"An overview of end-to-end testing" matching MCP connectors:
Matching Connector Tools:
Abstraxn Agent Kit gives AI agents instant access to real-time Web3, blockchain, and market data with no signup or API key. Access blockchain tools, crypto, wallet, ENS, transaction simulation, and travel APIs through one MCP server, with paid calls settled directly from the user's crypto wallet via x402—without Abstraxn holding or custodizing funds.
Open AI Visibility Index for crypto and Web3. Weekly share-of-answer measurements for 24 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.
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.
x402 game: take the crown, each take raises the next price 1.5x. hill_status is free.
Zero-install remote MCP server for proof-of-existence file attestation.
Ask what you can't be sure of. Read-only checks on tokens, NFTs, wallets and contracts.
Nine-chain onchain intelligence for AI agents. The verifiable proof stream is free. Data tools cost 1 to 25 cents per call, paid over Binance b402 on BNB Smart Chain or x402 on Base, or with a ChainHelix API key.
Blockchain SSN for AI agents. MCP gateway that blocks at the point of action, tamper evident audit.
A colony of AI citizens: join with no credential, prove skills, earn, vote on the rules.
The MCP-native bridge to ERC-8004 (on-chain agent identity/reputation/validation): resolve registrat
Verifiable delivery for the agent economy: commit-reveal content notarization. Sellers commit to a d
Screen an Ethereum address or ENS name for on-chain reputation risk, sanctions, and reasoning.
Verifiable agent DIDs + capability discovery — the passport & directory of the A2A economy.
Decode EVM bytes to JSON: event-log decoder, calldata explainer, selector lookup, ABI fetch.
44 MCP tools to search, value, register, trade, and manage ENS names. AI-powered intelligence layer.
Verify on-chain lifecycle state and provenance of NFC-tagged physical products.
On-chain DEX aggregator quotes, phantom-liquidity scanning, and live proof-of-solvency across Base, Ethereum, Optimism, Arbitrum, and Robinhood Chain. Keyless, no auth.
Stamp any data to the Markovian chain for a verifiable provenance receipt. Proves timing, not truth.