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API Tools

396 best API tools and apps, curated and ranked by community upvotes on ProductCool. Updated daily as new API products launch.

OpenAI Agents API logo
OpenAI Agents API
Cloud agents, run on OpenAI's Codex harness
APIDeveloper ToolsArtificial Intelligence

OpenAI's managed version of the Codex harness to build cloud agents with one API call instead of your own orchestration. Handles long sessions, smart tool use, and subagents working in parallel. Runs on OpenAI or partner sandboxes. No extra fees beyond token and tool usage. Open source harness, public beta now.

2026-09-15
0
Elva logo
Elva
Goodbye, Postman. Your APIs have new consumers
APIDeveloper ToolsArtificial Intelligence

Developers use your APIs. Now agents do too. Elva discovers APIs from code, lets you choose what each audience can use, and runs your MCP servers with auth and analytics. Track agent activity and review changes as your code evolves

2026-09-14
223
Web Search Agents by Nimble logo
Web Search Agents by Nimble
Self-learning agents automate web research + retrieval
APIDeveloper ToolsArtificial Intelligence

Web Search Agents are expert web crawling and research agents for your specific domain (company enrichment, regulations research, etc.). They self-learn your use case to go deeper into the sources that matter most to you, giving your AI deeper and more relevant web context. To get started, give your AI this link: https://docs.nimbleway.com/agent-onboarding.md

2026-09-14
340
Cortex logo
Cortex
Turn API specs into docs, SDKs, and MCP servers
APIOpen SourceDeveloper ToolsGitHub

Cortex is an open source API knowledge layer that turns OpenAPI, AsyncAPI, GraphQL, gRPC, and OpenRPC specs into interactive documentation, typed SDKs in 11 languages, and MCP servers for AI agents.

2026-09-12
278
Cadenya logo
Cadenya
A hosted agentic loop to bring agentic possibilities to life
APIDeveloper ToolsArtificial Intelligence

Cadenya is not a framework you bolt into your application stack. It's a hosted agentic loop. You connect tools using specs you already know, like OpenAPI and MCP, and Cadenya runs the agent for you. Out of the box it handles: * Context compaction * Tool approvals * Webhooks and SSE streaming * Embeddable widgets * SDKs in four languages It's model-agnostic. Point it at OpenRouter or any OpenAI-compatible endpoint and it uses that for inference. Email [email protected] to get a free month.

2026-09-11
85
ChatGPT Images 2.5 logo
ChatGPT Images 2.5
Sharper visuals, faster flow, better creative control
Design ToolsAPIArtificial Intelligence

ChatGPT Images 2.5 is OpenAI's next-generation image model built for sharper details, faster generation, and more precise editing. It helps you turn sketches, prompts, and reference photos into polished visuals with better consistency, natural lighting, richer textures, and stronger control across every edit.

2026-09-09
269
Kopai logo
Kopai
The Cloud for AI Agents
APIDeveloper ToolsArtificial Intelligence

Kopai is the cloud for AI agents. Build the agent; we run it. Publish any agent as an API (native or OpenAI-compatible, with streaming), list it in the marketplace, or call it from your own product. Analytics count what an agent costs to run separately from what it earns. A one-command benchmark runs it against reference agents before you ship. Certification expires, and answers get re-checked. Chat and the API use the same engine, so an exported agent behaves like the one you tested.

2026-09-08
103
DocsAlot Visual Editor logo
DocsAlot Visual Editor
Create beautiful docs, by typing. No AI required.
APIWritingDeveloper Tools

Write, structure, and publish technical documentation in a visual editor with Markdown mode, AI-assisted edits, reusable components, and version history.

2026-09-06
180
Agentic Video Understanding in Gemini logo
Agentic Video Understanding in Gemini
Agentic video analysis for faster, smarter Gemini insights
APIArtificial IntelligenceVideo

Agentic video understanding is a new Gemini processing mode (3.7 Flash, 3.6 Flash, 3.5 Flash-Lite) that lets the model decide what to watch, at what speed, and through which modality, instead of a fixed frame rate. Cuts tokens by up to 88%, cost by up to 66%, boosts accuracy up to 7%, biggest wins on long-form video. Live now via Gemini API in AI Studio and Gemini Enterprise Agent Platform, just set processing to "agentic," standard pricing, no extra fee.

2026-09-06
226
x402hyve logo
x402hyve
Agent-payable AI research API via x402 USDC on Base
AIAPIx402Crypto

Live HTTP 402 API for agents: pay USDC on Base for research briefs, SEO audits, landing copy, and competitor reports. OpenAPI + x402scan listed.

2026-09-05
56
Google Gemini 3.8 Flash and Cyber logo
Google Gemini 3.8 Flash and Cyber
Next-gen Gemini for agents, reasoning, and cyber security
APIArtificial IntelligenceSecurity

Gemini 3.8 Flash and Gemini 3.8 Flash Cyber bring next-generation intelligence to agentic workflows and cybersecurity. Built for long-horizon coding, multi-step reasoning, autonomous tasks, and vulnerability detection, they deliver stronger performance at Flash speed and low cost.

2026-09-04
222
Gemini 3.8 Flash and Cyber logo
Gemini 3.8 Flash and Cyber
Next-gen Gemini for agents, reasoning, and cyber security
APIArtificial IntelligenceSecurity

Gemini 3.8 Flash and Gemini 3.8 Flash Cyber bring next-generation intelligence to agentic workflows and cybersecurity. Built for long-horizon coding, multi-step reasoning, autonomous tasks, and vulnerability detection, they deliver stronger performance at Flash speed and low cost.

2026-09-04
0
Monid logo
Monid
OpenRouter for agent tools
APIDeveloper ToolsArtificial Intelligence

We connect your AI agent to 1,800+ APIs without any subscriptions. SEO, lead gen, video/music generation, social media, stocks, market trends, on-chain data, competitor tracking, sentiment analysis, all unlocked with one key.

2026-09-02
403
Vynaris logo
Vynaris
Hosted uncensored models for security research
AISecurity ResearchDeveloper ToolsLLM Gateway

Vynaris hosts powerful uncensored models—including Qwen3.8-27B, DeepSeek-V4-Flash-0731, and Qwen3.6-35B-A3B—through an OpenAI-compatible API for authorized security testing and research.

2026-09-01
65
TrustedRouter logo
TrustedRouter
Every model with a unified interface. Privacy with proof.
APIDeveloper ToolsArtificial Intelligence

One OpenAI-compatible API for hundreds of models on attested infrastructure, end to end encryption, with Confidential routes, ZDR routes, provider failover, BYOK, and no prompt or output logs.

2026-09-01
144
StackScope logo
StackScope
See what new sites are built with, the week they launch
APIMarketingDeveloper Tools

See which sites started using Stripe, Shopify or Next.js this week. Most of what we index we find ourselves: over 2.2+ million sites from public infrastructure signals, not submitted to us, across 40,000+ technologies. When we reach a launch before the boards, we're 14.5 days early. Browsing is free. Paid plans add Stackdar alerts, API access, bulk export with published contact details, and an MCP server for Claude, ChatGPT and Cursor.

2026-08-31
116
Maritime logo
Maritime
Dedicated computers for AI agents, starting at $1/month
APIDeveloper ToolsTech

Maritime helps companies that sell AI agents give every customer an agent with its own computer. Each agent runs in an isolated, persistent VM where it can use a browser, create files, run code, and keep its state. Maritime handles the infrastructure, scaling, and automatic sleep/wake, so you don’t have to build and manage thousands of VMs yourself. Built for companies running agents at scale, starting at $1 per agent per month.

2026-08-30
95
Olostep logo
Olostep
Turn the Web into Clean Data for AI
APIDeveloper ToolsArtificial Intelligence

Olostep provides scalable web data APIs, specifically designed for the web’s second user - AI. Effortlessly turn any URL into LLM-ready Markdown, JSON, or structured data.

2026-08-30
217
Cohere Parse 5 logo
Cohere Parse 5
Turn complex docs, tables & images into AI-ready data
APIArtificial Intelligence

Parse is Cohere's document vision parsing model. It transforms unstructured data in enterprise images and documents into structured data that downstream AI agents and applications can use. Handles OCR, tables/diagrams/images, and visual grounding via bounding boxes, across 9 languages. Deploy via API, cloud, or fully on-prem/air-gapped.

2026-08-29
181
macadress logo
macadress
MAC address intelligence for apps, networks and AI agents
Web AppAPI

Look beyond the vendor name. Understand MAC addresses with IEEE block data, device-category clues, privacy-randomization signals and plain-English reasoning. Use it through the free lookup, JSON API, bulk databases, log extractor, MCP or self-hosted deployment.

2026-08-26
66
akta.pro logo
akta.pro
Private company data and signals API for the agent economy
APIDeveloper ToolsArtificial Intelligence

Private company data with 4x the depth and 2x the coverage of PitchBook, plus 100+ event signals and news across companies, industries, and topics. Source and diligence deals or make outreach lists and trigger outbound. Built for financial services and GTM teams, pay-as-you-go.

2026-08-25
355

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