Feature

Caching & Conditional Requests

ETags, cache headers, and conditional GETs.

34 providers 986 APIs 32 declared variants

Cache-control headers, ETags, and If-None-Match support let clients avoid refetching unchanged data. Directly reduces both latency and billable call volume.

34 API providers on the APIs.io network offer caching & conditional requests. The highest-rated are GitHub Actions, Anthropic, Fastly, Pipedream, Amazon API Gateway.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 6 Complete, well-documented, and agent-ready
GitHub Actions APIs for GitHub Actions - automation and CI/CD platform. 11 APIs 79.4 Anthropic Anthropic is an AI safety company and creator of the Claude family of large language models (Opus, Sonnet, ... 24 APIs 75.0 Fastly Fastly is an edge cloud platform that helps customers create great digital experiences quickly, securely, a... 80 APIs 73.3 Pipedream Pipedream is a developer-centric integration platform providing three product lines: Workflows (code-level ... 16 APIs 72.8 Amazon API Gateway Amazon API Gateway is a fully managed service that makes it easy to create, publish, maintain, monitor, and... 13 APIs 71.4 GitHub The GitHub REST API allows developers to programmatically interact with GitHub resources including reposito... 350 APIs 71.3
Strong 10 Solid coverage with minor gaps
Amazon Storage Gateway AWS Storage Gateway is a hybrid cloud storage service that provides on-premises access to virtually unlimit... 95 APIs 65.4 Modal Modal is a serverless cloud platform for AI and data workloads. Modal lets developers write ordinary Python... 17 APIs 64.8 Plandex Plandex is an open-source, terminal-based AI coding agent designed to take on large, multi-step software de... 15 APIs 64.7 CircleCI CircleCI is a continuous integration and continuous delivery (CI/CD) platform that automates software build... 18 APIs 62.1 Inworld AI Inworld AI is a real-time voice AI infrastructure provider. The Inworld platform delivers text-to-speech, s... 7 APIs 61.6 VesselFinder VesselFinder is a maritime intelligence company operating a global AIS vessel-tracking network (terrestrial... 10 APIs 59.5 Amazon CodeBuild AWS CodeBuild is a fully managed continuous integration service that compiles source code, runs tests, and ... 47 APIs 58.5 Smithery Smithery is an MCP server registry and hosting platform that lets developers discover, publish, and connect... 9 APIs 58.3 Couchbase Couchbase is a distributed, document-oriented NoSQL cloud database platform that combines the flexibility o... 54 APIs 56.9 Packagist Packagist is the default package repository for Composer, the PHP dependency manager. It indexes over 454,0... 5 APIs 56.5
Developing 9 Usable, with meaningful gaps to close
Gemini Google's Gemini API provides access to state-of-the-art generative AI models for text generation, multimoda... 20 APIs 52.4 Bazel Bazel is a fast, scalable, multi-language and extensible build tool open-sourced by Google. It supports sof... 6 APIs 50.5 Grafana Grafana Labs builds the open and composable observability stack used by millions of engineers to visualize,... 20 APIs 50.0 CData CData Software is a leading provider of data access and connectivity solutions. Our standards-based connect... 11 APIs 47.7 buildpacks-io Cloud Native Buildpacks (CNB) is a CNCF Incubating project that transforms application source code into OCI... 8 APIs 45.8 planetscale PlanetScale is a serverless MySQL database platform powered by Vitess, providing horizontal scaling, branch... 20 APIs 45.5 NGINX NGINX is a high-performance open-source web server, reverse proxy, and API gateway widely used for load bal... 32 APIs 44.8 Amazon Athena Amazon Athena is an interactive query service that makes it easy to analyze data in Amazon S3 using standar... 8 APIs 44.0 Bifrost Bifrost is a high-performance open-source AI gateway that unifies access to 20+ AI providers through a sing... 4 APIs 43.4
Thin 6 Limited public surface area
Apache Curator Apache Curator is a Java/JVM client library for Apache ZooKeeper, governed by the Apache Software Foundatio... 1 API 41.0 Amazon AppSync Amazon AppSync creates serverless GraphQL and Pub/Sub APIs that simplify application development through a ... 9 APIs 39.5 Turborepo Turborepo is a high-performance build system for JavaScript and TypeScript codebases, built by Vercel and w... 2 APIs 36.3 AI Gateway An API Evangelist landscape index of AI gateways — the LLM routers, prompt firewalls, model fallback proxie... 38 APIs 34.8 YARN YARN (Yet Another Resource Negotiator in the original Hadoop context; also the JavaScript package manager) ... 2 APIs 34.2 Kong AI Gateway Kong AI Gateway is the AI-native capability layer built on top of Kong Gateway and managed through Kong Kon... 21 APIs 32.5
Emerging 3 Early or largely undocumented
Varnish Cache Varnish Cache is a high-performance HTTP accelerator and reverse proxy designed for content-heavy dynamic w... 3 APIs 23.4 Promptfoo Promptfoo is an open-source CLI and TypeScript/Node.js library for evaluating, red-teaming, and security-te... 20.9 Nx Nx is a smart, fast, extensible monorepo build system and integrated CI platform created and maintained by ... 10 APIs 19.4

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

AI Accelerator semantic caching for OpenAI and Google GeminiAPI CachingAsynchronous container lookups with 202 polling and 12-hour cachingBoost for query result cachingBuild CachingBuilt-in caching (Memcached compatible)Built-in caching for improved performanceConditional requests with ETag/If-None-Match return 304 without consuming rate limitContent CachingContent-addressable local caching of task outputsContext CachingDeclarative Image builder with layered caching (pip_install, apt_install, run_commands, from_registry, from_dockerfile)Dependency caching for faster buildsDocker layer caching (Performance+)HTTP CachingLocal CachingLocal task caching with input-hash invalidation; worktree-aware in Nx 22.7Managed gateway handling MCP protocol compliance, metadata enrichment, and cachingMetadata CachingNode CachingOffline CachingPer-layer caching with launch/build/cache types in `.toml`Prompt caching with automatic and manual breakpoints, 5-minute and 1-hour TTLs, cache reads at 10% of input pricePrompt caching, prompt compression, and integrated web search inside the RouterQuery and resource caching (Enterprise)Query result caching for improved performance and cost reductionRemote Caching and ExecutionResponse CachingSemantic CachingStatic Composer v2 metadata mirror at repo.packagist.org with long-lived cachingStep caching for memoization`promptfoo eval` — run deterministic prompt/model evals with caching, concurrency, and live reload

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