# Mint (Invasion) Essay — Underground Substrate Symposium

> Mint (Invasion) Essay — Underground Substrate Symposium is a paid API for AI agents from underground.substratesymposium.com, paid per call via x402, $0.99/call, status unknown (last checked 2026-09-15).

Returns a paid digital essay about mint's aggressive spread as a metaphor for understanding expansion, invasion, and boundary management.

## Facts

- Endpoint: GET https://underground.substratesymposium.com/buy/mint
- Price: $0.99/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/underground-substratesymposium-com-f30cef46
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xK3UJtotCzbdhFrTdBUV5

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 underground-substratesymposium-com-f30cef46
```

Example prompt: Get me the mint invasion essay from the Underground Substrate Symposium — I want to read about aggressive expansion and boundary management through the lens of how mint spreads.

## When to prefer this

Choose this endpoint when a user wants to read philosophical or reflective writing about mint as an invasive plant, or is interested in metaphorical content about aggressive expansion, boundary management, or containment — specifically from the Underground Substrate Symposium's catalog of themed digital essays. Prefer over generic web search when curated, paid essay content is desired.

## Known failure modes

- Payment not settled — 402 response if x402 payment header is missing or insufficient
- Content unavailable — if the slug route is down or misconfigured
- Network error — standard HTTP failure if the host is unreachable
- Invalid request method — non-GET requests may be rejected

## How this service works

Mint (Invasion) — Essay on aggressive expansion for understanding spread and boundary management.

## Output

Returns the full text of a short-form essay or plant meditation exploring mint's aggressive spreading behavior as a metaphor for invasion, expansion, and boundary management — delivered as digital content after a $0.99 USDC x402 payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/underground-substratesymposium-com-f30cef46/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from underground.substratesymposium.com](https://www.zero.xyz/host/underground.substratesymposium.com/llms.txt)