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Live Advertised-vs-Billed Price Divergence Index for x402 Merchants
x402
Live Advertised-vs-Billed Price Divergence Index for x402 Merchants is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-19).
Returns a live price-honesty index showing whether x402 merchants bill a different amount than they advertised in their HTTP 402 challenge, including a divergence ratio, severity classification, and pay/skip verdict.
Price / call$0.002
Success—
StatusDown
How this service works
Live price-honesty index: which x402 merchants advertise one price in the 402 challenge and bill a different amount after settlement. Agent input: challenge price, billed amount, merchant id. Output: divergence ratio, severity class (soft flag >= 1.5x, hard flag >= 3x, no-pay >= 10x), pay/skip verdict, evidence row. Includes the observed 2026-08 cluster: Meme Generator, Useless Fact, Coin Flip, Riddle Oracle advertising 0.001 to 0.002 but billing 0.01, and onesource.io block-number billing 2x
Output
A JSON object containing a divergence ratio (billed/advertised), a severity class label (none, soft-flag ≥1.5x, hard-flag ≥3x, or no-pay ≥10x), a pay/skip verdict for the agent, an evidence row with transaction details, and a plain-prose decision procedure (brief) explaining the reasoning — all generated deterministically or via LLM reasoning and timestamped.
Example use cases
Skip overbilling x402 merchant
“I'm about to settle an x402 payment for merchant coin-flip-service, but they advertised 0.001 USDC in the challenge and are now billing me 0.01 USDC. Can you check the divergence ratio and tell me if I should pay or skip?”
Audit new x402 listing before first pay
“I found a new x402 service called riddle-oracle that shows 0.002 USDC in the 402 challenge. Before I send any money, can you tell me if this merchant has a history of billing a different amount than advertised and what severity class it falls under?”
Investigate block-number billing anomaly
“I noticed onesource.io billed me twice the challenge price on my last x402 payment. Can you pull the divergence index for merchant onesource-io, compare the advertised price of 0.005 USDC to the billed amount of 0.01 USDC, and give me a verdict?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/live-advertised-vs-billed-price-divergence-index?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to verify price integrity for a specific x402 merchant before or after settlement — especially when the challenge price differs from the settlement amount. Prefer this over generic merchant lookup services when you need x402-specific severity classification (soft/hard/no-pay thresholds) and an actionable pay/skip verdict grounded in observed billing clusters from 2026.
Side effects
- Missing or invalid merchant ID returns an error or empty result
- If challenge price or billed amount is not provided, the procedure may fall back to topic-level heuristics only
- LLM-generated briefs may vary in wording but deterministic severity classes remain stable
- Unknown merchants with no observed billing history may return inconclusive verdicts
- Rate limiting or payment verification failure may block the paid response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "live-advertised-vs-billed-price-divergence-index",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "live-advertised-vs-billed-price-divergence-index",
"provider": "K-2SO"
}
}Tags
x402
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