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openx402 is a permissively licensed, self-hostable x402 v2 facilitator for Stellar. Use it to protect HTTP or MCP resources, sponsor network fees without custodying seller funds, catalog services through Bazaar, and give agents a discovery surface. Public Stellar testnet preview
Stellar exact is live and canonical-client tested on testnet. Stellar upto is proposed, and pubnet remains disabled in checked-in profiles. Review security and release status before operating beyond testnet.

Complete a paid request

Start a seller, make a real testnet payment, and confirm automatic Bazaar cataloging.

Protect a resource

Add Stellar payment requirements and official Bazaar metadata to an Express endpoint.

Deploy your own stack

Run the facilitator and PostgreSQL with optional semantic search and MCP discovery.

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What ships

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How a payment flows

The facilitator validates payment data and settles on Stellar. It never proxies the seller’s application request, executes seller code, or becomes custodian of seller funds.

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Choose your path

Seller developer

Protect an HTTP resource or catalog a paid MCP tool.

Buyer developer

Validate a challenge, sign the canonical Stellar payload, retry once, and inspect settlement.

Agent builder

Search hosted discovery or run a private signer-enabled MCP with independent payment ceilings.

Infrastructure operator

Deploy, configure, monitor, rotate keys, and understand the system’s fixed security invariants.
Seller metadata is untrusted. A catalog entry marked payment_observed means the facilitator validated payment terms carried with that listing; it does not prove origin ownership, accuracy, availability, or quality.
Last modified on August 3, 2026