# Arkham Tag Summary

> Arkham Tag Summary is a paid API for AI agents from api.arkm.com, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).

Returns aggregate statistics for a specific Arkham intelligence tag, including entity count, address count, and unique tag parameter count.

## Facts

- Endpoint: POST https://api.arkm.com/x402/tag/summary
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arkham-tag-summary-aee55149
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HGLINkjl6XWB2YKDG76xb

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 arkham-tag-summary-aee55149 -d '<json body>'
```

Example prompt: Pull the Arkham tag summary for 'proof-of-reserves' — I want to know how many entities and wallet addresses are associated with that tag, and how many unique tag parameters exist.

## When to prefer this

Use this endpoint when you need aggregate statistics about a named Arkham intelligence tag — specifically entity count, address count, and parameter diversity — rather than individual wallet or entity details. Prefer this over broader entity search endpoints when you only need top-level tag-level summaries without per-entity data.

## Known failure modes

- Unknown or misspelled tagId returns empty or error response
- Tag exists but has zero entities/addresses if recently created
- x402 payment failure if USDC balance is insufficient
- Rate limiting or authentication errors if API key is invalid
- Network timeout if Arkham backend is under load

## How this service works

Get Arkham tag summary statistics. $0.20 per call.

## Output

Returns a JSON object with the tagId, total number of entities bearing that tag (numEntities), total number of associated blockchain addresses (numAddresses), and the number of unique tag parameter variants (numUniqueTagParams). Example: proof-of-reserves tag has 41 entities, 1,469,166 addresses, and 39 unique tag params.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "id": {
   "anyOf": [
    {
     "type": "string"
    },
    {
     "type": "number"
    },
    {
     "type": "boolean"
    },
    {
     "type": "array",
     "items": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "number"
       },
       {
        "type": "boolean"
       }
      ]
     }
    }
   ],
   "description": "The tag identifier to retrieve summary statistics for."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tagId": "proof-of-reserves",
  "numEntities": 41,
  "numAddresses": 1469166,
  "numUniqueTagParams": 39
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arkham-tag-summary-aee55149/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.arkm.com](https://www.zero.xyz/host/api.arkm.com/llms.txt)