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

Environment Variables

export ABNORMAL_API_TOKEN="your-api-token"
export ABNORMAL_MCP_URL="https://mcp.wyre.ai/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

API Paths

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

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

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

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

Error Response Format

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

Common Error Scenarios

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: 2