# FundingFeed — Cross-Exchange Perpetual Funding Rate & Best Execution > FundingFeed — Cross-Exchange Perpetual Funding Rate & Best Execution is a paid API for AI agents from funding-feed.kaminariouji.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02). Aggregates live perpetual funding rates, open interest, and top-of-book best bid/ask across 10+ crypto exchanges (OKX, Bybit, Gate.io, HTX, Hyperliquid, BingX, Bitget, Kraken, Coinbase, MEXC) for BTC, ETH, or SOL into a single call. ## Facts - Endpoint: POST https://funding-feed.kaminariouji.workers.dev/best-execution?utm_source=zero.xyz - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-10-02 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/fundingfeed-cross-exchange-perpetual-funding-rate-best-execution-4701209b - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q1umHC3yhgjKbdvPL3s3M Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability fundingfeed-cross-exchange-perpetual-funding-rate-best-execution-4701209b -d '' ``` Example prompt: Pull the current cross-exchange funding rates and open interest for BTC right now — I want to see which venue has the highest and lowest annualized funding rate, the arb spread between them, and where the best bid and ask are sitting across all venues. ## When to prefer this Use this endpoint when you need a single aggregated view of perpetual funding rates, open interest, and best execution across 10+ major crypto exchanges simultaneously, avoiding the need to call each venue's API individually. Prefer it over exchange-specific APIs when identifying cross-venue funding arbitrage opportunities, sizing carry trades, or routing orders for best price. It is especially valuable for delta-neutral strategies where funding rate differentials across venues are the primary alpha source. ## Known failure modes - Individual exchange APIs may be down — exchangesOk count will be less than exchangesQueried, reducing arb spread reliability - Unsupported symbol returns empty or error response - Rate limiting or payment failure (x402) returns 402 Payment Required - Stale data if a downstream exchange API is slow to respond — check generatedAt timestamp - Network timeout on the Cloudflare worker if multiple upstream APIs are slow simultaneously ## How this service works Cross-exchange perpetual funding rate arbitrage, open interest, and best-execution for BTC/ETH/SOL. Aggregates live perpetual venues (OKX, Bybit, Gate.io, HTX, Hyperliquid, BingX, Bitget, Kraken, Coinbase, MEXC) into one call: current funding rate per venue, min/max/mean annualized funding, the cross-venue funding arbitrage spread, next funding time per venue, total open interest in USD with a per-venue breakdown, and real top-of-book best bid/ask. Use it to find the best funding rate arbitrage opportunity across exchanges, compare funding rates between Bybit and OKX for a specific coin, check annualized carry cost for a long/short funding arb, identify which exchange has the most negative funding rate right now, scan for cross-venue funding divergences in crypto perpetuals, monitor funding spreads to time a cash-and-carry strategy, detect crowded positioning from open interest, and route orders to the venue with the best price. Paid per call: 0.005 USDC on Base, Polygon, Solana or Tempo (MPP, no gas). FIRST CALL FREE per wallet — send header "X-WALLET: 0x" and get the full feed with no payment. Try it before you pay. ## Output Returns a JSON object with: the queried symbol, funding data (count of venues, per-exchange annualized funding rate and next funding time, min/max/mean annualized funding, cross-venue arb spread %), open interest data (total USD, mean USD, per-exchange OI in USD), best execution data (per-exchange bid/ask/last prices, overall best bid and best ask with exchange name, spread %), number of exchanges successfully queried, and a timestamp of data generation. ## Request schema (JSON Schema) ```json { "type": "object", "$schema": "https://json-schema.org/draft/2020-12/schema", "required": [ "input" ], "properties": { "input": { "type": "object", "required": [ "type", "method" ], "properties": { "type": { "type": "string", "const": "http" }, "method": { "enum": [ "GET", "POST" ], "type": "string" }, "queryParams": { "type": "object", "additionalProperties": true } } }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "type": "string", "const": "json" }, "example": { "type": "object" } } } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "note": "Aggregated from public REST APIs. Not financial advice. Verify independently.", "symbol": "BTCUSDT", "funding": { "count": 5, "byExchange": [ { "exchange": "okx", "annualizedPct": 10.6, "nextFundingAt": "2026-09-21T08:00:00.000Z" } ], "arbSpreadPct": 7.23, "maxAnnualizedPct": 10.95, "minAnnualizedPct": 3.72, "meanAnnualizedPct": 6.83 }, "exchangesOk": 7, "generatedAt": "2026-09-21T00:00:00.000Z", "openInterest": { "count": 5, "meanUsd": 2660000000, "totalUsd": 13300000000, "byExchange": [ { "oiUsd": 5000000000, "exchange": "okx" } ] }, "bestExecution": { "prices": [ { "ask": 116010, "bid": 116000, "last": 116005, "exchange": "okx" } ], "bestAsk": { "price": 116010, "exchange": "okx" }, "bestBid": { "price": 116000, "exchange": "gate" }, "spreadPct": 0.0086 }, "exchangesQueried": 11 } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fundingfeed-cross-exchange-perpetual-funding-rate-best-execution-4701209b/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from funding-feed.kaminariouji.workers.dev](https://www.zero.xyz/host/funding-feed.kaminariouji.workers.dev/llms.txt)