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Which EVM chain is cheapest to execute on right now? Live gas price on Base, Ethereum, Arbitrum, Optimism, Polygon and BSC, converted to USD per native transfer (21k gas), ERC-20 transfer (65k) and swap (150k), sorted cheapest first, with cheapest chain, Ethereum-vs-cheapest multiple and a one-line recommendation. chains=base,ethereum,... to filter, gas=N for your own gas units. Multi-RPC failover per chain, native prices Binance>OKX>Coinbase, 30s cache.

Live X (Twitter) search for agents that cannot read X: q=keyword|$TICKER|from:handle (X search operators ok), limit=1-20 (default 10), lang=en|ko|.., sort=recency|relevancy. Returns posts [{id,url,text,author{handle,name,followers,verified},metrics{likes,reposts,replies,quotes},created_at,lang}] plus signal {top_claim (most-engaged post: the tip/claim), sentiment bullish|bearish|neutral with score, top_terms, cashtags, notable_handles, engagement}. Last 7 days, no retweets. 4xx/5xx not charged.

ERC-20 approval check on Base: how much can spender move from owner? owner=0x..&spender=0x..[&token=0x.., default USDC][&amount=] -> allowance, unlimited flag, owner balance, exposure (min of allowance and balance), known spender label (Permit2, Uniswap, 1inch, 0x, Odos, Aerodrome), risk class, revoke_recommended + ready approve(spender,0) calldata, can_spend when amount= given. Use before transferFrom/swap, or to audit a wallet's dangerous approvals.

Base gas oracle for agents sending Base txs: EIP-1559 slow / standard / fast tiers (maxFeePerGas + maxPriorityFeePerGas in gwei and wei hex, from eth_feeHistory 20 blocks p10/p50/p90), base fee, congestion 0-1, recommended_tier, ready-to-sign tx_fields, and est. cost in ETH + USD for your gas_limit (default 21000; use 65000 for an ERC-20 transfer). Cheapest paid call ($0.001).

Pay-per-call Base mainnet JSON-RPC, no API key, no account: GET ?method=eth_call&params=[...] (params = URL-encoded JSON array) or POST a standard JSON-RPC body. POST a batch of up to 10 calls for ONE $0.002 payment (vs $0.005 per call at other x402 RPC gateways). Read + broadcast methods: eth_blockNumber, eth_chainId, eth_call, eth_estimateGas, eth_getBalance, eth_getTransactionCount, eth_getCode, eth_getStorageAt, eth_getTransactionByHash, eth_getTransactionReceipt, eth_getBlockByNumber,...

OHLCV candlesticks (klines) for any major USDT pair with indicators precomputed, so your trading agent skips the math: symbol=BTC|ETH|SOL|BNB|XRP|DOGE|ADA|AVAX|LINK|SUI|... (or BTCUSDT), interval=1m|5m|15m|1h|4h|1d (default 1h), limit=10-500 (default 100). Returns candles [{t,o,h,l,c,v}] oldest->newest plus last close, change_pct over the window, EMA20, EMA50, RSI14, ATR14 (abs + pct), trend up|down|range, and a pullback zone EMA20 +/- 0.75*ATR (in_zone true/false).

What am I about to sign? Pre-sign calldata decoder for Base: data=0x.. (selector+args) [&to=0x.. token/contract for symbol+decimals] or hash=0x.. (decode an existing tx). Resolves the 4-byte selector (builtin + openchain + 4byte, collision-checked by ABI round-trip), returns function signature, typed args, plain-English summary, risk none|low|medium|high, flags (unlimited_approval, unknown_spender, approve_all_nfts, offchain_permit, permit2_allowance, batched_calls, inner_approval,...

DeFi TVL in ONE call (others sell TVL and DeFi overview as two $0.003 calls): total DeFi TVL with 1d/7d/30d % change and flow inflow|flat|outflow, signal RISK_ON|NEUTRAL|RISK_OFF, top chains ranked by TVL with share %, Base rank+share; chain=Base|Ethereum|Solana|... adds that chain's TVL, rank, share and 1d/7d/30d flow; protocol=aave|lido|uniswap|aerodrome (DefiLlama slug) adds protocol TVL and share. limit=1-50 top chains (default 15).

Live ERC-20 balance on Base: token=0x..&wallet=0x.. -> balance (decimals applied), raw, symbol, block.

Live native ETH balance + nonce for a wallet on Base: wallet=0x..

Pay-per-call Ethereum mainnet (chain 1) JSON-RPC, no API key, no account, paid in Base USDC: GET ?method=eth_call&params=[...] or POST a standard JSON-RPC body; POST a batch of up to 10 calls for ONE $0.002 payment (vs ~$0.01 per call at other x402 mainnet RPC APIs). Methods: eth_blockNumber, eth_chainId, eth_call, eth_estimateGas, eth_getBalance, eth_getTransactionCount, eth_getCode, eth_getStorageAt, eth_getTransactionByHash, eth_getTransactionReceipt, eth_getBlockByNumber,...

Crypto Fear & Greed Index with context, not just a number: value 0-100 + label now, previous reading, 1d/7d/30d change, 7d and 30d average, min/max 30d, streak (days in current zone), trend rising|falling|flat, contrarian signal BUY_FEAR|SELL_GREED|NEUTRAL, and optional history (days=1-30). When to call: daily summary, position sizing, or a sentiment gate before a trade. Same $0.001 as bare F&G APIs, 5x cheaper than $0.005 ones. Source alternative.me; 503 when down = not charged.

Cross-exchange perp funding in one call: Hyperliquid + OKX + Gate + dYdX (+ Bybit/Binance/Bitget when reachable) funding APR per coin (BTC/ETH/SOL), mean APR, positioning signal EXTREME_LONG|LONG_HEAVY|NEUTRAL|SHORT_HEAVY|EXTREME_SHORT|MIXED, and the best funding-arb pair (short the highest venue, long the lowest) with spread APR. When to call: before opening a leveraged position, to spot squeeze setups, or to scan funding-divergence arbitrage. Optional coin=BTC.

Whole-crypto-market context in one call: total crypto market cap (USD) and 24h change, 24h trading volume, Bitcoin (BTC) and Ethereum (ETH) dominance, altcoin share, DeFi TVL across all chains, total USD stablecoin supply with 1d/7d flow (dry powder entering or leaving crypto), stablecoin share of market cap, Fear & Greed index, and a regime label RISK_ON|NEUTRAL|RISK_OFF with reasons.

Hyperliquid perp L2 top-of-book for coin=BTC|ETH|SOL: best bid/ask, mid, spread_bps, top N levels (depth=1-20, default 5).

Hyperliquid perp funding (hourly + APR), open interest (coins + USD), mark/oracle/mid px, 24h volume for BTC, ETH, SOL. Optional coin=BTC.

Live Korea kimchi premium: Upbit KRW vs global USD (median of Coinbase, Kraken, Bitstamp) for BTC and ETH, plus USD/KRW FX. Korea crypto arb/sentiment signal. Optional symbols=BTC,ETH filter. Alias: /kr/kimchi-premium.

One-call crypto market regime for trading agents: BTC/ETH/SOL median spot + 24h change, Hyperliquid funding APR + open interest, Korea kimchi premium, Crypto Fear & Greed index, and a regime label (risk_on|neutral|risk_off) with plain reasons. Replaces 4 calls (prices+hl-funding+kimchi+sentiment, $0.015) for $0.004.

Is anything breaking in crypto right now? One composite 0-100 market-stress score (low|moderate|elevated|high) with a per-leg breakdown: stablecoins (worst USDC/USDT/DAI peg deviation in bps + 7d supply flow), price & breadth (BTC 24h move + share of ~140 liquid Hyperliquid perps that are up), leverage (BTC funding APR + share of perps at extreme funding), volatility (BTC 1h ATR14 as % of price) and sentiment (Fear & Greed).

Whole-market perp scanner (all ~200 Hyperliquid perps) in one call: top_gainers, top_losers, top_volume, top_open_interest, highest_funding (crowded longs), most_negative_funding (crowded shorts / squeeze candidates), unusual_activity (24h volume / OI), plus market breadth (advance_ratio, broad_rally|mixed|broad_selloff). Each row: coin, mark_px, change_24h_pct, volume_24h_usd, open_interest_usd, funding_apr_pct, premium_bps, max_leverage.

Paid heartbeat: cheapest way to test your x402 client end-to-end on Base USDC. Returns {ok:true,t,next}.

Live prediction-market odds (Polymarket) as clean implied probabilities, so your agent can price events: q=bitcoin|ethereum|solana|fed|election|any keyword (default crypto), limit=1-20 events (default 8), markets=1-20 per event (default 6). Returns events sorted by 24h volume, each with markets [{question, outcome_label, yes_prob, no_prob, best_bid, best_ask, change_1d, volume_24h, liquidity, end_date, url}], contested markets (5-95%) first; plus top_contested (the most-traded genuinely...

Spot USD prices: median of Coinbase, Kraken, Bybit, Binance, CoinGecko (whichever respond) with n_sources, dispersion_bps, with 24h change/volume. symbols=BTC,ETH,SOL default; also BNB,XRP,DOGE,ADA,AVAX,LINK,SUI.

Is USDC / USDT / DAI / USDe holding its $1 peg, and is stablecoin liquidity growing (risk-on) or shrinking (risk-off)? Top USD stablecoins: price, peg deviation in bps, status OK|DRIFT|WARN|DEPEG, Kraken cross-check for USDT/USDC/DAI, supply + 1d/7d change, dominance, supply on Base; plus total supply flow 1d/7d/30d, verdict ALL_PEGGED|WATCH|DEPEG_ALERT and alerts. When to call: before settling or parking funds in a stablecoin, as a systemic risk-off check in a trading loop.

How much will I get, and what do I sign? Best-route swap quote on Base for any token pair: from=USDC|ETH|WETH|cbBTC|DAI|AERO|DEGEN|BRETT|VIRTUAL or 0x.. &to=..&amount=10 (human units) [&wallet=0x.. for ready-to-sign calldata + approval check] [&slippage_bps=50]. Aggregates 100+ Base DEX pools (KyberSwap meta-aggregator, OpenOcean fallback).

Should your agent buy this Base token? Half the price of $0.02 AI token-verdict quests, deterministic on-chain checks instead of an LLM opinion. One-call verdict OK|CAUTION|AVOID + should_buy + can_sell + plain-English reasons, backed by risk_score 0-100 + level, flags (honeypot, cannot_sell_all, high tax, mintable, hidden owner, proxy, blacklist, unverified), bytecode size, EIP-1967 proxy impl, owner(), buy/sell tax, honeypot simulation, top10 holder pct, holders. address=0x... (Base ERC-20).

Did this Base transaction succeed, and who paid whom? hash=0x.. (64 hex) -> status success|failed|pending, block, confirmations, timestamp, from, to, ETH value, gas used + fee in ETH, method (transfer / approve / transferWithAuthorization / Multicall3 ...), is_x402_settlement (EIP-3009 AuthorizationUsed on USDC), and every decoded ERC-20 Transfer (token, symbol, from, to, amount with decimals).

One-call Base wallet quick check (agent self-check or counterparty/payee check before you pay): native ETH + nonce + USDC balance + live gas cost of an ERC-20 transfer, and can_pay_gas / can_pay_x402 booleans. Cheaper than eth-balance + erc20-balance + base-gas separately ($0.006). wallet=0x..

Should my agent pay this x402 endpoint? Live pre-payment check of ANY x402 URL (never pays it): we GET the target unpaid and decode its 402 quote (PAYMENT-REQUIRED header for v2, JSON body for v1) -> x402 version, every accepts[] option with real USD price (atomic amount / decimals), network name, asset (is it canonical USDC on that chain?), scheme, payTo, maxTimeoutSeconds, resource URL match, Bazaar discovery schema present?, description, latency_ms and TLS.

Spot USD prices: median of Coinbase, Kraken, Bybit, Binance, CoinGecko (whichever respond) with n_sources, dispersion_bps, with 24h change/volume. symbols=BTC,ETH,SOL default; also BNB,XRP,DOGE,ADA,AVAX,LINK,SUI.

Whole-market perp scanner (all ~200 Hyperliquid perps) in one call: top_gainers, top_losers, top_volume, top_open_interest, highest_funding (crowded longs), most_negative_funding (crowded shorts / squeeze candidates), unusual_activity (24h volume / OI), plus market breadth (advance_ratio, broad_rally|mixed|broad_selloff). Each row: coin, mark_px, change_24h_pct, volume_24h_usd, open_interest_usd, funding_apr_pct, premium_bps, max_leverage.

Chain growth rankings in one GET (Nansen sells chain-rank at $0.01 as POST; ours $0.003): 12 major chains (Ethereum, Solana, BSC, Base, Arbitrum, Hyperliquid L1, Tron, Polygon, Optimism, Avalanche, Sui, Monad) ranked by momentum_score from DEX volume 7d-over-7d and 30d-over-30d % plus TVL 7d flow, with trend GROWING|STABLE|SHRINKING, TVL + share, 24h/7d/30d DEX volume, rank by TVL/volume/momentum, and spike/data-anomaly flags. sort=momentum|tvl|volume; chain=Base adds a focus block.

What is at this address? One-call contract introspection on Base (default) or Ethereum (chain=eth): EOA vs contract vs EIP-7702 delegated wallet, bytecode size, kind ERC20|ERC721|ERC1155|SAFE_MULTISIG|PROXY|MINIMAL_PROXY|CONTRACT, token metadata (name, symbol, decimals, totalSupply), ERC-165 interfaces, upgradeable proxy detection (EIP-1967 implementation/admin/beacon slots, EIP-1167 clones) with the live implementation address, owner() and renounced flag, Safe threshold, native balance,...

DeFi TVL in ONE call (others sell TVL and DeFi overview as two $0.003 calls): total DeFi TVL with 1d/7d/30d % change and flow inflow|flat|outflow, signal RISK_ON|NEUTRAL|RISK_OFF, top chains ranked by TVL with share %, Base rank+share; chain=Base|Ethereum|Solana|... adds that chain's TVL, rank, share and 1d/7d/30d flow; protocol=aave|lido|uniswap|aerodrome (DefiLlama slug) adds protocol TVL and share. limit=1-50 top chains (default 15).

ENS + Basenames resolver both ways in one call: name=vitalik.eth or jesse.base.eth -> address, or address=0x.. -> primary ENS name and primary Basename (ENSIP-19 Base reverse). Returns verified (forward and reverse agree), safe_to_send, profile records (avatar, url, description, twitter, github, telegram, email), and whether the address is a contract on Base. CCIP-read handles *.base.eth.

ENS + Basenames resolver both ways in one call: name=vitalik.eth or jesse.base.eth -> address, or address=0x.. -> primary ENS name and primary Basename (ENSIP-19 Base reverse). Returns verified (forward and reverse agree), safe_to_send, profile records (avatar, url, description, twitter, github, telegram, email), and whether the address is a contract on Base. CCIP-read handles *.base.eth.

Base gas oracle for agents sending Base txs: EIP-1559 slow / standard / fast tiers (maxFeePerGas + maxPriorityFeePerGas in gwei and wei hex, from eth_feeHistory 20 blocks p10/p50/p90), base fee, congestion 0-1, recommended_tier, ready-to-sign tx_fields, and est. cost in ETH + USD for your gas_limit (default 21000; use 65000 for an ERC-20 transfer). Cheapest paid call ($0.001).

Which EVM chain is cheapest to execute on right now? Live gas price on Base, Ethereum, Arbitrum, Optimism, Polygon and BSC, converted to USD per native transfer (21k gas), ERC-20 transfer (65k) and swap (150k), sorted cheapest first, with cheapest chain, Ethereum-vs-cheapest multiple and a one-line recommendation. chains=base,ethereum,... to filter, gas=N for your own gas units. Multi-RPC failover per chain, native prices Binance>OKX>Coinbase, 30s cache.

Should your agent buy this Base token? Half the price of $0.02 AI token-verdict quests, deterministic on-chain checks instead of an LLM opinion. One-call verdict OK|CAUTION|AVOID + should_buy + can_sell + plain-English reasons, backed by risk_score 0-100 + level, flags (honeypot, cannot_sell_all, high tax, mintable, hidden owner, proxy, blacklist, unverified), bytecode size, EIP-1967 proxy impl, owner(), buy/sell tax, honeypot simulation, top10 holder pct, holders. address=0x... (Base ERC-20).

Perp derivatives positioning in ONE GET (others sell open interest $0.006, long/short ratio $0.006 and liquidations $0.007 as 3 separate calls; ours all-in-one $0.003): open interest USD (OKX + Hyperliquid) with 1h/4h/24h change, long/short account ratio with 48h percentile, liquidations longs vs shorts USD over 1h/4h/24h + largest and last 5, taker buy/sell volume 1h/4h/24h, funding 8h + APR (OKX + Hyperliquid), and verdict...

Perp derivatives positioning in ONE GET (others sell open interest $0.006, long/short ratio $0.006 and liquidations $0.007 as 3 separate calls; ours all-in-one $0.003): open interest USD (OKX + Hyperliquid) with 1h/4h/24h change, long/short account ratio with 48h percentile, liquidations longs vs shorts USD over 1h/4h/24h + largest and last 5, taker buy/sell volume 1h/4h/24h, funding 8h + APR (OKX + Hyperliquid), and verdict...

Perp derivatives positioning in ONE GET (others sell open interest $0.006, long/short ratio $0.006 and liquidations $0.007 as 3 separate calls; ours all-in-one $0.003): open interest USD (OKX + Hyperliquid) with 1h/4h/24h change, long/short account ratio with 48h percentile, liquidations longs vs shorts USD over 1h/4h/24h + largest and last 5, taker buy/sell volume 1h/4h/24h, funding 8h + APR (OKX + Hyperliquid), and verdict...

BTC/USD live spot price (one URL per coin). Spot USD prices: median of Coinbase, Kraken, Bybit, Binance, CoinGecko (whichever respond) with n_sources, dispersion_bps, with 24h change/volume. symbols=BTC,ETH,SOL default; also BNB,XRP,DOGE,ADA,AVAX,LINK,SUI.

ETH/USD live spot price (one URL per coin). Spot USD prices: median of Coinbase, Kraken, Bybit, Binance, CoinGecko (whichever respond) with n_sources, dispersion_bps, with 24h change/volume. symbols=BTC,ETH,SOL default; also BNB,XRP,DOGE,ADA,AVAX,LINK,SUI.

SOL/USD live spot price (one URL per coin). Spot USD prices: median of Coinbase, Kraken, Bybit, Binance, CoinGecko (whichever respond) with n_sources, dispersion_bps, with 24h change/volume. symbols=BTC,ETH,SOL default; also BNB,XRP,DOGE,ADA,AVAX,LINK,SUI.

Pre-sign transaction simulation on Base: run the tx against live state before you sign or broadcast. from=0x..&to=0x..&data=0x..[&value_eth=0.01] or calls=[{to,data,value}] (JSON, up to 5, run in order, e.g. approve then swap). Returns success, decoded revert reason, gas used + fee in ETH/USD, every token and ETH transfer (symbol, decimals applied), net balance_changes per address (and for the sender), approvals granted (unlimited flag), decoded function, flags and verdict...

Pre-sign transaction simulation on Base: run the tx against live state before you sign or broadcast. from=0x..&to=0x..&data=0x..[&value_eth=0.01] or calls=[{to,data,value}] (JSON, up to 5, run in order, e.g. approve then swap). Returns success, decoded revert reason, gas used + fee in ETH/USD, every token and ETH transfer (symbol, decimals applied), net balance_changes per address (and for the sender), approvals granted (unlimited flag), decoded function, flags and verdict...

One-call Base wallet quick check (agent self-check or counterparty/payee check before you pay): native ETH + nonce + USDC balance + live gas cost of an ERC-20 transfer, and can_pay_gas / can_pay_x402 booleans. Cheaper than eth-balance + erc20-balance + base-gas separately ($0.006). wallet=0x..

Which x402 API should my agent pay for this task? need=<task in plain words> -> ranked candidates with evidence: live x402scan 24h settled payments per seller (tx count, unique buyers, USD volume, average paid price), matched keywords, plus matching routes on this server with price and free sample link, one recommendation, and a ready /crypto/x402-check?url= link to live-probe the pick before paying. max_usd= filters by price.

Is USDC / USDT / DAI / USDe holding its $1 peg, and is stablecoin liquidity growing (risk-on) or shrinking (risk-off)? Top USD stablecoins: price, peg deviation in bps, status OK|DRIFT|WARN|DEPEG, Kraken cross-check for USDT/USDC/DAI, supply + 1d/7d change, dominance, supply on Base; plus total supply flow 1d/7d/30d, verdict ALL_PEGGED|WATCH|DEPEG_ALERT and alerts. When to call: before settling or parking funds in a stablecoin, as a systemic risk-off check in a trading loop.

Latest Korean DART corporate filings for a KOSPI/KOSDAQ ticker, English summary (korea, kospi, dart)

Live Korea kimchi premium: Upbit KRW vs global USD for BTC and ETH, plus USD/KRW FX. Korea crypto arb/sentiment signal. Optional symbols=BTC,ETH filter. Alias: /kr/kimchi-premium.

Korean news search summarized in English with sentiment (korea, kospi, news)

Paid heartbeat / x402 payment test: cheapest way to verify your x402 client end-to-end on Base USDC ($0.001). Pass testRunId= (or echo=) to correlate a validation run. Returns {ok, paymentVerified:true, receiptId, testRunId, nextAction, next_calls}. Aliases: /test, /pay, /x402/test, /crypto/test, /v1/ping.

Did this Base transaction succeed, and who paid whom? hash=0x.. (64 hex) -> status success|failed|pending, block, confirmations, timestamp, from, to, ETH value, gas used + fee in ETH, method (transfer / approve / transferWithAuthorization / Multicall3 ...), is_x402_settlement (EIP-3009 AuthorizationUsed on USDC), and every decoded ERC-20 Transfer (token, symbol, from, to, amount with decimals).

Which EVM chain is cheapest to execute on right now? Live gas price on Base, Ethereum, Arbitrum, Optimism, Polygon and BSC, converted to USD per native transfer (21k gas), ERC-20 transfer (65k) and swap (150k), sorted cheapest first, with cheapest chain, Ethereum-vs-cheapest multiple and a one-line recommendation. chains=base,ethereum,... to filter, gas=N for your own gas units. Multi-RPC failover per chain, native prices Binance>OKX>Coinbase, 30s cache.