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fastapi.online — Crypto Orderbook Lookup
x402
fastapi.online — Crypto Orderbook Lookup is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Returns the current order book (bids and asks) for a given trading symbol, with optional depth limit
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 a snapshot of the current order book for the requested trading symbol, including arrays of bids and asks at various price levels with their corresponding quantities, up to the specified depth limit.
Example use cases
Check crypto market depth before trading
“Pull up the order book for ETH/USDT with a depth of 50 — I want to see how much liquidity is sitting on each side before I place a large order.”
Monitor best bid and ask spread
“Get me the top 5 bids and asks for SOL/USDC so I can see the current spread and decide if it's a good time to buy.”
Analyze orderbook for arbitrage signals
“Fetch the full order book for BTC/USDC with a limit of 100 entries and show me where the big walls are on either side.”
Technical details
Endpoint
POSThttps://api.fastapi.online/orderbook?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-call order book snapshot for a crypto trading pair without signing up for a full exchange API. Ideal for agents that occasionally need market depth data and want to pay in USDC with no subscription commitment.
Side effects
- Invalid or unrecognized symbol returns an error or empty result
- Limit parameter out of accepted range may cause a validation error
- Service unavailability or timeout returns a 5xx error
- Missing required symbol field may result in a 422 Unprocessable Entity
- Payment failure via x402 protocol returns a 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | string | |
| symbol | string |
Tags
x402
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