FETCH402
← Protocol index

Resource / 78

healthy

Kronos Crypto Data & Forecasts.

GET https://kronossignals.com/api/v1/price/btc ↗

Multi-source volume-weighted median (VWM) spot price for 16 crypto assets (BTC/ETH/SOL/BNB/XRP/DOGE/ADA/AVAX/LINK/DOT/LTC/TRX/BCH/ATOM/NEAR/APT). Aggregates Binance, Coinbase, Kraken, and OKX in parallel (2 s timeout per source). Includes 1% outlier rejection, cross-exchange spread %, confidence grading (high/medium/low), and per-source USD volume weights. Kaiko-style reference pricing — $0.02/call.

Eligibility
probeable
Failures
0
Last quote
2026-08-12 21:30:01 UTC
Last probe
2026-08-12 21:30:01 UTC
Payment requirements / accepts[] 1 options
State Network Scheme Atomic amount Asset payTo / untrusted
active eip155:8453 exact 20000 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 0x36038e1d712c5e39f35952164ec58ec2b96caee7

All advertised payment options are stored. Base (`eip155:8453`) is the operational network for ranking and canaries; non-Base options remain visible for transparency.

Probe evidence 1 recent
healthy 2026-08-12 21:30:01 UTC GET · HTTP 402 · 82ms · accepts 1 · base 1 ok
Request
GET https://kronossignals.com/api/v1/price/btc
Robots
error
Note
robots_error:{:robots_http_status, 404};http_402;accepts=1;base=1
Accepts fingerprint
31fe82a45a74fa7394aba976f58e8e6a26938a19d4574e4d65f5b2186c13bcec

Accepts snapshot

[
  {
    "amount": "20000",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "assetTransferMethod": null,
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "maxTimeoutSeconds": 300,
    "network": "eip155:8453",
    "payTo": "0x36038e1d712c5e39f35952164ec58ec2b96caee7",
    "paymentFlow": null,
    "raw": {
      "amount": "20000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "max_timeout_seconds": 300,
      "network": "eip155:8453",
      "payTo": "0x36038e1d712c5e39f35952164ec58ec2b96caee7",
      "pay_to": "0x36038e1d712c5e39f35952164ec58ec2b96caee7",
      "scheme": "exact"
    },
    "scheme": "exact"
  }
]

PaymentRequired raw 

{
  "accepts": [
    {
      "amount": "20000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "network": "eip155:8453",
      "payTo": "0x36038e1d712c5e39f35952164ec58ec2b96caee7",
      "scheme": "exact"
    }
  ],
  "error": "Payment required",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "pathParams": {},
          "queryParams": {},
          "type": "http"
        },
        "output": {
          "example": {
            "as_of": "2026-07-02T10:00:00.000Z",
            "asset": "BTC-USD",
            "confidence": "high",
            "cross_exchange_spread_pct": 0.08,
            "data_age_seconds": 0,
            "disclaimer": "Volume-weighted median price from up to 4 exchanges. Informational only, not financial advice.",
            "outliers_rejected": 0,
            "price": 107500,
            "price_simple_median": 107480,
            "sources": [
              {
                "exchange": "binance",
                "included": true,
                "price": 107510,
                "vol_weight": 0.45,
                "volume": 1200000000
              },
              {
                "exchange": "coinbase",
                "included": true,
                "price": 107490,
                "vol_weight": 0.3,
                "volume": 800000000
              },
              {
                "exchange": "kraken",
                "included": true,
                "price": 107500,
                "vol_weight": 0.15,
                "volume": 400000000
              },
              {
                "exchange": "okx",
                "included": true,
                "price": 107480,
                "vol_weight": 0.1,
                "volume": 270000000
              }
            ]
          },
          "type": "json"
        }
      },
      "routeTemplate": ":var1",
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "pathParams": {
                "type": "object"
              },
              "queryParams": {
                "properties": {},
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "description": "Multi-source volume-weighted median (VWM) spot price for 16 crypto assets (BTC/ETH/SOL/BNB/XRP/DOGE/ADA/AVAX/LINK/DOT/LTC/TRX/BCH/ATOM/NEAR/APT). Aggregates Binance, Coinbase, Kraken, and OKX in parallel (2 s timeout per source). Includes 1% outlier rejection, cross-exchange spread %, confidence grading (high/medium/low), and per-source USD volume weights. Kaiko-style reference pricing — $0.02/call.",
    "mimeType": "application/json",
    "serviceName": "Kronos Crypto Data & Forecasts",
    "tags": [
      "bitcoin",
      "btc",
      "ethereum",
      "solana",
      "crypto",
      "spot-price",
      "price",
      "multi-source",
      "volume-weighted-median",
      "cross-exchange",
      "reference-price",
      "outlier-rejection",
      "binance",
      "coinbase",
      "kraken",
      "okx",
      "ticker",
      "ai-agents",
      "x402"
    ],
    "url": "https://kronossignals.com/api/v1/price/btc"
  },
  "x402Version": 2
}

Response headers

{
  "age": "0",
  "cache-control": "public, max-age=0, must-revalidate",
  "content-type": "application/json",
  "date": "Wed, 12 Aug 2026 21:30:01 GMT",
  "payment-required": "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",
  "server": "Vercel",
  "strict-transport-security": "max-age=63072000",
  "transfer-encoding": "chunked",
  "x-matched-path": "/api/v1/price/[asset]",
  "x-vercel-cache": "MISS",
  "x-vercel-id": "iad1::iad1::4nztm-1786570201915-0675d548c954"
}

Response body 

{
  "accepts": [
    {
      "amount": "20000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "network": "eip155:8453",
      "payTo": "0x36038e1d712c5e39f35952164ec58ec2b96caee7",
      "scheme": "exact"
    }
  ],
  "error": "Payment required",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "pathParams": {},
          "queryParams": {},
          "type": "http"
        },
        "output": {
          "example": {
            "as_of": "2026-07-02T10:00:00.000Z",
            "asset": "BTC-USD",
            "confidence": "high",
            "cross_exchange_spread_pct": 0.08,
            "data_age_seconds": 0,
            "disclaimer": "Volume-weighted median price from up to 4 exchanges. Informational only, not financial advice.",
            "outliers_rejected": 0,
            "price": 107500,
            "price_simple_median": 107480,
            "sources": [
              {
                "exchange": "binance",
                "included": true,
                "price": 107510,
                "vol_weight": 0.45,
                "volume": 1200000000
              },
              {
                "exchange": "coinbase",
                "included": true,
                "price": 107490,
                "vol_weight": 0.3,
                "volume": 800000000
              },
              {
                "exchange": "kraken",
                "included": true,
                "price": 107500,
                "vol_weight": 0.15,
                "volume": 400000000
              },
              {
                "exchange": "okx",
                "included": true,
                "price": 107480,
                "vol_weight": 0.1,
                "volume": 270000000
              }
            ]
          },
          "type": "json"
        }
      },
      "routeTemplate": ":var1",
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "pathParams": {
                "type": "object"
              },
              "queryParams": {
                "properties": {},
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "description": "Multi-source volume-weighted median (VWM) spot price for 16 crypto assets (BTC/ETH/SOL/BNB/XRP/DOGE/ADA/AVAX/LINK/DOT/LTC/TRX/BCH/ATOM/NEAR/APT). Aggregates Binance, Coinbase, Kraken, and OKX in parallel (2 s timeout per source). Includes 1% outlier rejection, cross-exchange spread %, confidence grading (high/medium/low), and per-source USD volume weights. Kaiko-style reference pricing — $0.02/call.",
    "mimeType": "application/json",
    "serviceName": "Kronos Crypto Data & Forecasts",
    "tags": [
      "bitcoin",
      "btc",
      "ethereum",
      "solana",
      "crypto",
      "spot-price",
      "price",
      "multi-source",
      "volume-weighted-median",
      "cross-exchange",
      "reference-price",
      "outlier-rejection",
      "binance",
      "coinbase",
      "kraken",
      "okx",
      "ticker",
      "ai-agents",
      "x402"
    ],
    "url": "https://kronossignals.com/api/v1/price/btc"
  },
  "x402Version": 2
}

Request headers

{
  "accept": "*/*",
  "user-agent": "Fetch402Bot/0.1 (+https://fetch402.com/crawler; contact: crawler@fetch402.com)"
}

Machine contract

Schemas.

InputJSON
{
  "method": "GET",
  "pathParams": {},
  "queryParams": {},
  "type": "http"
}
OutputJSON
{
  "example": {
    "as_of": "2026-07-02T10:00:00.000Z",
    "asset": "BTC-USD",
    "confidence": "high",
    "cross_exchange_spread_pct": 0.08,
    "data_age_seconds": 0,
    "disclaimer": "Volume-weighted median price from up to 4 exchanges. Informational only, not financial advice.",
    "outliers_rejected": 0,
    "price": 107500,
    "price_simple_median": 107480,
    "sources": [
      {
        "exchange": "binance",
        "included": true,
        "price": 107510,
        "vol_weight": 0.45,
        "volume": 1200000000
      },
      {
        "exchange": "coinbase",
        "included": true,
        "price": 107490,
        "vol_weight": 0.3,
        "volume": 800000000
      },
      {
        "exchange": "kraken",
        "included": true,
        "price": 107500,
        "vol_weight": 0.15,
        "volume": 400000000
      },
      {
        "exchange": "okx",
        "included": true,
        "price": 107480,
        "vol_weight": 0.1,
        "volume": 270000000
      }
    ]
  },
  "type": "json"
}