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finmath Function Selector
x402
finmath Function Selector is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Routes financial and crypto math function calls (TradFi and DeFi) to the correct deterministic computation engine via a function signature
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 result object containing the computed financial value (e.g. option price, NPV, liquidation price, impermanent loss percentage) and a meta object with call metadata such as function name, input echo, and execution info.
Example use cases
Calculate impermanent loss for LP position
“I just added $10,000 in equal parts ETH and USDC to a Uniswap v3 pool at tick range 192,000 to 194,000. ETH was $2,500 when I entered. Now it's $3,000. Can you compute my impermanent loss using finmath so I know if I'm ahead after fees?”
Determine liquidation price for leveraged trade
“I'm opening a 5x leveraged long on BTC perpetuals at $45,000 with $2,000 collateral. What's my liquidation price if the exchange uses a 10% maintenance margin requirement? Run the finmath liquidation calculation so I understand my risk.”
Evaluate investment project returns accurately
“I have cash flows for a solar farm project: -$500k upfront, then +$80k annually for years 1-10, and +$100k in year 11 from equipment sale. Calculate the XIRR for this irregular schedule using finmath — I need the exact IRR, not an LLM guess.”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/function_selectorWhen to prefer
Choose this endpoint when you need exact, deterministic financial arithmetic that LLMs are known to hallucinate or approximate incorrectly — such as Black-Scholes Greeks, IRR/XIRR, bond pricing, impermanent loss, DeFi liquidation thresholds, or Uniswap v3 math. Prefer it over asking an LLM to compute finance formulas directly, as this guarantees model-free precision.
Side effects
- Invalid or malformed function signature string returns an error
- Unsupported function name in signature causes routing failure
- Missing required parameters within the signature string cause computation errors
- Division by zero or mathematically undefined inputs (e.g. negative volatility) return error
- Payment not received or insufficient USDC causes 402 rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| signaturerequired | string | signature |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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