Abnormal Security REST API Patterns

Overview

The Abnormal Security REST API provides programmatic access to threat detection, abuse mailbox cases, account takeover protection, vendor risk assessment, and message analysis. This skill covers authentication, request patterns, pagination, filtering, rate limiting, error handling, and performance optimization.

Authentication

Bearer Token Authentication

Abnormal Security uses a static Bearer token for API authentication:

GET https://api.abnormalplatform.com/v1/threats
Authorization: Bearer YOUR_API_TOKEN
Accept: application/json

Token Management

Field	Description
Type	Static API token (no expiry rotation required)
Format	Long alphanumeric string
Header	Authorization: Bearer <token>
Scope	Full API access (determined at token creation)

Environment Variables

export ABNORMAL_API_TOKEN="your-api-token"
export ABNORMAL_MCP_URL="https://mcp.wyretechnology.com/v1/abnormal-security/mcp"

MCP Gateway Headers

When used through the MCP Gateway, credentials are passed via the Authorization header:

{
  "headers": {
    "Authorization": "Bearer ${ABNORMAL_API_TOKEN}"
  }
}

The gateway forwards this header to the Abnormal Security MCP server, which uses it to authenticate with the Abnormal API.

Base URL

Environment	Base URL
Production	https://api.abnormalplatform.com

API Paths

Service	Path	Description
Threats	/v1/threats	Threat detection data
Threat Details	/v1/threats/{threatId}	Individual threat details
Cases	/v1/cases	Abuse mailbox cases
Case Details	/v1/cases/{caseId}	Individual case details
Account Takeover	/v1/account-takeover/cases	ATO cases
Vendors	/v1/vendors	VendorBase vendor risk
Messages	/v1/threats/{threatId}/messages	Messages for a threat

Request Patterns

Standard GET Request

GET /v1/threats?pageSize=25&pageNumber=1
Authorization: Bearer <token>
Accept: application/json

GET with OData Filter

GET /v1/threats?filter=attackType eq 'BEC'&pageSize=25
Authorization: Bearer <token>
Accept: application/json

Standard Response Format

{
  "threats": [
    {
      "threatId": "184def76-3c28-4e1b-9ef0-a5abc123def4",
      "attackType": "BEC",
      "attackStrategy": "Invoice/Payment Fraud",
      "sentTime": "2026-03-25T14:30:00Z"
    }
  ],
  "pageNumber": 1,
  "total": 142,
  "nextPageNumber": 2
}

Pagination

Cursor-Based Pagination

Abnormal Security uses page-number-based pagination:

GET /v1/threats?pageSize=25&pageNumber=1

Response:

{
  "threats": [...],
  "pageNumber": 1,
  "total": 142,
  "nextPageNumber": 2
}

Pagination Parameters

Parameter	Type	Description	Default	Maximum
pageSize	int	Results per page	25	100
pageNumber	int	Page number (1-based)	1	-

Pagination Pattern

async function fetchAllPages(endpoint, params = {}) {
  const allItems = [];
  let pageNumber = 1;
  const pageSize = 100;
  let hasMore = true;

  while (hasMore) {
    const url = new URL(endpoint, 'https://api.abnormalplatform.com');
    url.searchParams.set('pageSize', pageSize.toString());
    url.searchParams.set('pageNumber', pageNumber.toString());
    Object.entries(params).forEach(([k, v]) => url.searchParams.set(k, v));

    const response = await fetch(url, {
      headers: {
        'Authorization': `Bearer ${token}`,
        'Accept': 'application/json'
      }
    });

    const data = await response.json();
    const items = data.threats || data.cases || [];
    allItems.push(...items);

    hasMore = data.nextPageNumber != null;
    pageNumber = data.nextPageNumber || pageNumber + 1;
  }

  return allItems;
}

OData Filtering

Abnormal Security supports OData-style filter expressions on list endpoints:

Filter Syntax

filter=<field> <operator> '<value>'

Supported Operators

Operator	Description	Example
eq	Equals	attackType eq 'BEC'
ne	Not equals	status ne 'Closed'
gt	Greater than	riskScore gt 70
lt	Less than	riskScore lt 30
ge	Greater than or equal	sentTime ge '2026-03-01T00:00:00Z'
le	Less than or equal	sentTime le '2026-03-27T00:00:00Z'
and	Logical AND	attackType eq 'BEC' and severity eq 'Critical'
or	Logical OR	attackType eq 'BEC' or attackType eq 'Phishing'

Date Filtering

GET /v1/threats?filter=sentTime ge '2026-03-20T00:00:00Z' and sentTime le '2026-03-27T00:00:00Z'

Combined Filters

GET /v1/threats?filter=attackType eq 'BEC' and remediationStatus eq 'Not Remediated'&pageSize=50

Rate Limiting

Rate Limit Thresholds

Limit Type	Value	Scope
Requests per minute	60	Per API token
Requests per hour	1,000	Per API token

Rate Limit Response

When rate limited, the API returns HTTP 429:

HTTP/1.1 429 Too Many Requests
Retry-After: 60

{
  "error": "Rate limit exceeded. Please retry after 60 seconds."
}

Retry Strategy

async function requestWithRetry(url, options, maxRetries = 5) {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    const response = await fetch(url, options);

    if (response.status === 429) {
      const retryAfter = parseInt(response.headers.get('Retry-After') || '60');
      const jitter = Math.random() * 5000;
      await sleep(retryAfter * 1000 + jitter);
      continue;
    }

    if (response.status === 401) {
      throw new Error('Invalid API token. Regenerate at Settings > Integrations > API.');
    }

    return response;
  }

  throw new Error('Max retries exceeded');
}

Error Handling

HTTP Status Codes

Code	Meaning	Action
200	Success	Process response
400	Bad Request	Check request format, filter syntax
401	Unauthorized	Check API token
403	Forbidden	Token lacks required permissions
404	Not Found	Entity does not exist
429	Rate Limited	Wait per Retry-After header
500	Server Error	Retry with exponential backoff
503	Service Unavailable	Temporary outage, retry later

Error Response Format

{
  "error": "Invalid filter expression",
  "message": "The field 'attackType' does not support the operator 'contains'.",
  "statusCode": 400
}

Common Error Scenarios

Error	Scenario	Resolution
Invalid token	Token revoked or miscopied	Regenerate at Settings > Integrations > API
Invalid filter	Unsupported OData expression	Check filter syntax and supported operators
Entity not found	Threat/case ID does not exist	Verify the ID via list endpoint
Permission denied	Token scope insufficient	Generate new token with required permissions
Date range error	Dates in wrong format	Use ISO 8601 format: YYYY-MM-DDTHH:MM:SSZ

Performance Optimization

Minimize API Calls

// Good: Use filters to narrow results server-side
const threats = await client.threats.list({
  filter: "attackType eq 'BEC' and sentTime ge '2026-03-20T00:00:00Z'",
  pageSize: 100
});

// Avoid: Fetching all threats and filtering client-side
const allThreats = await client.threats.list({ pageSize: 100 });
const becThreats = allThreats.filter(t => t.attackType === 'BEC');

Parallelize Independent Requests

// Good: Independent endpoints in parallel
const [threats, cases, atoCases] = await Promise.all([
  client.threats.list({ pageSize: 25 }),
  client.cases.list({ pageSize: 25 }),
  client.ato.list({ pageSize: 25 })
]);

Use Appropriate Page Sizes

• Small page size (10-25) for interactive queries
• Medium page size (50) for batch processing
• Maximum page size (100) for data export

Best Practices

1. Store tokens securely - Use environment variables, never hardcode
2. Implement retry logic - Handle 429 and 5xx errors gracefully
3. Use OData filters - Reduce response size and processing time
4. Paginate all list calls - Never assume results fit in one page
5. Monitor rate limits - Track usage to avoid throttling
6. Validate inputs - Check IDs and filter syntax before sending
7. Log API calls - Enable debugging and audit trails
8. Use ISO 8601 dates - Always include timezone (Z suffix for UTC)

Related Skills

• Abnormal Threats - Threat detection and analysis
• Abnormal Cases - Abuse mailbox case management
• Abnormal Messages - Message analysis
• Abnormal Vendors - Vendor risk assessment
• Abnormal Account Takeover - Account takeover detection