surf

Surf — Crypto Data via BlockRun

Surf (asksurf.ai) aggregates 83 crypto data endpoints across CEX market data, on-chain SQL (13 chains, 80+ ClickHouse tables), 100M+ labeled wallets, prediction markets (Polymarket + Kalshi side-by-side), social/CT intelligence, news and unified search.

BlockRun is Surf's x402 payment rail — every call settles directly to Surf's Base treasury. You hold the wallet, BlockRun holds the Surf key, Surf holds the data. No Surf account, no API key, no monthly minimum.

How to Call from MCP

One tool, three params. The MCP tool auto-routes method (POST when body is set, GET otherwise) and auto-validates required params before settling:

blockrun_surf({ path: "market/price", params: { symbol: "BTC" } })

blockrun_surf({ path: "onchain/sql", body: {
  sql: "SELECT token_address, count() FROM ethereum.dex_trades WHERE block_time > now() - INTERVAL 1 DAY GROUP BY 1 ORDER BY 2 DESC LIMIT 10"
}})

blockrun_surf({ path: "wallet/labels/batch", params: { addresses: "0xabc,0xdef" } })

Pricing — one flat rate

$0.0085 per call. Every endpoint, no tiers, including raw on-chain SQL.

Verified against the gateway's own payment-required header, which is free to request — send any call with no payment header and it quotes the exact charge. All of market/price, wallet/labels/batch, social/mindshare, news/feed, exchange/klines, search/web and onchain/sql return the same $0.0085 (SURF_TIER_1/2/3_PRICE are all identical upstream).

Ignore any "premium tier" pricing you may have seen — SQL used to cost more and no longer does.

Wrong / missing required params return HTTP 400 without charging — pre-validation runs before settlement.

Do NOT use Surf for prediction markets

Surf carries 17 prediction-market/* endpoints (Polymarket + Kalshi). Use blockrun_markets (Predexon) instead — same data, same price, and far deeper.

Predexon used to be 7.5× cheaper; since 2026-07-15 both bill the same flat rate, so the choice is now purely about coverage — and Predexon still wins on coverage by a wide margin.