ProposalCheck
Stress-test a product, feature, API, implementation, or business proposal before meaningful investment. ProposalCheck evaluates the core thesis, assumptions, differentiation, feasibility, economics, scope, dependencies, validation strategy, kill criteria, and recommended build sequence, then returns a structured green-light, revise, or rethink decision.
OtherLiveeip155:8453Exactvia cdp
Proposal-reviewProduct-validationProduct-strategyTechnical-reviewMvp
Calls · 30d
1↓ 86%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 24 snapshots so far.
$47.00
Verified settled volume
27 settlements proven x402 by their on-chain EIP-3009 marker.
$1.00
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 2026-08-19 21:36Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x87F929c4eCac1556a507cE6b92eF95c52B28DBa4The 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.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
1USDC≈ $1 USD
on Base · exact scheme
Pay 1 USDC on Base to 0x87F9…8DBa4. The signed payment is good for 5 minutes.
- Paid to
- 0x87F9…8DBa4
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 1000000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x87F929c4eCac1556a507cE6b92eF95c52B28DBa4",
"amount": "1000000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"proposal": "Build a narrow paid API that evaluates product proposals before engineering begins. Start with one structured review endpoint, measure real inference cost and repeat buyer behavior, and stop investing if unrelated buyers do not return after the first validation window.",
"constraints": [
"Do not invent traction or external market facts"
],
"proposalType": "api-service",
"productContext": "An x402-paid sibling endpoint to an existing launch-copy review service.",
"targetAudience": "Founders, product teams, developers, and autonomous agents.",
"desiredDecision": "Decide whether to green-light the bounded MVP implementation."
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"meta": {
"model": "openai/gpt-5.6-terra",
"cached": false,
"engine": "openai-compatible",
"generatedAt": "2026-08-13T12:00:00.000Z"
},
"report": {
"risks": [],
"score": 70,
"verdict": "revise",
"scopeCuts": [],
"strengths": [],
"coreThesis": "Validate demand before expanding the build.",
"assumptions": [],
"killCriteria": [],
"inputIntegrity": {
"status": "clean",
"evidence": []
},
"recommendation": "Revise around one measurable validation step.",
"validationPlan": [],
"requiredChanges": [
"Define the cheapest demand test."
],
"executiveSummary": "The proposal needs a smaller validation step.",
"economicsAssessment": {
"rating": "unclear",
"summary": "Measure real cost and demand.",
"keyQuestion": null
},
"optionalImprovements": [],
"feasibilityAssessment": {
"rating": "credible",
"summary": "A bounded test is feasible.",
"keyQuestion": null
},
"recommendedBuildSequence": [],
"differentiationAssessment": {
"rating": "unclear",
"summary": "Differentiation still needs evidence.",
"keyQuestion": null
}
},
"requestId": "example"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"proposal",
"proposalType",
"constraints"
],
"properties": {
"proposal": {
"type": "string",
"maxLength": 32000,
"minLength": 40,
"description": "Product, feature, API, implementation, or business proposal to stress-test before investing meaningful time or money."
},
"constraints": {
"type": "array",
"items": {
"type": "string",
"maxLength": 300,
"minLength": 1
},
"default": [],
"maxItems": 10,
"description": "Optional factual, strategic, technical, legal, or scope constraints the review must preserve."
},
"proposalType": {
"enum": [
"product",
"feature",
"api-service",
"implementation",
"business",
"other"
],
"type": "string",
"default": "other",
"description": "Kind of proposal being reviewed."
},
"productContext": {
"type": "string",
"maxLength": 2000,
"description": "Optional product, company, market, or technical context needed to interpret the proposal accurately."
},
"targetAudience": {
"type": "string",
"maxLength": 1000,
"description": "Optional intended users, buyers, developers, or stakeholders whose needs matter to the decision."
},
"desiredDecision": {
"type": "string",
"maxLength": 500,
"description": "Optional decision the review should inform, such as whether to green-light an MVP, technical spike, feature, or launch investment."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"requestId",
"report",
"meta"
],
"properties": {
"meta": {
"type": "object",
"required": [
"engine",
"model",
"generatedAt",
"cached"
],
"properties": {
"model": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"cached": {
"type": "boolean"
},
"engine": {
"type": "string"
},
"generatedAt": {
"type": "string",
"pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(?:\\.\\d+)?(?:Z|[+-]\\d{2}:\\d{2})$"
}
},
"additionalProperties": false
},
"report": {
"type": "object",
"required": [
"verdict",
"score",
"inputIntegrity",
"executiveSummary",
"coreThesis",
"strengths",
"risks",
"assumptions",
"differentiationAssessment",
"feasibilityAssessment",
"economicsAssessment",
"scopeCuts",
"requiredChanges",
"optionalImprovements",
"validationPlan",
"killCriteria",
"recommendedBuildSequence",
"recommendation"
],
"properties": {
"risks": {
"type": "array",
"items": {
"type": "object",
"required": [
"category",
"severity",
"title",
"evidence",
"whyItMatters",
"mitigation"
],
"properties": {
"title": {
"type": "string",
"maxLength": 160,
"minLength": 1
},
"category": {
"enum": [
"positioning",
"differentiation",
"implementation",
"economics",
"scope",
"dependency",
"validation"
],
"type": "string"
},
"evidence": {
"type": "string",
"maxLength": 600,
"minLength": 1
},
"severity": {
"enum": [
"low",
"medium",
"high",
"critical"
],
"type": "string"
},
"mitigation": {
"type": "string",
"maxLength": 800,
"minLength": 1
},
"whyItMatters": {
"type": "string",
"maxLength": 800,
"minLength": 1
}
},
"additionalProperties": false
},
"maxItems": 10
},
"score": {
"type": "integer",
"maximum": 100,
"minimum": 0
},
"verdict": {
"enum": [
"green-light",
"revise",
"rethink"
],
"type": "string"
},
"scopeCuts": {
"type": "array",
"items": {
"type": "string",
"maxLength": 600,
"minLength": 1
},
"maxItems": 10
},
"strengths": {
"type": "array",
"items": {
"type": "string",
"maxLength": 500,
"minLength": 1
},
"maxItems": 10
},
"coreThesis": {
"type": "string",
"maxLength": 900,
"minLength": 1
},
"assumptions": {
"type": "array",
"items": {
"type": "object",
"required": [
"assumption",
"confidence",
"impactIfWrong",
"cheapestValidation"
],
"properties": {
"assumption": {
"type": "string",
"maxLength": 500,
"minLength": 1
},
"confidence": {
"enum": [
"supported",
"plausible",
"weak",
"unknown"
],
"type": "string"
},
"impactIfWrong": {
"type": "string",
"maxLength": 700,
"minLength": 1
},
"cheapestValidation": {
"type": "string",
"maxLength": 800,
"minLength": 1
}
},
"additionalProperties": false
},
"maxItems": 12
},
"killCriteria": {
"type": "array",
"items": {
"type": "string",
"maxLength": 600,
"minLength": 1
},
"maxItems": 10
},
"inputIntegrity": {
"type": "object",
"required": [
"status",
"evidence"
],
"properties": {
"status": {
"enum": [
"clean",
"embedded-instructions-detected"
],
"type": "string"
},
"evidence": {
"type": "array",
"items": {
"type": "string",
"maxLength": 300,
"minLength": 1
},
"maxItems": 4
}
},
"additionalProperties": false
},
"recommendation": {
"type": "string",
"maxLength": 1500,
"minLength": 1
},
"validationPlan": {
"type": "array",
"items": {
"type": "object",
"required": [
"experiment",
"signal",
"passCondition",
"failCondition"
],
"properties": {
"signal": {
"type": "string",
"maxLength": 500,
"minLength": 1
},
"experiment": {
"type": "string",
"maxLength": 700,
"minLength": 1
},
"failCondition": {
"type": "string",
"maxLength": 500,
"minLength": 1
},
"passCondition": {
"type": "string",
"maxLength": 500,
"minLength": 1
}
},
"additionalProperties": false
},
"maxItems": 10
},
"requiredChanges": {
"type": "array",
"items": {
"type": "string",
"maxLength": 600,
"minLength": 1
},
"maxItems": 10
},
"executiveSummary": {
"type": "string",
"maxLength": 1500,
"minLength": 1
},
"economicsAssessment": {
"type": "object",
"required": [
"rating",
"summary",
"keyQuestion"
],
"properties": {
"rating": {
"enum": [
"strong",
"credible",
"weak",
"unclear",
"not-applicable"
],
"type": "string"
},
"summary": {
"type": "string",
"maxLength": 900,
"minLength": 1
},
"keyQuestion": {
"anyOf": [
{
"type": "string",
"maxLength": 500,
"minLength": 1
},
{
"type": "null"
}
]
}
},
"additionalProperties": false
},
"optionalImprovements": {
"type": "array",
"items": {
"type": "string",
"maxLength": 600,
"minLength": 1
},
"maxItems": 10
},
"feasibilityAssessment": {
"type": "object",
"required": [
"rating",
"summary",
"keyQuestion"
],
"properties": {
"rating": {
"enum": [
"strong",
"credible",
"weak",
"unclear"
],
"type": "string"
},
"summary": {
"type": "string",
"maxLength": 900,
"minLength": 1
},
"keyQuestion": {
"anyOf": [
{
"type": "string",
"maxLength": 500,
"minLength": 1
},
{
"type": "null"
}
]
}
},
"additionalProperties": false
},
"recommendedBuildSequence": {
"type": "array",
"items": {
"type": "string",
"maxLength": 600,
"minLength": 1
},
"maxItems": 12
},
"differentiationAssessment": {
"type": "object",
"required": [
"rating",
"summary",
"keyQuestion"
],
"properties": {
"rating": {
"enum": [
"strong",
"credible",
"weak",
"unclear"
],
"type": "string"
},
"summary": {
"type": "string",
"maxLength": 900,
"minLength": 1
},
"keyQuestion": {
"anyOf": [
{
"type": "string",
"maxLength": 500,
"minLength": 1
},
{
"type": "null"
}
]
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"requestId": {
"type": "string",
"minLength": 1
}
},
"additionalProperties": false
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-19 21:36Z
- Last indexed by Roundhouse
- 2026-09-18 21:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 18:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 404
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. 24 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 ProposalCheck 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=ProposalCheck' 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://launchcheck-x402.fly.dev/v1/proposal-check, 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.