> ## Documentation Index > Fetch the complete documentation index at: https://usefoil.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # List visitor fingerprints > Requires the `fingerprints:list` secret-key scope. ## OpenAPI ````yaml /api-reference/openapi.json get /v1/fingerprints openapi: 3.1.0 info: title: Foil API version: '2026-03-25' description: >- Customer-facing Foil server APIs for sessions, visitor fingerprints, organizations, and API keys. servers: - url: https://api.usefoil.com description: Production security: [] tags: - name: Sessions description: Durable session readback endpoints. - name: Visitor fingerprints description: Durable visitor fingerprint readback endpoints. - name: Organizations description: Organization lifecycle endpoints. - name: API Keys description: Organization API key lifecycle endpoints. - name: Gate description: >- Registry, organization-owned services, signup sessions, agent tokens, and dashboard login sessions. - name: Gate Webhooks description: Outbound Gate webhook delivery contracts. - name: Webhooks description: Manage webhook endpoints, subscriptions, and outgoing event delivery. - name: Events description: Inspect organization events and their webhook delivery attempts. paths: /v1/fingerprints: get: tags: - Visitor fingerprints summary: List visitor fingerprints description: Requires the `fingerprints:list` secret-key scope. operationId: listVisitorFingerprints parameters: - name: limit in: query schema: type: integer minimum: 1 maximum: 200 default: 50 example: 50 - name: cursor in: query schema: type: string example: >- eyJ2IjoxLCJzY29yZWRBdCI6IjIwMjYtMDQtMTBUMDY6NDI6NDIuNTE0WiIsInJvd0lkIjoiMTc3In0 - name: search in: query schema: type: string example: arm - name: sort in: query schema: type: string enum: - seen_count - first_seen example: seen_count responses: '200': description: Visitor fingerprint list response. content: application/json: schema: $ref: '#/components/schemas/VisitorFingerprintListResponse' example: data: - object: visitor_fingerprint id: vid_7cyvmdfjs3rzznf8m65v3bv51m lifecycle: first_seen_at: '2026-03-01T18:22:11.000Z' last_seen_at: '2026-03-24T20:00:05.000Z' seen_count: 14 expires_at: '2026-03-24T20:00:05.000Z' latest_request: user_agent: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: 203.0.113.10 storage: cookies: true local_storage: true indexed_db: true service_worker: true window_name: true anchors: webgl_hash: '123456789' parameters_hash: '-1234567890' audio_hash: '1234567890' pagination: limit: 50 has_more: false next_cursor: >- eyJ2IjoxLCJzY29yZWRBdCI6IjIwMjYtMDQtMTBUMDY6NDI6NDIuNTE0WiIsInJvd0lkIjoiMTc3In0 meta: request_id: req_cf147349a4134208aebb8c70e25fb7e1 '401': description: Missing or invalid API key. content: application/json: schema: $ref: '#/components/schemas/ApiErrorEnvelope' example: error: code: request.validation_failed message: Observation payload failed validation. status: 1 retryable: true request_id: req_cf147349a4134208aebb8c70e25fb7e1 docs_url: https://app.acme.co/signup details: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry '403': description: Secret key required. content: application/json: schema: $ref: '#/components/schemas/ApiErrorEnvelope' example: error: code: request.validation_failed message: Observation payload failed validation. status: 1 retryable: true request_id: req_cf147349a4134208aebb8c70e25fb7e1 docs_url: https://app.acme.co/signup details: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry '422': description: Invalid query parameters. content: application/json: schema: $ref: '#/components/schemas/ApiErrorEnvelope' example: error: code: request.validation_failed message: Observation payload failed validation. status: 1 retryable: true request_id: req_cf147349a4134208aebb8c70e25fb7e1 docs_url: https://app.acme.co/signup details: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry components: schemas: VisitorFingerprintListResponse: type: object additionalProperties: false required: - data - pagination - meta properties: data: type: array items: $ref: '#/components/schemas/VisitorFingerprintSummary' example: object: visitor_fingerprint id: vid_7cyvmdfjs3rzznf8m65v3bv51m lifecycle: first_seen_at: '2026-03-01T18:22:11.000Z' last_seen_at: '2026-03-24T20:00:05.000Z' seen_count: 14 expires_at: '2026-03-24T20:00:05.000Z' latest_request: user_agent: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: 203.0.113.10 storage: cookies: true local_storage: true indexed_db: true service_worker: true window_name: true anchors: webgl_hash: '123456789' parameters_hash: '-1234567890' audio_hash: '1234567890' example: - object: visitor_fingerprint id: vid_7cyvmdfjs3rzznf8m65v3bv51m lifecycle: first_seen_at: '2026-03-01T18:22:11.000Z' last_seen_at: '2026-03-24T20:00:05.000Z' seen_count: 14 expires_at: '2026-03-24T20:00:05.000Z' latest_request: user_agent: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: 203.0.113.10 storage: cookies: true local_storage: true indexed_db: true service_worker: true window_name: true anchors: webgl_hash: '123456789' parameters_hash: '-1234567890' audio_hash: '1234567890' pagination: $ref: '#/components/schemas/CursorPagination' example: limit: 50 has_more: false next_cursor: >- eyJ2IjoxLCJzY29yZWRBdCI6IjIwMjYtMDQtMTBUMDY6NDI6NDIuNTE0WiIsInJvd0lkIjoiMTc3In0 meta: $ref: '#/components/schemas/ResponseMeta' example: request_id: req_cf147349a4134208aebb8c70e25fb7e1 example: data: - object: visitor_fingerprint id: vid_7cyvmdfjs3rzznf8m65v3bv51m lifecycle: first_seen_at: '2026-03-01T18:22:11.000Z' last_seen_at: '2026-03-24T20:00:05.000Z' seen_count: 14 expires_at: '2026-03-24T20:00:05.000Z' latest_request: user_agent: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: 203.0.113.10 storage: cookies: true local_storage: true indexed_db: true service_worker: true window_name: true anchors: webgl_hash: '123456789' parameters_hash: '-1234567890' audio_hash: '1234567890' pagination: limit: 50 has_more: false next_cursor: >- eyJ2IjoxLCJzY29yZWRBdCI6IjIwMjYtMDQtMTBUMDY6NDI6NDIuNTE0WiIsInJvd0lkIjoiMTc3In0 meta: request_id: req_cf147349a4134208aebb8c70e25fb7e1 ApiErrorEnvelope: type: object additionalProperties: false required: - error properties: error: $ref: '#/components/schemas/PublicError' example: code: request.validation_failed message: Observation payload failed validation. status: 1 retryable: true request_id: req_cf147349a4134208aebb8c70e25fb7e1 docs_url: https://app.acme.co/signup details: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry example: error: code: request.validation_failed message: Observation payload failed validation. status: 1 retryable: true request_id: req_cf147349a4134208aebb8c70e25fb7e1 docs_url: https://app.acme.co/signup details: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry VisitorFingerprintSummary: type: object additionalProperties: false required: - object - id - lifecycle - latest_request - storage - anchors properties: object: const: visitor_fingerprint example: visitor_fingerprint id: $ref: '#/components/schemas/FingerprintId' example: vid_7cyvmdfjs3rzznf8m65v3bv51m lifecycle: $ref: '#/components/schemas/VisitorFingerprintLifecycle' example: first_seen_at: '2026-03-01T18:22:11.000Z' last_seen_at: '2026-03-24T20:00:05.000Z' seen_count: 14 expires_at: '2026-03-24T20:00:05.000Z' latest_request: $ref: '#/components/schemas/VisitorFingerprintLatestRequest' example: user_agent: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: 203.0.113.10 storage: $ref: '#/components/schemas/VisitorFingerprintStorage' example: cookies: true local_storage: true indexed_db: true service_worker: true window_name: true anchors: $ref: '#/components/schemas/VisitorFingerprintAnchors' example: webgl_hash: '123456789' parameters_hash: '-1234567890' audio_hash: '1234567890' example: object: visitor_fingerprint id: vid_7cyvmdfjs3rzznf8m65v3bv51m lifecycle: first_seen_at: '2026-03-01T18:22:11.000Z' last_seen_at: '2026-03-24T20:00:05.000Z' seen_count: 14 expires_at: '2026-03-24T20:00:05.000Z' latest_request: user_agent: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: 203.0.113.10 storage: cookies: true local_storage: true indexed_db: true service_worker: true window_name: true anchors: webgl_hash: '123456789' parameters_hash: '-1234567890' audio_hash: '1234567890' CursorPagination: type: object additionalProperties: false required: - limit - has_more properties: limit: type: integer minimum: 1 maximum: 200 example: 50 has_more: type: boolean example: false next_cursor: type: string example: >- eyJ2IjoxLCJzY29yZWRBdCI6IjIwMjYtMDQtMTBUMDY6NDI6NDIuNTE0WiIsInJvd0lkIjoiMTc3In0 example: limit: 50 has_more: false next_cursor: >- eyJ2IjoxLCJzY29yZWRBdCI6IjIwMjYtMDQtMTBUMDY6NDI6NDIuNTE0WiIsInJvd0lkIjoiMTc3In0 ResponseMeta: type: object additionalProperties: false required: - request_id properties: request_id: $ref: '#/components/schemas/RequestId' example: req_cf147349a4134208aebb8c70e25fb7e1 example: request_id: req_cf147349a4134208aebb8c70e25fb7e1 PublicError: type: object additionalProperties: false required: - code - message - status - retryable - request_id properties: code: type: string x-foil-known-values-ref: '#/components/schemas/KnownPublicErrorCode' example: request.validation_failed message: type: string example: Observation payload failed validation. status: type: integer example: 1 retryable: type: boolean example: true request_id: $ref: '#/components/schemas/RequestId' example: req_cf147349a4134208aebb8c70e25fb7e1 docs_url: type: string format: uri example: https://app.acme.co/signup details: $ref: '#/components/schemas/ApiErrorDetails' example: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry example: code: request.validation_failed message: Observation payload failed validation. status: 1 retryable: true request_id: req_cf147349a4134208aebb8c70e25fb7e1 docs_url: https://app.acme.co/signup details: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry FingerprintId: type: string pattern: ^vid_[0123456789abcdefghjkmnpqrstvwxyz]{26}$ example: vid_7cyvmdfjs3rzznf8m65v3bv51m VisitorFingerprintLifecycle: type: object additionalProperties: false required: - first_seen_at - last_seen_at - seen_count - expires_at properties: first_seen_at: type: string format: date-time example: '2026-03-01T18:22:11.000Z' last_seen_at: type: string format: date-time example: '2026-03-24T20:00:05.000Z' seen_count: type: integer minimum: 0 example: 14 expires_at: type: string format: date-time example: '2026-03-24T20:00:05.000Z' example: first_seen_at: '2026-03-01T18:22:11.000Z' last_seen_at: '2026-03-24T20:00:05.000Z' seen_count: 14 expires_at: '2026-03-24T20:00:05.000Z' VisitorFingerprintLatestRequest: type: object additionalProperties: false required: - user_agent - ip_address properties: user_agent: type: string example: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: type: string example: 203.0.113.10 example: user_agent: >- Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 ip_address: 203.0.113.10 VisitorFingerprintStorage: type: object additionalProperties: false required: - cookies - local_storage - indexed_db - service_worker - window_name properties: cookies: type: boolean example: true local_storage: type: boolean example: true indexed_db: type: boolean example: true service_worker: type: boolean example: true window_name: type: boolean example: true example: cookies: true local_storage: true indexed_db: true service_worker: true window_name: true VisitorFingerprintAnchors: type: object additionalProperties: false required: - webgl_hash - parameters_hash - audio_hash properties: webgl_hash: type: - string - 'null' example: '123456789' parameters_hash: type: - string - 'null' example: '-1234567890' audio_hash: type: - string - 'null' example: '1234567890' example: webgl_hash: '123456789' parameters_hash: '-1234567890' audio_hash: '1234567890' RequestId: type: string pattern: ^req_[0-9a-f]{32}$ example: req_cf147349a4134208aebb8c70e25fb7e1 ApiErrorDetails: type: object properties: fields: type: array items: $ref: '#/components/schemas/ApiFieldIssue' example: name: Acme Growth Workspace issue: required expected: string received: any_of example: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: type: array items: type: string example: verified example: - verified header_name: type: string example: x-forwarded-for parameter_set: type: string example: browser_fingerprint next_action: type: string enum: - retry - new_session - reload_bundle - contact_support example: retry additionalProperties: true example: fields: - name: Acme Growth Workspace issue: required expected: string received: any_of allowed_values: - verified header_name: x-forwarded-for parameter_set: browser_fingerprint next_action: retry ApiFieldIssue: type: object additionalProperties: false required: - name - issue properties: name: type: string example: Acme Growth Workspace issue: type: string example: required expected: type: string example: string received: anyOf: - type: string example: '0' - type: number example: 1.5 - type: boolean example: true - type: 'null' example: null example: any_of example: name: Acme Growth Workspace issue: required expected: string received: any_of ````