4,229 mods tagged Web3 and blockchain that install into Codex, measured the same four ways as everything else here: what each costs in tokens on every session, what a security scan found and why, whether it is the original, and what changed.
MCP server Claude CodeCodexCursor +2
Fail-closed execution and market-data layer for Polymarket CLOB V2: local signing, confirmed fills only, fee-correct math, working deposit-wallet (POLY1271) support. Runs locally from the pmquant Python package. Needs 11 environment variables to run.
MCP server Claude CodeCodexCursor +2
The OpenRouter for agent payments: budget router, idempotency, cost ledger, and multi-currency billing over x402. Runs locally from the tryx402 Python package. Needs 2 environment variables to run.
MCP server Claude CodeCodexCursor +2
8 CIPHER tools — Solana scan, breach check, Jito, FRED, Drift, repo health, more. x402-paid on Base. Remote server at cipher-x402-mcp.vercel.app.
MCP server Claude CodeCodexCursor +2
EuroRWA analyst: tokenized money-market fund signals, snapshots, analytics and alerts. Remote server at rwa-dashboard-gamma.vercel.app.
Skill Claude CodeCodex
Stack Bitcoin automatically on Celo with CompraBTC — a non-custodial DCA agent. Use this skill when a user (or your own agent wallet) wants to buy Bitcoin periodically without managing the execution: create a plan once on-chain and CompraBTC's keeper executes every installment, delivering WBTC straight to the owner's…
Skill Claude CodeCodex
Play a provably fair on-chain slot machine on Base. Pay 1.1 USDC per spin via x402 (no account, no API key), poll the result, and claim winnings gasless for 0.1 USDC. Randomness by Chainlink VRF 2.5, RTP 93%, max win 30x.
Skill Claude CodeCodex
Accept crypto payments (USDC, USDT and stablecoins) on Celo, Base, Arbitrum, Polygon and BSC with a no-auth REST API. Create an invoice with one POST, share a hosted checkout link, and confirm payment via polling or webhook. Use when a merchant or agent needs to charge in crypto, generate a payment link, sell…
daedalus/mcp-python-bitcoinlib
Skill Claude CodeCodex
MCP server exposing python-bitcoinlib functionality.
daedalusdevelopmentgroup/ddg-agent-payable-services
MCP server Claude CodeCodexCursor +2
Payment-aware MCP server + multi-framework SDK for DDG Agent-Payable Services (248 x402/direct-crypto services, OpenAI-compatible gateway). Runs locally from the ddg-agent-services-mcp Python package. Needs 2 environment variables to run.
MCP server Claude CodeCodexCursor +2
Live LP analytics — Uniswap V2/V3, Balancer, Curve stableswap: PnL, health, slippage, depeg risk. Remote server at mcp.echoledger.ai.
MCP server Claude CodeCodexCursor +2
Metered MCP tools: free discovery over MCP; per-call execution settled in USDC via x402 v2. Remote server at paid-mcp-metering-clsiojdd7-benlafreniere6-3913s-projects.vercel.app.
MCP server Claude CodeCodexCursor +2
Governed USDC wallet for AI agents — policy gates, spending caps, and Ed25519-signed receipts. Runs locally from the dingdawg-agent-wallet npm package.
dlrjsdl200-byte/mgo-mcp-server
MCP server Claude CodeCodexCursor +2
Find the cheapest EVM chain across up to 9 networks with savings %. Pay-per-call via x402 on Base. Runs locally from the chain-ops-mgo npm package.
MCP server Claude CodeCodexCursor +2
AI agent discovery, marketplace, messaging, and payments on Nostr — no platform, no middleman. Runs locally from the @elisym/elisym-mcp npm package. Needs 5 environment variables to run.
MCP server Claude CodeCodexCursor +2
Discover and trade tokenize-anything coins on hyde.trade (Robinhood Chain). Non-custodial. Runs locally from the hyde-mcp npm package. Needs 1 environment variable to run.
feedoracle/-feedoracle-mcp-risk
MCP server Claude CodeCodexCursor +2
7-signal stablecoin risk scoring. 13 tools, 28+ tokens, SAFE/CAUTION/AVOID verdicts. Remote server at feedoracle.io.
MCP server Claude CodeCodexCursor +2
DeFi data API for AI agents — pay-per-call via x402/USDC on Base. Runs locally from the @x402-api/mcp-server npm package. Needs 1 environment variable to run.
MCP server Claude CodeCodexCursor +2
Scans Base L2 smart contracts for security risks. Risk score 0-100, detects backdoors & proxies. Runs locally from the @fino314-oss/contract-scanner-mcp npm package. Needs 1 environment variable to run.
MCP server Claude CodeCodexCursor +2
MCP server for flat.cash — give your AI agent a treasury. Buy, hold, and transfer CPI-pegged FLAT with no wallet, no gas, no KYC. Runs locally from the @flatcash/mcp-server npm package. Needs 1 environment variable to run.
MCP server Claude CodeCodexCursor +2
Cryptographic receipts for AI outputs on Base or Solana via x402. Runs locally from the @forgemeshlabs/x402-notary-mcp npm package. Needs 4 environment variables to run.
Skill Claude CodeCodex
Complete guide for integrating @nibgate/sdk into a creator-owned site. Covers widget installation, resource definition, server gating, payments (Circle Gateway and direct USDC transfer rails on Arc mainnet and testnet), browser unlock UI, admin panel for managing gating settings, onchain reputation/ratings…
friendlygeorge/coingecko-mcp-server
MCP server Claude CodeCodexCursor +2
MCP server for CoinGecko cryptocurrency data API. Runs locally from the @supernova123/coingecko-mcp-server npm package.
friendlygeorge/etherscan-mcp-server
MCP server Claude CodeCodexCursor +2
MCP server for Etherscan — Ethereum blockchain explorer API for AI assistants. Runs locally from the etherscan-mcp-server npm package.
Skill Codex
Inspect and buy the Agent Commerce Guard 1 USDC Base launch pass through an authorized Base MCP wallet, x402 client, or browser wallet. Use when a user wants to evaluate the offer, confirm payment details, purchase the package, verify a Base transaction, or unlock the paid download. Require explicit approval before…