Skip to content

Robinhood Chain x402 (candidate)

developer

Historical research scaffold for a self-hosted facilitator — superseded by the Meridian lane for Robinhood Chain payments.

Could HISS run its own self-hosted x402 settlement for USDG on Robinhood Chain? The honest answer remains: not yet built, and HISS does not claim it. The feature flag ENABLE_ROBINHOOD_CHAIN_X402_CANDIDATE is false and nothing in production depends on it.

What is verified (2026-07-08)

  • Robinhood does not document x402 support anywhere in its chain docs.
  • Bankr x402 Cloud settles exclusively on Base (USDC default); no other settlement chain is documented.
  • Meridian, a third-party facilitator, documents the robinhood network (4663, USDG) — the hosted lane HISS uses when configured.
  • Other hosted facilitators (Coinbase CDP: Base, Polygon, Arbitrum, World, Solana) do not list Robinhood Chain.
  • The x402 protocol itself is chain-agnostic; self-hosted facilitators can support arbitrary EVM chains.
  • Permit2 is deployed on Robinhood Chain at the canonical address — the universal ERC-20 path exists.
  • USDG implements EIP-3009 per Paxos's repository, but the chain-4663 deployment's EIP-3009 support is unverified on-chain.

What a build would take

  1. Run a self-hosted facilitator with a funded settlement wallet on chain 4663.
  2. Verify (or deploy) the x402 Permit2 proxy on Robinhood Chain; verify USDG EIP-3009 on-chain.
  3. Add a custom network entry to the x402 SDKs and payment clients.
  4. Confirm Bankr can discover/consume a self-hosted endpoint, or publish discovery independently.
  5. Clear the legal/payments review for accepting stablecoin payments on a new rail.

$HISS is independent research software in pre-execution readiness checks — not investment advice, and not affiliated with Robinhood, Bankr, or Chainlink.