Tools for building and consuming APIs — No sign-up

Pixozip

LiveWatched 12d

Image compression API and free browser tool that converts images to JPEG XL/AVIF at up to 90% smaller with no visible quality loss.

Watch out · EU-hosted, files auto-deleted after 24h

FreeNo sign-up

What to know▼

How it works: Drag-and-drop browser tool plus a production API with SDKs and CMS plugins
What's different: Combines a no-signup web tool and a full production API in one, unlike TinyPNG or Squoosh separately
Pricing: Free browser tool; paid API
Best for: Developers needing both quick manual compression and an automated pipeline
Watch out: EU-hosted, files auto-deleted after 24h

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Tool that captures incoming webhooks exactly as received and replays them byte-for-byte to your local machine with valid signatures, for developers testing integrations, instead of waiting for a provider to refire an event.

No sign-up

What to know▼

How it works: Captures headers, body, and signature, encrypts at rest, and replays single, batch, or ordered sequences with signature verification (Simple HMAC, Svix, Stripe, Square) still passing.
What's different: Ships an MCP server so Claude Code and Cursor can capture, inspect, and replay webhooks directly.
Best for: Developers who need to repeatedly test webhook-triggered code without waiting on the real provider.

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Maptoolkit.org - free vector map server

LiveWatched 7d

Lets developers add customizable vector maps to their projects instead of paying for commercial map APIs with sign-ups and rate limits.

FreeNo sign-upOpen source

What to know▼

How it works: Vector tile server built on OpenStreetMap and MapLibre with 3D terrain and hillshading.
Pricing: free, no API keys, no request limits

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Sirenic

LiveWatched 11d

A pay-per-call API returning official French/EU company KYB data: identity, officers, financials and sanctions screening.

No sign-up

What to know▼

How it works: one call returns a full KYB file including BODACC alerts and sanctions checks
Pricing: pay-per-call in USDC via x402, no account or API key
Best for: developers/AI agents needing French or EU company verification

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MCP-Bridge

LiveWatched 13d

A free, browser-based tool that converts OpenAPI specifications into ready-to-use MCP server configurations, with no backend or signup required.

FreeNo sign-upNothing to install

What to know▼

How it works: Paste or upload an OpenAPI spec and get an MCP config, registry entry, or bundle in the browser.

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All Rest api

LiveWatched 8d

Free browser-based PDF and photo editing tools (edit, compress, convert, OCR) that never upload files, for privacy-conscious users avoiding paid software or sign-ups.

FreeNo sign-up

What to know▼

How it works: 25+ tools run 100% in browser
What's different: no uploads, no sign-up

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fwd.gr — Programmable URL Shortener

LiveWatched 12d

Programmable link shortener bundled with 30+ free developer utilities like webhook inspectors, HMAC verifiers and UTM builders.

FreeNo sign-up

What to know▼

How it works: link management platform plus standalone free dev tools, no signup needed for the tools
Pricing: tools free; account only needed for link management
Best for: developers and marketers needing quick diagnostic utilities

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SDKCraft

LiveWatched 19d

A free, open-source CLI and web tool that turns an OpenAPI spec into a ready-to-use client SDK in TypeScript, Python, Go, Dart or Java — a developer tool, not an API service.

FreeNo sign-upOpen source

What to know▼

How it works: Turns an OpenAPI spec into a production-ready SDK in TypeScript, Python, Go, Dart or Java, with a code preview, ZIP download, a CLI (npx sdkcraft), API change detection, and an AI documentation generator.
What's different: Free, open source and requires no signup.
Pricing: Free and open source.
Best for: Developers who need a client SDK generated from an existing OpenAPI spec instead of writing one by hand.

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101Tool

LiveWatched 12d

A free no-signup browser toolkit for testing REST, GraphQL and WebSocket APIs, with local collection runs and format conversion.

Watch out · PDFs and API credentials stay local, not team-synced

FreeNo sign-up

What to know▼

How it works: Test APIs, import Postman/OpenAPI collections, run local collection tests, convert JSON to TypeScript/Go/Python
Pricing: free, no signup
Best for: developers needing an API testing tool without cloud storage of credentials
Watch out: PDFs and API credentials stay local, not team-synced

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Webhook Catcher

LiveWatched 22d

Spins up a disposable URL to inspect incoming webhook payloads, plus an MCP endpoint so a coding agent like Claude Code or Cursor can read captures and help debug.

FreeNo sign-up

What to know▼

How it works: Creates disposable webhook URLs to capture and inspect incoming payloads; requests can be viewed live, replayed, or forwarded to localhost.
What's different: MCP endpoint lets a coding agent like Claude Code or Cursor read captured payloads directly and help debug the failing webhook.
Pricing: Free forever.
Best for: Developers debugging webhook integrations who want no sign-up and no setup.

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