One BTC price from four exchanges, 0.002 USDC, no account.

A single HTTP GET returns BTC (or ETH, SOL, anything listed on a major exchange) as Binance, Coinbase, Kraken and Bybit quote it right now: last, bid, ask, each venue's own spread, its 24h change, plus the cross-venue spread in basis points and which venue has the best bid and the best ask. The number a router or an arbitrage check needs, and no single-exchange feed can give.

What it costs against the market

The x402 Bazaar moved 1,177,274 paid calls in 30 days. Single-asset spot quotes are 38.4% of them: 351,954 calls across 1,360 resources (234 with three or more distinct payers), a median price of 0.010 USDC. That is 258.8 calls per resource, the highest demand-to-supply ratio of any segment on the board. This endpoint is 0.002 USDC: one fifth of the segment median, with the cross-venue comparison a single-venue feed does not carry.

Measured from the complete CDP Bazaar index, 34,880 resources, 1,177,274 paid calls over 30 days (2026-11-14). Segment table: evidence/x402-marketdata-depth-2026-11-14/segments.out.

How to buy it

You need one thing: USDC on Base. No account, no API key, no signup, no invoice. Send a GET without payment and you get an HTTP 402 with the exact terms:

GET https://cian-x402.netlify.app/v1/market-snapshot?symbol=BTC

HTTP/2 402
payment-required: (base64 JSON)
  scheme:  exact
  network: eip155:8453            (Base mainnet)
  asset:   0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913   (USDC, 6 decimals)
  amount:  2000                    (0.002 USDC)
  payTo:   0x7373E88368378052EB5a449d2eBC95aD7E5f2bEF
  resource: https://cian-x402.netlify.app/v1/market-snapshot

Sign the authorization with any x402 client, retry with PAYMENT-SIGNATURE, and the same GET returns the JSON below. The wire format is the x402 v2 standard; @coinbase/x402, x402-fetch and the reference clients all work as-is.

A live response, from this endpoint's own code path

Captured 2026-11-14T06:40:36+00:00 by running this route's handler (market.snapshot("BTC")) against the live upstreams. It is the exact body a paid 200 returns; only the timestamps move.

Cross-venue mean 67,284.54 · spread 10.42 bps · best bid binance · best ask kraken · venues ok 4, errored 0

{
 "base_symbol": "BTC",
 "as_of": "2026-11-14T06:40:36+00:00",
 "venues": {
  "binance": {
   "venue": "binance",
   "symbol": "BTCUSDT",
   "last": 67320.2,
   "bid": 67320.19,
   "ask": 67320.2,
   "venue_spread_bps": 0.0,
   "change_24h_pct": -2.339,
   "open_24h": 68932.54,
   "high_24h": 70214.31,
   "low_24h": 66456.0,
   "volume_24h_base": 23064.8281,
   "quote_volume_24h": 1577573060.8524692
  },
  "coinbase": {
   "venue": "coinbase",
   "symbol": "BTC-USD",
   "last": 67252.65,
   "bid": 67252.65,
   "ask": 67252.66,
   "venue_spread_bps": 0.0,
   "change_24h_pct": -2.5372,
   "open_24h": 69003.4,
   "high_24h": 70141.87,
   "low_24h": 66369.12,
   "volume_24h_base": 14079.32235113,
   "quote_volume_24h": null
  },
  "kraken": {
   "venue": "kraken",
   "symbol": "XBT/USD",
   "last": 67250.1,
   "bid": 67250.1,
   "ask": 67250.2,
   "venue_spread_bps": 0.01,
   "change_24h_pct": -1.4469,
   "open_24h": 68237.4,
   "high_24h": 68369.7,
   "low_24h": 66402.4,
   "volume_24h_base": 3959.36864027,
   "quote_volume_24h": null
  },
  "bybit": {
   "venue": "bybit",
   "symbol": "BTCUSDT",
   "last": 67315.2,
   "bid": 67315.1,
   "ask": 67315.2,
   "venue_spread_bps": 0.01,
   "change_24h_pct": -2.3,
   "open_24h": 68899.89764585465,
   "high_24h": 70217.2,
   "low_24h": 66448.6,
   "volume_24h_base": 14208.269481,
   "quote_volume_24h": 972206401.3605062
  }
 },
 "summary": {
  "venues_ok": 4,
  "venues_errored": 0,
  "mean_last": 67284.5375,
  "cross_venue_spread_bps": 10.42,
  "high_venue": "binance",
  "high_last": 67320.2,
  "low_venue": "kraken",
  "low_last": 67250.1,
  "best_bid_venue": "binance",
  "best_bid": 67320.19,
  "best_ask_venue": "kraken",
  "best_ask": 67250.2
 },
 "anomaly_count": 0,
 "anomalies": []
}

Everything on this server

The catalogue and schema are machine-readable at /.well-known/x402, /openapi.json and /llms.txt.