API Guides
Gemini API Key Permission Denied: Fix 403 by Error Source (2026)
A no-retry, evidence-first workflow for AI Studio key creation, Gemini API 403 calls, keys that stopped working in 2026, and account or project escalation.
17 min
API Guides · Page 2 of 3
Integrating AI APIs: authentication, endpoints, SDKs, and production patterns.
- 65
- Articles
- Sep 23, 2026
- Last updated
API Guides
LLM API Pricing Comparison 2026: Cheapest Models by Input and Output Tokens
The cheapest LLM API model depends on input tokens, output tokens, cache hits, Batch/Flex terms, retries, and whether the output passes your workload.
11 min
API Guides
Free AI API Tiers Compared 2026: Anthropic, Groq, DeepSeek, Mistral, and Image APIs
A dated contract map for free AI API tiers: recurring free routes, starter credits, cheap paid APIs, gateway free variants, and image API testing lanes without mixing provider and platform claims.
18 min
API Guides
Grok API Pricing and Cost Guide 2026: Tokens, Free Tier, and Real Use-Case Examples
A current Grok API cost worksheet with official xAI rows, free-tier caveats, and realistic examples for chat, documents, coding, and research agents.
14 min
API Guides
Cheapest LLM API Provider: Compare Price, Quality, Latency, and Gateway Risk in 2026
DeepSeek V4 Flash is the lowest verified official paid token floor checked here, but the cheapest practical LLM API provider depends on route owner, quality threshold, retries, latency, and gateway fees.
11 min
API Guides
Nano Banana API Key Guide 2026: Official Gemini Models, Pricing, and Code
A Nano Banana API key is a Gemini API key managed through Google AI Studio. Create the key there, but keep it separate from billing, project limits, free-tier claims, and provider gateway keys before you call Nano Banana 2, Lite, or Pro.
11 min
API Guides
Gemini API Key Free in 2026: What Is Free, Where Limits Live, and Why More Keys Do Not Add Quota
You can create a Gemini API key for free in AI Studio, but that key is a credential, not a separate quota bucket. Check pricing for model eligibility and AI Studio for the live project limit before trusting 20 RPD or unlimited-key claims.
14 min
API Guides
LLM Agent API Spend Kill Switch: Stop Runaway Costs Before the Provider Call
A practical architecture for blocking runaway LLM agent API calls before more budget is consumed.
9 min
API Guides
Realtime API vs Transcription Pipeline Cost: When Live Voice Is Worth the Spend
Realtime is worth paying for when live spoken interaction is the product. For transcripts, archives, QA, summaries, and compliance, start with a transcription-first route and model the variable components separately.
13 min
API Guides
The Model `gpt-image-2` Does Not Exist: Codex Error, Status Check, and Fixes
`gpt-image-2` is documented by OpenAI; when Codex says the model does not exist, the right fix depends on the surface that returned the error.
9 min
API Guides
Doubao Seed Code: Open Source, API Model, or Coding Plan?
Doubao Seed Code spans open-source Seed-Coder weights, a hosted Volcengine API route, Coding Plan/tool access, Doubao App/TRAE usage, and benchmark pages; choose the route before testing.
10 min
API Guides
OpenAI vs Claude Cache Pricing: How Cached Tokens, Cache Writes, and Cache Reads Are Billed
OpenAI cache hits are cached input tokens; Claude separates cache writes and reads. Use this dated guide to audit repeated-context API and agent bills.
8 min
API Guides
How to Set Up DeepSeek on Janitor AI: Proxy URL, Model Name, and Error Fixes
DeepSeek works in Janitor AI only when the proxy URL, API key, and model name all come from the same route; the current setup fields, model-ID warning, and first-error diagnosis path matter before prompt tuning.
10 min
API Guides
Grok 4.3 API Guide: Model ID, Pricing, Migration, and Test Plan
Grok 4.3 is listed as an xAI API model as of May 7, 2026, but production teams should verify route, price, aliases, context, migration, and same-task results first.
12 min
API Guides
OpenAI API Connection Error: Fix APIConnectionError by Testing the Route First
APIConnectionError is fastest to fix when you first prove whether the request returned server evidence. Use this runbook to test the route, tune SDK controls, and escalate with useful evidence.
9 min
API Guides
OpenAI API Quota Exceeded Error: Fix insufficient_quota Without Chasing the Wrong Limit
If your OpenAI API call says You exceeded your current quota, do not start by rotating keys or adding retries. First check billing, prepaid balance, monthly budget, organization, project, and model access.
9 min
API Guides
Claude API vs OpenAI API Pricing: Which Is Cheaper for Your Workload?
OpenAI is usually the cheaper default for high-volume simple API work when GPT-5.4 mini is enough, while Claude becomes a serious contender for long-context, agentic, and cache-heavy workflows. The right answer depends on route, tokens, cache, batch, tools, and current account access.
7 min
API Guides
Gemini API vs Vertex AI API: Which Google Gemini Route Should You Use?
Use the Gemini Developer API for fast starts and simple app integrations. Use Gemini API in Vertex AI when IAM, audit logs, VPC controls, centralized billing, regional controls, or Cloud operations are part of the job.
7 min
API Guides
Grok Speech-to-Text API: Endpoint, Pricing, Streaming, and When to Use It (April 2026)
Grok Speech-to-Text is now an official xAI API. Use REST for files, WebSocket for live audio, and keep Voice Agent API and TTS for different jobs.
13 min
API Guides
Grok Voice Agent API: Endpoint, Pricing, and Quickstart Guide (April 2026)
xAI's developer-facing realtime voice route is the Grok Voice Agent API at `wss://api.x.ai/v1/realtime`. The current public self-serve surface shows `$0.05 / min`, `100` concurrent sessions per team, and a `30` minute max session. Use a server API key on trusted backends, ephemeral tokens for browser or mobile clients, and switch to the separate TTS API when you only need one-shot speech generation.
14 min
API Guides
Is the Nano Banana Pro API Key Free? Official AI Studio, Pricing, and Billing Reality (2026)
The Nano Banana Pro API key is free to create in Google AI Studio, but the official `gemini-3-pro-image-preview` API is not on the free tier as of April 19, 2026. Billing and quota belong to the project and billing account behind the key, and AI Studio is where current limits appear.
13 min
API Guides
How to Increase Nano Banana Pro API Quota in 2026: What Tier 3 Actually Changes
You do not upgrade Nano Banana Pro itself to Tier 3. You upgrade the Gemini project that serves `gemini-3-pro-image-preview`. This guide explains the current public tier ladder, what higher tiers change for Nano Banana Pro workloads, and what to do before T3 lands.
16 min
API Guides
Best Free AI Video API in 2026: Which Ones Are Actually Free?
If you want one free AI video API for real text-to-video or image-to-video prototyping, start with Magic Hour. If you need conversational or avatar video, Tavus is the better free route and HeyGen is the easiest small trial. If you mean official model APIs like Veo, OpenAI's public video API, or Runway's public API, the honest answer is that those routes are mostly paid.
10 min
API Guides
Gemini API Key Free for Students? What's Actually Free in 2026
Students can still get a free Gemini API key in 2026, but not through a special education-only program. The real path is Google AI Studio's standard Gemini API free tier, while the student-facing Google AI Pro offer is a separate Gemini app bundle that currently does not list API credits.
11 min