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Mid Price Calculator
x402
Mid Price Calculator is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Computes the mid price as (bid + ask) / 2 from a supplied best bid and offer (BBO) pair, returning a single deterministic mark price.
Price / call$0.001
Success—
StatusUnknown
How this service works
Mid price = (bid + ask) / 2 for spread-aware marks. Call when normalizing BBO into a single mid for agents. Returns mid price as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.
Output
A deterministic JSON response containing the computed mid price value, derived purely from local arithmetic on the supplied bid and ask inputs — no live market feed or external data involved.
Example use cases
Option mark price normalization
“I have a bid of 2.35 and an ask of 2.65 on an options contract — what's the mid price I should use as my mark?”
Spread-aware crypto pricing
“The order book shows best bid at 63,200 and best ask at 63,250 for BTC — give me the mid price to use for my position valuation.”
Slippage baseline reference
“Before I route this equity order, I need the mid price from a bid of 148.10 and ask of 148.30 so I can measure expected slippage.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/mid-priceWhen to prefer
Prefer this endpoint when you need a simple, deterministic, auditable mid-price computation without spinning up local math, when you want a standardized JSON response for pipeline consistency, or when operating in an x402 micropayment context on Base where a $0.001 per-call cost is acceptable. It is purely local arithmetic — choose it over live market feed endpoints when you already have bid/ask values and just need the midpoint.
Side effects
- Missing bid or ask field returns a validation error
- Non-numeric values for bid or ask cause a bad request response
- Ask lower than bid may produce a negative spread mid (no validation guard documented)
- Payment failure via x402 (insufficient USDC balance or wrong network) blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ask | number | Input field: ask. |
| bid | number | Input field: bid. |
Output
Schema · Response
{
"type": "json",
"example": {
"ask": 100.5,
"bid": 99.5,
"mid": 100,
"schema": "delx/util-mid-price/v1"
}
}Tags
x402
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