# Cant find the Lets Encrypt API docs

**URL:** <https://community.letsencrypt.org/t/cant-find-the-lets-encrypt-api-docs/45343>\
**Category:** Help\
**Created:** [October 31, 2017, 4:38am UTC](https://community.letsencrypt.org/t/cant-find-the-lets-encrypt-api-docs/45343 "2017-10-31T04:38:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![clairealegres](https://avatars.discourse-cdn.com/v4/letter/c/7feea3/32.png) [@clairealegres](https://community.letsencrypt.org/u/clairealegres)\
**Post date:** [October 31, 2017, 4:38am UTC](https://community.letsencrypt.org/t/cant-find-the-lets-encrypt-api-docs/45343/1 "2017-10-31T04:38:17Z")

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We are trying to build our own client for lets encrypt (specifically for our usage which is quite customised), however it seems the docs does not contain API docs whatsoever. I have seen certbot and other clients but it appears to be not exactly what we need.

Can you guys point me to the right direction or tell me why this doc is no longer available on [https://letsencrypt.org/docs/](https://letsencrypt.org/docs/).

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**Author:** ![lbehm](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/lbehm/32/17634_2.png) [@lbehm](https://community.letsencrypt.org/u/lbehm)\
**Post date:** [October 31, 2017, 5:15am UTC](https://community.letsencrypt.org/t/cant-find-the-lets-encrypt-api-docs/45343/2 "2017-10-31T05:15:30Z")

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A good starting point would be [Boulder divergences from ACME](https://github.com/letsencrypt/boulder/blob/b80b129d1a459005ebf52862136108cdc1528be3/docs/acme-divergences.md) (or maybe newer version) and the mentioned RFCs. And there are a lot of them!

A better starting point imho would be a small existing client. Certbot is one of the largest. Maybe small ones like [acme-tiny](https://github.com/diafygi/acme-tiny)?  
Maybe you start with setting some basic parameters. What do you want to use for crypto, OpenSSL? Which OS do you want to support?

Good luck! 😉

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**Author:** ![jared.m](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/jared.m/32/17871_2.png) [@jared.m](https://community.letsencrypt.org/u/jared.m)\
**Post date:** [October 31, 2017, 8:36am UTC](https://community.letsencrypt.org/t/cant-find-the-lets-encrypt-api-docs/45343/3 "2017-10-31T08:36:15Z")

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Before looking at the divergences, have you had a look at the ACME specs? It’s an IETF draft RFC.

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**Author:** ![system](https://global.discourse-cdn.com/letsencrypt/original/3X/c/a/ca6c06ea1ea201324bba7048c6841ce60236468d.png) [@system](https://community.letsencrypt.org/u/system)\
**Post date:** [November 30, 2017, 8:36am UTC](https://community.letsencrypt.org/t/cant-find-the-lets-encrypt-api-docs/45343/4 "2017-11-30T08:36:21Z")

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Closed on November 30, 2017, 8:36am UTC

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