"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.

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

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

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.

Bank and lender monitoring with historical-evidence limits and eligibility flags beside every claim.

See what actually settles on x402: wash-adjusted volume, payTo checks. Free, no key, no signup.

Malaysian SME accounting, e-Invoice and payroll books for your AI. 41 tools — business snapshot, P&L, balance sheet, A/R and A/P aging, cash forecast, stock, tax position, document search — plus draft-only writes (invoice, quote, receipt, bill, expense, contact, bank statement import). Every write is a pending draft a human approves in Taokeh; it can never post, edit or delete. Remote Streamable HTTP at https://taokeh.my/mcp, OAuth 2.1 or a personal access token.

Reviewed competitor pricing, offer comparisons, and market-change evidence with x402 payments.

530 MCP tools across 561 fintech tools: ChainGraph AP2 decisions, execution_hash. Zero PII.

Savvly MCP: query fund data, model projections, and compare against alternative retirement products.

Curated, probe-verified directory of paid x402 APIs. Agents check it before spending money.

AgentFeed: 47 tools — our own liquidation tape + tokenized-equity peg data, paid in USDC.

Taiwan stock market data (TWMD): official-source, point-in-time-safe datasets via read-only tools.

Ready for a new way to bill pay? Pay any US bill in a snap, right from your AI assistant. Describe or snap a photo of your bill (electric, water, gas, internet, phone, medical, credit card, rent, parking tickets, traffic violations and more) and Papaya reads it, then hands you a secure link to pay by card. Fast, secure, and no juggling twelve logins, with full or partial payments and status updates. Available in the US only. Powered by Papaya (papayapay.com).

SEC/XBRL issuer intelligence for crypto public companies via MCP, OpenAPI, x402, and MPP.

Pay any US bill in a snap, right from your chat — utilities, medical, rent, parking tickets & more.

Teardrop is the native economic layer for AI agents, providing a robust suite of tools for multi-chain portfolio tracking, DeFi yield analysis, and gas estimation. It enables autonomous agents to securely find Web3 data and manage micro-payments on-chain with zero human intervention.

Deduplicated, entity-resolved funding rounds, acquisitions, and exec moves as MCP tools.