# Saylor Innovations Chord Chart Transposer

> Saylor Innovations Chord Chart Transposer is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Transposes a set of guitar/keyboard chords to a new key, returning correctly spelled chords, a mapping table, capo shapes, and key signature information

## Facts

- Endpoint: GET https://saylorinnovations.com/api/music/transpose?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-chord-chart-transposer-eabfeaf3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m_-im1iyTeoSszL48CcFM

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 saylor-innovations-chord-chart-transposer-eabfeaf3
```

Example prompt: Can you transpose the chords C G Am F to the key of E, using sharps where possible, and show me the capo shapes and chord mapping table?

## When to prefer this

Choose this endpoint when you need programmatic chord transposition with music-theory-correct spelling, capo suggestions, and a full mapping table — particularly useful for musicians, songwriting tools, and music education apps. It handles complex chord names like Em7, A7, Dmaj7 and supports flexible input delimiters, making it more robust than generic string-replacement approaches.

## Known failure modes

- Invalid or unrecognized chord names in the input return an error
- More than 64 chords in the input exceeds the limit and is rejected
- Conflicting parameters (e.g. both semitones and to_key specified ambiguously) may return unexpected results
- Unsupported key names or accidental preferences may cause a 400-level error
- Network or payment (x402) failures result in no response

## How this service works

Transposed chords with correct spelling, mapping table, capo shapes and key signature

## Output

A JSON object containing the transposed chord names with correct enharmonic spelling, a mapping table pairing each original chord to its transposed equivalent, capo shape suggestions for guitar, and key signature information for the target key.

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chords"
     ],
     "properties": {
      "chords": {
       "type": "string",
       "description": "required chords separated by spaces, commas, dashes or | for example C G Am F or Em7|A7|Dmaj7 (max 64) (query)"
      },
      "prefer": {
       "type": "string",
       "description": "optional sharps, flats or auto (default) (query)"
      },
      "to_key": {
       "type": "string",
       "description": "optional target key (query)"
      },
      "from_key": {
       "type": "string",
       "description": "optional original key (with to_key) (query)"
      },
      "semitones": {
       "type": "string",
       "description": "optional shift in semitones, positive up (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object"
    },
    "description": {
     "type": "string"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-chord-chart-transposer-eabfeaf3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)