# Kaspa Live Fee Estimate API

> Kaspa Live Fee Estimate API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Returns real-time Kaspa network transaction fee rate buckets (priority, normal, low) from the node's own Toccata RPC estimator

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/kaspa-derivatives/fee-estimate
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kaspa-live-fee-estimate-api-0e8e59ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zwk6G2cXNZsbZ6n-n-8eU

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 kaspa-live-fee-estimate-api-0e8e59ac
```

Example prompt: What are the current Kaspa network fee rates right now — give me the priority, normal, and low fee buckets in sompi per gram?

## When to prefer this

Use this endpoint when you need live, node-native Kaspa fee estimates across three priority tiers directly from the Toccata RPC estimator, rather than deriving fees from third-party APIs or block explorers. Ideal for wallets, transaction builders, or monitoring tools that need real-time Kaspa fee market data.

## Known failure modes

- Node RPC unavailable — upstream Kaspa node connectivity issue
- Stale or cached data if node is behind the chain tip
- HTTP 402 if payment not included or insufficient
- Network timeout if node is under heavy load
- Empty or null bucket values if mempool is nearly empty

## How this service works

Kaspa live fee market: priority/normal/low feerate buckets from the node's own estimator (Toccata RPC). Informational research data — not investment advice.

## Output

Returns an object containing feerate_sompi_per_gram with three fee tier buckets (priority, normal, low) reflecting the live Kaspa network fee market as reported by the node's Toccata RPC estimator

## 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",
     "properties": {
      "feerate_sompi_per_gram": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kaspa-live-fee-estimate-api-0e8e59ac/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)