Bitcoin Forum

Is there a bitcoin-related service that provides such a service?

Examples of suitable products: Signal, Session, etc.

I am developing an app that relies on such P2P messaging, but I can't find one like Signal or Session that has an API to integrate with my software so I can algorithmically send messages to users without using some janky 3rd party bandaid.

If i understand you correctly, you are trying to find/ask an anon p2p bitcoin-related messaging app?
I don't think i heard such service, why it needed to be bitcoin-related though.

Have you checked SimpleX? It's like new and privacy-centric messaging app, also open-source.

As for the api, i don't think a privacy and security-wise messaging service will offer it.

Why would this p2p messaging needed to be Bitcoin related?

SimpleX.chat is best option I found so far.
It works both on mobile and desktop computers, it's open source, there are no user IDs and no need to use phone numbers.
Important to know that SimpleX is accepting Bitcoin and other crypto donations.
https://github.com/simplex-chat/simplex-chat#help-us-with-donations

I asked about bitcoin, but I should have said blockchain. I don't have any specific crypto requirement, just wondering if any messaging app service exists that does integrate some form of blockchain for security, signing, encryption, etc.

If none of that is something that blockchain can help with, pardon the poor question.

SimpleX looks nice--is there a python library for API integration?

I do not think that many will be enthusiastic about downloading an app, if develop a website that provides P2P messaging with an encryption layer, you will find more demand.
https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript

I like Nostr due to it's decentralization, so I will recommend their own messaging apps https://www.nostrchat.io/

You need to import your nsec or npub to login, pretty much similar like Bitcoin.

This is their API integration https://github.com/NostrChat/nostr-tools?tab=readme-ov-file

You can try the system used by MQL5, the signal service there is very good. many traders open open signal services, open copy trading there.
But if you only open trading signals using telegram or WA applications, it is enough not to need to create a complicated website. unless it is only for promotion.

I expect most decent messaging app wouldn't bother add non essential feature such as blockchain or cryptocurrency support. Usually, you only can find cryptocurrency wallet or app with chat feature. Here's an example, https://play.google.com/store/apps/details?id=one.mixin.messenger (https://play.google.com/store/apps/details?id=one.mixin.messenger). And FWIW, Telegram might fit your criteria if you only use secret chat[1] and use either disposable phone number or buy anonymous phone number which only can be used for Telegram[2].

[1] https://tsf.telegram.org/manuals/e2ee-simple (https://tsf.telegram.org/manuals/e2ee-simple)
[2] https://www.theverge.com/2022/12/7/23498236/telegram-fragment-phone-number-crypto-verification-monetization (https://www.theverge.com/2022/12/7/23498236/telegram-fragment-phone-number-crypto-verification-monetization)

I think I used an app with some encryption or messages that deleted themselves after x period of time called Mattermost. It's been awhile since I have used it so I could be wrong here, but might be worth checking out.

Back in 2021, I tested Status.app (https://status.app/features/messenger) out of interest. It's a blockchain-based p2p messenger. Seems like it is still being actively developed. I also remember to read good recommendations for BeeChat (https://beechat.network) some time ago but I have never used it myself.