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fastapi.online — Open Interest Lookup
x402
fastapi.online — Open Interest Lookup is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).
Fetches open interest data for a given trading symbol from a self-hosted financial data endpoint
Price / call$0.001
Success—
StatusUnknown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns open interest data for the specified trading symbol, likely including the total open interest value and possibly related contract metrics such as notional value or change over time.
Example use cases
Crypto derivatives market analysis
“Can you pull the open interest for ETHUSDT so I can see how much speculative positioning is currently in that futures market?”
Trading signal research
“Look up the open interest for SOLUSDT — I'm trying to gauge whether the market is heavily positioned before the next price move.”
Portfolio risk monitoring
“What's the open interest right now for BTCUSDT? I want to track whether leveraged exposure is increasing or decreasing in Bitcoin futures.”
Technical details
Endpoint
POSThttps://api.fastapi.online/open-interest?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, no-signup way to retrieve open interest data for a cryptocurrency or derivatives trading symbol, especially in crypto-native agent workflows where USDC micropayments via x402 are preferred over traditional API key subscriptions.
Side effects
- Invalid or unsupported symbol returns an error or empty result
- Payment not received results in HTTP 402 response
- Server unavailable or self-hosted model offline returns 5xx error
- Missing required symbol field returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| symbol | string |
Tags
x402
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