# Bitcoin Coinbase ScriptSig Messages API

> Bitcoin Coinbase ScriptSig Messages API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns curated, printable-ASCII coinbase scriptSig messages from the Bitcoin blockchain, including pool tags, BIP comment campaigns, and political statements, within a configurable window up to 7 days.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/btc-derivatives/coinbase-messages
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-558ffd9d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DBLbKvIJG6LRVeNlBUyaV

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 api-carbon-cashmere-de-558ffd9d
```

Example prompt: Pull the Bitcoin coinbase scriptSig messages from the last 7 days — I want to see pool tags, any BIP comment campaigns, and political statements miners have embedded in blocks, for a protocol journalism piece.

## When to prefer this

Choose this endpoint when you need human-readable, curated coinbase scriptSig messages specifically (pool tags, BIP campaigns, political statements) sourced from a dedicated full-node parser with printable-ASCII filtering. Prefer it over raw blockchain explorers when you want pre-filtered, research-ready message data without having to parse raw binary scriptSig fields yourself.

## Known failure modes

- Window exceeds 7-day maximum — returns error or truncated result
- No messages found in the requested window — returns empty list
- Node sync lag may cause very recent blocks to be missing
- Non-printable ASCII messages are filtered out and will not appear
- Rate limiting or payment failure via x402 protocol

## How this service works

Curated Bitcoin coinbase scriptSig messages (printable ASCII only). Pool tags, BIP-comment campaigns, political statements. Window up to 7d.

## Output

A curated list of printable ASCII coinbase scriptSig messages from Bitcoin blocks within the requested time window (up to 7 days), categorized by type: mining pool tags, BIP comment/campaign messages, and political statements. Each entry includes the message text and associated block metadata, parsed from the provider's own Bitcoin full node.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 144,
  "window": "24h",
  "messages": [
   {
    "miner": "MARA Pool",
    "height": 949815,
    "message": "/MARA Pool/Made in USA/.."
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-558ffd9d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)