# x402

x402 is an entry in this index of agent wallets and payment rails; every fact links back to the vendor's docs or the protocol spec.

Open HTTP 402 payment standard: a server answers 402 with payment terms, the client signs a payload, retries, and settles on chain. Rail-agnostic; USDC on Base and Solana dominate live use.

## Details

- Address: Online, Global
- Website: [www.x402.org](<https://www.x402.org>)
- Organization: x402 Foundation
- Status: Live
- Rail: Mixed
- Chains: Base, Solana
- Protocols: X402
- Per-call minimum: None in the spec; facilitators and sellers set floors
- Spend caps: None published
- Human approval: None
- KYC needed: Varies
- Custody: not applicable
- MCP support: Community
- Fees: Set by the facilitator; the Coinbase facilitator is free on Base
- Licence: Apache-2.0
- Source: [github.com/x402-foundation/x402](<https://github.com/x402-foundation/x402>)

## Questions

### Where is x402?

x402 is at Online, Global.

### How do I contact x402?

To contact x402, visit https://www.x402.org.

## Source

From [Open protocol specifications](https://github.com/x402-foundation/x402), license Apache-2.0 (x402, AP2 and ACP spec repos) and MIT OR Apache-2.0 (MPP specs), checked 2026-10-21.

Last updated October 21, 2026.

## Links

- This agent wallet on the [web page](<https://agentwalletindex.fyi/global/online/x402>)
- [Payment protocols in Online](<https://agentwalletindex.fyi/global/online/category/payment-protocols.md>)
- [More agent wallets in Online](<https://agentwalletindex.fyi/global/online.md>)

> **Check before you fund.** Features, fees and protocol support change. Follow the cited source on each row before you let an agent hold or spend money.