Cheapest MCP server for API security
What middleBrick covers
- Black-box scanning with no agents or SDK dependencies
- Risk score A–F with prioritized findings
- OpenAPI 3.x and Swagger 2.0 parsing with ref resolution
- LLM adversarial probe sets across multiple scan tiers
- Authenticated scans with header allowlisting
- Continuous monitoring with diff and alerting
What is an MCP server for API security
An MCP server for API security exposes scanning capabilities directly to AI coding assistants and language models. With middleBrick, the server runs a black-box scan that requires no agents, SDKs, or code access. Provide a target URL, receive a risk score from A to F with prioritized findings, and integrate the results into your development workflow without changing your stack.
Detection scope aligned to recognized standards
The scanner maps findings to OWASP API Top 10 (2023), supports audit evidence for SOC 2 Type II, and maps findings to PCI-DSS 4.0. Coverage spans authentication bypass, broken object level authorization, business logic abuse surfaces, input validation issues, rate limiting, data exposure, encryption misconfigurations, SSRF indicators, inventory problems, unsafe consumption patterns, and LLM/AI security probes. It also surfaces findings relevant to secure AI coding assistant usage through 18 adversarial probe types across Quick, Standard, and Deep scan tiers.
OpenAPI analysis and authenticated scanning
The scanner parses OpenAPI 3.0, 3.1, and Swagger 2.0 with recursive \$ref resolution, cross-referencing spec definitions against runtime behavior to identify undefined security schemes, sensitive fields, deprecated operations, and missing pagination. For authenticated scans, Bearer tokens, API keys, Basic auth, and cookies are supported after domain verification via DNS TXT or HTTP well-known file. Only specific headers are forwarded, ensuring controlled credential usage.
Integration options and continuous monitoring
Use the CLI (middlebrick scan <url>) for on-demand scans with JSON or text output, or the GitHub Action to gate CI/CD when scores drop below your threshold. The MCP server enables scanning from AI coding assistants such as Claude and Cursor. Pro tier adds scheduled rescans, diff detection, email alerts, HMAC-SHA256 signed webhooks, and compliance report downloads.
Pricing and safety posture
The free tier allows 3 scans per month with CLI access. Starter at 99 USD per month supports 15 APIs, monthly scans, dashboard views, email alerts, and the MCP server. Pro at 499 USD per month covers 100 APIs with continuous monitoring, GitHub Action gates, Slack or Teams alerts, and compliance reports. Enterprise starts at 2000 USD per month for unlimited APIs, custom rules, SSO, and dedicated support. The scanner uses read-only methods, blocks private and metadata endpoints, and retains customer data for 30 days after cancellation without selling or using it for model training.