Onchain & crypto

Base token safety check: Claude Haiku 5.5 (Anthropic) writes a rug pull / honeypot verdict (SAFE/CAUTION/RISKY/DANGER) from on-chain data, a tagline, a short explanation. Deterministic fallback if Claude is slow, honestly labeled. GET /token-card/sample.

Smart contract event logs on Base mainnet (Base contract events) via eth_getLogs - filter by contract address and up to 4 topics, up to 2,000 blocks, raw logs with topics, data, block and tx hash.

Is this Base contract an upgradeable proxy? Proxy contract detection for EIP-1967 (transparent/UUPS), beacon, or EIP-1822 patterns, returning the implementation address.

Transaction receipt via eth_getTransactionReceipt - status, gas used, and event logs for a mined Base mainnet transaction.

Read a contract storage slot on Base mainnet via eth_getStorageAt - the raw 32-byte value, decoded as hex and unsigned integer, zero-filled if unset.

NFT holdings for a wallet in one Base ERC721 collection, owned token IDs via ERC721Enumerable (tokenOfOwnerByIndex) - up to 20 tokens, requires the collection to implement Enumerable.

NFT metadata URI for an ERC721 token on Base mainnet via tokenURI - the on-chain pointer (IPFS, HTTP, or data URI), not a fetch of the document itself.

Write an on-chain attestation (Ethereum Attestation Service on Base) that binds a call you paid for to the bytes you received: the tool slug, sha256 of the JSON response, the settlement chain and transaction, the payer, the time served and the price, signed by this server's wallet. Give it the settlement transaction from the PAYMENT-RESPONSE (or Payment-Receipt) header of any settled call; the attestation UID and its public page on base.easscan.org come back.

Trending base DEX pairs by 24h volume (top boosted tokens on DexScreener).

+15 more from 47620 Base Data API

Trending polygon DEX pairs by 24h volume (top boosted tokens on DexScreener).

+15 more from 47620 Polygon Data API

The full decision pack in ONE call: spot + 24h stats, last candle, technical indicators (RSI/EMA/SMA), perpetual funding + open interest, and order-book spread/imbalance. Everything a trading agent needs to size and time a position. Query: interval (default 1h).

+6 more from 47620 Crypto Market Data API

Decode a JWT (JSON Web Token): returns the header, payload and the extracted claims (subject sub, issuer iss, audience aud, expiration exp with `expired` flag and seconds remaining, issued-at iat, not-before nbf, algorithm alg, key id kid). Decode-only — the signature is NOT verified, so claims are informational. Pass the token via ?token=<jwt> (query param, no length limit).

DEX Fee, Slippage and Break-Even Guide — On-chain & DeFi

+7 more from Saylor Innovations Guide Library

The active deepnets watchlist - high-volume tokens that passed the safety screen, with current safety data. Covers Solana, Robinhood Chain and Base; EVM entries carry `chain` and a 0x `mint`. Filter with `chain`.

+5 more from api.deepnets.ai

chainpeek (Tanod) latest block number, timestamp and age in seconds of Ethereum, Base or Robinhood Chain. Use when an agent needs the latest block number of Ethereum, Base or Robinhood Chain, with its timestamp and age in seconds.

+65 more from Tanod chainpeek

utilpeek (Tanod) cryptographic randomness: integers, floats, bytes, UUID v4, dice rolls, picks and shuffles from a CSPRNG. Use when an agent needs cryptographic random integers, floats, bytes, dice rolls, or a random pick or shuffle of a list.

+5 more from Tanod utilpeek

Upcoming crypto event resolutions — Upcoming crypto market resolutions in date order with current blended probabilities — the forward calendar of crypto events an agent can position around. Same shape as /v1/calendar, pre-filtered to crypto markets.

+6 more from x402-factory

Check a Base address before an agent pays or approves it. Input: one address. Output: allow or warn. Reports wallet or contract, whether the wallet has sent a transaction, whether a contract already had code 7 days ago, and whether it is a proxy (EIP-1967, EIP-1167, or implementation()). Warns on contract_is_new, proxy, or no_outgoing_transactions. Wallet age is unknown. A deleted contract looks like a wallet. Not proof of theft.

EVM gas oracle for any major chain - Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche: next-block baseFee plus slow, med and fast priority-fee tiers (maxFeePerGas and maxPriorityFeePerGas), read live from chain state in one call. Choose network (default Ethereum). EIP-1559 and legacy handled.

Generate a secure random integer in a caller-supplied range for $0.001 USDC. Call when you need a CSPRNG draw for ids, jitter, or sampling without installing a crypto library. First-party local only—not a lottery, custody, or production RNG SLA. No API key, no subscription.

Status of every Ethereum Improvement Proposal as JSON: number, title, status (living, final, last-call, review, draft, stagnant, withdrawn) and link, plus counts by status. Parsed live from eips.ethereum.org (EIPs are CC0).

+1 more from Protocol Radar - Aaron Zhang

Search awarded US federal contracts and grants from USASpending.gov, filtered by award type, recipient, agency, NAICS, keyword and fiscal year, returning a normalized award list plus a summary.

Perpetual-swap funding rates for an asset fused across decentralized venues (Hyperliquid, dYdX v4): each venue's current funding plus an open-interest weighted aggregate funding rate, annualized APR, the cross-venue spread and dispersion. One normalized call instead of polling each protocol and reconciling funding intervals yourself.

Bitcoin mining hashprice: expected mining reward per petahash and per terahash per second per day, in BTC and USD, fused with the network hashrate, current difficulty, the next difficulty-retarget forecast and the block-subsidy and average-fee split. Informational, not advice.

Crypto Fear & Greed index with a market-timing trend: current value and classification, 7-day and 30-day deltas, streak in the current regime, 30-day min and max, and a contrarian flag on extreme fear or greed. Keyless.

Native-coin balance + ERC-20 token balances (raw + human) for any address on Base, Ethereum, Arbitrum, Optimism, Polygon or BNB (default Base). On Base pass token symbols or 0x addresses (or a default common set); on other networks pass explicit 0x token addresses.

Market-wide screener of the biggest upcoming token unlocks across many crypto tokens in a forward window. Returns the largest scheduled unlocks ranked by USD value or by percent of circulating supply, each with its date, token amount and protocol. Bounded fan-out across the most active emitters. Data from DeFiLlama, cited.

Rich cross-source market report for 50+ assets (crypto, stablecoins, forex, metals): Chainlink + DEX pools, TVL-weighted VWAP, total pool TVL, recent change and volatility — all computed by us from on-chain state.

Trending Base DEX pools ranked by recent swap volume and net buy/sell flow over a short window, computed by us from public Aerodrome/Uniswap-V3 Swap event logs.

On-chain DeFi liquidation telemetry for Base lending protocols: recent LiquidationCall events decoded by us from public Base event logs — count, total debt repaid and collateral seized (USD), estimated liquidation bonus, per-protocol and per-asset breakdown, and the recent events (user, liquidator, collateral, debt).