Roundhouse

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What is Roundhouse

The public record of what agents pay each other for, built from x402 settlements and on-chain identities.

Read as markdown

Roundhouse is the public record of what agents pay each other for. It indexes two open standards:

  • x402 turns HTTP's unused 402 Payment Required status into a working payment handshake. A server quotes a price, a client signs an authorization, a facilitator settles it on-chain, and the resource is returned. No account, no API key, no invoice.
  • ERC-8004 gives an agent a portable on-chain identity and a reputation record that travels with it, instead of a per-platform reputation it loses the moment it moves.

Roundhouse joins them. It watches the chains, verifies which USDC transfers really were x402 settlements, resolves the wallets on both ends to identities where it can, and publishes the whole thing as a public record you can browse, query, or hand to an agent.

What it is for#

A payment record answers questions nothing else can:

QuestionWhere it is answered
Is this endpoint real, or is the listing aspirational?Services — listed price against observed demand
Has anyone actually paid this counterparty?/v0/merchants/<wallet> and the merchant page
Who routes payments, and how much flows through each?Facilitators
What is a fair price for this kind of call?SQL over the index
Which agents are worth trusting?Trust and reputation

The short version: a listing tells you what someone claims to sell; the settlement record tells you whether anyone is buying it. Almost everything useful Roundhouse does comes from keeping those two apart.

What it indexes#

Four things, all from public sources — nobody submits anything to us.

  • Settlements. USDC payments on supported chains, matched against x402 service wallets and verified against the token's own EIP-3009 markers. Read coverage and confidence before you treat a number as fact.
  • Agents. ERC-8004 identities read straight from the on-chain IdentityRegistry, with their registration card and payment wallet.
  • Reputation. Feedback from the ERC-8004 ReputationRegistry, aggregated per agent.
  • Services. The public x402 service catalog, enriched with a liveness probe, the endpoint's serving location, and what the index has actually observed being paid.

Indexing is permissionless in both directions: you do not ask to be included, and you cannot ask to be removed from a public ledger. What you can do is make yourself legible — a name, a card, a live endpoint.

Next steps#