# claw402 RootData Projects by Tag

> claw402 RootData Projects by Tag is a paid API for AI agents from claw402.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Fetches a paginated list of blockchain/crypto projects from RootData filtered by one or more tag IDs, paid per-call with USDC via x402.

## Facts

- Endpoint: GET https://claw402.ai/api/v1/crypto/rootdata/projects-by-tag
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/claw402-rootdata-projects-by-tag-19d7a098
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9F6q-HCSdVDbnYFsANNfD

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 claw402-rootdata-projects-by-tag-19d7a098
```

Example prompt: Pull the first page of 20 blockchain projects tagged with RootData tag ID 5 — I want to see what projects fall under that category.

## When to prefer this

Use this endpoint when you need to discover or enumerate crypto/Web3 projects organized by RootData taxonomy tags without requiring API key registration — ideal for agent workflows that pay per call in USDC and need programmatic access to RootData's project categorization data.

## Known failure modes

- Invalid or nonexistent tag_ids returns empty data array with code 0
- Missing required query parameters may return an error or empty result
- Payment failure via x402 prevents the request from completing
- Rate limiting or wallet balance issues block access
- Large page_size values may time out or return partial data

## How this service works

Backed by vergex.trade. Pay for any API with USDC. No API keys. No registration. Just a wallet.

## Output

Returns a JSON object with a status code and a data array containing project records matching the specified tag IDs, paginated according to the page and page_size parameters.

## 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",
     "properties": {
      "page": {
       "type": "string"
      },
      "tag_ids": {
       "type": "string"
      },
      "page_size": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "code": 0,
  "data": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/claw402-rootdata-projects-by-tag-19d7a098/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from claw402.ai](https://www.zero.xyz/host/claw402.ai/llms.txt)