## Definition

Recall that the coin-age model allows us at each given point in time to assign age to each coin/token.

There are two coin age defined metrics:

• Mean Coin Age - The average age of all coins/tokens on the blockchain.
• Mean Dollar Invested Age - The average age of all coins/tokens on the blockchain weighted by the purchase price.

### Example (Mean Coin age)

Given there are 100 tokens in existence:

• 50 of them have age 10 days
• 50 of them have age 20 days

then the average coin age is: (10 × 50 + 20 × 50) / 100 = 15 (coin-days)

### Example (Mean Dollar Invested Age)

Given there 100 tokens in existence:

• 50 of them have age 10 days and the token's price was $1 at that time • 50 of them have age 20 days and the token's price was$2 at that time

then the mean dollar invested age is: (10 × 50 + 20 × 50) / (50 × $1 + 50 ×$2) = 1500 / 150 = 10 (coin-dollar days)

More technical definition and computation description can be found here

## Access

Restricted Access

## Measuring Unit

• Coin Age in Days
• Coin Dollar Age in Days

Timeseries Data

Daily Intervals

On-Chain Latency

## SanAPI

Available under the mean_age and mean_dollar_invested_age names.

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{
getMetric(metric: "mean_age") {
timeseriesData(
slug: "santiment"
from: "2020-01-13T00:00:00Z"
to: "2020-01-18T00:00:00Z"
interval: "1d"
) {
datetime
value
}
}
}

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{
getMetric(metric: "mean_dollar_invested_age") {
timeseriesData(
slug: "santiment"
from: "2020-01-13T00:00:00Z"
to: "2020-01-18T00:00:00Z"
interval: "1d"
) {
datetime
value
}
}
}

Run in Explorer