Every agent-payable API.

Is this email address worth sending to? Syntax, domain DNS (MX, then A/AAAA), disposable/role/free-provider lists, a typo suggestion (gmial.com -> gmail.com), a normalized form and a risk verdict with reasons. No SMTP probe: it vouches for the domain, never the mailbox. An invalid address is a paid verdict; a DNS failure is 502, not charged. Pay-per-call via x402. An empty body is answered for the published example address (name@example.com); send {"email":"…"} for any other address.

Read any public web page as clean text: title, description, canonical URL, the readable body with scripts, styles and navigation stripped, the first 50 links resolved to absolute URLs, and a word count. One URL in, up to 100,000 characters out; redirects are not followed, and a page with no readable text (JavaScript-only) is 422 and not charged. Pay-per-call via x402. An empty body is answered for the published example page (https://example.com/); send {"url":"https://…"} for any other page.

Hyperliquid perpetuals in one call: mark/oracle/mid price, 24h change, funding rate and its annualised APR, open interest in coins and USD, 24h volume, max leverage - plus the same coin's next funding on Binance and Bybit for cross-venue comparison. Name a coin (BTC, ETH, SOL, HYPE…) or send {} for the most-traded markets. Pay-per-call via x402.

USDC balance of any address on Base — the x402 settlement asset (atomic + USDC). Pay-per-call via x402.

Transaction status on Base — success/failed, block, confirmations, gas, from/to. A pending/unknown tx returns 404 (not charged). Pay-per-call via x402. An empty body is answered for the latest transaction on Base (read live from the chain head); send {"txHash":"0x…"} for any other transaction.

What a Base address holds: the ETH balance read from the chain, every ERC-20 with its balance, market price and USD value, and a USD total - spam tokens imitating real ones are flagged and left out of the total, unpriced tokens listed but not counted. Send {} for the paying wallet. Pay-per-call via x402. An empty body is answered for the wallet that pays (the payment's signer); send {"address":"0x…"} for any other address.

Stablecoin intelligence — circulating supply, $1.00 peg deviation and per-chain breakdown (incl. Base) for USDC and other stablecoins (DefiLlama). Pay-per-call via x402.

The latest crypto headlines from nine newsrooms (CoinDesk, Cointelegraph, Decrypt, The Block, Blockworks and more) in one call, newest first, duplicates merged - each with its link, source, time and a short summary. Filter by keyword and time window. No match is 404 and not charged. Pay-per-call via x402.

Live Polymarket markets: each outcome's price (the market's implied probability), 24h and total volume, liquidity, closing date and link. Search by topic (bitcoin, fed rates, election…) or send {} for the markets with the most 24h volume. A search with no open market is 404 and not charged. Pay-per-call via x402.

Everything about a domain in one call: registrar, creation and expiry dates and age from the registry's own RDAP, live DNS (A/AAAA/MX/NS), email authentication (SPF, DMARC policy) and the TLS certificate it serves (issuer, validity, days left, whether it covers the name). Pay-per-call via x402. An empty body is answered for the published example domain (example.com); send {"domain":"…"} for any other domain.

Base latest block number + timestamp — a chain-head freshness probe. Pay-per-call via x402.

Find academic papers in any field - title, authors, year, venue, DOI, citation count, open-access link and abstract - from OpenAlex (~250M works incl. arXiv and PubMed; Crossref answers if OpenAlex is down). Filter by year range and open access; sort by relevance, citations or date. Send {} to search the published example query. A search with no result is not charged. Pay-per-call via x402.

Token safety & rug check — on-chain honeypot/tax/owner-privilege/holder-concentration risk verdict for any EVM token (GoPlus + DexScreener). Pay-per-call via x402.

Tokens that just appeared or are being promoted right now - DexScreener's new token profiles, community takeovers and paid boosts - each with price, liquidity, 1h/24h volume, buys/sells, price change, market cap and pair age from its most liquid pair. Filter by chain (default every chain), list and minimum liquidity ($10k default); sort by volume, liquidity, change or newest. Send {} for every chain. A boost is paid promotion. Pay-per-call via x402.

The x402 market by seller over the last 30 days: estimated revenue, paid calls, paying wallets, calls per payer, median price, networks and each seller's top resource - from Coinbase's public x402 discovery index, read hourly. Rank by revenue, calls or payers; filter by keyword and network; a payer floor (default 3) drops lone testers. Send {} for the top 20 by revenue. Pay-per-call via x402.

Token report — price + liquidity + full safety verdict for any ERC-20 in ONE call (DexScreener + GoPlus). One payment instead of chaining token_price + token_safety. Pay-per-call via x402.

Technical SEO audit of a public page as a crawler first sees it: indexability, robots.txt, title and description length, canonical, viewport, headings, alt text, links, Open Graph, JSON-LD, mixed content, redirects, speed and the sitemap - each finding with a severity, plus a 0-100 score. JavaScript is not run. Pay-per-call via x402. An empty body is answered for the published example page (https://example.com/); send {"url":"https://…"} for any other page.

The latest Sentinel-2 satellite images of any point on Earth - date, cloud cover, tile, a JPEG preview link and the full true-colour image (10 m per pixel, Cloud-Optimized GeoTIFF) - newest first, under a cloud limit (default 30%) within a look-back window (default 60 days). Copernicus open data via Earth Search; the required attribution is included. Send {} for the published example point. No scene is not charged. Pay-per-call via x402.

Pay-per-call: Stablecoin Supply Tracker — Leading Market Indicator

Pay-per-call: Webhook/JSON Repair

Pay-per-call: Money Bot Research Brief

Pay-per-call: Webhook/JSON Repair

Pay-per-call: Arbitrum Token Risk Analysis

Pay-per-call: Cross-Chain Capital Flow Analyzer

Pay-per-call: Agent Skill Supply-Chain Risk Scan

Pay-per-call: Agent Skill Scanner Consensus

Pay-per-call: Codex Retry-After Validator

Pay-per-call: MCP schema lint

Pay-per-call: MCP/API Error Rescue

Pay-per-call: Crypto Price Feed — Multi-Asset Real-Time

Pay-per-call: x402 Checker — paid 402 report

Pay-per-call: Bitcoin Network Stats — Live Block Data

Pay-per-call: Dorothy Witness — Verify Before Retry

Pay-per-call: Mythos Multi-Chain Gas Tracker

Pay-per-call: Escrow-Verified Agent Work Radar

Pay-per-call: DeFi Lending Yields

Pay-per-call: Mythos Agent Toolkit

Pay-per-call: Mythos MCP — 300+ Pay-Per-Call Tools

Pay-per-call: Base Address Reputation

Pay-per-call: Agent Input Guard — Prompt Injection & Agent Security

Pay-per-call: Signal Sprint Base Gas Price

Pay-per-call: Research brief (nano)

Pay-per-call: Gas Tracker

Pay-per-call: Signal Sprint Base USDC Balance

Pay-per-call: Codex Public Endpoint Snapshot

Pay-per-call: Signal Sprint Base Block

Pay-per-call: Base Block Head

Pay-per-call: Fiat FX Rates

Pay-per-call: Price Digest (public URL heuristic)

Pay-per-call: Feed/Sitemap Digest (public URL heuristic)