# Crypto Dominance Data (BTC, ETH, USDT Market Share)

> Crypto Dominance Data (BTC, ETH, USDT Market Share) is a paid API for AI agents from crypto-asistent.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-13).

Returns BTC, ETH, and USDT dominance as a percentage of total crypto market cap, serving as a regime filter for altcoin positioning and risk-on/risk-off signals.

## Facts

- Endpoint: POST https://crypto-asistent.com/api/x402/data/dominance?utm_source=zero.xyz
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-dominance-data-btc-eth-usdt-market-share-947c90ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Bkypa0IcVCcv_ctnKEQQp

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 crypto-dominance-data-btc-eth-usdt-market-share-947c90ee -d '<json body>'
```

Example prompt: What are the current BTC, ETH, and USDT dominance percentages, and what does the dominance picture tell me about whether it's safe to size into altcoin positions right now?

## When to prefer this

Use this endpoint when you need a quick regime filter before sizing altcoin positions, or when monitoring whether capital is rotating between BTC, ETH, and stablecoins. Prefer this over raw market cap endpoints when you specifically need dominance percentages as a decision input. It is the dedicated dominance signal layer of the crypto-asistent.com suite, complementing their Fear & Greed, TVL, and macro market endpoints.

## Known failure modes

- Payment not processed or insufficient USDC balance — endpoint returns 402 Payment Required
- Upstream data source unavailable — may return stale or null dominance values
- Malformed POST body — returns 400 with schema validation error
- Network timeout from crypto-asistent.com — returns 504 or connection error

## How this service works

BTC, ETH and USDT dominance as a share of total crypto market cap — the regime filter to check before sizing any altcoin position. Rising BTC dominance means capital rotating to relative safety; rising USDT dominance means capital leaving for stablecoins, a broader risk-off. Falling BTC dominance with rising ETH dominance is the classic rotation signal.

## Output

Returns BTC dominance, ETH dominance, and USDT dominance as percentages of total crypto market capitalization, along with contextual signals indicating whether the market is in a risk-on, risk-off, or rotation regime — helping the agent decide whether conditions are favorable for altcoin exposure.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [],
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    }
   },
   "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/crypto-dominance-data-btc-eth-usdt-market-share-947c90ee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from crypto-asistent.com](https://www.zero.xyz/host/crypto-asistent.com/llms.txt)