# Arkham Entity Transaction History

> Arkham Entity Transaction History is a paid API for AI agents from api.arkm.com, paid per call via x402, $0.4/call, status unknown (last checked 2026-09-14).

Returns historical on-chain transaction volume (USD) for a named entity across multiple blockchains over time

## Facts

- Endpoint: POST https://api.arkm.com/x402/history/entity
- Price: $0.4/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arkham-entity-transaction-history-bbda4737
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B0TFxljQT2Lx-lChO69y3

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-entity-transaction-history-bbda4737 -d '<json body>'
```

Example prompt: Pull the historical on-chain transaction volume for Alameda Research from Arkham — I want to see daily USD totals for both Bitcoin and Ethereum from January 2022 onwards.

## When to prefer this

Use this endpoint when you need time-series on-chain transaction volume data for a specific named entity (exchange, fund, wallet cluster) as tracked by Arkham Intelligence's entity labeling system. Prefer this over raw blockchain explorers when you need human-readable entity names rather than raw addresses, and when you want multi-chain aggregated USD volumes in a single call. Best suited for research, due diligence, or monitoring of well-known crypto organizations that Arkham has already labeled.

## Known failure modes

- Entity name not recognized by Arkham — returns empty or error response
- Insufficient USDC balance for x402 payment — request rejected before processing
- Invalid or missing API key — 401 unauthorized response
- Requested time range has no data — empty arrays returned per chain
- Network or rate limit error — 429 or 5xx response

## How this service works

Get Arkham historical data for an entity. $0.40 per call.

## Output

Returns a JSON object keyed by blockchain name (e.g. 'bitcoin', 'ethereum'), each containing an array of time-stamped entries with a USD volume figure. Each entry has a 'usd' field (float) and a 'time' field (ISO 8601 timestamp), representing daily aggregated transaction volume for the queried entity on that chain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chains": {
   "anyOf": [
    {
     "type": "string"
    },
    {
     "type": "number"
    },
    {
     "type": "boolean"
    },
    {
     "type": "array",
     "items": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "number"
       },
       {
        "type": "boolean"
       }
      ]
     }
    }
   ],
   "description": "Chains to filter by, as a single comma-separated value (e.g. 'ethereum,bitcoin'). If omitted, returns data across all s…"
  },
  "entity": {
   "anyOf": [
    {
     "type": "string"
    },
    {
     "type": "number"
    },
    {
     "type": "boolean"
    },
    {
     "type": "array",
     "items": {
      "anyOf": [
       {
        "type": "string"
       },
       {
        "type": "number"
       },
       {
        "type": "boolean"
       }
      ]
     }
    }
   ],
   "description": "The entity ID to query historical data for."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "bitcoin": [
   {
    "usd": 19480915256.37,
    "time": "2022-01-22T00:00:00Z"
   },
   {
    "usd": 18645267553.47,
    "time": "2022-01-23T00:00:00Z"
   }
  ],
  "ethereum": [
   {
    "usd": 51606841219.03,
    "time": "2021-12-31T00:00:00Z"
   },
   {
    "usd": 51120113947.47,
    "time": "2022-01-01T00:00:00Z"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arkham-entity-transaction-history-bbda4737/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)