"How to obtain an API key" matching MCP servers:

Enables agents to access live DeFi, social intelligence, risk, and API documentation tools with a caller-supplied API key.

Free DEX aggregator API that returns executable swap calldata across 46 EVM chains. No API key required. Single GET request returns ready-to-sign transactions for any token pair.

Live liquidity-pool scores for Solana + EVM: Enter/Hold/Exit verdicts and a composite 0-100 Wealthville Score, backed by a public, immutable track record that includes misses. Read-only, free, no key required. Data product, not financial advice.

Provides MCP tools to query Etherscan for Ethereum blockchain data—ETH balances, ERC-20 tokens, transactions, contract ABIs, and gas prices—without requiring an API key.

Enables AI agents to discover Cardano DeFi venues, fetch cross-chain swap quotes into ADA, read balances and positions, and obtain unsigned transactions for the agent to sign with its own keys.

Provides cross-chain bridge and swap tools for AI agents using the Relay Protocol to interact with multiple blockchain networks. It enables agents to query supported chains, obtain transaction quotes, and generate unsigned transaction data for token transfers and swaps.

Enables blockchain AML screening of addresses in plain language inside any MCP client, covering sanctions and freeze checks, risk scoring, fund tracing, and counterparty classification across bitcoin, ethereum, bsc, and tron. Works without an account, with an optional API key that lifts rate limits and unlocks outgoing tracing.

Compare real-time gas prices across up to 9 EVM chains and get the cheapest-chain recommendation. Pay-per-call via x402 (USDC on Base). No API key.

Provides live market and account data from Hyperliquid, including perp and spot prices, funding rates, open interest, order books, and wallet positions, without requiring an API key.

Drafts and deploys a coin from your repo to pump.fun's bonding curve on Solana, with local key management and fee recycling into an agent budget.

Live verifiable on-chain data for the $BOBAI token on BNB Chain: price computed from pair reserves × Chainlink (no price API), liquidity depth with LP-burn proof, buyback-and-burn audit trail, and fee-on-transfer-safe trade params. 13 read-only tools + 2 guided prompts, no API key.

Enables AI agents to obtain non-custodial Solana-to-Base quotes, verify signed manifests and status, and prepare or verify unsigned execution plans without handling private keys or submitting transactions.

Shumi is a mechanical trading intelligence platform designed for the crypto market. It combines market trends, funding data, user sentiment, and contract resolution into a single research workflow.

Enables AI agents to analyze price action using Smart Money Concepts (market structure, order blocks, fair value gaps, liquidity sweeps) for stocks, forex, gold, indices, and crypto without an API key.

MCP server for pay-per-call DeFi and crypto data via x402 micropayments on Base. 8 endpoints: token prices, TVL, funding rates, token security, gas tracker, whale monitoring, wallet profiling, and yield scanning.

Blockchain JSON-RPC on 23 EVM chains for AI agents — Ethereum, Base, Arbitrum, plus young chains like Robinhood Chain, Plasma and Ink. Free reads with no key; heavy methods (eth_getLogs, trace, debug) via a free API key or x402 USDC pay-per-call.

Enables agents to purchase VPN access by locally signing and broadcasting x402 USDC payments on Solana or EVM, then fulfilling payments to obtain and save credentials.

Non-custodial crypto swaps for AI agents: Solana (Jupiter) + 7 EVM chains (KyberSwap), 1288+ assets, cross-chain routing, priority-fee oracle, Hyperliquid perps. Returns unsigned transactions — your wallet signs, no API key, no KYC. Hosted at https://swaptitan.net/mcp

MCP server for querying cryptocurrency portfolio data, transaction history, net worth, and historical snapshots across 20+ blockchains via the Octav API.

Enables AI agents to fetch real-time exchange trading fees, compare rebate-adjusted costs, obtain referral links, calculate trading costs, and identify compliant exchanges for crypto trading.