REST APIs
48 endpoints for apps, CI pipelines and agent runtimes. JSON in, JSON out, documented in OpenAPI, no key required.
Limits
The dedicated /api/<slug>/ endpoints need no key and have no per-request quota; abusive traffic is throttled at the edge and responses carry no X-RateLimit headers. The unified runtime at /api/tools/run/ enforces a per-identity budget and returns X-RateLimit-* on every response. CORS is open on both.
Agent integrations
OpenAPI spec, skills bundles, the WebMCP manifest and the runtime endpoint in one place.
OpenAPI spec
One specification covering the runtime and every dedicated endpoint.
LLM pricing data
AI model prices, cache rates, context windows and output limits as static JSON and CSV, free under CC BY 4.0.
Documented APIs
Token Counter API
Count tokens and estimate costs across current GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Muse and Qwen models using vendor-verified pricing.
- GET /api/token-counter/
- POST /api/token-counter/
Schema Validator API
Validate tool schemas against OpenAI, Anthropic, MCP, and OpenAPI provider rules.
- POST /api/schema-validator/
JSON Schema Generator API
Infer JSON schemas from example data for OpenAI, Anthropic, MCP, or generic use.
- POST /api/schema-generator/
Format Detective API
Detect data formats and convert between JSON, CSV, XML, YAML, TOML, and more.
- GET /api/format-detective/detect/
- GET /api/format-detective/convert/
Structured Diff API
Compare text, JSON, or YAML with structured change tracking.
- POST /api/structured-diff/
Cron Expression API
Parse, validate, and build cron expressions with human-readable descriptions.
- GET /api/cron-expression/parse/
- GET /api/cron-expression/build/
Regex Tester API
Test regex patterns with match extraction and explanation.
- GET /api/regex-tester/
- POST /api/regex-tester/
QR Code Generator API
Generate QR codes in SVG or PNG format.
- GET /api/qr-code/
- POST /api/qr-code/
Color Palette API
Generate color palettes and convert between hex, RGB, and HSL.
- GET /api/color-palette/generate/
- GET /api/color-palette/convert/
HTML & Markdown Converter API
Convert between HTML and Markdown.
- GET /api/html-markdown/
- POST /api/html-markdown/
More endpoints
38 more tools with dedicated REST API endpoints at /api/{slug}/. GET or POST, JSON response, CORS enabled.
API Header Builder & cURL Generator
/api/api-header-builder/
API Response Mocker
/api/api-response-mocker/
ASCII Art Generator
/api/ascii-art-generator/
Byte & Data Unit Converter
/api/byte-converter/
chmod Calculator
/api/chmod-calculator/
Color Contrast Checker
/api/color-contrast-checker/
Color Converter
/api/color-palette/convert/
Cron Expression Tester
/api/cron-expression/parse/
CSS Specificity Calculator
/api/css-specificity-calculator/
CSS Units Converter
/api/css-units-converter/
CSV ↔ JSON Converter
/api/csv-json/
cURL Converter
/api/curl-converter/
Docker Compose Validator
/api/docker-compose-validator/
ENV File Validator
/api/env-file-validator/
HTML Entity Encoder
/api/html-entity-encoder/
HTML Formatter & Viewer
/api/html-formatter/
HTML to JSX Converter
/api/html-to-jsx/
HTTP Cookie Builder
/api/http-cookie-builder/
IP & Subnet Calculator
/api/subnet-calculator/
JSON to Go Struct
/api/json-to-go/
JSON to Kotlin Data Class
/api/json-to-kotlin/
JSON to Python Dataclass
/api/json-to-python/
JSON to Rust Serde
/api/json-to-rust-serde/
JSON to TypeScript Converter
/api/json-to-typescript/
JSON to Zod Schema
/api/json-to-zod/
JWT Decoder & Inspector
/api/jwt-decoder/
Log Parser & Highlighter
/api/log-parser/
Lorem Ipsum Generator
/api/lorem-ipsum-generator/
Number Base Converter
/api/number-base-converter/
OpenAPI to TypeScript Generator
/api/openapi-to-typescript/
Password Generator
/api/password-generator/
Shell Command Explainer
/api/shell-command-explainer/
SQL Formatter & Beautifier
/api/sql-formatter/
Text Case Converter
/api/text-case-converter/
Unix Timestamp Converter
/api/timestamp-converter/
UUID Generator
/api/uuid-generator/
XML Formatter & Viewer
/api/xml-formatter/
YAML ↔ JSON Converter
/api/yaml-json/
Machine-readable catalog: /api/apis.json. Each API also serves its own /openapi.yaml.