# FundingFeed — Cross-Exchange Perpetual Funding Rate & Open Interest Aggregator > FundingFeed — Cross-Exchange Perpetual Funding Rate & Open Interest Aggregator 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 2026-09-29). Aggregates live perpetual funding rates, open interest, and best bid/ask across 10 major crypto exchanges (OKX, Bybit, Gate.io, HTX, Hyperliquid, BingX, Bitget, Kraken, Coinbase, MEXC) for BTC, ETH, and SOL in a single call ## Facts - Endpoint: POST https://funding-feed.kaminariouji.workers.dev/tempo?utm_source=zero.xyz - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-09-29 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/fundingfeed-cross-exchange-perpetual-funding-rate-open-interest-af86e743 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vmahxUKwx_ds6mjiaElB0 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-open-interest-af86e743 -d '' ``` Example prompt: Pull the latest cross-exchange funding rates for BTC right now — I want to see which venue has the highest and lowest annualized funding, the arbitrage spread, total open interest, and the best bid/ask so I can figure out where to leg into a cash-and-carry. ## When to prefer this Choose FundingFeed when you need a single API call that aggregates perpetual funding rates across 10+ major exchanges simultaneously — avoiding the need to query each exchange individually. Ideal for funding arbitrage strategies, cash-and-carry sizing, crowded positioning detection, and best-execution routing. Prefer this over exchange-native APIs when cross-venue comparison is the goal. The /tempo endpoint additionally returns Tempo chain wallet activity, useful for verifying on-chain payment flow alongside funding data. ## Known failure modes - Upstream exchange API outage causes missing data for one or more venues - Rate limit or payment failure returns 402 with x402 payment required - Stale data if a venue's feed lags — check generatedAt timestamp - Unsupported coin symbol returns empty or error response - Network timeout from Cloudflare Worker if multiple upstream calls are slow ## 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: per-venue current funding rates, min/max/mean annualized funding, cross-venue funding arbitrage spread, next funding timestamp per venue, total open interest in USD with per-venue breakdown, real-time best bid/ask across venues, and (for the /tempo endpoint) Tempo chain wallet activity including 7-day transfer volume, inbound/outbound counts, distinct counterparties, balances, and an activity score heuristic. ## 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": "Read live from Tempo's transfer index and balances API. Activity score is a transparent heuristic, not financial advice.", "chain": "eip155:4217", "address": "0xdb5aa553feeb2c3e3d03e8360b36fb0f7e480671", "activity": { "byToken": { "USDC.e": 107 }, "inbound7d": 107, "outbound7d": 0, "transfers7d": 107, "volumeUsd7d": { "in": 1.992, "out": 0, "total": 1.992 }, "lastTransfer": "2026-09-23T15:39:07.000Z", "transfers24h": 9, "firstTransfer7d": "2026-09-16T21:06:30.000Z", "distinctCounterparties7d": 43 }, "balances": [ { "name": "Bridged USDC (Stargate)", "amount": "153.575", "symbol": "USDC.e", "address": "0x20c000000000000000000000b9537d11c60e8b50", "decimals": 6, "verified": true } ], "chainName": "Tempo", "generatedAt": "2026-09-23T00:00:00.000Z", "activityScore": 84 } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fundingfeed-cross-exchange-perpetual-funding-rate-open-interest-af86e743/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)