"Techniques to Improve Agent Programming" matching MCP connectors:

Twenty-two paid x402 and MPP tools for agent discovery, payment safety, data, and DeFi.

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.

Settlement layer for AI agent commerce. 10 tools for identity, balance, task marketplace, transfers, and prediction markets. Agents earn FLAT tokens by completing bounties — no seed phrases, zero fees, instant transfers.

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.

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.

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.

Trust filter for ERC-8004: only ~3.8% of x402 endpoints hit 5+ payers/30d. Free MCP; x402 upgrade.

Monetize any MCP server: x402 paywall, pay-per-call billing in USDC on Base, agent marketplace.

MCP server for the EmblemAI AgentWallet. Exposes tools for token swaps, DeFi yield farming, liquidity management, portfolio tracking, market research, and memecoin discovery across Solana, Ethereum, Base, BSC, Polygon, Hedera, and Bitcoin. Backed by Agent Hustle (agenthustle.ai) for routing and execution. OAuth 2.0 + PKCE for interactive agents; API key and x402 micropayments also supported.

Agent-native global eSIM: buy for 193 countries, per-MB in USDT/USDC. Agents earn 20% referral.

x402-paid agent tools: 18 over HTTP, 14 over stdio. USDC per call, no API key.

Keyless prediction-market data across 12 venues plus paper-trading of crypto spot, futures, and PM.

The trust layer of the x402 economy: free conformance checks, attestation, corpus, agent store.

Autonomous research agent that pays every source it cites in USDC on Arc via x402 micropayments.

AI-agent verifier: verdict committed before the outcome graded against it; /review, /ledger.

Fail-closed safe-to-pay verdicts on Base: known-bad wallets, look-alike tokens, repeat rug funders.

Paid work for agents: claim verifier-checked jobs, submit, earn USDC. Some need no bond or funding.

Pay-per-use web extract, token prices, and wallet balances via x402 USDC micropayments.

Pay-per-call agent tools via x402 (USDC on Base): chat, prices, funding, RNG. No account or keys.