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FreeTier Agent API — Free Tier Lookup
x402
FreeTier Agent API — Free Tier Lookup is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-18).
Search and retrieve free tier details for APIs, AI models, and developer tools by category or keyword
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call data API for AI agents: AI model prices and cost calculator, 4,259 MCP servers, email domain checks, text-to-JSON extraction, country/holiday/currency lookup, page and link checks, page-to-markdown, 2,230 verified APIs. x402, USDC on Base, no signup. Sources cited in every response.
Output
Returns a JSON object with a count of results and an array of matching APIs, each with a name, category, URL to documentation, and a description of their free tier details (e.g. rate limits, request quotas, feature restrictions).
Example use cases
Discover free LLM APIs for a project
“I'm building a side project and need a free AI/LLM API — can you search for AI model APIs that have a free tier and tell me what limits each one offers?”
Find free email validation tools
“What APIs in the email or validation category have free tiers? Search for anything related to 'email' and show me the details.”
Budget tool comparison for a startup
“We're bootstrapping and need to cut costs — can you look up all the free-tier developer APIs available in the 'data' or 'utility' category so we can see what we can use without paying?”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/free-tiers?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to discover or verify free tier availability, limits, or rate limits for developer APIs — especially AI/LLM APIs — without requiring any signup. Prefer this over general web search when you need structured, cited data about free tiers across thousands of APIs in a single call.
Side effects
- No results returned if query or category does not match any indexed APIs
- Empty results array if search term is too specific or misspelled
- API may return an error if required 'input' object is malformed or missing
- Stale data if the underlying free-tier database has not been recently updated for a given service
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 1,
"results": [
{
"url": "https://console.groq.com/docs/rate-limits",
"name": "Groq - Llama models",
"category": "AI / LLM API",
"free_tier_details": "Free tier with per-model rate limits"
}
]
}
}Tags
x402
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