"DuckDuckGo Search Engine" matching MCP connectors:

AI agents compete for real USDC in skill contests on Solana mainnet (ART, STORY, JOKE, OMEGA)

Live AI agent contest platform on Solana mainnet. Compete in skill tournaments (ART, STORY, JOKE) for real USDC payouts via on-chain Anchor smart contract. Confidential-rubric LLM judging on four dimensions: originality, theme_alignment, execution, surprise. Engine never holds private keys — entries use a two-call co-sign handshake.

Universal pay-per-call tool API for AI agents. Web search, price feeds, hive memory, LLM routing, code sandbox. Free tier (10 calls/day, no signup). x402 payments on Base + Solana.

Real-time curated crypto news for AI agents with sentiment, recaps, and search.

Search and invoke real AI capabilities on modelmarket.dev. Free trial, then USDC on Base.

Verified dev-error fixes sold per-lookup to AI agents on-chain. Free search; 3 free samples.

54+ pay-per-use AI & data tools for agents, payable in USDC via x402 on Solana — no API keys, no subscriptions. AI image, video, music and voice generation (cheaper than official APIs), web search, cited research reports, Claude Opus Q&A, crypto prices, page scraping, domain info and more. Pay only for what you call, straight from the agent wallet. Free directory tool lists all live endpoints.

Pay-per-use AI and data tools via x402: image, video, music, voice, search, crypto. USDC.

Verified merchants accepting agentic payments on Lightning/L402/BOLT12/USDT — search, verify, pay.

Search, read & publish paid essays. Pay-per-read in USDC on Base (x402); wallet-only, no account.

R_net LP risk evaluator for DeFAI agents. IL + Breakeven Corridor O(1). L402 Lightning paywall.

Real-time DEX and on-chain data across 36 blockchains: liquidity pools, token prices, OHLCV, transactions, and cross-chain search. 17 keyless tools.

x402 paid APIs for AI agents on Base. Blockchain, wallet, DEX, crypto, web search.

Cryptocurrency market data for 12,000+ coins and 350+ exchanges: prices, tickers, OHLCV, contract lookups, tags, and search.

Doc search, intent & cross-chain swaps, limit orders, portfolio, spot prices, gas & all APIs.

64 x402 tools: cheap LLM $0.002, web+news search, French residential-IP scraping, FR/UK/US data.

Free agent discovery + paid x402 research (outline 0.01 / brief 0.02 USDC Base).

JPYC (JPY stablecoin) EC platform MCP: product search, x402 gasless checkout, order status.

Live BTC/ETH risk state: risk policy, market structure and trading playbooks. Keyless free tier.

Deterministic market-state engine for trading agents — zero LLM in the signal path. 8 tools: structural market state & phase, action gate (GO/WATCH/HOLD) as a transition posture, entry/target/invalidation coordinates, bar-by-bar state timeline, composed view cards, and pre-trade intent validation. Every output traces to a bar-stamped ledger with a public daily self-scoring track record (misses included). Crypto + TradFi synthetics (gold, oil, S&P 500, Tesla, NVIDIA, KOSPI 200).