Call when an agent needs a read-only Ethereum eth_call. Send to and data (hex) or a function signature plus args. Optional from and block. Reverts return a decoded reason. No state change and no spend. Send JSON {"to":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","data":"0x18160ddd"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/eth-call first.

Call when an agent needs a cached summary of the public CDP x402 Bazaar: total resources, top payers, newest entries, and price stats. Optional top and newest, at most 20. Only the CDP discovery host is fetched. Send JSON {"top":1,"newest":1}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/bazaar-pulse first.

Call when an agent needs the ERC-721 token ids one wallet owns in an Ethereum collection, via tokenOfOwnerByIndex when enumerable (at most 100). Unsupported enumeration errors and is not billed. No log scan. Send JSON {"contract":"0x1111111111111111111111111111111111111111","owner":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/eth-erc721-tokens first.

Call when an agent needs OHLCV candles for a spot symbol and interval (1m, 5m, 15m, 1h, 4h, 1d), limit up to 500. Tries Coinbase Exchange, Kraken, OKX, then Binance. No API key. Send JSON {"symbol":"BTC-USD","interval":"1h","limit":2}. Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/crypto-candles first.

Call when an agent needs Polymarket markets from the public Gamma API, with outcomes, prices, decimal odds, volume, liquidity, and end date. Optional search, tag, limit, active, and closed. Send JSON {"tag":"bitcoin","limit":1,"active":true,"closed":false}. Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/polymarket-markets first.

Call when an agent needs raw Base logs for one contract, with optional topic0-topic3, a capped block range, and an optional event signature for decoding. Public mainnet.base.org windows stay small and HTTP 429 is not billed. Read-only. Send JSON fields address (string), topic0 (string), event (string). Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/base-events first.

Call when an agent needs the latest SEC EDGAR filings for a ticker or CIK, with an optional form filter, a limit, and filing URLs. The ticker map is cached. The call sends SEC's required User-Agent. Recent submissions only. Send JSON {"ticker":"AAPL","form":"10-K","limit":1}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/sec-edgar-filings first.

Call when an agent needs deduped crypto headlines from CoinDesk, The Block, Decrypt, and Cointelegraph, newest first, with source links. Optional q (BTC also matches Bitcoin) and limit. Feeds are cached for a few minutes. Send JSON {"q":"BTC","limit":1}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/crypto-news first.

Call when an agent needs the latest public spot trades for a symbol, newest first, limit up to 100. Tries Coinbase Exchange, Kraken, OKX, then Binance. No API key. Send JSON {"symbol":"BTC-USD","limit":2}. Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/crypto-trades first.

Call when an agent needs all supported FX pairs and the symbol list in one call. Kraken's public ticker is the book; its timestamp is the receive time. If Kraken fails, Yahoo last prices are used and bid and ask are null. Distinct from daily ECB fx-rates. Send JSON {}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/fx-all first.

Call when an agent needs ERC-20 Transfer logs on Base filtered by token and/or wallet over a bounded block range (default the latest 2000 blocks, max 10000, at most 50). Amounts are raw and human when decimals() is readable. Read-only. No spend. Send JSON {"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","wallet":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/base-erc20-transfers first.

Call when an agent needs a near-real-time FX bid, ask, and mid for one pair such as EURUSD. Kraken's public book supplies bid and ask, which can be wide, plus the spread timestamp. If Kraken fails, Yahoo's last price is the mid and bid and ask are null. Distinct from daily ECB fx-rates. Send JSON {"pair":"EURUSD"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/fx-tick first.

Call when an agent needs current perpetual funding for one symbol or a fixed major list. Tries Hyperliquid and Binance USDT-M futures, then OKX and Bybit. Includes next funding time and mark or index when the venue returns them. A geo-blocked venue is skipped. Send JSON {"symbol":"BTC"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/perp-funding-rates first.

Call when an agent needs a spot order-book snapshot with best bid, best ask, mid, spread, and spread in bps. depth defaults to 20 and is at most 100. Tries Coinbase Exchange, Kraken, OKX, then Binance. Send JSON {"symbol":"BTC-USD","depth":2}. Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/crypto-orderbook first.

A concise evidence-based view of one selected Polymarket question with probability, market quality, invalidation, limitations and provenance.

Call when an agent needs the x402 networks this deployment settles, with chain ids, USDC addresses, payTo, and the facilitator URL. Reads local gateway config only. No outbound call. Send JSON {}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/x402-network first.

Call when an agent needs the catalog USDC price for one AgentShelf slug, in USD and atomic units, plus the active network and payTo. Reads local config only. No outbound call. Send JSON {"slug":"fx-tick"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/x402-quote first.

x402engine — Pin JSON, files, or URLs to IPFS for decentralized storage

Find the email address from a LinkedIn profile URL.