Voyage AI specializes in state-of-the-art embedding models and rerankers. It provides a managed API for high-quality vector embeddings (voyage-4 family) and efficient reranking, optimized for RAG applications. Offers a highly generous free tier for developers.

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

Feifeimiao (api.feifeimiao.top) is a Chinese third-party relay service offering an OpenAI-compatible API gateway. Built on the New-API framework, it aggregates various models and focuses on providing access to tools like Codex and Claude Code for developers in the region.

$10 trial credit on signup; promotional $20 weekly-limited cards for new and existing users (weekly expiry). The core is paid subscriptions (Small ¥60 (≈$8.93)/30d ≈ $20/day, Medium ¥150 (≈$22.32)/30d ≈ $60/day).

Cun.ai is a commercial AI relay aggregator based on the New-API framework, providing access to GPT, Claude, and DeepSeek. It targets Chinese developers with localized payment methods and a substantial signup credit promotion.

Signup credit up to approx. $20.83 (RMB 140) with redemption codes.

Camel-Hub (api.camel-hub.com) is a commercial AI API relay aggregating 330+ models. It emphasizes prompt caching to reduce user costs and requires real-name verification (KYC) for full access. Free access is limited to tool-class models like Suno and Midjourney.

$20 credit granted after real-name verification.

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.

Lightning AI (LitAI) provides a unified gateway to frontier models through an OpenAI-compatible API. New users receive 40 million free tokens (approx. $15 in credits) to test models like Claude, GPT, and Gemini. Usage beyond the initial credit is billed as pay-as-you-go.

~30M free tokens per user per month (~15 credits = $15 value), no card required; credits refresh monthly and expire if unused; plus 1 free 4-CPU Studio and 10GB Drive.

NLP Cloud is an API platform offering pre-trained and custom models for summarization, classification, embeddings, ASR, speech synthesis and large language models such as GPT-OSS 120B, LLaMA 3.1 405B and ChatDolphin. Its pay-as-you-go plan has no fixed monthly cost and automatically grants a $15 free credit, then bills per request at $0.003 on CPU or $0.005 on GPU with token surcharges for the largest models. Published prepaid plans run from Starter at $29 per month (10 parallel requests) to the Large Language Models plan at $2,499 per month (50 parallel requests), with dedicated fine-tuning plans from $399 per month.

Official pricing page states that the pay-as-you-go plan automatically gives a $15 FREE credit with no fixed monthly cost (nlpcloud.com/pricing.html, checked 2026-09-16).

MonkeyAPI (monkeyapi.apimonkey.online) is an anonymous individual relay service built on the New API framework. In late 2026, the service operator reported penalties for violations and announced plans to migrate, significantly reducing quotas and referral benefits.

Previously offered registration credit and check-in/referral bonuses, but notices state it is 'cutting referral and registration quotas for cost control' and will adjust after migrating; no stable public free flagship quota.

Sarvam AI is a leading Indian AI startup focused on large-scale models for Indic languages. Their API platform provides access to the Sarvam series models for text and voice, targeting applications in the Indian market with high-performance regional language support.

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

Baichuan's open platform sells Baichuan4-family and M-series models with billing quoted per 1,000 tokens and 32K context on most SKUs: Baichuan4-Turbo at 0.015 CNY per 1K tokens with input and output combined, Baichuan4-Air at 0.00098 CNY per 1K, Baichuan4 at 0.1 CNY per 1K, and the medical M3-Plus and M3 models split input and output (0.005 / 0.009 and 0.01 / 0.03 CNY per 1K tokens). Search enhancement is metered separately at 0.03 CNY per call, and Baichuan2-53B has a documented off-peak window at half price. New accounts are described as receiving an 80 CNY gift balance valid for 3 months.

Official prices page states new accounts registered after the afternoon of 22 May 2024 receive an 80 CNY gift balance (equivalent to 10M Baichuan2-Turbo tokens) valid 3 months; converted at roughly 7.1 CNY/USD, so the USD figure is an estimate of a CNY grant.

AI21 Labs sells API access to its Jamba foundation models through AI21 Studio on usage-based pricing, with a self-serve free trial and a custom plan for volume. The free trial is published as $10 in credits for 7 days with no credit card required. Published pay-as-you-go rates are Jamba Mini at $0.2 per 1M input tokens and $0.4 per 1M output tokens, and Jamba Large at $2 per 1M input tokens and $8 per 1M output tokens. AI21 states that on Studio models an average token equals about 1 word or 6 characters of English text.

Official pricing page states a Free Trial of $10 credits for 7 days, no credit card needed (ai21.com/pricing, checked 2026-09-16).

Eden AI is a commercial AI aggregation gateway providing a single API to 500+ models. It features cost tracking, automatic fallback, and a unified format for LLMs, vision, and translation. Details were checked against the provider's own page at www.edenai.co.

$10 starter credit reported for new users.

FreeModel is a multi-model gateway that intelligently routes requests to the best-performing open models. It supports both OpenAI and Anthropic API formats and provides automatic model fallback and smart provider selection to optimize for quality.

Signup credits land instantly, no card. Community reports conflict: $10 signup credit (phone/Telegram verify) up to claims of ~$66/week (~$300 cumulative) - authenticity unconfirmed. Conservative: $10.

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.

Upstage Console provides an OpenAI-compatible API for their high-performance Solar models. It features a developer-friendly $10 signup credit and commitment-based tiers for businesses requiring higher rate limits and support.

One-time $10 credit valid for 3 months for new signups.

Tavily: search API purpose-built for AI agents — basic (1 credit) and advanced (2 credits) search, extract, map, crawl, and Research (dynamic credits). Free 1,000 credits/month refreshed on the 1st, no card; pay-as-you-go $0.008/credit; monthly plans $30-$100+ at $0.0075-$0.005/credit; enterprise custom. Free for students program.

1,000 free credits/month × $0.008/credit PAYG rate = $8.00/month equivalent (basic searches).

FreeTheAi is a free OpenAI-compatible API gateway aggregating 80+ models behind a single base URL. It operates via Discord-based key signup and daily check-ins, emphasizing persistent free access for developers and roleplay users without credit card requirements.

Fully free, no card; daily /checkin (key validation + human challenge) required before calls. Default cap 250 successful calls/day (role-based bumps) ~ $7.5/mo equivalent at ~1K tokens/call, $1/1M tokens.

Inception Labs offers a cloud inference platform for its in-house diffusion-based LLMs, such as Mercury 2 and Mercury Coder. Designed for extreme efficiency, it provides an OpenAI-compatible API that significantly undercuts GPU-based inference costs while maintaining high reasoning quality.

Free plan ≈10M tokens, officially described as ~$7–10 of credit (low end counted), no card; self-serve key at platform.inceptionlabs.ai; then PAYG (Mercury 2 ~$0.25/1M in, $0.75–1.00/1M out).

Requesty is an AI model gateway and router that aggregates over 600 models (Claude, GPT, Gemini, DeepSeek) through a single OpenAI-compatible API. It offers cost optimization, unified billing, and advanced routing features for enterprise and individual developers.

Free tier: 200 requests/day plus ~$6 signup credits (some sources say $10; conservative low end), no card required; beyond that Pro is pay-as-you-go at model cost +5%.

Brave Search API: real-time web search (LLM-optimized context, news, images, videos) and Answers endpoint, powered by Brave's independent index of 30B+ pages. 50 req/s capacity on search; $5 free credits auto-applied monthly; credit card required as anti-fraud. SOC 2 Type II attested, zero-data-retention options.

$5 free credit auto-applied to account every month (per brave.com/search/api and API dashboard pricing page).

Cerebras Inference serves open-weight models on wafer-scale CS-4 hardware — gpt-oss-120b at ~3,000 tokens/s for $0.35/$0.75 per 1M in/out, Qwen 3.8 27B at $0.99/$1.49. The self-serve developer tier is pay-as-you-go with $5 of free credit to start; the enterprise tier (production capacity, priority limits, fine-tuning) is quote-based. Also available via AWS Marketplace, OpenRouter, Hugging Face and Vercel.

Self-serve developer tier includes $5 free credit to start (pricing page, checked 2026-09-16). Replaces an older $30 figure that no longer matches the official page.

EasyMax (Easy API) is a multi-model aggregation gateway compatible with OpenAI and Claude API protocols. It focuses on stability and pricing, supporting GPT, Gemini, and image generation models. Details were checked against the provider's own page at easymax.ai.

Relay with ~5-8 free model entries on /api/pricing; V2EX promo grants $5 trial credit for forum reply (one-time, promotional). Continuous free quota limited; low-cost paid top-ups.

Firecrawl: web-to-LLM-context platform — scrape, crawl, map, search, extract, and browser Interact APIs. Credits-based: 1 credit = 1 page (scrape/crawl/map); search costs 2 credits per 10 results. Free 1,000 credits/month (500 searches) with no card; paid subs from $16-19/mo with pay-as-you-go overage in $5 increments (paid plans only).

Free 1,000 credits/mo ≈ 500 searches (2 credits per 10 results) or 1,000 pages; Firecrawl publishes no per-search dollar price for the free allocation, so value left null.

Flatkey.ai is a commercial AI API gateway aggregating over 200 official models under a single API key. It uses a prepaid pay-as-you-go model, claiming to be significantly cheaper than official pricing by leveraging high-volume enterprise agreements.

Search reports a $5 initial credit for testing.