A security-testing guide for finding authorization and data-handling flaws in APIs, the interfaces that let applications exchange data, including REST, GraphQL, and gRPC.

It helps check object and function access controls, mass assignment, excessive data exposure, login tokens, schema introspection, batching, and rate-limit bypasses.

It directs testing toward common API weaknesses instead of treating every endpoint as equally likely to fail.

hunt-api — Skill for Claude Code and Codex by Encod3d-Sec: A security-testing guide for finding authorization and data-handling flaws…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/encod3d-sec/torch/hunt-api

Any agent

npx skills add Encod3d-Sec/TORCH --skill hunt-api

Clone the repo

git clone --depth 1 https://github.com/Encod3d-Sec/TORCH

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/encod3d-sec/torch/hunt-api.svg)](https://agentmods.dev/skills/encod3d-sec/torch/hunt-api)

Your own site

<a href="https://agentmods.dev/skills/encod3d-sec/torch/hunt-api"><img src="https://agentmods.dev/badge/skills/encod3d-sec/torch/hunt-api.svg" alt="Measured on agentmods" height="20"></a>

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,897 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00060	$0.01897
Opus 5	$0.00030	$0.00949
Sonnet 5	$0.00012	$0.00379
Haiku 4.5	$0.00006	$0.00190

Measured 4d ago against content hash 8a0c34db11ba, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

hunt-api scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

**Drive it through Burp** for operator visibility. Push the load-bearing requests (the BOLA cross-account swap, the mass-assignment body, the BFLA verb/route call) into **Repeater** via `Skill(hunt-burp)` / the native Bu

skills/hunt/hunt-api/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Hunt: API Security

Assumes hunt-core for the scope gate, two-account rule, confirmation gate, enumeration limits, stop conditions, wiki protocol, FIND output, and Deadends. Do not re-derive any of that here.

Wiki

qmd_query "API REST GraphQL gRPC BOLA BFLA mass assignment excessive data exposure OWASP API Top 10" via wiki-search MCP

Hub: [[web-moc]] (live web index). Primary page: [[api-security]]. Payload arsenal: wiki/payloads/api.md. Anchors: [[api-testing]], [[graphql-attacks]]. Variants: [[grpc-web-attacks]] (gRPC-Web / protobuf transcoder abuse), [[rsql-injection]] with the [[rsql]] payload (RSQL/FIQL filter-query injection, e.g. Spring Data REST), [[rate-limit-bypass]] (header/race/distributed-source throttle bypass), [[redos]] payload (catastrophic-backtracking regex DoS in an input validator), [[jwt-attacks]] (token flaws).

For object-level authorization (BOLA/IDOR) see hunt-idor.

Attack surface signals

/api/, /v1/, /graphql, /rest/, gRPC (application/grpc, HTTP/2), Swagger UI (/swagger, /api-docs, /openapi.json), mobile/SPA backends.

Rank before testing. Not all surface is equally likely to be broken:

Undocumented endpoints present in the spec (Swagger/introspection) but never called by the UI - the classic BFLA surface; nobody tested the route the client does not exercise.
GraphQL introspection and the mutations/fields it reveals that the client never invokes.
Batching and alias endpoints - one request, many operations; per-item authorization and rate limiting are frequently applied to the request, not each operation.
Bulk and export endpoints - one call, many objects; much higher severity per finding.
Non-GET verbs on read-looking routes - GET /orders/123 authorized, PATCH/DELETE not.
Newest features - authorization middleware lags new code; a route written outside the conventions misses it.

Methodology

Setup: two accounts per hunt-core (A owns, B attacks, separate profiles). Get the spec if any - Swagger/OpenAPI, GraphQL introspection, .proto.

Read the full file on GitHub · 81 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

4d ago First seen · 81 lines · 60 tokens per session scan A 8a0c34db11ba

Subscribe to this mod's changes

hunt-api is a skill published in the GitHub repository Encod3d-Sec/TORCH (284 stars, last pushed 2d ago), licensed MIT. It adds 60 tokens to every session and 1,897 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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hunt-api