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

Full trust report for an x402 endpoint: score breakdown, current quote, wallet/price events, and paid delivery checks. For teams: per-agent spend limits, signed receipts, and an audit trail at lumierepaycheck.org/subscribe.

Use before paying any x402 endpoint, so you don't pay a dead or mispriced one: checks it is alive, correctly payment-gated, its price/network/asset, latency, and whether it fits your max_price_usd. Sends one unpaid request, never pays. ~9% of paid listings we scanned were dead. Errors (never charged): 400 bad input, 422 source could not be fetched or parsed, 429 rate limited (30/min), 502 upstream failed.

UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcharges.

Amazon Search API: Give a product query, get Amazon listings with ASIN, price, and rating. $0.003 USDC per call on Base.

Use this chronological feed of new forecasts and newly linked articles/X posts across Quotient-covered Polymarket International, Polymarket US, Kalshi, and HL Outcomes listings. Events include canonical venue routing, response-time venue odds with quote provenance, compact forecast context, and thesis, but omit resolution_pathway; use market detail for full rules context. The complete window avoids per-market fan-out.

Wallet-risk check before paying any wallet: OFAC sanctions screening, whether it's a monitored x402 seller's payout wallet and how long it's been stable, recent unconfirmed payout-wallet switches to it (possible hijack), seller declarations, x402 payment history, and on-chain intelligence (first funder, one step back, wallet age and activity). Add compare=<other wallet> for same-owner evidence and a 0-1 confidence. Verdict: clear, caution, or block.

Real-time cryptocurrency spot price in USD, aggregated as the median across Coinbase, Binance and Kraken with cross-exchange spread. Supports BTC, ETH, SOL. Deterministic multi-source aggregation for trading and treasury agents.

What changed in AI: newly released models and API price changes across providers (detected by comparing editions), a current LLM price sheet in $ per million tokens with context lengths, the trending open models, the most upvoted new research papers, and the AI stories on the Hacker News front page. Rebuilt every hour. $0.01 per call, no account. Free 24h-delayed sample: GET https://ioswarm.io/api/v1/feeds/ai/sample.

Reloadpi — Search gift cards and vouchers from 5000+ brands across 150+ countries

The most-traded prediction markets right now on Polymarket and Kalshi, ranked by 24-hour volume: the market-implied probability for each outcome, its 24-hour change, volume, liquidity and close date, with links. One call instead of paging two exchanges' APIs. Rebuilt every hour. $0.01 per call, no account. Free 24h-delayed sample: GET https://ioswarm.io/api/v1/feeds/prediction-markets/sample.

AI-generated standard research report (Open Research Agent)

One attention snapshot: Google's trending searches in the US with traffic estimates and the stories behind them, the most-read Wikipedia articles (yesterday), today's trending GitHub repositories with stars gained, and the Hacker News front page with points and comment counts. Rebuilt every hour. $0.01 per call, no account. Free 24h-delayed sample: GET https://ioswarm.io/api/v1/feeds/trending/sample.

Rent a disposable VPS via x402. Pass `sku` from GET /catalog (e.g. server_small_1mo). Pay-on-success: USDC settles only when the box is reachable on TCP :22 (provisioning takes 3–5 min). Failed provisions never settle — the EIP-3009 authorization expires unused, agent pays nothing. Returns {rental_id, ipv4, expires_at, root_token, status}. Renewable via POST /rentals/{id}/renew. Servers: 30-day or 365-day, $14.99–$449.99, 4–8 vCPU / 8–24 GB RAM / 100–300 GB SSD, 200–600 Mbit/s unmetered.

Clean page extraction. Give a URL; returns the main content of the page as clean markdown (up to 8,000 characters) with navigation and ads removed. Typical response 2 to 5 seconds. If the page cannot be read you get an error and are not charged.

Returns current signal scores for BTC, ETH, SOL, XRP, and ADA plus a ranked top_k list, regime, and data freshness — use it as a lightweight crypto market snapshot before deeper analysis. Typical agent tasks: get a quick Bitcoin market read, check which of the top 5 coins is strongest right now, add a fast pre-trade signal check to a trading loop, or pull a crypto pulse for a research summary. Fresh continuously, served as JSON over x402 with USDC on Base mainnet.

Get the firm quote for a swap using Allowance Holder to set allowances

Phone number intelligence: E.164 normalization, validity and plausibility, geography, timezone and current local time, plus carrier of record, line type (mobile/landline/VoIP) and in-service possibility for US numbers.

Add/subtract, count or find business days across countries and subdivisions; list public holidays. Bundled 2024–2030 calendars, inclusive ranges, explicit weekends and closures, source attribution and coverage warnings. See /calendar/coverage.

Change stream for PDUFA dates a company put in an SEC filing: every set, extension and resolution of every tracked catalyst, with the outcome (approval or CRL), the filing quote and its EDGAR source, as a since-cursor feed. Use when you mirror those disclosed dates and need changes as they land, not a snapshot. Accuracy and coverage are free at GET /v1/accuracy. Flat price per request.