# AI tools for “API billing”

1,572 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 | [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; keywords 100%; semantic match | [.md](https://openaitools.app/tool/openrouter-ai.md) |
| 2 | [Credyt](https://openaitools.app/tool/credyt) | 5,188 | +14.1% | Freemium | Real-time monetization and usage-based billing infrastructure for AI products | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/credyt.md) |
| 3 | [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) |
| 4 | [APIMart](https://openaitools.app/tool/apimart) | 383,148 | +6.3% | Freemium, Paid | One OpenAI-compatible API for 190+ text, image, video and audio models | category: ai-api; keywords 100% | [.md](https://openaitools.app/tool/apimart.md) |
| 5 | [Claude](https://openaitools.app/tool/claude-2) | 1,253,439,413 | +23.8% | Freemium | Anthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing. | category: ai-api | [.md](https://openaitools.app/tool/claude-2.md) |
| 6 | [Sudo AI](https://openaitools.app/tool/sudo-ai) | 745 | -76.8% | Free Trial | One API for every LLM — routing, billing, and AI-native ads in a single endpoint | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/sudo-ai.md) |
| 7 | [CodeGateway](https://openaitools.app/tool/codegateway) | 3,745 | +0.6% | Free Trial, Paid | One API key, one invoice for Claude, GPT and Gemini | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/codegateway.md) |
| 8 | [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 | [.md](https://openaitools.app/tool/deepseek.md) |
| 9 | [CometAPI](https://openaitools.app/tool/cometapi) | 602,966 | +49.7% | Pay-as-you-go (credits) | One OpenAI-compatible API key for 500+ AI models | category: ai-api; keywords 100% | [.md](https://openaitools.app/tool/cometapi.md) |
| 10 | [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; keywords 100%; semantic match | [.md](https://openaitools.app/tool/flaq-ai-api-platform.md) |
| 11 | [RouterBase](https://openaitools.app/tool/routerbase) | 8,326 | +33.7% | Paid | One OpenAI-compatible API for 200+ AI models | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/routerbase.md) |
| 12 | [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) |
| 13 | [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 | [.md](https://openaitools.app/tool/openai.md) |
| 14 | [DogeSMS](https://openaitools.app/tool/dogesms) | 96,418 | -21.9% | Pay-as-you-go | Disposable and rental phone numbers for SMS verification in 180+ countries | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/dogesms.md) |
| 15 | [Veryfi](https://openaitools.app/tool/veryfi-com) | 104,470 | -11.5% | Paid, Contact for Pricing, Free | OCR and multi-modal document extraction APIs with built-in fraud detection | category: ai-api; keywords 100% | [.md](https://openaitools.app/tool/veryfi-com.md) |
| 16 | [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 100%; semantic match | [.md](https://openaitools.app/tool/nan-builders.md) |
| 17 | [Google AI Studio](https://openaitools.app/tool/google-ai-studio) | 112,620,020 | +2% | Freemium | Google's rapid prototyping IDE and developer API workbench for building multimodal applications with Gemini models. | category: ai-api | [.md](https://openaitools.app/tool/google-ai-studio.md) |
| 18 | [Best API (Beat API)](https://openaitools.app/tool/beat-api) | 4,847 | -18% | Paid | One OpenAI-compatible endpoint for OpenAI, Claude and Gemini models | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/beat-api.md) |
| 19 | [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) |
| 20 | [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 100% | [.md](https://openaitools.app/tool/crazyrouter.md) |
| 21 | [Treg](https://openaitools.app/tool/treg) | 452,935 | +223.4% | Freemium | One key for 4,100+ agent tools, pay per call | category: ai-api; semantic match | [.md](https://openaitools.app/tool/treg.md) |
| 22 | [DeepL](https://openaitools.app/tool/deepl) | 95,110,871 | -1.7% | Freemium | Enterprise-grade neural machine translation, AI writing refinement, and real-time voice translation across thirty-plus global languages. | category: ai-api | [.md](https://openaitools.app/tool/deepl.md) |
| 23 | [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% | [.md](https://openaitools.app/tool/reapi.md) |
| 24 | [Lenso.ai](https://openaitools.app/tool/lenso-ai) | 1,588,648 | -1.3% | Freemium | AI reverse image search with face, place, and duplicate detection | category: ai-api; keywords 100% | [.md](https://openaitools.app/tool/lenso-ai.md) |

Page 1 of 66 · [Next page →](https://openaitools.app/index.md?q=API+billing&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=API%20billing

More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)