diff --git a/services/external-actor-gateway-service/openapi.yaml b/services/external-actor-gateway-service/openapi.yaml
index 1236182..d91a78b 100644
--- a/services/external-actor-gateway-service/openapi.yaml
+++ b/services/external-actor-gateway-service/openapi.yaml
@@ -19,6 +19,11 @@ security:
 components:
   callbacks: {}
   examples:
+    CreateAccountLogRequestExample:
+      description: Example values extracted from schema defaults
+      summary: CreateAccountLogRequest example
+      value:
+        type: webhook
     CreatePersonLogRequestExample:
       description: Example values extracted from schema defaults
       summary: CreatePersonLogRequest example
@@ -32,6 +37,13 @@ components:
   headers: {}
   links: {}
   parameters:
+    AccountIdPath:
+      in: path
+      name: account_id
+      description: account_id parameter
+      required: true
+      schema:
+        type: string
     AudienceIdPath:
       in: path
       name: audience_id
@@ -98,6 +110,12 @@ components:
           schema:
             $ref: "#/components/schemas/Error"
       description: Error response - covers authentication, authorization, rate limiting, and server errors
+    GetAccountResponseResponse:
+      description: Successful operation
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/GetAccountResponse"
     GetWebhookSubscriptionResponseResponse:
       description: Successful operation
       content:
@@ -111,10 +129,56 @@ components:
             $ref: "#/components/schemas/Error"
       description: Resource not found
   schemas:
+    UnnamedSchema:
+      type: string
+      minLength: 1
+      pattern: ^prospectlog_[a-z0-9]{26}$
+    AccountId:
+      type: string
+      minLength: 1
+      pattern: ^account_[a-z0-9]{26}$
+      description: Account ID
     ArraySchema:
       type: array
       items:
         $ref: "#/components/schemas/GetWebhookSubscriptionResponse"
+    CreateAccountLogRequest:
+      type: object
+      properties:
+        accountId:
+          $ref: "#/components/schemas/AccountId"
+        domain:
+          type: string
+          minLength: 1
+        name:
+          type: string
+          minLength: 1
+          maxLength: 255
+        source:
+          type: string
+          minLength: 1
+          maxLength: 100
+          description: Identifier for the upstream system sending the account activity
+        type:
+          default: webhook
+          description: Account activity type. Defaults to 'webhook' when omitted
+          type: string
+          minLength: 1
+          maxLength: 100
+        idempotencyKey:
+          type: string
+          minLength: 1
+          maxLength: 255
+        payload:
+          type: object
+          propertyNames:
+            type: string
+          additionalProperties: {}
+      required:
+        - source
+        - type
+        - payload
+      additionalProperties: false
     CreateAudienceRequest:
       type: object
       properties:
@@ -241,6 +305,195 @@ components:
         - message
         - requestId
       type: object
+    GetAccountResponse:
+      type: object
+      properties:
+        accountId:
+          $ref: "#/components/schemas/AccountId"
+        tenantId:
+          type: string
+          description: Tenant ID that owns the account
+        domain:
+          type: string
+          minLength: 1
+        name:
+          anyOf:
+            - type: string
+              minLength: 1
+              maxLength: 255
+            - type: "null"
+        createdAt:
+          $ref: "#/components/schemas/CreatedAt"
+        updatedAt:
+          $ref: "#/components/schemas/CreatedAt"
+        latestActivityAt:
+          anyOf:
+            - $ref: "#/components/schemas/CreatedAt"
+            - type: "null"
+        linkedProspects:
+          type: array
+          items:
+            type: object
+            properties:
+              prospectId:
+                $ref: "#/components/schemas/PersonId"
+              tenantId:
+                type: string
+                description: Tenant ID that owns the prospect
+              name:
+                type: string
+                minLength: 1
+                maxLength: 255
+                description: Prospect display name
+              email:
+                anyOf:
+                  - type: string
+                  - type: "null"
+              domain:
+                anyOf:
+                  - type: string
+                    minLength: 1
+                  - type: "null"
+              slug:
+                type: string
+                minLength: 1
+                maxLength: 255
+                description: Prospect routing slug
+              phoneNumber:
+                anyOf:
+                  - type: string
+                  - type: "null"
+              linkedinProfileUrl:
+                anyOf:
+                  - type: string
+                  - type: "null"
+              createdAt:
+                $ref: "#/components/schemas/CreatedAt"
+              updatedAt:
+                $ref: "#/components/schemas/CreatedAt"
+            required:
+              - prospectId
+              - tenantId
+              - name
+              - email
+              - domain
+              - slug
+              - phoneNumber
+              - linkedinProfileUrl
+              - createdAt
+              - updatedAt
+            additionalProperties: false
+      required:
+        - accountId
+        - tenantId
+        - domain
+        - name
+        - createdAt
+        - updatedAt
+        - latestActivityAt
+        - linkedProspects
+      additionalProperties: false
+    GetActivity:
+      type: object
+      properties:
+        items:
+          type: array
+          items:
+            type: object
+            properties:
+              activityId:
+                type: string
+                minLength: 1
+                description: Stable identifier for the activity item
+              activityType:
+                type: string
+                enum:
+                  - account-log-entry
+                  - prospect-log-entry
+                description: Whether the activity originated from the account itself or a linked prospect
+              accountId:
+                $ref: "#/components/schemas/AccountId"
+              accountLogId:
+                anyOf:
+                  - $ref: "#/components/schemas/UnnamedSchema"
+                  - type: "null"
+              prospectId:
+                anyOf:
+                  - $ref: "#/components/schemas/PersonId"
+                  - type: "null"
+              prospectLogId:
+                anyOf:
+                  - $ref: "#/components/schemas/UnnamedSchema"
+                  - type: "null"
+              prospectName:
+                anyOf:
+                  - type: string
+                  - type: "null"
+              source:
+                type: string
+                minLength: 1
+                maxLength: 100
+                description: Stored activity source
+              type:
+                type: string
+                minLength: 1
+                maxLength: 100
+                description: Stored activity type
+              payload:
+                type: object
+                propertyNames:
+                  type: string
+                additionalProperties: {}
+              idempotencyKey:
+                anyOf:
+                  - type: string
+                    minLength: 1
+                    maxLength: 255
+                  - type: "null"
+              createdAt:
+                $ref: "#/components/schemas/CreatedAt"
+              updatedAt:
+                anyOf:
+                  - $ref: "#/components/schemas/CreatedAt"
+                  - type: "null"
+              deletedAt:
+                anyOf:
+                  - $ref: "#/components/schemas/CreatedAt"
+                  - type: "null"
+            required:
+              - activityId
+              - activityType
+              - accountId
+              - accountLogId
+              - prospectId
+              - prospectLogId
+              - prospectName
+              - source
+              - type
+              - payload
+              - idempotencyKey
+              - createdAt
+              - updatedAt
+              - deletedAt
+            additionalProperties: false
+        totalCount:
+          type: integer
+          minimum: 0
+          maximum: 9007199254740991
+        hasMore:
+          type: boolean
+        nextOffset:
+          anyOf:
+            - type: integer
+              minimum: 0
+              maximum: 9007199254740991
+            - type: "null"
+      required:
+        - items
+        - totalCount
+        - hasMore
+        - nextOffset
+      additionalProperties: false
     GetAudience:
       type: object
       properties:
@@ -405,8 +658,6 @@ components:
               createdAt:
                 $ref: "#/components/schemas/CreatedAt"
               deletedAt:
-                "0":
-                  $ref: "#/components/schemas/CreatedAt"
                 anyOf:
                   - $ref: "#/components/schemas/CreatedAt"
                   - type: "null"
@@ -468,8 +719,6 @@ components:
           type: array
           items: {}
         deletedAt:
-          "0":
-            $ref: "#/components/schemas/CreatedAt"
           anyOf:
             - $ref: "#/components/schemas/CreatedAt"
             - type: "null"
@@ -570,6 +819,33 @@ components:
       type: string
       minLength: 1
       pattern: ^prospect_[a-z0-9]{26}$
+      description: Linked prospect ID
+    PostAccountLog:
+      type: object
+      properties:
+        accountId:
+          $ref: "#/components/schemas/AccountId"
+        accountLogId:
+          $ref: "#/components/schemas/UnnamedSchema"
+        createdAt:
+          $ref: "#/components/schemas/CreatedAt"
+        source:
+          type: string
+          minLength: 1
+          maxLength: 100
+          description: The stored account log source
+        type:
+          type: string
+          minLength: 1
+          maxLength: 100
+          description: The stored account log type
+      required:
+        - accountId
+        - accountLogId
+        - createdAt
+        - source
+        - type
+      additionalProperties: false
     PostAudience:
       type: object
       properties:
@@ -602,10 +878,7 @@ components:
         personId:
           $ref: "#/components/schemas/PersonId"
         personLogId:
-          type: string
-          minLength: 1
-          pattern: ^prospectlog_[a-z0-9]{26}$
-          description: The created person log entry ID
+          $ref: "#/components/schemas/UnnamedSchema"
         createdAt:
           $ref: "#/components/schemas/CreatedAt"
         createdPerson:
@@ -669,6 +942,17 @@ components:
         - updatedAt
         - signingSecret
       additionalProperties: false
+    UpdateAccountRequest:
+      type: object
+      properties:
+        name:
+          type: string
+          minLength: 1
+          maxLength: 255
+          description: New account name
+      required:
+        - name
+      additionalProperties: false
     UpdateWebhookSubscriptionRequest:
       type: object
       properties:
@@ -699,6 +983,90 @@ components:
       name: x-api-key
       type: apiKey
 paths:
+  /v0/account_logs:
+    post:
+      description: Create an account log entry using the authenticated API key's tenant context
+      operationId: createAccountLog
+      responses:
+        "201":
+          description: AccountLog created successfully
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/PostAccountLog"
+      summary: Create account log entry
+      tags:
+        - Account Logs
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/CreateAccountLogRequest"
+        required: true
+  /v0/accounts/{account_id}:
+    get:
+      description: Retrieve a specific account by ID.
+      operationId: getAccount
+      responses:
+        "200":
+          $ref: "#/components/responses/GetAccountResponseResponse"
+      summary: Get account by ID
+      tags:
+        - Accounts
+      parameters:
+        - $ref: "#/components/parameters/AccountIdPath"
+    patch:
+      description: Update an account by ID
+      operationId: updateAccount
+      responses:
+        "200":
+          $ref: "#/components/responses/GetAccountResponseResponse"
+      summary: Update account by ID
+      tags:
+        - Accounts
+      parameters:
+        - $ref: "#/components/parameters/AccountIdPath"
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/UpdateAccountRequest"
+        required: true
+  /v0/accounts/{account_id}/activity:
+    get:
+      description: Retrieve merged account activity, optionally including linked prospect activity
+      operationId: listAccountActivity
+      responses:
+        "200":
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/GetActivity"
+      summary: List account activity
+      tags:
+        - Account Activity
+      parameters:
+        - in: query
+          name: includeProspectActivity
+          description: includeProspectActivity parameter
+          required: false
+          schema:
+            type: string
+        - in: query
+          name: includeDeleted
+          description: includeDeleted parameter
+          required: false
+          schema:
+            type: string
+        - $ref: "#/components/parameters/LimitQuery"
+        - in: query
+          name: offset
+          description: offset parameter
+          required: false
+          schema:
+            type: number
+        - $ref: "#/components/parameters/AccountIdPath"
   /v0/pages:
     get:
       description: Retrieve a list of pages for the authenticated tenant with optional filtering and pagination
@@ -978,7 +1346,13 @@ tags:
     description: Audience management operations
   - name: Audience Versions
     description: Audience version management operations
+  - name: Accounts
+    description: Account read and update operations
+  - name: Account Activity
+    description: Merged account and linked prospect activity operations
   - name: Person Logs
     description: Person log ingestion operations
+  - name: Account Logs
+    description: Account log ingestion operations
   - name: Webhook Subscriptions
     description: Webhook subscription management operations