90% context waste is costing you money

You pasted a 2.7MB spec.
Now your agent can't think.

90% context used. Response quality degraded. Tokens burned. openapi.city returns 2KB of exactly what your agent needs — one endpoint, one schema, one summary.

Tell your agent:

Sign up for openapi.city. Read https://openapi.city/signup.md for instructions.

— Or sign up yourself the old-school way —

The Math

Context window economics

Without openapi.city
90%
context window used
  • Full 2.7MB Stripe spec
  • ~700,000 tokens
  • $2.10 per paste (at $3/M tokens)
  • Degraded reasoning quality
With openapi.city
3%
context window used
  • Single endpoint: ~2KB
  • ~500 tokens
  • $0.0015 per query
  • Clear reasoning, correct output
30× less context usage | 1,400× cheaper per call
Why It Gets Worse

More context = worse reasoning

📊

LLM quality degrades with context saturation

Research shows that as context windows fill, LLM attention mechanisms struggle to maintain coherence. Key details get lost in the noise. The agent isn't dumber — it's drowning in irrelevant schema definitions, examples, and documentation it doesn't need.

💰

Real money, real fast

At $3 per million input tokens, pasting a 700K-token spec costs $2.10 every single time. Do that 10 times in a coding session = $21. openapi.city queries cost fractions of a cent. The math is not close.

🔄

Multi-step tasks become impossible

Your agent needs context for reasoning, tool calls, and response generation. When 90% is consumed by a spec, there's no room for the actual work. Complex integrations requiring multiple API calls? Forget it.

Demo

See the context difference

Same task. Different approach. 30x less context.

Without openapi.city CTX 0%
With openapi.city CTX 0%
How It Works

Lean responses by design

1

Query one endpoint

Your agent asks for POST /charges from Stripe. Gets back parameters, request body, and response structure. ~2KB. Exactly what's needed. Nothing more.

2

Resolve schemas on demand

Need the full PaymentIntent schema? Call get_schema. Get it resolved. Don't pay the token cost for schemas you'll never use.

3

Compact summaries for discovery

Not sure which endpoint you need? Get an AI-optimized summary: auth setup, base URL, and top 10 most relevant operations. Enough to decide without the bloat.

Code Example

The 2KB response

One REST call. One endpoint. Minimal context.

REST API GET · 2.1KB response
# Request
GET /api/v1/providers/stripe/endpoints/POST/charges
Authorization: Bearer oac_live_...

# Response (truncated)
{
  "method": "POST",
  "path": "/charges",
  "parameters": [...],
  "request_body": { ... },
  "responses": { ... }
}

Exactly what your agent needs. 2KB. Not 2.7MB.
Pricing
Start free, scale when ready

No credit card required. Upgrade when your agents need more.

Free
€0/mo

Hobby projects & exploration

  • 100 calls / month
  • Full REST API access
  • Full MCP server access
  • 100+ indexed APIs
  • Community support
Get Started
POPULAR
Pro
€10/mo

excl. VAT

Production AI agents

  • 5,000 calls / month
  • Full REST API + MCP
  • 100+ indexed APIs
  • API comparison — side-by-side in 1 call
  • Custom providers — resolve any spec URL
  • €10 / 1,000 overage calls
  • Priority support
Get Started
3% context or 90%.
Your choice.

Start free. 100 calls. No credit card. Stop burning tokens on full spec dumps.