# PennyPress – The Last Witness Audio (MP3)

> PennyPress – The Last Witness Audio (MP3) is a paid API for AI agents from www.pennypress.org, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-27).

Returns a spoken-word MP3 audio recording of the essay 'The Last Witness' from PennyPress, delivered after a micropayment.

## Facts

- Endpoint: GET https://www.pennypress.org/essays/the-last-witness/audio?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennypress-the-last-witness-audio-mp3-cfa0009f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OVN6AQcO2oxkEc9klzk6p

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 pennypress-the-last-witness-audio-mp3-cfa0009f
```

Example prompt: Can you get me the audio version of 'The Last Witness' from PennyPress so I can listen to it as an MP3?

## When to prefer this

Choose this endpoint when you specifically want to listen to 'The Last Witness' essay in audio/MP3 format from PennyPress, especially when reading is inconvenient or when building a library of spoken-word independent journalism. It is appropriate for low-cost per-access micropayment workflows via x402 where you only pay when you actually retrieve the content.

## Known failure modes

- Payment not authorized or insufficient funds — content not delivered
- Network timeout during audio file retrieval
- Invalid or missing payment header — 402 Payment Required response
- Content temporarily unavailable — server-side issue
- Unsupported HTTP method used (only GET/HEAD/DELETE accepted)

## How this service works

Spoken edition of The Last Witness as MP3.

## Output

A spoken-word MP3 audio file of the essay 'The Last Witness', delivered after successful micropayment processing. The response includes the audio content along with metadata such as title, format, description, and publication details.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "title",
      "format",
      "content"
     ],
     "properties": {
      "slug": {
       "type": "string"
      },
      "type": {
       "type": "string"
      },
      "price": {
       "type": "string"
      },
      "title": {
       "type": "string"
      },
      "format": {
       "type": "string"
      },
      "content": {
       "type": "string",
       "description": "Spoken MP3 audio, delivered after payment."
      },
      "description": {
       "type": "string"
      },
      "publication": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennypress-the-last-witness-audio-mp3-cfa0009f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.pennypress.org](https://www.zero.xyz/host/www.pennypress.org/llms.txt)