"Understanding Call Hierarchy in Software Development or Programming" matching MCP servers:

Enables an autonomous agent wallet on Base to make payments, approve tokens, swap on Uniswap V3, Aerodrome, 0x and CoW Protocol, lend/borrow via Aave V3 and Morpho Blue, trade perps on Hyperliquid, and enforce risk policies via blacklists, caps, simulation, and audit logs.

Enables AI-powered cryptocurrency trading and analytics across multiple exchanges and blockchains, with integrated Telegram bot and live trading capabilities.

Pay-per-call x402 data products on Base mainnet — sanctions screening, aviation weather, mortgage rates, US property dossier, title chain, wallet balance, and agent session auth. Every call settles in USDC with an on-chain receipt, no accounts or API keys.

An MCP server that mints STAS, DSTAS, and BSV-21 tokens into a BSV Desktop wallet in seconds, enabling rapid token testing and development.

Lets AI agents discover, pay for, and call any HTTP API per request using USDC, with gasless nanopayments and no API keys or accounts needed.

A Model Context Protocol server that gives any MCP client two economic-safety tools: realizable quote and pretrade check, paid per call in USDC with no accounts.

Open-source MCP server exposing the Agent402.Tools catalog: 500+ deterministic pay-per-call tools for AI agents, including browser rendering, web search, PDFs, OCR, LLM inference, code execution, live financial/crypto/macro data, SEC EDGAR, and wallet-keyed memory. Free via proof-of-work, or pay per call in USDC across ten chains via the x402 protocol. No API keys, no signups

Cross-sectional funding-carry rankings for Hyperliquid perpetual futures, metered per call in USDC via x402 on Base.

MCP server that gives autonomous agents pay-per-call Bitcoin context (self-custody radar, fee percentiles, price change windows, condition frequencies) paid in sats over Lightning via L402 invoices, with no account or API key required.

19 pay-per-call APIs for AI agents via x402 USDC micropayments on Base — prediction markets (Polymarket, Kalshi), DeFi/crypto data, multi-chain on-chain reads across 5 EVM chains, live weather, and real-time web search. No API key or signup — from $0.001/call. npx -y microtap-mcp

Enables AI agents to access crypto/web3 data across 5 chains with pay-per-call billing in USDC via x402, no API key required, and built-in spend caps.

Enables Claude to call US government and freight APIs via SuVerse's pay-per-call gateway, automatically paying in USDC on Base from a funded wallet.

Provides AI agents with real-time Solana data and agent-swarm intelligence as tools, with auto-paid per-call micropayments in CIRC via x402.

Enables AI agents to pay USDC per call for Asia market intelligence data via HTTP 402 protocol, no API keys or subscriptions required.

x402 capability chassis: 170+ AI-callable, pay-per-call data tools (US/global equities, crypto/DeFi, prediction markets, gov/legal, research, infra) settled in USDC on Base mainnet via the Coinbase CDP facilitator. No API keys or accounts — the x402 payment is the auth. Remote MCP at https://the-stall.intuitek.ai/mcp.

Pay per MCP tool call in USDC on Base. Non-custodial settlement, no admin keys, 30 bps fee.

Marketplace MCP for paid HTTP APIs. Pay per call in USDC on Base via the open x402 standard — non-custodial. 13 tools for discovery, buying, and publishing APIs.

Lets AI agents fetch live gas prices across multiple EVM chains, compare USD transfer costs, and find the cheapest chain in a single call, with pay-per-call billing via x402.

Discover, pay for, execute, and publish monetized APIs directly from your agent, settled per call in USDC over x402, through the Model Context Protocol.

Batch send SOL or any SPL token to 1000+ Solana wallets in one call. x402 payment protocol for AI agents.