x402 is a missing piece of the HTTP protocol. Micro payments are a long standing quest, from xanadu to people sending their cc info through a form, paypal and later on bitcoin.

x402 has the goal of simplicity, minimalism, actual micro payments that even AI agents can perform, however…

I believe that the addition of a “follow up” or “ticketAddress” in the request would be more than enough to solve some of the problems I’ll list.

I want to start the conversation with this post.

If a requested asset or service is going to take more than a minute, it better give back a ticket to check on its status. Requesting an email as part of the request allows the system to send the ticket to the user for later use. A service might provide results periodically for some time too.
Agents can run out of credits, have connection problems, have bugs, anything, persisting a ticket somehow would mitigate these problems.

The paid response download link might fail for whatever reason, so getting an email back to download in the future is an obvious solution. Perhaps time limiting the download link validity or number of downloads is a smart choice to prevent abuse or agent errors (unintentional DoS by looping agent).

Additional information of how to best use the results of the service and perhaps metadata about it can facilitate the use of the service, specially for agents. For example a generated image might have other resolutions available, or several versions of the file might be inside a compressed file. Coordinate systems, languages, etc.

The customer might want to comment on the results for a given ticket, who knows, maybe the AI agent has their own opinions too.

The email might have magic link to simply login and access additional features. This flow might help popularize x402 to otherwise subscription focused service providers.

It can simply be the payment header but I’d like to see some uuid through the email for privacy.

e-mail has some issues:

• User or agent not wanting to share their address

• Plain text

• Spam filters

• ToS of e-mail providers might not like AI agents

• Temporary e-mail providers are not focused on privacy

Other options might be Telegram, Signal, or perhaps crypto native messaging systems like walletconnect chat, XMTP, and others. (Let me know what might fit the bill)

There are MCP servers for pretty much every messaging system so it’s not an issue from the implementation side.

With a “ticketAddress” field we might hit a sweet-spot of simplicity and possible usecases but it needs to be widespread enough so that libraries and agents are setup to follow this pattern.

x402 is a missing piece of the HTTP protocol. Micro payments are a long standing quest, from xanadu to people sending their cc info through a form, paypal and later on bitcoin.

x402 has the goal of simplicity, minimalism, actual micro payments that even AI agents can perform, however…

I believe that the addition of a “follow up” or “ticketAddress” in the request would be more than enough to solve some of the problems I’ll list.

I want to start the conversation with this post.

If a requested asset or service is going to take more than a minute, it better give back a ticket to check on its status. Requesting an email as part of the request allows the system to send the ticket to the user for later use. A service might provide results periodically for some time too.
Agents can run out of credits, have connection problems, have bugs, anything, persisting a ticket somehow would mitigate these problems.

The paid response download link might fail for whatever reason, so getting an email back to download in the future is an obvious solution. Perhaps time limiting the download link validity or number of downloads is a smart choice to prevent abuse or agent errors (unintentional DoS by looping agent).

Additional information of how to best use the results of the service and perhaps metadata about it can facilitate the use of the service, specially for agents. For example a generated image might have other resolutions available, or several versions of the file might be inside a compressed file. Coordinate systems, languages, etc.

The customer might want to comment on the results for a given ticket, who knows, maybe the AI agent has their own opinions too.

The email might have magic link to simply login and access additional features. This flow might help popularize x402 to otherwise subscription focused service providers.

It can simply be the payment header but I’d like to see some uuid through the email for privacy.

e-mail has some issues:

• User or agent not wanting to share their address

• Plain text

• Spam filters

• ToS of e-mail providers might not like AI agents

• Temporary e-mail providers are not focused on privacy

Other options might be Telegram, Signal, or perhaps crypto native messaging systems like walletconnect chat, XMTP, and others. (Let me know what might fit the bill)

There are MCP servers for pretty much every messaging system so it’s not an issue from the implementation side.

With a “ticketAddress” field we might hit a sweet-spot of simplicity and possible usecases but it needs to be widespread enough so that libraries and agents are setup to follow this pattern.