Payments

Otto AI hosted MCP: 16 pay-per-call market-intelligence tools, USDC via x402 on Base, no API keys.

One search across every agent registry: 100K+ MCP/A2A/x402 services, signed receipts.

Cash-pay lab tests: catalog search, all-in quotes by state, draw sites by ZIP, reviewed ranges.

US federal holidays, business-day maths, invoice due dates and IRS deadlines.

Smart contract audit oracles, Solana risk analysis, MEV defense & HTTP 402 verifiers.

Treasury and risk controls for agent wallets: policies, quotes, prediction-market orders.

Cálculos e regras financeiras do Brasil com fonte e vigência em cada resposta.

Processor fees, charge-to-net, invoice totals and proration. 3 of 6 tools free.

Post-tx outcome verification via LLM-as-judge. Zero Core Verify.

Verify Polish companies by NIP/KRS/REGON + EU VAT (VIES). 14 MCP tools (9 no-key).

Find, inspect and install reviewed reusable AI-agent capabilities from superskill.sh.

SEO data for AI agents: keyword volume, Google results, App Store keywords, domain and name checks.

Pay-per-call browser rendering and x402 marketplace ranking for AI agents, billed via USDC.

OpenStreetMap queries, maps/styles, search, routing, terrain, analysis, pipelines, and rendering.

Cryptographic proof of existence for AI agents. x402 on Base or Solana, NEAR anchored. Free tier.

Track product prices and get drop alerts - history, watches and pending alerts.

Wallet trust scores for AI agents. Stellar, XRPL, EVM 81+ chains. OFAC sanctions. x402 payments.

Universal HTTP 402 Micropayment Protocol & Autonomous Economic Settlement Engine for AI Agents

Verify and settle x402 stablecoin payments; browse the PayAI Bazaar of x402-payable resources.

Pay less for x402 APIs: free pre-payment checks, cheapest working service finder, web/PDF reader.