x402engine — Anthropic's previous-gen Opus — strong reasoning and creative writing, large context window

x402engine — OpenAI's maximum-compute GPT-5.6 tier for the hardest agent tasks

x402engine — Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual

x402engine — Google's Gemini 3.1 Pro Preview on the Gemini Pro compatibility route — advanced reasoning, coding, and multimodal understanding

x402engine — Google's latest flagship — advanced reasoning, coding, and multimodal with extended thinking

x402engine — Anthropic's latest Opus model — premium analysis, coding, and long-context autonomous work

x402engine — Anthropic's balanced model — excellent coding, reasoning, and creative writing

x402engine — Anthropic's most powerful model — best for complex analysis, coding, and extended thinking

x402engine — OpenAI's reasoning model — excels at math, science, coding, and multi-step problem solving

x402engine — OpenAI's unified flagship model — 1M context, computer use, top-tier across all tasks

x402engine — OpenAI's balanced GPT-5.6 tier for advanced reasoning and agent workflows

Check if a specific date is a business day in a given country. Accounts for weekends and public holidays. Also returns the next business day if the given date is not one.

x402engine — OpenAI's premium reasoning model — extended thinking for complex math, science, and coding problems

Run code in an isolated cloud sandbox and get its output — agents can't self-host this. POST {code, language?}. language: python (default), javascript, bash, r, java. Returns stdout, stderr, results, error. Hard-capped: 25s wall-clock, 100KB code, 64KB output, fully isolated.

Real-time sea state at GPS coordinates — wave height, period and conditions for maritime routing — Ed25519 signed attestation

Xynaptic Skill — Supplier Due Diligence (France): the complete step-by-step method to vet a French supplier before contracting, as an agent-executable SKILL.md. Covers the 5-call chain (identity, KYB, compliance screening, financials, press) with a decision grid, thresholds, and red-flag abort rules. The skill text is returned in skill_md; underlying data calls are paid separately via x402. GET no params.

Top trending tokens by search volume and social activity

Live prediction-market odds. source=polymarket (default) or kalshi. Polymarket: top active markets by 24h volume with outcome prices. Kalshi: open markets with yes/no bid-ask. Query: source, limit (1-50, default 20). Use for event probabilities, news signals, and cross-market arbitrage scans.

Foreign-exchange rates for 30+ fiat currencies (ECB reference data). Query: base (3-letter code, default USD), symbols (optional comma list, e.g. EUR,GBP,JPY), date (optional YYYY-MM-DD for historical rates back to 1999). Returns {base, date, rates}. Use for currency conversion, international pricing, and FX monitoring.