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:

ts
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.

| | Predexon (blockrun_markets) | Surf | |---|---|---| | Polymarket / Kalshi markets | $0.0085 | $0.0085 (same) | | Wallet clustering, smart money, leaderboards | ✅ | ❌ none | | Limitless, Opinion, Predict.Fun, sports, UMA | ✅ | ❌ Polymarket + Kalshi only |

The only Surf prediction-market endpoint with no Predexon equivalent is prediction-market/category-metrics. Everything else is a strictly worse buy. See skills/prediction-markets/SKILL.md.

Reach for Surf when Predexon cannot answer it: on-chain SQL, 100M+ wallet labels across 13 chains, 16 CEXs, social/CT intelligence, news, tokenomics/unlocks, liquidations, ETF flows, VC portfolios. Predexon has none of those.

Quick Decision Table — "User asks about X"

| User wants… | Method | Path | Required | |---|---|---|---| | BTC/ETH price | GET | market/price | symbol | | ETF flow history | GET | market/etf | symbol | | Fear & Greed index | GET | market/fear-greed | – | | Top 100 tokens by market cap | GET | market/ranking | – | | Options skew / IV / volume | GET | market/options | symbol | | CEX ticker for a pair | GET | exchange/price | pair | | Perp snapshot (funding + OI) | GET | exchange/perp | pair | | Order book depth | GET | exchange/depth | pair | | OHLCV candles | GET | exchange/klines | pair | | Funding rate history | GET | exchange/funding-history | pair | | Long/short ratio | GET | exchange/long-short-ratio | pair | | Bridge protocols by volume | GET | onchain/bridge/ranking | – | | Yield pool ranking | GET | onchain/yield/ranking | – | | Current gas price (per chain) | GET | onchain/gas-price | chain | | Transaction details | GET | onchain/tx | hash, chain | | Raw on-chain SQL | POST | onchain/sql | body: sql | | Structured on-chain query | POST | onchain/query | body: typed predicates | | Inspect ClickHouse schema | GET | onchain/schema | – | | Polymarket markets ranking | GET | prediction-market/polymarket/ranking | – | | Polymarket price history | GET | prediction-market/polymarket/prices | condition_id | | Polymarket positions for wallet | GET | prediction-market/polymarket/positions | address | | Kalshi markets ranking | GET | prediction-market/kalshi/ranking | – | | Kalshi market detail | GET | prediction-market/kalshi/markets | market_ticker | | Search Polymarket / Kalshi | GET | search/polymarket / search/kalshi | – | | Wallet profile (cross-chain) | GET | wallet/detail | address | | Wallet net-worth time series | GET | wallet/net-worth | address | | Wallet DeFi positions | GET | wallet/protocols | address | | Batch wallet labels (CEX/Whale/MEV…) | GET | wallet/labels/batch | addresses | | Token tokenomics + unlocks | GET | token/tokenomics | – | | Token holders top N | GET | token/holders | address, chain | | Token transfers | GET | token/transfers | address, chain | | Token DEX trades | GET | token/dex-trades | address | | Social mindshare time series | GET | social/mindshare | q, interval | | Smart-follower history | GET | social/smart-followers/history | – | | Twitter user profile | GET | social/user | handle | | Twitter user posts | GET | social/user/posts | handle | | Tweet replies | GET | social/tweet/replies | tweet_id | | Web search (crypto-scoped) | GET | search/web | q | | News article search | GET | search/news | q | | KOL / CT people search | GET | search/social/people | q | | Tweet full-text search | GET | search/social/posts | q | | Project / token search | GET | search/project | q | | Wallet search (by ENS, label) | GET | search/wallet | q | | VC fund portfolio | GET | fund/portfolio | – | | VC fund ranking | GET | fund/ranking | metric | | DeFi protocol ranking | GET | project/defi/ranking | metric | | Project full profile | GET | project/detail | – | | Clean a webpage to markdown | GET | web/fetch | url | | News feed | GET | news/feed | – | | Single news article | GET | news/detail | id |

Worked Examples

1. "What's BTC trading at?"

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

Cost: $0.0085. Returns price history; latest point = current price.

2. "Top 10 tokens by DEX volume on Ethereum in the last 24h"

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

Cost: $0.0085. Raw ClickHouse — same query language Surf's own UI uses, at the same flat rate as any other Surf read.

3. "Is this whale wallet labeled? What does it hold?"

ts
// Step 1 — labels (CEX / Whale / Bridge / MEV / Bot / Fund)
blockrun_surf({ path: "wallet/labels/batch", params: { addresses: "0xabc...,0xdef..." } })

// Step 2 — cross-chain holdings + DeFi positions
blockrun_surf({ path: "wallet/detail", params: { address: "0xabc..." } })
blockrun_surf({ path: "wallet/protocols", params: { address: "0xabc..." } })

// Step 3 — net-worth time series
blockrun_surf({ path: "wallet/net-worth", params: { address: "0xabc..." } })

Cost: 4 × $0.0085 = $0.034. Replaces a Nansen subscription for one-off lookups.

4. "What's the market saying about the 2028 election?"

ts
// Compare Polymarket + Kalshi side by side
blockrun_surf({ path: "search/polymarket", params: { q: "2028 US president" } })
blockrun_surf({ path: "search/kalshi",     params: { q: "2028 US president" } })

// Then pull the order book on the leading market
blockrun_surf({ path: "prediction-market/polymarket/prices",
                params: { condition_id: "0x..." } })

5. "Where's mindshare moving for L1s?"

ts
blockrun_surf({ path: "social/mindshare", params: { q: "solana", interval: "1d" } })
blockrun_surf({ path: "social/mindshare", params: { q: "monad",  interval: "1d" } })
blockrun_surf({ path: "social/ranking" })

6. "ETF flows + funding rate + long/short — give me the macro picture"

ts
blockrun_surf({ path: "market/etf",                params: { symbol: "BTC" } })
blockrun_surf({ path: "market/fear-greed" })
blockrun_surf({ path: "exchange/funding-history",  params: { pair: "BTC-USDT" } })
blockrun_surf({ path: "exchange/long-short-ratio", params: { pair: "BTC-USDT" } })

Cost: 4 × $0.0085 = $0.034.

Method Routing — When to Use body

Pass body (POST) only for these three endpoints:

• onchain/query — structured, typed predicates against ClickHouse
• onchain/sql — raw SQL string in { sql: "..." }

Everything else is GET with params.

Python SDK (for non-MCP use)

python
from blockrun_llm import setup_agent_wallet

client = setup_agent_wallet()

# GET — same as blockrun_surf({ path, params })
price = client._get_with_payment_raw("/v1/surf/market/price", {"symbol": "BTC"})

# POST — same as blockrun_surf({ path, body })
result = client._request_with_payment_raw("/v1/surf/onchain/sql", {
    "sql": "SELECT count() FROM ethereum.transactions WHERE block_time > now() - INTERVAL 1 HOUR"
})

Full Endpoint Catalog (83 endpoints, 12 categories)

Exchange (CEX) — 7

exchange/markets · exchange/price · exchange/perp · exchange/depth · exchange/klines · exchange/funding-history · exchange/long-short-ratio

Fund (VC intelligence) — 3

fund/detail · fund/portfolio · fund/ranking

Market — 11

market/ranking · market/fear-greed · market/futures · market/price · market/etf · market/options · market/liquidation/exchange-list · market/liquidation/order · market/liquidation/chart · market/onchain-indicator · market/price-indicator

News — 2

news/feed · news/detail

On-chain — 7

onchain/bridge/ranking · onchain/yield/ranking · onchain/gas-price · onchain/tx · onchain/schema · onchain/query (POST) · onchain/sql (POST)

Prediction Markets — 17

Polymarket: prediction-market/polymarket/ranking · .../trades · .../markets · .../events · .../prices · .../volumes · .../open-interest · .../positions · .../activity · prediction-market/category-metrics Kalshi: prediction-market/kalshi/ranking · .../markets · .../events · .../prices · .../trades · .../volumes · .../open-interest

Project + DeFi — 3

project/detail · project/defi/metrics · project/defi/ranking

Search — 11

search/airdrop · search/events · search/kalshi · search/polymarket · search/web · search/project · search/news · search/wallet · search/fund · search/social/people · search/social/posts

Social — 11

social/detail · social/ranking · social/smart-followers/history · social/mindshare · social/tweets · social/tweet/replies · social/user · social/user/followers · social/user/following · social/user/posts · social/user/replies

Token — 4

token/tokenomics · token/dex-trades · token/holders · token/transfers

Wallet — 6

wallet/detail · wallet/history · wallet/net-worth · wallet/transfers · wallet/protocols · wallet/labels/batch

Web — 1

web/fetch

Gotchas

• Required params: 56 of 83 endpoints require at least one param. The 402 response and the in-tool route surface which fields are missing. Missing params → 400 + no charge.
• Solana wallet works too: blockrun_surf routes through whichever chain the BlockRun wallet is on (Base or Solana). Surf settlement always lands in Surf's Base treasury.
• onchain/sql is powerful but unrestricted: there's no row limit on the server side. Add LIMIT to your query or you'll pay for a megabyte of JSON.
• X-Payment-Receipt header lands on the response with the settlement tx hash — keep it for accounting.

Reference

• Surf marketplace page: https://blockrun.ai/marketplace/surf
• Surf upstream docs: https://docs.asksurf.ai
• Surf publisher: https://asksurf.ai
• BlockRun proxy source: src/lib/surf.ts in the BlockRun web repo