Every agent-payable API.

Search arXiv preprints (AI, physics, math, CS, quant finance...) by keywords or field query: title, authors, abstract, categories, dates and PDF link, by relevance or newest. Use for literature review or tracking new research.

article-video POST /article-video/jobs

asset dispatch for autonomous agents

Attention index for any word/entity fusing Wikipedia readership (Wikimedia pageviews, resolved word->article and disambiguated by real traffic) with the global news stream (GDELT coverage volume). Returns a 0-100 index, WoW/MoM deltas, datestamped spikes and a trend in one call. An attention/curiosity index over Wikipedia and world news — not Google Trends / Google search interest.

Wikipedia-readership attention index for a word/entity: resolves the word to an article (disambiguated by real traffic), then returns a 0-100 index, WoW/MoM deltas, a trend and datestamped spikes from daily pageviews. One pageviews call (+ resolution). A curiosity/readership index — not Google Trends.

B2B lead search: give a sector and a country (city optional), get back people currently working at matching companies - name, title, a real work email, and their company's name, domain (when known) and employee count. Async job - POST creates it, free status polling and result retrieval. Up to 25 leads per call. Try GET /company-leads/sample.

badhttp /402/pay: a real x402 v2 paywall for testing clients. Pay 0.01 USDC on Base mainnet and get a 200 with a PAYMENT-RESPONSE receipt and the transaction hash. Nothing else is sold; sibling endpoints under /402 misbehave on purpose.

Consumer sentiment for a food, drink, supplement, skincare or beauty product: what shoppers say about it on Amazon, TikTok, Reddit, YouTube, Instagram, Walmart and more, grouped into what they love, wish for and complain about, with verbatim quotes and source links. The response holds the product id and a read_token; the report is ready a few minutes later at GET /v1/products/{id}/consumer-sentiment with Authorization: Bearer <read_token>.

Cheap structural IBAN validation: ISO 13616 checksum + per-country structure/length. Returns valid plus, on rejection, a granular error_type (invalid_checksum, invalid_length, invalid_structure, invalid_country), the country and the format spec. Offline (schwifty, MIT); no network or keys. A cheap-first entry before the fuller /bank/verify fusion route.

Bank account / IBAN verification in one call: ISO 13616 checksum + per-country structure validation, BIC / bank name / branch resolution, country details, SEPA-zone flag, and a deterministic 0-100 fraud/KYC risk score with a band, reasons and weighted signals. Offline open-registry data (schwifty, MIT). Structural + resolution + risk indicators only; NOT proof the account exists or who owns it, and no name matching. Input not stored.

ERC20 spending allowance an owner has granted a spender on Base mainnet, via allowance(owner,spender).

Resolve a Basename, Base's native ENS-equivalent, to its wallet address via the L2 Basenames resolver.

Fetch a Base mainnet block header and transaction hashes by number, tag (latest/earliest/safe/finalized), or hash via eth_getBlockByNumber/eth_getBlockByHash.

Latest Base mainnet block height via eth_blockNumber - the current chain tip.

Generic read-only eth_call against any Base mainnet contract - pass raw calldata, get the raw return data back.

Can I sell this token? Honeypot check that simulates a real buy then a real sell of a Base mainnet token in one atomic on-chain call via Uniswap V2 - if the sell reverts, that is a honeypot, reported with the exact decoded reason. Factual, never predictive.

Native ETH balance for one Base network address, read live from a public Base RPC node (eth_getBalance) and returned with the snapshot block it was read at.

Current Base network gas price, read live from a public Base RPC node (eth_gasPrice) and returned in both wei and gwei with the snapshot block it was read at.

Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.

Check whether a Base mainnet address is a contract via eth_getCode - returns bytecode size, zero for an externally-owned account.

Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.

ERC1155 multi-token balance for a wallet and token id on Base mainnet via balanceOf(address,uint256).

ERC20 token balance for a wallet on Base mainnet - balanceOf() and decimals() batched into one Multicall3 round trip.

ERC20 Transfer event logs for one token over a Base mainnet block range (max 2,000 blocks) via eth_getLogs.

Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.

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.

Live Base mainnet gas: EIP-1559 base fee, low/medium/high priority tiers in gwei, and a transaction cost estimate for any gas limit.

Cheapest hours of day to transact on Base, from collected gas history: hourly averages in UTC ranked cheapest first, plus the savings percent.

Live gas cost comparison across Base, OP Mainnet, Arbitrum One, and Ethereum in one call, ranked cheapest first.

Historical Base mainnet gas prices over a lookback window: time series, min/max/average/median, and a cheap/normal/expensive verdict for the current price.

Native ETH balance plus up to 20 ERC20 token balances for one wallet on Base mainnet, in a single Multicall3 round trip regardless of token count.

Base mainnet network info in one call: chain ID, block height, and current gas price (wei and gwei).

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.

Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).

Next transaction nonce for any Base mainnet wallet via eth_getTransactionCount - how many transactions it has sent.

The current pending Base mainnet block (mempool, not yet mined) - unconfirmed transactions via eth_getBlockByNumber('pending').

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

Slippage estimate, swap quote, and best DEX price on Base - compares Uniswap v2, Uniswap v3, and Aerodrome on-chain via Multicall3, returns amount received, chosen path, and price impact.

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

Which Base public RPCs serve a stale chain tip. Every 30s we ask all major public RPCs for eth_blockNumber in parallel and record how many blocks behind the fastest peer each was, plus latency and error rate. An RPC never reports its own lag, so an agent reading a balance from a lagging endpoint cannot tell. Omit ?rpc for the full map; ?rpc=<host> for one.

Simulate a Base mainnet transaction before sending it - will it succeed, estimated gas, and the decoded revert reason if it would fail.

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.

Total supply for an ERC20 (normalized by decimals()) or ERC721 (raw count, no decimals) contract on Base mainnet.

Base transaction lookup by hash - sender, recipient, value, calldata, gas and block, live from Base mainnet via eth_getTransactionByHash.

x402 settlement test

x402 settlement test

Base Morpho Blue stablecoin yields

Top-selling x402 bazaar services by unique paying buyers in the last 30 days. Send {"limit":25}, optionally with {"query":"weather"} or {"max_price_usd":0.01}. Per listing: resource URL, host, price, networks, 30-day calls and unique payers, last call time, and description, plus a host leaderboard. Skips listings whose only payment is their own indexing call. From Coinbase discovery metrics, refreshed every 6 hours.

Check an x402 niche before you build or buy. Send {"query":"pdf to markdown"}. Returns matching bazaar listings and hosts, how many have outside paying buyers in the last 30 days, max and median unique payers, price quartiles overall and among listings with demand, top listings and hosts by payers, and a verdict: empty, no-demand, thin-supply, contested, or incumbent-dominated. From Coinbase discovery metrics, refreshed every 6 hours.