AI API Router Directory

Google AI Studio gives free API access to Gemini models — free input and output tokens under per-model rate limits, not a depleting credit. Current-generation Flash models (including Gemini 3.8 Flash) are free-tier eligible. Paid tiers unlock higher limits, context caching, the 50%-off Batch API, and the most advanced models on the same API; free-tier data is used by Google to improve its products, paid-tier data is not.

Estimated based on high free-tier rate limits (RPD) vs paid input/output rates for equivalent usage.

Helyx markets itself as a unified OpenAI-compatible API gateway for frontier models (Claude Opus 5, Claude Haiku 4.5, GPT-5.4 Nano, Gemini, Kimi, DeepSeek) claiming 50+ models behind one endpoint, with a published rate card of five active models including DeepSeek-V4 Pro at $0.400 in / $0.750 out per 1M tokens (50% off its $0.800/$1.50 list) and MiniMax M3 at $0.300/$1.200. Signup is Google or GitHub with no password, and the account is credited with $10.000000 free: $2.000000 instantly plus $8.000000 released on request. Paid top-ups are crypto-only (USDT, USDC, BTC, ETH, TRON) and every deposit is doubled ($5 pays $10 credit, $25 pays $50), with credits stated to never expire and no subscriptions or daily caps. The domain in this listing, helyx.ai, is dead - it returns a 404 DEPLOYMENT_NOT_FOUND from Vercel - and the live Helyx AI site is served from helyxai.space.

$10.000000 signup credit ($2.000000 instant, $8.000000 released on request) as stated on the helyxai.space homepage and pricing page; the $10 figure is the operator's own published grant, not a conversion.

OpenRouter is a unified, OpenAI-compatible API aggregating hundreds of model providers behind one key. Free model variants (:free IDs) are genuinely free with documented platform caps — 20 requests/min and 50/day for accounts that have purchased under 10 credits, 1,000/day once you've purchased 10+ — while paid variants have no platform request cap. Fallback routing, per-key credit caps, and BYOK are built in.

:free models cost $0, no card; 20 req/min; 50 :free req/day with <10 credits, 1000/day after buying $10+ credits (verified FAQ; failed reqs count). ~$1.5/mo equivalent at 50 req/day, ~1K tokens/call.

GitHub Copilot enterprise plans (Business/Enterprise) - AI coding assistant with AI-credit allowances (1,900 / 3,900 credits per user/mo), model choice across OpenAI, Anthropic, Google and select Moonshot models; Enterprise credits are org-pooled; overage at USD 0.01/credit. Copilot is not currently available for self-hosted GitHub Enterprise Server.

1 AI credit = USD 0.01; overage billed at USD 0.01 per credit.

GitHub Copilot is GitHub's AI coding assistant, sold to individuals as Free ($0), Pro ($10/user/month), Pro+ ($39/user/month) and Max ($100/user/month), and to organizations as Business ($19/user/month) and Enterprise ($39/user/month). The Free tier needs no credit card and lists 2,000 completions per month, access to Claude Haiku 4.5 and GPT-5 mini "and more", the Copilot CLI and community support; GitHub's own FAQ on the same page states Free users are limited to 2,000 completions and 50 chat requests per month, including Copilot Edits. Paid individual plans add unlimited code completion and next edit suggestions, cloud agent, code review, delegation to third-party agents (Claude Code and Codex), model selection and monthly GitHub AI Credits of $15 (Pro), $70 (Pro+) and $200 (Max).

GitHub Copilot Free is $0/user/month with 2,000 completions and 50 chat requests per month and no credit card required, stated on github.com/features/copilot/plans and its Free-plan FAQ (checked 2026-09-16).

OAuth access — sign-in with your existing account. Google Antigravity 43 models tracked (via OpenRouter catalog).

A free tier is available; the exact credit value is not quantified.

Featherless AI provides serverless access to LLMs and agent runtimes. It offers subscription-based 'Chat' plans with unlimited tokens and credit-based 'Developer' plans for API usage. Details were checked against the provider's own page at featherless.ai.

Free tier available — no credit card required

FriendliAI is a high-performance AI inference platform specializing in serving frontier open-weight models like GLM, DeepSeek, and Llama with industry-leading speed. It offers serverless Model APIs, dedicated GPU endpoints, and on-premise containers.

Free tier for serverless inference — no credit card required

Gemini for business is delivered through Google Workspace rather than as a standalone AI SKU: Gemini is included in every Workspace plan, from Starter at $7.00 per user per month (with a $5.60 introductory rate) through Business Standard at $14 per user per month on annual terms ($16.80 billed monthly) and Business Plus at $17.60 annual ($22.00 monthly), with 14-day free trials and no-commitment monthly billing. The Enterprise tier is quote-based ('Let's talk', contact sales) and adds agent management via Gemini Enterprise, agent governance, AI-powered DLP, digital sovereignty controls, eDiscovery and no minimum or maximum user limits. Standard seats include 2 TB pooled storage per user, AI in Gmail/Drive/Sheets/Meet/Vids, Gemini Notebook and Studio workflow automation.

Google offers a 14-day Google Workspace trial at no cost ('No cost for 14 days') with promotional discounts, but no dollar credit or Gemini allowance is stated on the official pricing or AI pages (checked 2026-09-16).

The Gemini app is free with a personal Google Account at 'standard limits'; Google's help centre states Gemini Apps use compute-based usage limits that refresh every 5 hours until a weekly limit is reached. Free accounts get a 32k-token context window and access to Gemini Flash-Lite, Flash and Pro models, while paid tiers raise limits (Google AI Plus 2x at $4.99/mo, AI Pro 4x at $19.99/mo, AI Ultra 5x or 20x at $99.99 and $199.99/mo) and lift the context window to 1M tokens on Pro and Ultra.

No monetary credit accompanies the free Gemini tier; Google states free access has 'standard limits' with a 32k-token context window, while paid Google AI plans are $4.99/mo (Plus), $19.99/mo (Pro) and from $99.99/mo (Ultra, 5x and 20x variants).

Google Jules is an asynchronous coding agent that clones a connected GitHub repository into a Google Cloud VM, presents a plan for approval, then returns a diff and pull request. The no-cost tier is stated as 15 tasks per day and 3 concurrent tasks, while Jules in Google AI Pro provides 100 tasks per day and 15 concurrent tasks and Jules in Google AI Ultra provides 300 tasks per day and 60 concurrent tasks. Jules is described as language agnostic but works best with JavaScript/TypeScript, Python, Go, Java and Rust projects.

The no-cost tier is stated on jules.google as 15 tasks per day and 3 concurrent tasks, described in Google's blog as 'Introductory access to Jules'; no USD credit is published and daily task caps do not convert to a dollar amount.

LiteRouter is an AI API aggregator that provides access to hundreds of models from various providers via a single OpenAI-compatible interface. It supports free models with specific daily limits and pay-as-you-go billing for premium variants.

No public free-tier information found in the source reference; treat free-tier availability as unverified rather than confirmed absent.

OpenVecta provides an AI model API with an OpenAI-compatible endpoint. It focuses on simplicity and ease of use, with reports of a free tier or trial credits available for new users. Details were checked against the provider's own page at openvecta.com.

Free credits on signup for OpenAI-compatible inference across LLMs, embeddings, and reasoning models

Regolo AI provides scalable serverless AI infrastructure with a focus on privacy and zero data retention. It serves popular open-source models (Llama, Mistral, Qwen) via an OpenAI-compatible API, offering monthly token capacity plans and a flexible free trial.

No public free-tier information found in the source reference; treat free-tier availability as unverified rather than confirmed absent.