Primev infrastructure for Claude Code agents — preconfirmed transactions, gasless swaps, and agentic USDC payments on Ethereum.
claude plugin add primev/claude-plugin3 skills + 1 MCP server that give your Claude Code agent native access to Primev infrastructure.
| Skill | Description |
|---|---|
| mev-commit | Send preconfirmed transactions through FAST RPC. Drop-in Ethereum JSON-RPC replacement with sub-second builder commitments and guaranteed inclusion. |
| fast-protocol | Execute instant token swaps on Ethereum. Gasless ERC-20 swaps via EIP-712 signed intents, or direct ETH swaps through FAST RPC. Settles on Uniswap V3. |
| x402 | Agentic USDC payments over HTTP. Sign EIP-3009 authorizations, settle payments through the facilitator, and build pay-per-call APIs using HTTP 402. |
The plugin registers primev-fastrpc as a stdio MCP server that wraps mev-commit's FAST RPC and x402 facilitator endpoints as native MCP tools. No API keys required — all endpoints are public.
9 tools available:
| Tool | Description |
|---|---|
eth_blockNumber |
Get current Ethereum block number |
eth_getBalance |
Get ETH balance of an address |
eth_gasPrice |
Get current gas price |
eth_getTransactionReceipt |
Check transaction status |
eth_sendRawTransaction |
Send a preconfirmed transaction |
eth_call |
Read-only contract call |
eth_chainId |
Get chain ID |
x402_supported |
Check supported x402 payment assets |
x402_verify |
Verify an x402 payment on-chain |
The MCP server runs locally via stdio — Claude Code spawns it as a subprocess. It makes HTTP calls to https://fastrpc.mev-commit.xyz and https://facilitator.primev.xyz on your behalf. No costs, no rate limits.
After installing, your Claude Code agent can:
- Send preconfirmed transactions: "Send 0.1 ETH to 0x... through mev-commit"
- Check balances: "What's my ETH balance?"
- Swap tokens instantly: "Swap 1 WETH for USDC using Fast Protocol"
- Pay for APIs with USDC: "Access this x402-protected API endpoint"
- Query chain state: "What's the current block number and gas price?"
MIT