# ProposalCheck Premium

> ProposalCheck Premium is a paid API for AI agents from launchcheck-x402.fly.dev, paid per call via x402, $2/call, status unknown (last checked 2026-09-13).

Deep red-team analysis of a product or technical proposal using extended reasoning to surface counter-theses, hidden dependencies, flawed economics, and critical unknowns before committing investment.

## Facts

- Endpoint: POST https://launchcheck-x402.fly.dev/v1/proposal-check/deep
- Price: $2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/proposalcheck-premium-85e2ee5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NVsov6N5sEPpC3ME3d5kB

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability proposalcheck-premium-85e2ee5a -d '<json body>'
```

Example prompt: Red-team this product proposal for me before I greenlight the MVP build — it's a B2B SaaS tool for automating compliance audits for mid-market companies, targeting compliance officers, and I want to know if the economics hold, what hidden dependencies exist, and what could kill it before we invest $200k in development. The decision I need to make is whether to proceed to an MVP or pivot.

## When to prefer this

Choose ProposalCheck Premium over the standard ProposalCheck when the decision is high-stakes (significant time, money, or reputational capital at risk), when you need deeper counter-thesis development, when the proposal involves complex multi-party dependencies or intricate economics, or when a superficial critique is insufficient. The larger reasoning budget makes it suitable for longer proposals up to 32,000 characters and situations where thoroughness matters more than speed. Prefer the standard tier for quick early-stage gut checks.

## Known failure modes

- Proposal text too short (under 40 characters) returns validation error
- Proposal text exceeds 32,000 character limit
- Invalid proposalType enum value
- Constraints array exceeds 10 items or individual constraint exceeds 300 characters
- Payment of $2 USDC not fulfilled via x402 protocol returns 402 Payment Required
- Service timeout on unusually complex proposals due to extended reasoning budget
- Malformed JSON body returns 400 error

## How this service works

Deep red-team a product or technical proposal before a consequential investment. Uses a larger reasoning budget to test counter-theses, hidden dependencies, supplied economics, and decisive unknowns. Typical completion time is ~2-3 minutes. Clients should allow up to 4 minutes before timing out.

## Output

A deep red-team report containing counter-theses challenging the proposal's core assumptions, analysis of hidden dependencies and risks, critique of the supplied economics, identification of decisive unknowns, and an overall stress-test verdict to inform the go/no-go decision. Metadata includes the model used, generation timestamp, and request ID.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "type": "object",
     "properties": {
      "proposal": {
       "type": "string",
       "minLength": 40,
       "maxLength": 32000,
       "description": "Product, feature, API, implementation, or business proposal to stress-test before investing meaningful time or money."
      },
      "proposalType": {
       "default": "other",
       "description": "Kind of proposal being reviewed.",
       "type": "string",
       "enum": [
        "product",
        "feature",
        "api-service",
        "implementation",
        "business",
        "other"
       ]
      },
      "productContext": {
       "description": "Optional product, company, market, or technical context needed to interpret the proposal accurately.",
       "type": "string",
       "maxLength": 2000
      },
      "targetAudience": {
       "description": "Optional intended users, buyers, developers, or stakeholders whose needs matter to the decision.",
       "type": "string",
       "maxLength": 1000
      },
      "desiredDecision": {
       "description": "Optional decision the review should inform, such as whether to green-light an MVP, technical spike, feature, or launch investment.",
       "type": "string",
       "maxLength": 500
      },
      "constraints": {
       "default": [],
       "description": "Optional factual, strategic, technical, legal, or scope constraints the review must preserve.",
       "maxItems": 10,
       "type": "array",
       "items": {
        "type": "string",
        "minLength": 1,
        "maxLength": 300
       }
      }
     },
     "required": [
      "proposal",
      "proposalType",
      "constraints"
     ],
     "additionalProperties": false
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "$schema": "https://json-schema.org/draft/2020-1
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/proposalcheck-premium-85e2ee5a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from launchcheck-x402.fly.dev](https://www.zero.xyz/host/launchcheck-x402.fly.dev/llms.txt)