> For the complete documentation index, see [llms.txt](https://docs.vapinetwork.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vapinetwork.ai/reference/x402-on-vapi/contracts.md).

# x402 contracts

Base mainnet FeeSplitter, FeeRouter, and BuybackBurner contracts handle provider payouts, network fees, and vAPI token burns.

Use this page to find the Base mainnet contracts used by the x402 fee path and the vAPI token burn path. Each address links to BaseScan for onchain inspection.

## Base mainnet

| Contract           | Address                                                                                                               | What it does                                                                                                                              |
| ------------------ | --------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| FeeRouter          | [0xe11aeeC31E54E8E6E66382c8BdBFfd1000E0194B](https://basescan.org/address/0xe11aeeC31E54E8E6E66382c8BdBFfd1000E0194B) | Immutable, permissionless USDC distribution across the configured burn sink, operations address, and protocol treasury.                   |
| FeeSplitterFactory | [0x8405f917f6EfBd1447aF01Fe879529bcD313279D](https://basescan.org/address/0x8405f917f6EfBd1447aF01Fe879529bcD313279D) | Deterministically deploys one FeeSplitter per provider wallet. The factory fixes the token, treasury, and 95/5 split for its lifetime.    |
| BuybackBurner      | [0x910780Ac98BD2e7509CaF2f6833be947DD30d96b](https://basescan.org/address/0x910780Ac98BD2e7509CaF2f6833be947DD30d96b) | Executor-operated path that converts held USDC to vAPI and burns held vAPI. A separate permissionless function can retry a deferred burn. |
| vAPI token         | [0x1eA8deB921AA6015f4938010C848140b98108Dd2](https://basescan.org/address/0x1eA8deB921AA6015f4938010C848140b98108Dd2) | The vAPI token used by BuybackBurner as its burn target.                                                                                  |

Added APIs use a provider's FeeSplitter as the payout address. The splitter sends 95% to the provider and 5% to the FeeRouter. The FeeRouter distributes its USDC according to its immutable configuration.

See [x402 on vAPI](/reference/x402-on-vapi/x402.md) for the request and settlement flow.

Checked on 2026-10-02.


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