# YourAITools ToolPick – x402 AI API Directory Search

> YourAITools ToolPick – x402 AI API Directory Search is a paid API for AI agents from api.youraitools.co, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-24).

Searches a curated directory of 300+ AI tools, APIs, and agents payable via x402 (USDC on Base/Solana) and returns ranked, live-verified matches for a stated capability need.

## Facts

- Endpoint: GET https://api.youraitools.co/toolpick/v1/pick?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/youraitools-toolpick-x402-ai-api-directory-search-d9b0fcf7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MfZooRbRanAr7scdcVUcE

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 youraitools-toolpick-x402-ai-api-directory-search-d9b0fcf7
```

Example prompt: Find me the best x402-payable API for web search that works on Base, costs no more than $0.01 per call, and has at least 10 unique payers in the last 30 days.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which x402-compatible APIs exist for a given capability and wants to pay per call in USDC on Base, Solana, or other supported chains. It is uniquely suited for agent-to-agent orchestration where the agent must self-select a downstream tool at runtime, rather than having a hardcoded API dependency. Prefer this over general API marketplaces when crypto-native payment (x402 protocol) and live-verification of endpoint status are required.

## Known failure modes

- No matches found for an obscure or overly specific 'need' query — returns empty results array
- Stale index if refreshed_at is old — results may not reflect recently added or removed endpoints
- Live check failures if endpoint is temporarily down — verified_live may be false for otherwise valid APIs
- Network filter too restrictive — limiting to a rare network may return zero results
- min_payers threshold too high — filters out newly listed but functional APIs
- Price cap too low — eliminates most available endpoints

## How this service works

API finder for AI agents (live-checked). Pick the paid x402 API to call: top 10 ranked resources for your need (relevance, 30-day payers and calls, recency, price; filters), a live check of the top 5 (one unpaid request each, 3 s timeout: 402 with x402 terms, live price and networks, matches the listing?), the best verified pick, the cheapest verified alternative and category price stats. Fail-closed: a failed check is never called verified; none verified means best_pick null, low confidence.

## Output

A JSON object containing: matched API endpoints ranked by relevance and usage score, each with host, service name, resource URL, HTTP method, price in USD, supported networks, 30-day call count, payer count, live-check status (latency, HTTP status, x402 version, live price), and a 'best_pick' object highlighting the top recommended endpoint with reasoning. Also includes aggregate stats (total hosts, price percentiles, estimated revenue), applied filters, index freshness, and a confidence rating.

## 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": [
      "need"
     ],
     "properties": {
      "need": {
       "type": "string",
       "description": "The capability you need, in plain words, e.g. \"solana token safety\", \"web search\", \"pdf to text\", \"hyperliquid funding rates\" (2-200 chars)"
      },
      "network": {
       "enum": [
        "any",
        "base",
        "solana",
        "polygon",
        "arbitrum",
        "optimism",
        "ethereum",
        "avalanche"
       ],
       "type": "string",
       "description": "Only resources payable on this network (default any)"
      },
      "max_price": {
       "type": "number",
       "description": "Only resources priced at or below this many USD per call, e.g. 0.01"
      },
      "min_payers": {
       "type": "integer",
       "description": "Only resources with at least this many unique payers in the last 30 days (default 0)"
      }
     },
     "description": "Search intents: api recommendation, pick best api, x402 api ranking, live api check, agent tool selection, api marketplace search"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "need": "web search",
  "tier": "pick",
  "hosts": 236,
  "index": {
   "age_s": 600,
   "stale": false,
   "refreshed_at": "2026-10-23T12:59:10.247Z"
  },
  "stats": {
   "hosts": 236,
   "calls_30d": 64331,
   "price_usd": {
    "max": 0.02,
    "min": 0.001,
    "p25": 0.003,
    "p75": 0.01,
    "median": 0.01
   },
   "resources": 700,
   "priced_resources": 700,
   "est_revenue_30d_usd": 555.82,
   "price_with_buyers_usd": {
    "p25": 0.003,
    "p75": 0.01,
    "median": 0.00625,
    "payer_weighted_median": 0.01
   },
   "hosts_with_3plus_payers": 125
  },
  "terms": [
   "web",
   "search"
  ],
  "filters": {
   "network": "any",
   "max_price": 0.02,
   "min_payers": 0
  },
  "matches": 700,
  "results": [
   {
    "host": "api.exa.ai",
    "rank": 1,
    "score": 4.843,
    "method": "POST",
    "service": "Exa",
    "networks": [
     "base",
     "solana"
    ],
    "resource": "https://api.exa.ai/search",
    "calls_30d": 6614,
    "price_usd": 0.007,
    "relevance": 0.85,
    "indexed_on": [
     "cdp"
    ],
    "live_check": {
     "ms": 363,
     "status": "live",
     "http_status": 402,
     "x402_version": 2,
     "live_networks": [
      "base",
      "solana"
     ],
     "live_price_usd": 0.007,
     "price_matches_index": true
    },
    "payers_30d": 92,
    "description": "Exa /search endpoint",
    "repeat_buyers": true,
    "verified_live": true,
    "last_called_at": "2026-10-23T11:14:01.000Z"
   },
   {
    "host": "agent.pocket.network",
    "rank": 2,
    "score": 4.215,
    "method": "POST",
    "service": "Pocket Network",
    "networks": [
     "base"
    ],
    "resource": "https://agent.pocket.network/v1/agentsearch-web-search-v1",
    "calls_30d": 2843,
    "price_usd": 0.005,
    "relevance": 1,
    "indexed_on": [
     "cdp"
    ],
    "live_check": {
     "ms": 510,
     "status": "live",
     "http_status": 402,
     "x402_version": 2,
     "live_networks": [
      "base"
     ],
     "live_price_usd": 0.005,
     "price_matches_index": true
    },
    "payers_30d": 13,
    "description": "Web search built for agents, served over Pocket Ne",
    "repeat_buyers": true,
    "verified_live": true,
    "last_called_at": "2026-10-23T12:06:00.000Z"
   }
  ],
  "best_pick": {
   "why": "highest-ranked candidate that answered 402 with matching x402 terms in the live check",
   "rank": 1,
   "method": "POST",
   "service": "Exa",
   "networks": [
    "base",
    "solana"
   ],
   "resou
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/youraitools-toolpick-x402-ai-api-directory-search-d9b0fcf7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.youraitools.co](https://www.zero.xyz/host/api.youraitools.co/llms.txt)