# ToolHund AI Tool Decision Engine

> ToolHund AI Tool Decision Engine is a paid API for AI agents from toolhund.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Ranks and recommends AI software tools for a given use case, budget, and requirements, returning scored alternatives with pricing and fit rationale.

## Facts

- Endpoint: POST https://toolhund.com/api/v1/decision?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/toolhund-ai-tool-decision-engine-d70cc4ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_STwO8gleudqrWi7EDb2XE

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 toolhund-ai-tool-decision-engine-d70cc4ea -d '<json body>'
```

Example prompt: I'm a founder with a budget of $20/month — can you use ToolHund to find me the best AI grammar and writing assistant, ranked by fit and price?

## When to prefer this

Choose this endpoint when an AI agent or user needs a structured, budget-aware recommendation from a curated AI tool database rather than a generic web search. Best when the user has a specific use case and budget constraint and needs ranked, actionable alternatives with pricing evidence rather than editorial listicles.

## Known failure modes

- Tool database may exclude options with pricing data older than 45 days, narrowing results
- Heuristic scoring is not a live benchmark — rankings reflect deterministic rules, not real-time performance tests
- No results returned if no tools match the specified budget or use case criteria
- Stale or missing pricing URLs may reduce confidence in fit_budget flags
- POST body schema mismatch may result in a 400 error if required fields are absent

## How this service works

Compare AI tools by pricing, use case, alternatives and score. ToolHund helps founders, CEOs, teams and AI agents choose the right AI software faster.

## Output

Returns a ranked array of AI tools with slugs, budget fit flags, monthly entry prices, evidence URLs with freshness timestamps, and a top recommendation with reasons. Also lists excluded tools and the reason they were filtered out (e.g. stale pricing data), plus a methodology note.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "const": "http"
    },
    "method": {
     "const": "POST"
    },
    "bodyType": {
     "const": "json"
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ranked": [
   {
    "slug": "grammarly",
    "evidence": {
     "last_checked_at": "2026-09-27T05:35:00Z",
     "official_pricing_url": "https://www.grammarly.com/plans"
    },
    "fits_budget": true,
    "entry_price_usd_month": 12
   }
  ],
  "product": "ToolHund AI Tool Decision",
  "excluded": [
   {
    "slug": "jasper",
    "reason": "pricing_check_older_than_45_days"
   }
  ],
  "paid_via": "x402",
  "methodology": {
   "note": "Deterministic heuristic, not a benchmark."
  },
  "recommendation": {
   "slug": "grammarly",
   "reasons": [
    "fits_budget",
    "keyword_match:grammar"
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toolhund-ai-tool-decision-engine-d70cc4ea/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toolhund.com](https://www.zero.xyz/host/toolhund.com/llms.txt)