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Stop AI from guessing. Give it deterministic API context.

Turn your API spec into everything your consumers need: Context Plugins for AI coding agents, plus MCP servers, SDKs, and API Documentation Portals. Let everyone build on your deterministic API contract instead of guessing.

Teams shipping APIs for developers and agents run on APIMatic.

Maxio Akoya PayPal Verizon Fortis Juniper Networks Shell Boku PayQuicker PostNL Franklin Templeton

Two ways your API gets consumed. Both start with a guess.

92% of developers use an AI coding tool every day. AI agents call APIs with no human in the loop at all. Both build on your API by asking a language model what your contract looks like. And a language model does not know. It guesses.

A loop of trial and error

A coding agent doesn't fully know your API. It guesses the behavior your documentation leaves open, like how to page through results or which endpoints are safe to retry, so the code comes back with runtime errors.

The wrong tool at the wrong time

An AI agent consuming your API through an MCP server has to figure out which tool to call, and when. Without descriptions and usage scenarios that spell out what each tool is for, it reaches for the wrong one.

The model won't stop guessing on its own. Give it the correct API context, and the guessing stops.

See how APIMatic's Context Plugins ground AI coding agents in an API's deterministic context.

developer.paypal.com · Context Plugins
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developer.paypal.com · Context Plugins
Quickstart
Configure your AI coding tool
1
Choose the programming language your tool should target.
PresetTypeScriptTypeScript
.NET.NET
JavaJava
PHPPHP
PythonPython
RubyRuby
2
Connect your AI coding tool and we wire up the API context for you.
 
MCP install command
 
paypal-checkout
Explorer · src
 
 
 
PROBLEMS OUTPUT TERMINAL PORTS

What do you want to build?

Hover a line and click to select

 
main Context Plugin: PayPal Cursor Tab Ln 1, Col 1 Spaces: 2 UTF-8 TypeScript

Grounding beats guessing. We measured it.

91% fewer errors 65% fewer tokens ~2× faster integration

That's how much better coding agents perform when they have access to API Context. Read the case study →

Context makes code production-ready.

Those numbers come from one change: using a Context Plugin, the agent builds against your real API contract, not a guess at it. That's what separates code that runs from an integration that's "production-ready."

What production-ready looks like

spec-checked
  • Retry only idempotent calls
  • Map provider errors to clean statuses
  • Never leak internals in an error
  • Vet every dependency for known vulnerabilities
  • Keep credentials out of logs
  • Stay forward-compatible
  • Get currency units right

The AI layer is new. The deterministic engine underneath isn't.

Context Plugins and MCP servers are the newest outputs of an engine that's generated production SDKs and API Developer Portals for years. Same deterministic core, same OpenAPI spec, now grounding your agents too.

Learn more →
// Maxio's TypeScript SDK is available as a NPM package with
// support for Node.js and web environments.
import {
  Client,
  SubscriptionsController,
} from "@maxio-com/advanced-billing-sdk";
 
// Once configured, the SDK can be used to authenticated API calls.
const client = new Client({
  basicAuth: { username: "user", password: "pass" },
});
 
const subscriptions = new SubscriptionsController(client);
 
// SDK automatically handles serialization, API errors, validation,
// and type conversion (JSON to TypeScript interfaces)
const { result } = await subscriptions.listSubscriptions({
  page: 1,
  perPage: 20,
});
 
// Type-safe access to response data with full IntelliSense support
console.log(result[0].subscription?.state);
Learn more →
SDK and API documentation — API Developer Portal Interactive API playgrounds — API Developer Portal API Recipes — API Developer Portal SDK and API documentation — API Developer Portal Interactive API playgrounds — API Developer Portal API Copilot in docs — API Developer Portal SDK and API documentation — API Developer Portal Runnable code samples — API Developer Portal API Copilot in docs — API Developer Portal Pro tools for your team — API Developer Portal Pro tools for your team — API Developer Portal Interactive API playgrounds — API Developer Portal Interactive API playgrounds — API Developer Portal SDK and API documentation — API Developer Portal Interactive API playgrounds — API Developer Portal API Copilot in docs — API Developer Portal Runnable code samples — API Developer Portal Runnable code samples — API Developer Portal API Recipes — API Developer Portal Pro tools for your team — API Developer Portal SDK and API documentation — API Developer Portal Interactive API playgrounds — API Developer Portal API Recipes — API Developer Portal SDK and API documentation — API Developer Portal Interactive API playgrounds — API Developer Portal

Built for enterprises that want to move fast on AI

Maintain the security and reliability your API demands, without slowing down.

Self-hosting in your own infrastructure Run the whole pipeline inside your own network, so your spec never crosses a boundary you don't control.
One validation standard, enforced org-wide Validation tooling checks every spec against your correctness and style rules, so no team ships context off a spec that doesn't pass.
Concierge onboarding You get hands-on help from spec to shipped outputs, so your first rollout doesn't stall on setup.
Priority support with SLAs You get direct access to our team on committed response times, not a general queue.
Roadmap prioritization Your needs shape what we build next, with a direct line into the roadmap.

Hear it from the teams already running on APIMatic.

"PayPal’s new Server Side SDKs not only make it simple for developers to integrate with our APIs, they also power our Web SDK, and prepare our platform for the future of Agentic AI."
Nathaniel Olson Nathaniel OlsonSenior Technical Product Manager
"Verizon’s Developer Portal is a strategic catalyst for our 5G Edge vision—empowering developers with the tools, SDKs, and API recipes they need to accelerate innovation. By streamlining access to low-latency capabilities, it plays a pivotal role in unlocking the full business potential of 5G Network APIs."
Alicia Miller Alicia MillerNetwork API Product Manager
"Thanks to APIMatic, Maxio’s APIs sell themselves. A CTO, guided by our Sales team, saw how effortlessly our sandbox, SDKs, and recipes streamline integration."
Nestor Salinas Nestor SalinasSenior Product Manager

Build with APIMatic in your AI assistant

Add the APIMatic skill to Claude Code, Cursor, or Copilot, then prompt it with your OpenAPI spec. Context Plugins, SDKs, and a hosted API Developer Portal come back, no engineering required. When your spec changes, APIMatic regenerates each output, so what agents read stays current.

$ npx skills add apimatic/skills View the skills on GitHub

Questions teams ask before they choose APIMatic

On its own, an assistant guesses the parts your docs and OpenAPI spec don't spell out explicitly, like which endpoints are safe to retry. So the agent has to do 2 jobs, first it has to guess API behaviour, and second, it has to translate that inferred behaviour into a language-specific implementation. In doing so, an agent tends to make mistakes or write code that is far from production-ready. Context Plugins can feed an agent deterministic, spec-derived context covering details that are not part of an API Spec, so it stops guessing and writes code that runs against your real API.

APIMatic is a complete developer and agent experience platform; OpenAPI Generator is a code generation tool. From one OpenAPI spec, APIMatic generates SDKs, code samples, an API developer portal, Context Plugins, and MCP servers, so your API is ready for both developers and AI agents. OpenAPI Generator stops at SDKs. And on SDKs themselves, APIMatic is the stronger choice: OpenAPI Generator's per-language generators are community-maintained, so quality varies from one language to the next, while APIMatic generates every language from the same engine, giving you consistent, idiomatic SDKs across your entire language set.

APIMatic works with Cursor, Claude Code, and GitHub Copilot, plus agents that consume MCP servers. Its Context Plugins ground them in your real API context.

Point APIMatic at your OpenAPI spec and add the generated Context Plugin to your AI coding tool. The assistant then writes integrations from your API's real contract, not from stale public training data.

APIMatic provides an OpenAPI-to-MCP server generator: point it at your OpenAPI specs and it produces an MCP server. When your spec changes, the MCP server regenerates automatically. APIMatic also provides a validation ruleset that evaluates if your API spec is ready for AI tool generation.

One source of truth your developers and their AI agents can both trust

One spec in. A portal, SDKs, docs, code samples, Context Plugins, and MCP servers out, all in sync, all regenerated on every change.

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