Funding Rates X402
Perpetual Funding Rates API
Live perpetual funding rates across Binance, Bybit, OKX -- open interest and predicted next rate included. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"funding-rates": {
"url": "https://funding-rates.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl "https://funding-rates.api.klymax402.com/api/rates?symbol=BTC"
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
perp_get_funding_rates | GET | /api/rates | $0.002 | Get perpetual futures funding rates across exchanges |
perp_get_funding_rates
Use this when you need current perpetual futures funding rates for a single asset across exchanges. Returns rates comparison in JSON.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
symbol | string | yes | Token symbol (e.g. BTC, ETH, SOL) |
Returns
symbol-- trading pair symbolrates-- array per exchange with exchange name, current funding rate, annualized rateopenInterest-- open interest in USD per exchangepredictedNextRate-- predicted next funding rate per exchangenextFundingTime-- timestamp of next funding event
Example response:
{"symbol":"ETH","rates":[{"exchange":"Binance","rate":0.0082,"annualized":8.98},{"exchange":"Bybit","rate":0.0075,"annualized":8.21},{"exchange":"OKX","rate":0.0091,"annualized":9.97}],"openInterest":{"Binance":2150000000},"nextFundingTime":"2026-04-13T16:00:00Z"}
When to use: monitoring funding costs on your perpetual positions and timing entries. Essential for basis trading and funding cost management.
Not for: spot prices (use dex_get_swap_quote), yields (use defi_find_best_yields).
Example agent prompts
- "Current perpetual futures funding rates for a single asset across exchanges"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
Server Config
{
"mcpServers": {
"funding-rates": {
"url": "https://funding-rates-x402-production.up.railway.app/mcp",
"transport": "sse"
}
}
}