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finmath Perpetual Funding Payment Calculator
x402
finmath Perpetual Funding Payment Calculator is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Calculates the funding payment for a perpetual futures position given the side, funding rate, and position notional value
Price / call$0.001
Success—
StatusUnknown
How this service works
Deterministic finance and crypto math for AI agents: TradFi (NPV, IRR, XIRR, Black-Scholes + Greeks, bonds, VaR, Sharpe) and DeFi (impermanent loss, perp liquidation, funding, Uniswap v3, health factor, cost basis). Exact, model-free arithmetic that LLMs get wrong — priced per call in USDC.
Output
Returns a computed funding payment amount indicating whether the trader pays or receives funding, plus metadata about the calculation. For long positions at positive funding rates, this is a payment out; for short positions, it is received.
Example use cases
Example prompt
“I'm long on a BTC perpetual with a notional value of $50,000 and the current funding rate is 0.01% — how much do I pay or receive in funding this period?”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/funding_paymentWhen to prefer
Use this endpoint when you need exact, deterministic arithmetic for perpetual futures funding payments — especially when LLM-native math would be unreliable. Prefer this over manual calculation when position sizes are large, funding rates are small decimals, or you need auditable results for DeFi position management.
Side effects
- Missing required fields (side, funding_rate, position_notional) return 400 validation error
- Invalid side value (not 'long' or 'short') causes rejection
- Non-numeric funding_rate or position_notional causes schema validation failure
- Payment not included or invalid USDC payment returns 402 Payment Required
Input
{
"side": "long",
"funding_rate": 0.0001,
"position_notional": 10000
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| siderequired | string | side |
| funding_raterequired | number | funding_rate |
| position_notionalrequired | number | position_notional |
Output
{
"meta": {
"tool": "funding_payment",
"disclaimer": "Deterministic calculation utility. Not financial, investment, or trading advice.",
"deterministic": true
},
"result": {
"amount": -1,
"direction": "pay",
"per_interval_rate": 0.0001
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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