# Blockchain.com Explorer — Unique Addresses Chart

> Blockchain.com Explorer — Unique Addresses Chart is a paid API for AI agents from api.blockchain.info, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Returns historical chart data for the number of unique Bitcoin addresses used per day over a specified time period

## Facts

- Endpoint: POST https://api.blockchain.info/explorer-gateway-kt/x402/charts/n-unique-addresses?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockchain-com-explorer-unique-addresses-chart-839d9602
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q7N3RQKGEyutVY-F2BSUc

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 blockchain-com-explorer-unique-addresses-chart-839d9602 -d '<json body>'
```

Example prompt: Pull the Blockchain.com unique Bitcoin addresses chart for the last 3 years in JSON format with a 24-hour rolling average so I can analyze long-term adoption trends.

## When to prefer this

Choose this endpoint when you need official Blockchain.com data on unique Bitcoin address activity over time, especially for adoption trend analysis, network growth charting, or on-chain analytics dashboards. Prefer it over generic crypto data APIs when you specifically want Blockchain.com's explorer-grade, paid-grade reliable data with flexible timespan and rolling average options.

## Known failure modes

- Invalid timespan format returns an error or empty dataset
- Unsupported format value (not 'json' or 'csv') causes a 400 error
- Payment failure via x402 protocol results in 402 Payment Required
- Network timeout for very large timespans with sampling disabled
- Empty result if the rolling average window exceeds the requested timespan

## How this service works

Paid AI-agent access to Blockchain.com Explorer API

## Output

Returns a time-series dataset of unique Bitcoin address counts, with timestamps and values, optionally smoothed by a rolling average window. In JSON mode includes structured metadata; in CSV mode returns raw two-column data (timestamp, value). Data may be sampled to reduce volume.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "cors": {
   "type": "boolean",
   "default": false,
   "description": "Enable CORS headers"
  },
  "format": {
   "enum": [
    "json",
    "csv"
   ],
   "type": "string",
   "default": "json",
   "description": "Response format:\n- `json` — Returns structured JSON with metadata and values\n- `csv` — Returns raw CSV data with timestamp and value columns (no metadata)\n"
  },
  "sampled": {
   "type": "boolean",
   "default": true,
   "description": "Apply sampling to reduce data points"
  },
  "metadata": {
   "type": "boolean",
   "default": false,
   "description": "Include metadata in response"
  },
  "timespan": {
   "type": "string",
   "default": "1y",
   "example": "1y",
   "description": "Time period (e.g., \"24h\", \"7d\", \"1y\", \"3y\")"
  },
  "rollingAverage": {
   "type": "string",
   "default": "8h",
   "example": "8h",
   "description": "Rolling average window (e.g., \"8h\", \"24h\")"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "format": "application/json",
 "example": {
  "name": "Number Of Unique Addresses Used",
  "unit": "Unique Addresses",
  "period": "day",
  "status": "ok",
  "values": [
   {
    "x": 1704067200,
    "y": 612345
   },
   {
    "x": 1704153600,
    "y": 628104
   }
  ],
  "description": "The total number of unique addresses used on the Bitcoin blockchain."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockchain-com-explorer-unique-addresses-chart-839d9602/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockchain.info](https://www.zero.xyz/host/api.blockchain.info/llms.txt)