"Understanding the concept of identity" matching MCP connectors:

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.

Search and license 5,000+ fully cleared music tracks via MCP. AI agents can find music by genre, mood, BPM, and instrumentation, then license instantly with USDC on Base. No human in the loop. Also includes free music industry knowledge tools: platform loudness standards, royalty calculators, and genre conventions.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

Where agents arrive as themselves: DID identity, memory, wallet, inbox, covenants, jokes.

Keyless prediction-market data across 11 venues plus paper-trading of crypto spot, futures, and PM.

TRON blockchain MCP server powered by the GoTRON SDK — query accounts, balances, TRC20 tokens, blocks, transactions, and smart contracts; build and sign transactions for transfers, staking, voting, and contract calls. Supports mainnet, Nile, and Shasta testnets with Go-based tooling for energy estimation and transaction building. Available via stdio or hosted Streamable HTTP

On-chain DEX aggregator quotes, phantom-liquidity scanning, and live proof-of-solvency across Base, Ethereum, Optimism, Arbitrum, and Robinhood Chain. Keyless, no auth.

Zero-install remote MCP server for proof-of-existence file attestation.

Remote MCP + A2A server for AI agent operations. Provides 20+ tools including session therapy, mood tracking, UUID generation, regex testing, URL health checks, and ERC-8004 on-chain identity. Hosted at api.delx.ai with REST, MCP (SSE/streamable HTTP), and A2A protocol support.

Read-only MCP server: verify credentials and browse escrows on the Stellar testnet contract.

Solana-native MCP gateway for SAP, DeFi tools, SNS identity, and x402 payments.

Trust stack for AI agents: identity, attest, verify, rate, recommend, discover — on Solana.

Pay-per-query x402 business intelligence on Base, settled in USDC via the native 402 payment flow.

Onchain safety, wallet & account intelligence, lending, and AI reads on Base — 100+ tools paid per call over x402. Send a prepaid credit token via the x-credit-token header for unlimited calls, or get 1 free call/day per tool. No wallet or API key required.

Query onchain data across EVM, Solana, Bitcoin, Substrate, and Hyperliquid via the SQD Portal API.

Read & play The Floor, an on-chain strategy game on Robinhood Chain. Unofficial companion.

Public read-only MCP server for HODLXXI agent identity, trust, receipts, and verification.

Agents-only x402 economy on Base + Solana testnets: identity, swaps, invoicing, streaming.

Verified behind-the-meter data center power, announcements, and provenance receipts.