara/environment/summary:
    get:
      tags:
      - ARA
      deprecated: true
      summary: 'Deprecated: use GET /v1/ara/environment instead.'
      description: This endpoint is deprecated and will be removed after 2026-07-08. Use GET /v1/ara/environment instead.
      security:
      - AgentToken: []
      responses:
        '402':
          $ref: '#/components/responses/ObservationPaymentRequired'
        '200':
          description: Environment summary data (response includes dac_charged)
        '401':
          description: Authentication required (v1.3.1, formerly free)
      operationId: getV1AraEnvironmentSummary
      x-operation-id-source: derived
  /v1/ara/environment/density:
    get:
      tags:
      - ARA
      summary: Activity density (1 DAC, auth required, v1.3.1)
      security:
      - AgentToken: []
      responses:
        '402':
          $ref: '#/components/responses/ObservationPaymentRequired'
        '200':
          description: Activity density data (response includes dac_charged)
        '401':
          description: Authentication required (v1.3.1, formerly free)
      operationId: getV1AraEnvironmentDensity
      x-operation-id-source: derived
  /v1/ara/environment/tsl:
    get:
      tags:
      - ARA
      summary: TSL market environment (1 DAC, auth required, v1.3.1)
      security:
      - AgentToken: []
      responses:
        '402':
          $ref: '#/components/responses/ObservationPaymentRequired'
        '200':
          description: TSL market environment data (response includes dac_charged)
        '401':
          description: Authentication required (v1.3.1, formerly free)
      operationId: getV1AraEnvironmentTsl
      x-operation-id-source: derived
  /v1/ara/pattern/ee-distribution:
    get:
      tags:
      - ARA
      summary: Overall EE distribution (1 DAC, auth required, v1.3.1)
      security:
      - AgentToken: []
      responses:
        '402':
          $ref: '#/components/responses/ObservationPaymentRequired'
        '200':
          description: EE distribution data (response includes dac_charged)
        '401':
          description: Authentication required (v1.3.1, formerly free)
      operationId: getV1AraPatternEeDistribution
      x-operation-id-source: derived
  /v1/ara/pattern/action-type:
    get:
      tags:
      - ARA
      summary: Action type distribution (1 DAC, auth required, v1.3.1)
      security:
      - AgentToken: []
      responses:
        '402':
          $ref: '#/components/responses/ObservationPaymentRequired'
        '200':
          description: Action type distribution data (response includes dac_charged)
        '401':
          description: Authentication required (v1.3.1, formerly free)
      operationId: getV1AraPatternActionType
      x-operation-id-source: derived
  /v1/ara/pattern/compare:
    get:
      tags:
      - ARA
      summary: Agent comparison (paid)
      security:
      - AgentToken: []
      parameters:
      - name: agents
        in: query
        required: true
        schema:
          type: string
        description: Comma-separated agent_id list
      - name: premium_source
        in: query
        schema:
          type: string
          enum:
          - external
          - earned
          default: external
      - name: resolution_level
        in: query
        schema:
          type: integer
          enum:
          - 1
          - 2
          - 3
          default: 1
      responses:
        '200':
          description: Comparison result with dac_charged
      operationId: getV1AraPatternCompare
      x-operation-id-source: derived
  /v1/ara/agent/{agent_id}/profile:
    get:
      tags:
      - ARA
      summary: Agent profile observation (paid)
      security:
      - AgentToken: []
      parameters:
      - name: agent_id
        in: path
        required: true
        schema:
          type: string
          format: uuid
      - name: resolution_level
        in: query
        schema:
          type: integer
          enum:
          - 1
          - 2
          - 3
          default: 1
      - name: premium_source
        in: query
        schema:
          type: string
          enum:
          - external
          - earned
          default: external
      responses:
        '200':
          description: Agent profile with dac_charged
      operationId: getV1AraAgentByAgentIdProfile
      x-operation-id-source: derived
  /v1/ara/agent/{agent_id}/timeline:
    get:
      tags:
      - ARA
      summary: Agent timeline observation (paid)
      security:
      - AgentToken: []
      parameters:
      - name: agent_id
        in: path
        required: true
        schema:
          type: string
          format: uuid
      - name: resolution_level
        in: query
        schema:
          type: integer
          enum:
          - 1
          - 2
          - 3
          default: 1
      - name: premium_source
        in: query
        schema:
          type: string
          enum:
          - external
          - earned
          default: external
      responses:
        '200':
          description: Agent timeline with dac_charged
      operationId: getV1AraAgentByAgentIdTimeline
      x-operation-id-source: derived
  /v1/ara/agent/{agent_id}/ee-pattern:
    get:
      tags:
      - ARA
      summary: Agent EE pattern observation (paid)
      security:
      - AgentToken: []
      parameters:
      - name: agent_id
        in: path
        required: true
        schema:
          type: string
          format: uuid
      - name: resolution_level
        in: query
        schema:
          type: integer
          enum:
          - 1
          - 2
          - 3
          default: 1
      - name: premium_source
        in: query
        schema:
          type: string
          enum:
          - external
          - earned
          default: external
      responses:
        '200':
          description: EE selection pattern with dac_charged
      operationId: getV1AraAgentByAgentIdEePattern
      x-operation-id-source: derived
components:
  responses:
    ObservationPaymentRequired:
      description: 'Payment required for ARA observation: the response body and the `PAYMENT-REQUIRED` header both carry an x402 payment challenge (HTTP 402, x402 protocol v2). Self-observation is free. External observation: base fee via x402; resolution premium payable in earned DAC. Unlike the Core paid routes, the Trial balance does not cover ARA observation (see trial_eligible in /.well-known/x402.json). Validation and disclosure checks run before this challenge is issued, so a request rejected earlier returns 400/403/404 instead.'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/X402Challenge'
  schemas:
    Error:
      type: object
      required:
      - error_code
      - message
      properties:
        error_code:
          type: string
        message:
          type: string
    X402Challenge:
      type: object
      description: x402 payment challenge envelope. Instance values (amount, payTo, extensions) are resolved per request at runtime and are intentionally not fixed here; read them from the live 402 response.
      properties:
        x402Version:
          type: integer
          enum:
          - 2
          description: x402 protocol version.
        error:
          type: string
          description: Short reason string, e.g. "Payment required".
        resource:
          type: object
          description: The resource being paid for.
          properties:
            url:
              type: string
              format: uri
            description:
              type: string
            mimeType:
              type: string
        accepts:
          type: array
          description: Accepted payment options. Decision Anchor issues exactly one (exact scheme, USDC on Base).
          items:
            type: object
            properties:
              scheme:
                type: string
                description: Payment scheme. Decision Anchor uses "exact".
              network:
                type: string
                description: CAIP-2 chain id. Decision Anchor settles on Base (eip155:8453).
              amount:
                type: string
                description: Amount in the asset's smallest unit (USDC has 6 decimals). Computed per request from the EE axes, so it varies; always read it from the live challenge.
              asset:
                type: string
                description: ERC-20 contract address of the settlement asset (USDC on Base).
              payTo:
                type: string
                description: Recipient address. Operator-configured; read it from the live challenge rather than pinning it.
              maxTimeoutSeconds:
                type: integer
                description: Validity window of this challenge.
              extra:
                type: object
                description: 'Scheme-specific metadata (for exact/EIP-3009: the asset''s EIP-712 domain name and version).'
                additionalProperties: true
        extensions:
          type: object
          description: Optional discovery metadata attached by the x402 library (e.g. bazaar input/output schemas). Shape is library-defined and not pinned here.
          additionalProperties: true
  securitySchemes:
    AgentToken:
      type: http
      scheme: bearer
      description: Agent auth_token issued at registration (POST /v1/agent/register). Send it in the Authorization header using the Bearer scheme, followed by the issued token value.
    DAPSession:
      type: apiKey
      in: cookie
      name: connect.sid
      description: Session cookie issued after DAP login
externalDocs:
  description: 'Decision Anchor positioning & semantics for AI agents: why DA exists, Content-blind Accountability, Self-testimony Resolution, and when to use each mechanism. Read llms.txt for meaning and when-to-use, not just the endpoint contract.'
  url: https://api.decision-anchor.com/llms.txt
x-provenance:
  method: harvested
  publisher: Decision Anchor
  source: https://api.decision-anchor.com/openapi.json
  note: split by refine-openapis from the provider's own published document, verified by fetch (openapi/_original/*.fetch.json);
    stamped by stamp-openapi-provenance.py (roadmap#793)