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ProposalCheck
x402
ProposalCheck is a paid API for AI agents from launchcheck-x402.fly.dev, paid per call via x402, $1/call, status unknown (last checked 2026-09-15).
Stress-tests a product, feature, API, implementation, or business proposal and returns a structured green-light, revise, or rethink decision with detailed analysis.
Price / call$1
Success—
StatusUnknown
How this service works
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.
Output
A structured evaluation covering the proposal's core thesis, key assumptions, differentiation, technical and economic feasibility, scope assessment, dependencies, validation strategy, kill criteria, and recommended build sequence — culminating in a green-light, revise, or rethink decision with supporting rationale.
Example use cases
Pre-commit feature feasibility check
“Before I ask my team to spend a sprint on this, can you stress-test my feature proposal: adding AI-powered expense categorization to our accounting app? It's a feature proposal targeting small business owners, and I want to know whether to green-light it or revise the scope given that we have no ML infrastructure today.”
Startup idea validation before funding pitch
“I'm about to pitch investors and I want to pressure-test my business proposal first — it's a two-sided marketplace for freelance industrial designers and hardware startups. Can you evaluate the core thesis, assumptions, economics, and differentiation, and tell me whether to go ahead or rethink before I commit more time?”
API service viability before engineering sprint
“We're considering building a paid API service for real-time supply chain risk scoring. Can you stress-test this api-service proposal, with context that we're a 4-person team with 6 months of runway, targeting procurement teams at mid-market manufacturers, and the decision I need is whether to kick off a technical spike next week?”
Technical details
Endpoint
POSThttps://launchcheck-x402.fly.dev/v1/proposal-checkWhen to prefer
Choose ProposalCheck when you need a structured, multi-dimensional go/no-go decision on a proposal before committing engineering time, budget, or team resources — especially when you want explicit coverage of assumptions, economics, kill criteria, and build sequencing in a single call. Prefer it over generic LLM prompting when you need a repeatable, auditable evaluation format with a clear decision output.
Side effects
- Proposal text too short (under 40 characters) returns validation error
- Proposal text exceeds 32,000 character limit returns payload error
- Vague or underspecified proposals may yield low-confidence or generic recommendations
- Missing product context for niche domains may reduce accuracy of feasibility and economics analysis
- Payment failure via x402 protocol returns 402 status blocking the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| proposal | string | Product, feature, API, implementation, or business proposal to stress-test before investing meaningful time or money. |
| constraints | array | Optional factual, strategic, technical, legal, or scope constraints the review must preserve. |
| proposalType | string | Kind of proposal being reviewed. |
| productContext | string | Optional product, company, market, or technical context needed to interpret the proposal accurately. |
| targetAudience | string | Optional intended users, buyers, developers, or stakeholders whose needs matter to the decision. |
| desiredDecision | string | Optional decision the review should inform, such as whether to green-light an MVP, technical spike, feature, or launch investment. |
Tags
x402
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