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Fixer

CURRENCY

Foreign exchange rates and currency conversion JSON API.

Currency Data

CURRENCY

Reliable exchange rates & currency conversion for your business.

Serpstack

DEV TOOLS

Real-time SERP API for Google search results.

Mediastack

MARKETING

Live news data API for real-time headlines.

Positionstack

GEOLOCATION

Forward & reverse geocoding made simple.

IPstack

GEOLOCATION

Accurate IP geolocation and threat data.

Numverify

MARKETING

Global phone number validation & lookup.

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How to expose APIs to LLMs without breaking security

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OpenAI Function Calling: How to Connect LLMs to The Best Free APIs

Function calling turns LLMs into a bridge between users and external systems. Learn the patterns to integrate safely.

For Businesses & Teams

API Marketplace – What is an API Marketplace?

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For Businesses & Teams

Best Financial Market APIs for Real-Time Data

A practical comparison of market data APIs, rate limits, and integration patterns for production use.