"Supabase (open source Firebase alternative)" matching MCP servers:

Non-custodial x402 MCP payment layer for AI agents — the open-source alternative to Vercel x402-mcp

Exposes fourteen read-only tools over the HEY Research public API, letting assistants look up Robinhood Chain projects, builders, shipped work, relationships and market context, with each answer tagged FACT, DERIVED or UNKNOWN and unmeasured fields omitted rather than zeroed. Runs over stdio or hosted Streamable HTTP, and gives no trade instructions.

Enables AI agents to securely use Open Agent ID credentials for signing requests, looking up agent data, and exchanging encrypted messages. It performs all cryptographic operations within the server process to ensure private keys are never exposed to the AI agent.

23 tools for AI agents working with Nostr Open source. No API key. No account. NIP-46 remote signing Publish notes, reply, react, repost Encrypted DMs (NIP-04 + NIP-44) Fetch events, profiles, social graph

An MCP server that records consented, attributed, paid-for receipts for open-source dependencies, settling per-call USDC payments on Algorand with on-chain attribution.

CheapestInference — unlimited flat-rate API for frontier open-source LLMs

A production-grade MCP server for Web3, enabling real-time multi-chain wallet execution, smart contract auto-compilation and deployment, token swaps, and asset hosting via Supabase.

MCP server for Pi Network that enables AI agents to query Pi chain data (balances, transactions) and verify user tokens, with optional payment sending that is off by default.

Enables static security audit of Solidity smart contracts by analyzing source code or deployed bytecode for vulnerabilities, providing risk scores and detailed findings.

Quick-scan a smart contract for rug, honeypot, or centralization risk before sending funds. It combines verified source, live on-chain state, and heuristic Solidity analysis to return a SAFE/CAUTION/HIGH-RISK verdict.

Enables cross-chain swap execution across 12 venues and 17 chains, including native Bitcoin as source or destination, with tools for quoting, execution, status, and health checks. No signup, API key, or protocol fee required.

Read-only MCP server for Sui blockchain analytics with 44 tools covering wallets, DeFi, NFTs, token prices, transactions, fund tracing, pools, staking, Move decompilation, and MVR name resolution.

Enables stdio-only MCP clients to connect to the Frantic bounty board, letting users post and fund bounties with Base USDC and outsource tasks to AI agents paid on accepted delivery.

On-chain investigation and analysis tools for Solana blockchain, enabling detection of wash trading, funding source tracing, holder concentration analysis, and MEV/bundle activity identification.

Provides local access to Aztec documentation, examples, and source code via cloned repositories, with optional semantic search for enhanced querying.

Read-only MCP server that enables natural-language queries about Solana NFTs, including ownership history, freeze/burn rights, marketplace sales and floors with source and currency, directly from the chain and marketplaces without sign-up.

MCP server exposing ATLAS research capabilities: live tokenized stock market data, on-chain source-of-truth reads, and published research atlases. Connects to MCP clients over stdio with no API keys required for public testnet endpoints.

Real-time perp market-data for AI trading agents — funding rates, funding-arb signals, open interest, volume, orderbook depth/slippage and oracle families across 25 venues, plus HIP-3 RWA coverage (tokenized stocks, metals, oil) that mainstream aggregators lack. x402-native pay-per-call (USDC on Base): one free funding screener tool + 11 paid tools with auto-pay.

Enables AI assistants to audit Solidity smart contracts for security vulnerabilities, fetch verified source code from block explorers, decode calldata, and estimate gas costs across major EVM networks.

MCP server for TaskMarket, an onchain marketplace, enabling agents to check market stats, list/open tasks, and prepare safe delegation commands without moving funds.