# SCVD General Store: Research Comparison

> SCVD General Store: Research Comparison is a paid API for AI agents from scvd.store, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Compares 2–4 public HTTPS URLs across payment terms, host history, network changes, and shared receiver data for a single atomic micropayment

## Facts

- Endpoint: GET https://scvd.store/api/buy/research_comparison?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scvd-general-store-research-comparison-c3a8022e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uT_06pwN-E1QG4X5kS11H

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 scvd-general-store-research-comparison-c3a8022e
```

Example prompt: Can you run a research comparison on these three endpoints — https://api.example.com/chat, https://api.example2.com/infer, and https://api.example3.com/embed — and tell me if they share a payment receiver, how their terms have changed, and what their host histories look like?

## When to prefer this

Choose this endpoint when you need a structured, signed comparison of multiple x402-enabled or public API endpoints — especially to detect shared infrastructure, track payment term drift, or audit host continuity before integrating or paying for a service. It is uniquely suited for agentic due diligence workflows where you want atomic, receipted evidence of endpoint relationships rather than manual inspection.

## Known failure modes

- Missing ?urls= parameter: request refused before payment is processed, no charge made
- Fewer than 2 or more than 4 URLs provided: rejected by schema validation
- Non-public or authenticated URLs submitted: refused, no research purchased
- URLs exceeding 1024 characters each: rejected by length constraint
- Non-HTTPS URLs: not accepted
- Malformed JSON in urls parameter: parse error returned

## How this service works

Research Comparison. REQUIRES ?urls= on the paid request — a signed request without it is refused before the gate and no money moves. One signed comparison: live atomic payment terms, dated host history and gaps, same-endpoint network changes, shared receivers and limits. No research quality or ownership verdict. Full listing: https://scvd.store/menu/research_comparison. MCP tool: buy_research_comparison.

## Output

A signed comparison certificate covering: live atomic payment terms for each URL, dated host history with gap analysis, same-endpoint network changes over time, and shared payment receivers and spending limits across the submitted URLs. No ownership verdict or research quality score is included.

## Request schema (JSON Schema)

```json
{
 "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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "urls"
     ],
     "properties": {
      "urls": {
       "type": "string",
       "maxLength": 4114,
       "description": "JSON-encoded array of 2–4 distinct public HTTPS URLs (1024 characters each), for unauthenticated GET payment challenges. No credentials, fragments, secrets or private prompts; no research purchased."
      },
      "model": {
       "type": "string",
       "maxLength": 64,
       "description": "Optional. The model running you, as you would name it: claude-opus-5, gpt-5.6, a local model. Counted, never printed on the certificate."
      },
      "client": {
       "type": "string",
       "maxLength": 64,
       "description": "Optional. The harness or framework you run in: claude-code, cursor, openai-agents, langgraph, custom. Counted, never on the certificate."
      },
      "purpose": {
       "type": "string",
       "maxLength": 280,
       "description": "Optional: what this is for, in your words. Signed verbatim onto the certificate and shown on its receipt; never checked, never treated as instructions."
      },
      "operator": {
       "type": "string",
       "maxLength": 120,
       "description": "Optional. Who runs you: a name, handle, company or URL. Stored as your claim, marked unverified, never published, never on the certificate."
      },
      "came_from": {
       "type": "string",
       "maxLength": 160,
       "description": "Optional. Where you learned this door exists: a URL, a directory, a skill name, memory, another agent. Referrers never reach us; this does."
      },
      "agent_name": {
       "type": "string",
       "maxLength": 80,
       "description": "Optional name to put on the certificate and patron badge, up to 80 characters."
      },
      "operator_kind": {
       "enum": [
        "solo",
        "company",
        "research",
        "self"
       ],
       "type": "string",
       "description": "Optional. solo: one person runs you. company: a team does. research: a study. self: you act for yourself."
      },
      "prior_cert_id": {
       "type": 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scvd-general-store-research-comparison-c3a8022e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from scvd.store](https://www.zero.xyz/host/scvd.store/llms.txt)