# agentutility — paid x402 endpoints for autonomous agents

> agentutility — paid x402 endpoints for autonomous agents is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

## Facts

- Endpoint: POST https://x402.agentutility.ai/ncbi-taxonomy-lookup
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ncbi-taxonomy-lookup-7e8775f8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Hi0ocRHBxtoZTsWKk0hiR

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 ncbi-taxonomy-lookup-7e8775f8 -d '<json body>'
```

## How this service works

Paid x402 endpoints organized into product clusters. USDC-settled on Base. MCP-callable. ERC-8004 identity registry agentId 47167.

## 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": {
     "properties": {
      "organism": {
       "type": "string",
       "description": "Common or scientific organism name to resolve, e.g. 'Panthera leo' or 'lion'. Required, max 200 chars."
      },
      "rank": {
       "type": "string",
       "description": "Optional taxonomic rank to filter the returned lineage to, e.g. 'family' or 'genus'."
      }
     },
     "required": [
      "organism"
     ]
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "taxid": {
       "type": "string"
      },
      "scientific_name": {
       "type": "string"
      },
      "rank": {
       "type": "string"
      },
      "lineage": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "rank": {
          "type": "string"
         },
         "name": {
          "type": "string"
         },
         "taxid": {
          "type": "string"
         }
        }
       }
      },
      "source": {
       "type": "string"
      }
     }
    }
   },
   "required": [
    "type"
   ]
  }
 },
 "required": [
  "input"
 ]
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "rank": "species",
  "taxid": "9689",
  "source": "NCBI E-utilities (taxonomy)",
  "lineage": [
   {
    "name": "Eukaryota",
    "rank": "domain",
    "taxid": "2759"
   },
   {
    "name": "Carnivora",
    "rank": "order",
    "taxid": "33554"
   },
   {
    "name": "Felidae",
    "rank": "family",
    "taxid": "9681"
   }
  ],
  "scientific_name": "Panthera leo"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ncbi-taxonomy-lookup-7e8775f8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.agentutility.ai](https://www.zero.xyz/host/x402.agentutility.ai/llms.txt)