# Hatchloop — Developer Tools & APIs for Humans and AI Agents

> Free, no-auth tools and REST API endpoints for developers and AI agents.
> Canonical site: https://hatchloop.dev
> Last updated: 2026-06-01

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## Browser Tools (hatchloop.dev/tools/)

All tools work in the browser at https://hatchloop.dev/tools/ and as REST API calls.
No authentication. No account. CORS open.

| Tool | URL |
|------|-----|
| LLM Token Counter | https://hatchloop.dev/tools/tokens/ |
| JWT Decoder | https://hatchloop.dev/tools/jwt/ |
| JSON Formatter | https://hatchloop.dev/tools/json/ |
| Base64 Encode/Decode | https://hatchloop.dev/tools/base64/ |
| Regex Tester | https://hatchloop.dev/tools/regex/ |
| Cron Expression Builder | https://hatchloop.dev/tools/cron/ |
| DNS Lookup | https://hatchloop.dev/tools/dns/ |
| Hash Generator (MD5/SHA) | https://hatchloop.dev/tools/hash/ |
| UUID Generator | https://hatchloop.dev/tools/uuid/ |
| URL Encoder/Decoder | https://hatchloop.dev/tools/url-encode/ |
| Timestamp Converter | https://hatchloop.dev/tools/timestamp/ |
| Password Generator | https://hatchloop.dev/tools/password/ |
| Fake Data Generator | https://hatchloop.dev/tools/fake-data/ |
| CSV ↔ JSON | https://hatchloop.dev/tools/csv-json/ |
| YAML ↔ JSON | https://hatchloop.dev/tools/yaml/ |
| Diff Viewer | https://hatchloop.dev/tools/diff/ |
| HTML Entities | https://hatchloop.dev/tools/html-entities/ |
| HTML → Markdown | https://hatchloop.dev/tools/html-to-markdown/ |
| Color Converter | https://hatchloop.dev/tools/color/ |
| Case Converter | https://hatchloop.dev/tools/case-converter/ |
| HTTP Status Codes | https://hatchloop.dev/tools/http-status/ |
| SQL Formatter | https://hatchloop.dev/tools/sql/ |
| Git Reference | https://hatchloop.dev/tools/git/ |
| Docker Reference | https://hatchloop.dev/tools/docker/ |
| Linux Commands | https://hatchloop.dev/tools/linux/ |

---

## QR Code Generator

Generate QR code PNG images from any URL or text. No auth. CORS open.

```
POST https://hatchloop.dev/qr/generate
{"url": "https://example.com", "size": 300}
→ image/png  (binary PNG, QR code)

GET  https://hatchloop.dev/qr/generate?url=https%3A%2F%2Fexample.com&size=300
→ image/png  (same, via query params)

GET  https://hatchloop.dev/qr/health
→ {"status":"ok","service":"hatchloop-qr-code"}
```

- OpenAPI spec: https://hatchloop.dev/qr/openapi.json
- Plugin manifest: https://hatchloop.dev/qr/.well-known/ai-plugin.json
- `size` optional, 64–2048px, default 300

---

## REST API

Base URL: https://hatchloop.dev/api/
All endpoints: JSON, zero auth, CORS open.

```
GET  /api/health
→ {"status":"ok","service":"hatchloop-api"}

POST /api/tools/tokens
{"text": "Count these tokens"}
→ {"approx_tokens":4,"word_count":3,"text_length":18,"models":{"claude-3":{"tokens":4,"fits_context":true},...}}

POST /api/tools/jwt
{"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."}
→ {"header":{"alg":"HS256","typ":"JWT"},"payload":{...},"signature":"..."}

GET  /api/tools/dns?domain=example.com&type=A
→ {"domain":"example.com","type":"A","records":[...]}

POST /api/tools/base64
{"text": "encode me", "action": "encode"}
→ {"result":"ZW5jb2RlIG1l","action":"encode"}

GET  /api/tools/fake?type=person&count=3
→ [{"name":"...","email":"...","phone":"..."},...]

GET  /api/tools/ip
→ {"ip":"...","city":"...","country":"...","org":"..."}
```

---

## MCP Server

Connect any MCP-compatible client (Claude Desktop, Cursor, etc.) to the Hatchloop MCP server.

**SSE endpoint:** `https://hatchloop.dev/mcp/sse`

```json
{
  "hatchloop": {
    "url": "https://hatchloop.dev/mcp/sse"
  }
}
```

Available MCP tools: token counting, JWT decoding, base64, hash, DNS lookup, fake data, IP lookup.

---

## LLM Cost Calculator

Compare pricing across all major LLM providers.

URL: https://hatchloop.dev/llm-cost/

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## MCP Server Directory

Setup guides for 100+ MCP servers with Claude Desktop config snippets.

URL: https://hatchloop.dev/mcp-servers/

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## Build Log

Week-by-week transparency log of building Hatchloop in public.

URL: https://hatchloop.dev/build-log/

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## Agent Discovery Files

- OpenAPI spec: https://hatchloop.dev/openapi.json
- Agents manifest: https://hatchloop.dev/agent-tools.json
- Sitemap: https://hatchloop.dev/sitemap.xml

## Hatchloop on Moltbook

Profile: https://www.moltbook.com/u/hatchloop

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## Notes for AI Agents

- All REST endpoints return JSON, require no auth, accept requests from any origin
- Token counter supports approximate counts compatible with Claude, GPT-4o, and Gemini Pro
- For fake data reproducibility, pass ?seed=<integer>
- MCP server uses SSE transport; session_id returned on connect, send messages to /messages/?session_id=<id>