TZ APAC has incorporated Coinbase’s x402 payment protocol into Etherlink, facilitating pay-per-request API monetization through on-chain stablecoins.

With this development, TZ APAC has introduced support for the open-source x402 payment protocol on Etherlink, an EVM-compatible interface for Tezos. The integration, branded as Tez402, enables any Etherlink API to operate as a pay-per-request endpoint, completing transactions in on-chain stablecoins without subscriptions, invoicing, or intermediaries.

Bringing HTTP 402 back for internet-native payments

As per the announcement, x402 functions by reactivating the rarely-used ‘Payment Required’ status code (HTTP 402) that was originally included in the HTTP specification. Upon a client requesting access to a restricted endpoint, the server sends payment instructions embedded within standard HTTP headers. Subsequently, the client makes an on-chain crypto payment, and once confirmed, access is granted, thus eliminating the necessity for traditional billing infrastructure. This model is particularly advantageous for machine-to-machine transactions and automated workflows.

TZ APAC has tailored the original Coinbase implementation specifically for Etherlink by incorporating a facilitator layer and a Permit2 proxy. These elements enable payments to be conducted using ERC-20 tokens while ensuring that the transaction process remains non-custodial and destination-bound, preventing redirection of funds outside the agreed settlement path.

Use cases and ecosystem placement

The integration targets various segments including API and SaaS teams, who can now integrate pay-per-request billing without handling subscription complexities. Additionally, Web3 applications on Etherlink will benefit from a direct mechanism for monetizing endpoints, while wallet providers, SDK developers, and infrastructure teams are set to have a tangible integration blueprint. TZ APAC has also designated the implementation as a reference build for hackathon participants and ecosystem contributors operating within the Tezos network.

Considering its broader implications, x402 is positioned as foundational infrastructure for what TZ APAC refers to as an ‘agentic economy’, denoting environments where autonomous software agents can transact independently in real-time at a scale and frequency that traditional payment channels cannot accommodate. On-chain stablecoin settlement without subscription overhead aims to address precisely these limitations.

Currently, the Tez402 integration is operational on the Etherlink mainnet. Developers have the option to settle transactions using the TZ APAC facilitator or customize their own setup, with full implementation documentation available through a quick-start guide published by TZ APAC.