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Arcus Perpetual Market Facts API
x402
Arcus Perpetual Market Facts API is a paid API for AI agents from api.octodamus.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Returns live perpetual market data from Arcus (dYdX Labs on Robinhood Chain) including funding rates, open interest, mark/oracle prices, 24h volume, and off-hours margin fractions for tokenized-stock, index, and crypto perps
Price / call$0.02
Success—
StatusUnknown
How this service works
Live perp market facts from Arcus (dYdX Labs on Robinhood Chain) for tokenized-stock, index, and crypto perps: hourly funding (+ annualized), open interest (base + USD), mark vs oracle price, 24h volume, and margin fractions including the off-hours initial margin (Arcus raises margin when the NYSE is closed). Perp-venue complement to stock-perp-facts.
Output
Returns a JSON object with live Arcus perpetual market data including: hourly funding rate and its annualized equivalent, open interest in base asset and USD terms, current mark price and oracle price, 24-hour trading volume, standard margin fraction, and the elevated off-hours initial margin fraction that Arcus applies when the NYSE is closed — all for tokenized-stock, index, and crypto perps on Robinhood Chain.
Example use cases
Monitor funding rate arbitrage across venues
“Check the current funding rates on Arcus perps for me and compare them to what we're seeing elsewhere — I need to know if there's a profitable arbitrage opportunity between the mark price and oracle price spreads right now.”
Track tokenized stock perp liquidity
“Give me the live open interest and 24-hour volume numbers for the tokenized-stock perps on Arcus — I want to see both the base asset and USD amounts so I can understand how much liquidity we're working with.”
Assess margin requirements during market hours
“Pull the current margin fractions for our Arcus crypto positions, and make sure you grab the off-hours initial margin too since the NYSE will be closing soon — I need to know what our requirements will shift to overnight.”
Technical details
Endpoint
GEThttps://api.octodamus.com/v2/arcus/perpWhen to prefer
Use this endpoint when you need live perpetual market data specifically from the Arcus venue (dYdX Labs on Robinhood Chain), particularly for tokenized-stock or index perps that are unique to that venue, or when you need the off-hours initial margin fraction that reflects NYSE session status. Prefer this over generic crypto derivatives endpoints when Arcus-specific venue data (mark vs oracle spread, Arcus funding) is needed for trading decisions or venue comparison.
Side effects
- Missing or invalid PAYMENT-SIGNATURE header returns 402 Payment Required
- Expired or already-used EIP-3009 payment signature returns 402
- Insufficient USDC balance on Base mainnet causes payment failure
- Network congestion on Base mainnet may delay payment validation
- Arcus venue data outage may return stale or empty market data
- Malformed request without required GET method returns 400
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Tags
x402
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