"Services or tools that don't require a separate API key" matching MCP connectors:

Polymarket, Manifold, Metaculus compared: one fair probability per question. No API key needed.

Sports betting odds, de-vigged to true win probabilities. Soccer, NFL, NBA + 10 more. No API key.

Australian AI governance framework mapped to the Privacy Act and sector laws your AI use triggers.

500+ pay-per-call tools + skill packs. USDC + USDG on 12 chains, or free via proof-of-work.

DXF and PDF/X-4 for AI agents: structured facts, PNG renders, an interactive in-chat viewer.

Reference data for prediction markets: graded resolution clarity, cross-venue links, provenance.

Neutral freight reference + validation layer for AI agents: ADR, HS, UN/LOCODE, freight math

Read-only MCP server for the OrchestKit docs: full-text search + Markdown fetch. No auth.

Analytical memory for AI agents: a real Postgres queried in plain English over MCP. One command.

Exit-cost estimates, depth concentration, liquidity tiers, and sealed records; no commodity futures.

Read-only breach intel, full history 2007-today: reports THAT an org was breached, never the data.

Fourteen paid x402 and MPP tools for web data, payment preflight, audits, DeFi, and work discovery.

AI-agent image generation: cohesive sets & illustrations. PNG/WebP (optional transparency) or JPEG.

SSRF-safe web intelligence: 4 outcomes, 43 paid x402 tools, 3 free tools and a URL preview.

The Brain Layer for AI Trading Agents — quant calls + cross-venue arb across perp venues via MCP.

US funding-stress warning with construction-PIT evidence limits and explicit eligibility flags.

Free real-estate underwriting, no key or account. 6 strategies, stress tests, max offer.

Scan code for quantum-vulnerable cryptography and get NIST post-quantum migration guidance.

Diagnoses, drugs & lab codes: ICD-11, SNOMED, LOINC, RxNorm, MeSH, ATC, CID-10. 37 tools, MIT.

Read-only MVR preflight for trust, permission, evidence gaps, and African market-entry readiness.