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Blockchain.info UTXO Count Chart API
x402
Blockchain.info UTXO Count Chart API 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 UTXO (Unspent Transaction Output) count data for the Bitcoin blockchain over a configurable time period
Price / call$0.001
Success—
StatusUnknown
How this service works
Paid AI-agent access to Blockchain.com Explorer API
Output
Returns a time-series dataset of Bitcoin UTXO counts, either as structured JSON (with optional metadata including chart description, units, and period) or raw CSV with timestamp and value columns. Data points reflect the number of unspent transaction outputs on the Bitcoin blockchain over the requested timespan, optionally smoothed by a rolling average window.
Example use cases
Bitcoin network health dashboard
“Pull the Bitcoin UTXO count for the last 3 years from Blockchain.com Explorer with a 24-hour rolling average so I can chart long-term network growth trends.”
Crypto analyst UTXO spike investigation
“Get me the Bitcoin UTXO count data for the past 7 days from Blockchain.com, with no sampling so I can see every data point and investigate that recent spike.”
Automated on-chain metrics report
“Fetch the Bitcoin UTXO count for the past year from Blockchain.com in CSV format with metadata included so I can drop it straight into my weekly blockchain analytics report.”
Technical details
Endpoint
POSThttps://api.blockchain.info/explorer-gateway-kt/x402/charts/utxo-count?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative Bitcoin UTXO count time-series data sourced directly from Blockchain.com Explorer. Prefer it over generic crypto data APIs when you need flexible time windows, rolling average smoothing, and both JSON and CSV output formats for on-chain UTXO analytics. Best for agents doing Bitcoin network health monitoring, blockchain research, or automated reporting pipelines.
Side effects
- Invalid timespan format returns 400 error
- Invalid rollingAverage format returns 400 error
- Payment failure (insufficient USDC balance) returns 402 Payment Required
- Rate limiting may return 429 Too Many Requests
- Server-side data unavailability may return 503
- Requesting unsupported format enum value returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cors | boolean | Enable CORS headers |
| format | string | Response format: - `json` — Returns structured JSON with metadata and values - `csv` — Returns raw CSV data with timestamp and value columns (no metadata) |
| sampled | boolean | Apply sampling to reduce data points |
| metadata | boolean | Include metadata in response |
| timespan | string | Time period (e.g., "24h", "7d", "1y", "3y") |
| rollingAverage | string | Rolling average window (e.g., "8h", "24h") |
Output
Schema · Response
{
"type": "json",
"format": "application/json",
"example": {
"name": "Number of Unspent Transaction Outputs",
"unit": "Number of Outputs",
"period": "day",
"status": "ok",
"values": [
{
"x": 1704067200,
"y": 182341567
},
{
"x": 1704153600,
"y": 182618904
}
],
"description": "The number of unspent Bitcoin transactions outputs, also known as the UTXO set size."
}
}Tags
x402
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