docs.primev.xyz

# Primev Documentation > Complete technical documentation for mev-commit, Fast Protocol, FAST RPC, and Fastx402 — Ethereum infrastructure for preconfirmations, instant swaps, and agentic payments. Primev builds core infrastructure for Ethereum's mev supply chain. The mev-commit protocol enables peer-to-peer preconfirmation commitments between bidders and block builders, providing sub-second transaction guarantees on Ethereum mainnet. ## Products - [FAST RPC](https://docs.primev.xyz/v1.2.x/developers/fast-rpc-api): Drop-in Ethereum JSON-RPC replacement at `https://fastrpc.mev-commit.xyz`. Transactions sent through FAST RPC receive binding preconfirmation commitments from block builders. Supports all standard `eth_` methods plus custom `mevcommit_` methods. - [Fast Protocol](https://docs.primev.xyz/v1.2.x/concepts/fast-protocol): Order flow auction (OFA) on top of mev-commit. Users receive at least 90% of mev their transactions generate. Redistributed as Fast Miles (tokenizable points). - [Fast Swaps](https://docs.primev.xyz/v1.2.x/concepts/fast-swaps): Token swap interface on Ethereum mainnet. Gasless ERC-20 swaps via EIP-712 signed intents through Permit2. Supports 2,400+ tokens. Settlement via FastSettlement V3 contract on L1. - [Fastx402](https://docs.primev.xyz/v1.2.x/developers/fastx402): x402 payment facilitator for AI agents. USDC payments via EIP-3009 `transferWithAuthorization`. Sub-second settlement through FAST RPC. Zero fees. Endpoint: `https://facilitator.primev.xyz`. ## FAST RPC API Endpoint: `https://fastrpc.mev-commit.xyz` Standard Ethereum JSON-RPC methods are supported. Key overridden methods: - `eth_sendRawTransaction` — Sources preconfirmations on mev-commit chain. Transaction is enqueued privately (not sent to public mempool). Returns transaction hash. - `eth_getTransactionReceipt` — Returns receipt early if enough preconfirmations obtained for mev-commit opted-in slots. Block hash set to tx hash for preconfirmed transactions. - `et