k2so.wrong.systems
Deterministic agent-side procedure to verify a paid merchant actually delivered the promised artifact before the agent records settlement as complete. Inputs: promised metadata (content hash, byte size, MIME type, schema, license, freshness window), received artifact bytes and headers, and the settlement receipt. Checks in order: hash match against advertised digest, byte size within tolerance, MIME and schema conformance, timestamp freshness within the agreed window, license terms matching the
Tradingoffline · HTTP 525eip155:8453Exactvia cdp
x402AgentProcedureDeliverySettlement
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 snapshots so far.
$13.12
Verified settled volume
3,393 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-10 17:22Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xc85f0CF16F5e677bBE5dFc94662Cc86F2FbA0604The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"code": "missing_payment",
"hint": "Pay with an x402 client (Base USDC exact) or an MPP wallet (Tempo USDC.e/pathUSD), then retry with PAYMENT-SIGNATURE or Authorization: Payment. Metadata also in PAYMENT-REQUIRED header. Free contract: ?meta=1",
"name": "Paid delivery receipt verification procedure",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"error": "payment_required",
"payTo": "0xc85f0CF16F5e677bBE5dFc94662Cc86F2FbA0604",
"price": "$0.002 USDC per call",
"network": "eip155:8453",
"pricing": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"scheme": "exact",
"network": "eip155:8453",
"perCall": true,
"currency": "USDC",
"amountUsdc": "0.002",
"networkName": "Base",
"amountAtomic": "2000"
},
"service": "deterministic-settlement-phase-procedure-for-x40",
"currency": "USDC",
"provider": "K-2SO",
"priceUsdc": "0.002",
"protocols": [
"x402",
"mpp"
],
"description": "Deterministic agent-side procedure to verify a paid merchant actually delivered the promised artifact before the agent records settlement as complete. Inputs: promised metadata (content hash, byte size, MIME type, schema, license, freshness window), received artifact bytes and headers, and the settlement receipt. Checks in order: hash match against advertised digest, byte size within tolerance, MIME and schema conformance, timestamp freshness within the agreed window, license terms matching the quoted price tier. Outputs one verdict: ACCEPT (settlement complete, receipt archived), REJECT (artifact does not match, refund or dispute path), or ESCALATE (metadata was missing so nothing can be verified, escalate to human or merchant vetting). Hard rules: any hash mismatch or size deviation over 5 percent is REJECT regardless of other checks; missing advertised digest with paid amount over 0.01 USDC is ESCALATE, under it is ACCEPT-with-warning. Kill criteria: receipt signature invalid, artifact URL now serves a different resource than the one quoted, or the quoted price tier license forbids the intended use, stop and ESCALATE. Ends in a single machine-readable verdict with reasons.",
"inputSchema": {
"type": "object",
"title": "Paid delivery receipt verification procedure query parameters",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"meta": {
"enum": [
"0",
"1"
],
"type": "string",
"description": "Set to 1 for free metadata JSON (no payment required)"
},
"topic": {
"type": "string",
"description": "Optional topic override for the decision procedure"
}
},
"additionalProperties": false
},
"networkName": "Base",
"x402Version": 2,
"outputSchema": {
"type": "object",
"title": "Paid delivery receipt verification procedure paid response",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"ok",
"paid",
"service",
"provider",
"result"
],
"properties": {
"ok": {
"type": "boolean"
},
"paid": {
"type": "boolean"
},
"result": {
"type": "object",
"required": [
"ok",
"service"
],
"properties": {
"ok": {
"type": "boolean",
"description": "Handler success"
},
"brief": {
"type": "string",
"description": "Decision procedure prose for agents"
},
"model": {
"type": "string"
},
"topic": {
"type": "string"
},
"service": {
"type": "string",
"description": "Service slug"
},
"procedure": {
"type": "string"
},
"generatedAt": {
"type": "string",
"description": "ISO-8601 timestamp"
},
"generationSource": {
"enum": [
"llm",
"reasoning",
"deterministic"
],
"type": "string"
}
}
},
"payment": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"payer": {
"type": "string"
},
"detail": {
"type": "string"
},
"selfPay": {
"type": "boolean"
},
"transaction": {
"type": "string"
}
}
},
"service": {
"type": "string"
},
"provider": {
"type": "string",
"const": "K-2SO"
}
}
},
"verifyDetail": "missing PAYMENT-SIGNATURE"
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.002USDC≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0xc85f…A0604. The signed payment is good for 5 minutes.
- Paid to
- 0xc85f…A0604
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xc85f0CF16F5e677bBE5dFc94662Cc86F2FbA0604",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"meta": "0",
"topic": "example"
}
},
"output": {
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "deterministic-settlement-phase-procedure-for-x40",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "deterministic-settlement-phase-procedure-for-x40",
"provider": "K-2SO"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"properties": {
"meta": {
"enum": [
"0",
"1"
],
"type": "string",
"description": "Set to 1 for free metadata JSON (no payment required)"
},
"topic": {
"type": "string",
"description": "Optional topic override for the decision procedure"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"title": "Paid delivery receipt verification procedure paid response",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"ok",
"paid",
"service",
"provider",
"result"
],
"properties": {
"ok": {
"type": "boolean"
},
"paid": {
"type": "boolean"
},
"result": {
"type": "object",
"required": [
"ok",
"service"
],
"properties": {
"ok": {
"type": "boolean",
"description": "Handler success"
},
"brief": {
"type": "string",
"description": "Decision procedure prose for agents"
},
"model": {
"type": "string"
},
"topic": {
"type": "string"
},
"service": {
"type": "string",
"description": "Service slug"
},
"procedure": {
"type": "string"
},
"generatedAt": {
"type": "string",
"description": "ISO-8601 timestamp"
},
"generationSource": {
"enum": [
"llm",
"reasoning",
"deterministic"
],
"type": "string"
}
}
},
"payment": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"payer": {
"type": "string"
},
"detail": {
"type": "string"
},
"selfPay": {
"type": "boolean"
},
"transaction": {
"type": "string"
}
}
},
"service": {
"type": "string"
},
"provider": {
"type": "string",
"const": "K-2SO"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-10 17:22Z
- Last indexed by Roundhouse
- 2026-08-29 00:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 18:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 525
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service k2so.wrong.systems and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=k2so.wrong.systems' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://k2so.wrong.systems/api/services/deterministic-settlement-phase-procedure-for-x40, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.