# AI tools for “Pay-per-request API” 396 matching tools; showing 24, ranked by relevance. Filters: `group=coding-development` Related categories: [ai-api](https://openaitools.app/category/ai-api.md) | # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Why it matched | Profile (Markdown) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 1 | [Treg](https://openaitools.app/tool/treg) | 452,935 | +223.4% | Freemium | One key for 4,100+ agent tools, pay per call | category: ai-api; keywords 73%; semantic match | [.md](https://openaitools.app/tool/treg.md) | | 2 | [OpenAI Platform](https://openaitools.app/tool/openai) | 234,678,639 | -9.6% | Paid | Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents. | category: ai-api; semantic match | [.md](https://openaitools.app/tool/openai.md) | | 3 | [OpenRouter](https://openaitools.app/tool/openrouter-ai) | 19,941,437 | -6.2% | Paid | One API key for hundreds of AI models from every major provider | category: ai-api; semantic match | [.md](https://openaitools.app/tool/openrouter-ai.md) | | 4 | [DeepSeek](https://openaitools.app/tool/deepseek) | 372,761,591 | +4.3% | Freemium | High-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs. | category: ai-api; semantic match | [.md](https://openaitools.app/tool/deepseek.md) | | 5 | [ApiPass](https://openaitools.app/tool/apipass-api-marketplace) | 64,237 | -8.3% | Pay-per-use / Usage-based credits | One API key for 180+ leading AI models at a fraction of official pricing | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/apipass-api-marketplace.md) | | 6 | [Flatkey](https://openaitools.app/tool/flatkey-ai) | 49,134 | -40.8% | Paid, Contact for Pricing | One API key for frontier models, 1,000+ AI tools, and one invoice | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/flatkey-ai.md) | | 7 | [Crazyrouter](https://openaitools.app/tool/crazyrouter) | 77,144 | +1.8% | Paid | One API key, hundreds of AI models behind a single endpoint | category: ai-api; keywords 71%; semantic match | [.md](https://openaitools.app/tool/crazyrouter.md) | | 8 | [Groq](https://openaitools.app/tool/groq) | 3,987,936 | +10% | Paid | Ultra-fast AI inference on the LPU and LPX platform | category: ai-api; semantic match | [.md](https://openaitools.app/tool/groq.md) | | 9 | [ZeroClick](https://openaitools.app/tool/zeroclick) | 7,747 | -45.5% | Freemium | Sell your API and services directly to AI agents | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/zeroclick.md) | | 10 | [DeepInfra](https://openaitools.app/tool/deep-infra) | 457,810 | -8.9% | Paid | Low-cost serverless inference APIs for 200+ open models | category: ai-api; keywords 73%; semantic match | [.md](https://openaitools.app/tool/deep-infra.md) | | 11 | [Chutes](https://openaitools.app/tool/chutes) | 250,187 | -15.2% | Paid | Serverless, decentralized inference for open-source AI models | category: ai-api; keywords 73%; semantic match | [.md](https://openaitools.app/tool/chutes.md) | | 12 | [Kie.ai](https://openaitools.app/tool/kie-ai-affordable-secure-deepseek-r1-api) | 2,275,553 | -22.4% | Pay-as-you-go | One API key for video, image, music, and chat models | category: ai-api; semantic match | [.md](https://openaitools.app/tool/kie-ai-affordable-secure-deepseek-r1-api.md) | | 13 | [AIsa](https://openaitools.app/tool/aisa) | 89,162 | -10.3% | Freemium | One key, one schema, 6,000+ APIs for your AI agents | category: ai-api; keywords 73%; semantic match | [.md](https://openaitools.app/tool/aisa.md) | | 14 | [reAPI](https://openaitools.app/tool/reapi) | 20,221 | +888.3% | Paid | One OpenAI-compatible API across image, video, chat, music and code models | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/reapi.md) | | 15 | [Wokey](https://openaitools.app/tool/wokey) | 55,092 | +202.2% | Paid | One verifiable API key for Claude, GPT, Kimi and Grok at a fraction of list price | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/wokey.md) | | 16 | [TinyFish](https://openaitools.app/tool/tinyfish) | 1,124,952 | +199.7% | Freemium, Contact for Pricing | One API key for agent-grade web search, fetch, browsing and automation | category: ai-api; semantic match | [.md](https://openaitools.app/tool/tinyfish.md) | | 17 | [SiliconFlow](https://openaitools.app/tool/siliconflow) | 276,303 | -10.5% | Pay-as-you-go | One API for fast, cost-predictable inference on LLMs and multimodal models | category: ai-api; keywords 73%; semantic match | [.md](https://openaitools.app/tool/siliconflow.md) | | 18 | [NaN Builders](https://openaitools.app/tool/nan-builders) | 47,153 | +18.7% | Subscription | Shared GPU cluster for open models, billed at a flat rate instead of per token | category: ai-api; keywords 73%; semantic match | [.md](https://openaitools.app/tool/nan-builders.md) | | 19 | [GPTunneL](https://openaitools.app/tool/gptunnel) | 1,272,003 | +11.4% | Freemium, Pay-as-you-go | One subscription hub for 200+ AI models without a VPN | category: ai-api; semantic match | [.md](https://openaitools.app/tool/gptunnel.md) | | 20 | [Apify](https://openaitools.app/tool/apify) | 4,147,762 | +3.9% | Freemium, Contact for Pricing | Run thousands of ready-made web scrapers and AI agents from one cloud platform | category: ai-api; semantic match | [.md](https://openaitools.app/tool/apify.md) | | 21 | [fal.ai](https://openaitools.app/tool/fal-ai) | 3,093,684 | -3.7% | Paid, pay-as-you-go usage-based pricing | One API for 1,500+ production-ready generative media models | category: ai-api; semantic match | [.md](https://openaitools.app/tool/fal-ai.md) | | 22 | [OrcaRouter](https://openaitools.app/tool/orcarouter) | 975,300 | -5.2% | Freemium | One OpenAI-compatible gateway for adaptive LLM routing, guardrails, and spend control | category: ai-api; semantic match | [.md](https://openaitools.app/tool/orcarouter.md) | | 23 | [Flaq AI](https://openaitools.app/tool/flaq-ai-api-platform) | 328,715 | +127.9% | Paid | One API key for the world's leading image, video and language models | category: ai-api; semantic match | [.md](https://openaitools.app/tool/flaq-ai-api-platform.md) | | 24 | [Exa](https://openaitools.app/tool/exa-ai) | 1,062,574 | +16.8% | Freemium, Contact for Pricing | Web search API and crawler built for AI agents | category: ai-api; semantic match | [.md](https://openaitools.app/tool/exa-ai.md) | Page 1 of 17 · [Next page →](https://openaitools.app/index.md?q=Pay-per-request+API&group=coding-development&page=2) For programmatic access use `https://openaitools.app/api/tools?q=…` or MCP `https://openaitools.app/api/mcp`. --- Source: https://openaitools.app/?q=Pay-per-request%20API More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)