# Track PSA population changes for a card watchlist

**Use case:** 

Track total, PSA 10 and PSA 9 population changes between runs. This one-card Surging Sparks example establishes a baseline first; repeat the same watchlist for dated comparisons. Select your own spec IDs, then schedule daily or weekly. Each returned card is billed, including unchanged cards.

## Input

```json
{
  "setName": "Surging Sparks",
  "setUrl": "https://www.psacard.com/pop/tcg-cards/2024/pokemon-ssp-en-surging-sparks/285178",
  "trackPopulationChanges": true,
  "watchlistName": "surging-sparks-watchlist",
  "watchSpecIds": [
    12168745
  ]
}
```

## Output

```json
{
  "cardNumber": {
    "label": "#",
    "format": "text"
  },
  "subject": {
    "label": "Card Name",
    "format": "text"
  },
  "variety": {
    "label": "Variety",
    "format": "text"
  },
  "setName": {
    "label": "Set",
    "format": "text"
  },
  "year": {
    "label": "Year",
    "format": "text"
  },
  "psaPop.total": {
    "label": "Total Pop",
    "format": "number"
  },
  "psaPop.grade10": {
    "label": "PSA 10",
    "format": "number"
  },
  "psaPop.grade9": {
    "label": "PSA 9",
    "format": "number"
  },
  "psaPop.grade8": {
    "label": "PSA 8",
    "format": "number"
  },
  "psaPop.auth": {
    "label": "Authentic",
    "format": "number"
  },
  "populationType": {
    "label": "Population type",
    "format": "text"
  },
  "psaDnaPop.total": {
    "label": "PSA/DNA total",
    "format": "number"
  },
  "psaDnaPop.grade10": {
    "label": "PSA/DNA 10",
    "format": "number"
  },
  "psaDnaPop.grade9": {
    "label": "PSA/DNA 9",
    "format": "number"
  },
  "halfGradeTotal": {
    "label": "Half Grades",
    "format": "number"
  },
  "specID": {
    "label": "Spec ID",
    "format": "number"
  },
  "populationChangeStatus": {
    "label": "Change status",
    "format": "text"
  },
  "deltaTotal": {
    "label": "Population change",
    "format": "number"
  },
  "deltaGrade10": {
    "label": "PSA 10 change",
    "format": "number"
  },
  "deltaGrade9": {
    "label": "PSA 9 change",
    "format": "number"
  },
  "gemRatePct": {
    "label": "PSA 10 share (%)",
    "format": "number"
  },
  "gemRateChangePp": {
    "label": "Share change (pp)",
    "format": "number"
  },
  "baselineAt": {
    "label": "Baseline time",
    "format": "date"
  },
  "observedAt": {
    "label": "Observed time",
    "format": "date"
  }
}
```

## About this Actor

This example demonstrates how to use [PSA Population Report Lookup & Change Tracker](https://apify.com/lulzasaur/psa-pop-scraper.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/lulzasaur/psa-pop-scraper.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/lulzasaur/psa-pop-scraper.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).