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Oblique Markets Ghost Bid Audit
x402
Oblique Markets Ghost Bid Audit is a paid API for AI agents from api.oblique.markets, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Audits a selected agent offer against rejected cheaper alternatives, computing counterfactual savings, regret scores, and producing a tamper-evident receipt.
Price / call$0.01
Success—
StatusUnknown
How this service works
Use when an agent needs ghost bid audit. Returns Audit a selected agent offer against rejected affordable alternatives with counterfactual savings, regret, and a tamper-evident receipt. $0.01.
Output
Returns a structured audit report including: counterfactual savings (how much cheaper the best rejected alternative was), a regret score quantifying the suboptimality of the selection, a comparison of the selected offer versus all provided alternatives, and a tamper-evident cryptographic receipt tied to the signature secret, confirming the declared offer and audit inputs.
Example use cases
Post-purchase overpayment check
“My agent just bought an API call package for 8000 atomic units but I saw there were alternatives at 5500 and 6200 — can you audit that decision, show me how much I could have saved, and give me a signed receipt proving what alternatives were available?”
Tamper-evident agent decision log
“I need a cryptographically verifiable receipt showing that my agent evaluated three competing offers before selecting the one at 4500 atomic units, with the rejected alternatives listed and a regret score, so I can prove the decision process was legitimate.”
Marketplace fairness audit
“Audit whether the offer my agent selected in the bazaar at 7000 atomic units was reasonable — compare it against the five rejected alternatives I'm passing in, tell me the counterfactual savings, and sign the result with my secret key.”
Technical details
Endpoint
POSThttps://api.oblique.markets/api/v1/paid/ghost-bid-auditWhen to prefer
Choose this endpoint when an AI agent needs to produce a verifiable, tamper-evident audit trail of a marketplace offer selection — particularly when accountability, counterfactual analysis, or proof of due diligence is required. It is the right choice when you need to quantify regret or savings relative to rejected bids, or when a downstream party needs a signed receipt proving alternatives were considered. Prefer this over simple price comparison when cryptographic integrity of the audit record matters.
Side effects
- Missing or malformed selected_offer object returns 400 validation error
- Empty alternatives array yields trivial audit with zero counterfactual savings
- Signature secret mismatch or absence prevents tamper-evident receipt generation
- max_price_atomic out of range or negative returns input validation failure
- selected_offer_declared flag inconsistency with signed_selected_offer causes rejection
- Payment not attached (x402 protocol) results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| alternatives | array | |
| selected_offer | object | |
| max_price_atomic | integer | |
| signature_secret | string | |
| signed_selected_offer | object | |
| selected_offer_declared | boolean |
Output
Schema · Response
{
"type": "json",
"example": {
"generated_at": "2026-08-24T12:00:00.000Z",
"regret_score": 0.25,
"audit_receipt": "sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
"audit_version": "ghost-bid-audit.v1",
"budget_atomic": 12000,
"savings_atomic": 3000,
"selected_offer": {
"id": "offer-selected",
"provider": "seller-a",
"price_atomic": 12000
},
"price_delta_atomic": 3000,
"alternatives_considered": 2,
"selected_offer_verification": "explicit",
"best_rejected_affordable_option": {
"id": "offer-rejected",
"provider": "seller-b",
"price_atomic": 9000
}
}
}Tags
x402
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