Best Free AI API tools

A deadline-aware LLM router that reduces AI inference costs by automatically finding cheaper service tiers within a user-specified time window.

Agentcard provides agent-friendly card issuing and payment infrastructure for AI agents, enabling 5-minute setup and autonomous purchases.

UnitPay is a billing infrastructure for AI-native companies that meters usage, enables flexible pricing, and tracks margins.

AgentKey is an AI-powered tool that generates and manages secure authentication keys and tokens for AI agents and APIs.

A lean, fully-tested LLM inference server built for cheap CPU hardware, with persistent caching and an OpenAI-compatible API.

A maintained collection of agent skills for modern browser Web AI APIs including Prompt API, Language Detector, Translator, Writing Assistance, Proofreader, WebMCP, and WebNN.

A unified AI gateway providing access to 300+ leading models through one EU-hosted, GDPR-compliant API with an OpenAI SDK-compatible interface.

Unified AI API gateway providing access to top-tier LLMs, image, video, and coding models at affordable prices.

Kastra is an authorization layer for AI systems that checks every action against policy before it runs.

Frugon is a free, open-source LLM cost analyzer that identifies where your LLM bill leaks by analyzing your call logs locally.

A deadline-aware LLM router that reduces AI inference costs by automatically finding cheaper service tiers within a user-specified time window.

Agentcard provides agent-friendly card issuing and payment infrastructure for AI agents, enabling 5-minute setup and autonomous purchases.

UnitPay is a billing infrastructure for AI-native companies that meters usage, enables flexible pricing, and tracks margins.

A developer toolkit that provides a safe, reliable bridge between AI models and rich-text documents, enabling real-time, document-aware AI editing.

AgentKey is an AI-powered tool that generates and manages secure authentication keys and tokens for AI agents and APIs.

Loomal is the payments layer for agentic commerce, letting you add a paywall to any API or store so AI agents can pay automatically in USDC.

A cloud-based iOS publishing pipeline that lets AI agents build, sign, and submit apps to TestFlight and the App Store without a Mac.

A lean, fully-tested LLM inference server built for cheap CPU hardware, with persistent caching and an OpenAI-compatible API.

A maintained collection of agent skills for modern browser Web AI APIs including Prompt API, Language Detector, Translator, Writing Assistance, Proofreader, WebMCP, and WebNN.

A unified AI gateway providing access to 300+ leading models through one EU-hosted, GDPR-compliant API with an OpenAI SDK-compatible interface.

A unified API platform for LLM inference with cost optimization, routing, observability, and automatic failover.

Unified AI API gateway providing access to top-tier LLMs, image, video, and coding models at affordable prices.

Kastra is an authorization layer for AI systems that checks every action against policy before it runs.

Frugon is a free, open-source LLM cost analyzer that identifies where your LLM bill leaks by analyzing your call logs locally.

Edgee is an agent gateway that cuts token costs up to 50% by compressing, routing, and observing LLM traffic for coding agents.

AI search infrastructure designed for agents, delivering structured, secure, and high-quality data with smart intent routing.

Dike is a compliance gateway for AI products in the EU, providing audit-grade logging, human oversight, and incident reporting via a simple proxy.

An open-source, OpenAI-compatible LLM gateway you run yourself, providing a single endpoint for 40+ providers with virtual keys, budgets, and usage tracking.

A transparent proxy that shows every real tool call between your AI client and MCP servers, live in your terminal.

A secure file system and code execution sandbox for AI agents with built-in job queues, Docker isolation, and execution history.

A free AI music generator and music video maker that creates original songs in any genre and transforms them into stunning music videos with synchronized visuals.

Real-time event monitoring infrastructure for AI agents that delivers low-latency data streams and webhook notifications to trigger automated workflows.

An open protocol for capability-aware AI routing, plus a reference router that routes between local and cloud AI models based on task, cost, and latency.

A secure, portable Bash-first CLI wrapper for Groq's OpenAI-compatible API to interact with large language models from the terminal.

A drop-in proxy that routes every prompt to the best AI model in <50ms, cutting costs 40-70% with just an endpoint change.

Oxlo.ai is a privacy-first AI inference API offering request-based pricing for over 45 open-source models.

Sakana Fugu is a multi-agent system that dynamically orchestrates multiple AI models via a single API to tackle complex multi-step tasks.

Respan is an LLM engineering platform that provides a unified gateway to route, trace, evaluate, and monitor AI agents and LLM calls.

Automate social media posting and integrate with your favorite tools using Buffer's GraphQL API.

Self-hosted AI traffic proxy and local operator console for teams to control LLM token usage, enforce user limits, cache responses, and monitor AI traffic.

Hosted MCP server builder that converts REST and GraphQL APIs into AI-accessible MCP endpoints with authentication and workflow tools.

BlitzGraph is an AI-native backend that models reality in graphs, enabling agents to compose typed JSON queries without SQL or ORMs.

AIsa provides a single API key for AI agents to access 1000+ LLMs, APIs, and skills with autonomous micropayments.

FablePool is a community-driven platform for proposing and executing AI models, now supporting model flexibility via OpenRouter integration.

A service-boundary-aware coordination architecture for heterogeneous LLM code agents with versioned document store, pub-sub notifications, and diff-aware updates.

Zero.xyz gives AI agents instant access to over 4,000 tools, APIs, and services without accounts or API keys.

Venice AI is a privacy-focused platform offering uncensored access to leading AI models for text, image, video, code, and agent generation with zero data retention.

Runpod is an AI developer cloud for launching GPU pods, serverless endpoints, and clusters to build and scale AI workloads.

Uncensored AI is an AI model hub and chat platform offering access to multiple major models, including uncensored variants, plus a private-beta API.

Kie.ai is a unified AI API platform for accessing video, image, audio, and LLM models through one integration with transparent pricing.

Postly is a social media scheduling and content distribution platform with email campaigns, Bio Pages, APIs, analytics, and AI-agent workflows.

Cartesia builds fast speech AI models and voice agents for real-time text-to-speech, transcription, and interactive conversations.

Geekflare offers an AI workspace, developer APIs, and free business tools for teams and creators.

Sync. labs provides AI lip sync and visual dubbing tools to adapt video performances across languages while preserving facial detail.

LOVO is an AI voice generator and text-to-speech platform for creating realistic voiceovers, video narration, and voice cloning in 100+ languages.

Salad is a distributed GPU cloud offering low-cost, geo-distributed compute for AI, inference, training, and other GPU-heavy workloads.

Lightning AI is an AI cloud platform for building, training, and deploying models with managed GPUs, notebooks, clusters, and inference tools.

Inworld AI provides realtime voice AI tools for text-to-speech, speech-to-speech, speech-to-text, and model routing for conversational applications.

SiliconFlow is an AI cloud platform for fast inference, deployment, and fine-tuning of LLMs and multimodal models through one OpenAI-compatible API.

MachineTranslation.com is a free AI translation platform that compares 22 models to help users choose the best result.

A deadline-aware LLM router that reduces AI inference costs by automatically finding cheaper service tiers within a user-specified time window.

Agentcard provides agent-friendly card issuing and payment infrastructure for AI agents, enabling 5-minute setup and autonomous purchases.

UnitPay is a billing infrastructure for AI-native companies that meters usage, enables flexible pricing, and tracks margins.