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Delx Commerce — Binary EV (No) Calculator
x402
Delx Commerce — Binary EV (No) Calculator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Calculates the expected value (EV) of buying 'No' shares in a binary prediction market given stake, true probability, and market price.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object containing the computed expected value (ev, which can be negative indicating a losing bet), the original stake, the number of No shares received, the No price used, and a schema identifier string (delx/util-binary-ev-no/v1).
Example use cases
Evaluating a No bet edge
“I'm looking at a binary prediction market where the current No price is 0.52 and I think the real probability of Yes is 35%. If I stake 200, what's my expected value on the No side?”
Checking if a No trade is profitable
“Is it worth buying No on this market? Market No price is 0.48, I believe the true probability of the event happening is 60%, and I want to stake 50.”
Comparing EV before placing a wager
“Before I commit to this No position, can you calculate the expected value? My stake is 500, I think there's a 30% chance Yes resolves true, and the current No price in the market is 0.55.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/binary-ev-no?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap, deterministic calculation of expected value specifically for the 'No' side of a binary prediction market. Prefer it over building your own EV formula when you want verifiable, pay-per-use computation with no API key or signup required, and you are operating on Base or Solana with USDC via x402 micropayments.
Side effects
- Missing required fields (stake, true_prob, or market_price) returns a validation error
- true_prob outside [0,1] range may cause calculation errors or invalid results
- market_price outside valid range (0,1) may yield nonsensical share calculations
- Network or payment failure (402 not settled) results in no response
- Integer stake of 0 may produce division errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| stake | integer | Input field: stake. |
| true_prob | number | Input field: true prob. |
| market_price | number | Input field: market price. |
Output
Schema · Response
{
"type": "json",
"example": {
"ev": -13.46153846153848,
"stake": 100,
"schema": "delx/util-binary-ev-no/v1",
"shares": 192.3076923076923,
"no_price": 0.52
}
}Tags
x402
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