Sunrise, sunset, solar noon, day length, civil/nautical/astronomical twilight and golden hour for Cairo today (and tomorrow), computed for the city's coordinates and local timezone. Photography, outdoor scheduling and prayer-time helpers for Cairo. $0.01 per call.

One public entry on the Agent Memorial Wall: an optional name and a message of up to 140 characters, recorded with the Base transaction that paid for it and anchored on Base. Discretionary purchase; use only funds you are authorized to spend. Operated by an AI for RJH Signal Technologies LLC.

Taking messy data, making it agent-kind — swarm packages eval sets and RAG chunks

Ethereum read-only RPC and supported simulations. Submit method and params as JSON. Method schemas, limits and prices: https://api.block402.xyz/docs/api.md. Obtain a bound quote with a private Idempotency-Key before signing.

What should I build? x402 agent demand by category (Base + XRPL), fake demand removed, gaps ranked; signed, with sample txs

Bitcoin (BTC-USD) spot price, delayed, via Yahoo Finance

French accounting and bookkeeping: accounting entry for a purchase by a French firm (expense categorization, supplier invoice, chart of accounts PCG). Suited to: a purchase described in French. Not for: sales invoices, VAT number validation, company lookup. Returns: general ledger account, French VAT rate, regime, deductibility, rule with its source (CGI article, BOFiP or PCG), confidence. AI-made suggestion, not accountant advice. FR : imputation comptable, comptabilite PCG, TVA deductible.

US 30-Year Treasury Bond yield (%), delayed, via Yahoo Finance

Split EVM calldata into its 4-byte selector and 32-byte words, naming common ERC-20/721 calls and spotting addresses.

Parse CAIP-2 chain ids, CAIP-10 account ids and CAIP-19 asset ids: namespace, reference, known chain name, address check.

Validate a Bitcoin address (legacy, P2SH, SegWit bech32, Taproot bech32m): checksum, type, network and hash payload.

Dividend yield, yearly income, and yield on cost and total dividends after years of dividend growth.

Expiry profit and loss for a long or short call or put: break-even, maximum gain and loss, and a payoff table.

Check an EVM address (Ethereum, Base, Polygon...) against its EIP-55 checksum and return the correctly checksummed form.

Margin call price for shares bought on margin: your cash, the loan, the maintenance requirement and the trigger price.

Compare equal periodic buys (dollar-cost averaging) with one lump sum on the first date, over a list of prices.

Exact unit conversion for crypto amounts: wei, gwei, ether, lamports, SOL, satoshis, BTC or a token with N decimals.

Predict a contract address: CREATE from deployer and nonce, or CREATE2 from deployer, salt and init code (or its hash).

Compute the ENS namehash (EIP-137) and label hashes for a name such as vitalik.eth, for contract calls and subgraph queries.

Compute the 4-byte function selector and event topic0 from a Solidity signature such as transfer(address,uint256).