x402centre.roverbot.workers.dev

Live on-chain state: gas + cost + head block across L1/Base/Arbitrum/Optimism, fresh-sampled, block-anchored

Why Ethereum — upgrades, honest tradeoffs, the AI agent angle

End-to-end: dApp idea to production (routes through all skills)

CROPS architecture review: censorship, openness, privacy, security

EIP lifecycle, fork process, what's actually planned

Real gas prices (<1 gwei) and what actions actually cost

Creating wallets, safe signing, multisig, account abstraction

Current L2 landscape, selection guide, bridging, deployment gotchas

ERC-20/721/1155, ERC-8004 agent identity, EIP-7702, EIP-3009, x402

Frameworks, RPCs, MCPs, Foundry — what actually works today

DeFi legos: Uniswap, Aave, Curve — and how to compose them

Three-phase build system for complete Ethereum applications

Verified contract addresses — stop hallucinating addresses

Mental models: nothing is automatic, randomness, incentives

Solidity vulnerabilities with defensive code, pre-deploy checklist

Noir ZK circuits: commitment-nullifier pattern, Solidity verifiers

Foundry unit/fuzz/fork/invariant testing — what to test, what not to

Events as API, The Graph, Dune, reading current vs historical state

Onchain button loaders, four-state flow, USD values, error UX

IPFS/Vercel/ENS deploy pipeline and pre-publish checklist

Pre-ship QA audit: wallet flows, branding, RPC config, deep linking

Smart contract security audit checklist, 19 domains

Where AI agents get paid work on Base: bounty venues, per-call x402, and on-chain payment evidence

I paid with x402: how a buyer verifies the settlement landed — 402 → EIP-3009 → PAYMENT-RESPONSE, what settled means on Base, and a hand-checkable worked example

Merged: plan -> architecture -> CROPS -> contracts -> test -> ship

Merged: security + testing + QA into one pre-flight package

Merged: L2 comparison + real costs + when mainnet actually wins

Merged: agent wallet guardrails + ERC-8004 identity + x402 payments

Merged: DeFi legos + verified addresses + build system + safety

Polymarket public markets (?q=, ?active=true, ?closed=, ?order=volume24hr|liquidity|endDate, ?limit=1..50 default 20): rows with question, slug, event URL, per-outcome numeric prices, 24h volume, liquidity, endDate; sorted server-side. Market data only, not investment advice.

Hyperliquid carry per perp (?coin=HYPE): funding APR now/1d/7d/30d, positive-hour share, perp depth at 10/25/50 bps each side, USDC spot hedge and its depth, taker round-trip cost, breakeven days, thin-book flags.

Is this x402 offer safe to sign? Pass ?url= the paid resource. Checks payTo, canonical USDC, EIP-712 domain vs chain, resource host, amount, window and /.well-known/x402 on 7 EVM chains, v1 and v2. SAFE / WARN / UNSAFE.

Passive seller audit of an x402 origin (?origin=): 402 + decodable PAYMENT-REQUIRED shape, payTo sanity, network and USDC canonicality, resource.url host match, well-known payTo cross-check, amount and window flags. SAFE / WARN / UNSAFE or not_an_x402_origin. Data only - never a trade instruction.

SEC filing triggers for a ticker or CIK (?ticker=COIN or ?cik=; ?windowDays=45): latest 10-Q plus recent 8-Ks with the EDGAR item codes (1.01-9.01) found per document, filing/report dates, accessions and per-document EDGAR URLs. Data only - never a trade instruction.

Base USDC transfer facts (?tx=0x.. or ?address=0x..&n=1..50): amount, from, to, block, gasUsed, status, the canonical-USDC Transfer rows, and whether an EIP-3009 transferWithAuthorization leg is present. Last-n USDC transfers for an address, newest-first. On-chain facts - not investment advice.

Cross-venue funding spread per coin (?coin=ETH): Hyperliquid's own funding vs Lighter's own (dark-venue) funding, APR at each hourly cadence, the spread in bps/yr with direction, the CEX basis mirrors, and book depth (USD within 25 bps, thin flags) on both books. Data, not a trade instruction.

Hyperliquid carry screener (?n=1..25, default 10): spot-hedgeable perps capped at 50 by OI, ranked by 7d realized funding APR; per row: hedge pair, OI USD, current rate + direction, perp and hedge depth within 25 bps, thin-book gate verdict. Data, not a trade instruction.

Perp-vs-spot basis on one Hyperliquid perp (?coin=ETH): signed basis bps (premium/discount), taker round-trip cost and cover flag, OI USD, USDC spot hedge, depth within 25 bps per book, thin-book verdict, and a divergence flag. Per-coin twin of /data/hl/basis-screen. Data, not a trade instruction.

Hyperliquid perp basis screener (?n=1..25, default 10): spot-mapped perps ranked by live perp-vs-spot basis in bps; divergence gate (legs at the same price level), OI USD, taker round-trip cost and cover flag, perp and hedge depth within 25 bps, thin-book verdict. Data, not a trade instruction.

Cross-venue funding screener: perps on both Hyperliquid and Lighter ranked by the spread of the venues' own funding (APR + bps/yr, delta-neutral direction), top n (default 10) with both books' depth within 25 bps, thin-book flags, open interest in USD. Native rates, never CEX mirrors. Data only.

Cross-coin Hyperliquid funding spread (?coinA=X&coinB=Y): 1d/7d/30d windows of both legs' hourly funding (mean/APR/cv/flips) and the GROSS spread A-B on jointly-printed hours; spreadSide, 4 flags, OI context, applied policy. Gross, no execution cost; data only, never a trade instruction.

SEC 8-K item watch (?ticker= or ?cik=, ?since= (default 30d)): every 8-K filed since the date with the EDGAR item codes found per document, filing and report dates, accessions, per-document EDGAR addresses, and a changes summary of which items on which dates. Data only - never a trade instruction.

Base ERC-20 safety facts (?address=0x..): name, symbol, decimals, totalSupply, bytecode size, owner/renounce state, EIP-1967 upgradeability, plus DexScreener price, deepest-pair liquidity, pair age, 24h volume. Rules-based LOW/MEDIUM/HIGH verdict, one reason per fired rule. Facts, not advice.

Crypto Fear and Greed index (alternative.me, keyless): current value 0..100 with its sentiment label, ?days=1..30 default 7 of daily history, avg, low, high and trend (rising|falling|flat). Sentiment data, not investment advice.

Verify an x402 settlement on Base (?tx=0x..&payTo=0x.., ?amountUsd= optional): receipt status, block, from, plus whether a canonical-USDC Transfer to the expected payTo is in the receipt - settled, matchedLog {to, amountUsd}, payToMatch, amountMatch. Facts only.

Coins agents are searching right now: CoinGecko trending (?n=1..25 default 10) with rank (current list position), USD price and 24h change, keyless. Market data only, not investment advice.

A coin's market profile in one call: ?symbol=BTC|ETH|SOL (default BTC) -> rank, market cap, USD price, 24h/7d change, ATH and distance from ATH (fromAthPct), keyless CoinGecko. Market data only, not investment advice.