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Underground Cultural District Catalog
x402
Underground Cultural District Catalog is a paid API for AI agents from underground.substratesymposium.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns the full catalog of 228 themed digital products (poetry, philosophy, fiction, reflections, plant meditations) with slugs, descriptions, prices, and x402 purchase endpoints
Price / call$0.01
Success—
StatusUnknown
How this service works
Underground Cultural District — catalog of 228 themed digital products (poetry, philosophy, fiction, reflection, plant meditations). One settle returns the full menu with every product's slug, description, price, and x402 endpoint. Each individual product is its own indexable x402 route. The catalog is the doorway.
Output
A full catalog listing of all 228 themed digital products, each with its slug, description, price (in USDC), and the individual x402 endpoint URL to purchase that specific product
Example use cases
Example prompt
“Show me the full catalog of digital products available in the Underground Cultural District — I want to see all the poetry, philosophy, fiction, and plant meditations with their prices and how to buy each one.”
Technical details
Endpoint
GEThttps://underground.substratesymposium.com/buy/catalogWhen to prefer
Use this endpoint when you need to discover what digital content products are available for purchase before buying individual items — it serves as the single entry point to find all 228 products and their individual x402 purchase routes, making it the required first step for any browsing or purchasing workflow on this platform
Side effects
- 402 Payment Required if the $0.01 USDC payment is not settled before the request
- Network or server errors returning 5xx if the catalog service is unavailable
- Truncated or partial catalog response if the response is too large (catalog is ~10KB+)
- Empty or stale catalog if products have been removed or the index has not been updated
Input
{
"query": "{\\\"input\\\": {\\\"type\\\": \\\"http\\\", \\\"method\\\": \\\"GET\\\", \\\"queryParams\\\": {}}}"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"_truncated": true,
"_originalSize": 10247
}Tags
x402
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