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eclair/docs/API.md
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Convert wiki pages in to files in the docs directory and general docs file cleanups (#2165)
Created new files for pages that were in the wiki, but not already in the docs directory. Also made following fixes to  README.md and existing files in the docs directory:

* update bolt links to avoid redirect
* link to logging guide from logging section (README.md)
* fixed typo in Backup section and capitalization of Bitcoin Core (README.md)
* Alice does not need trampoline feature enabled (TrampolinePayments.md)
* link to 2021 edition of Trampoline PR (TrampolinePayments.md)
* fixed API examples and removed quotes from password (API.md)
* use --nodeIds for sendtoroute examples (TrampolinePayments.md and MultipartPayments.md)
* update CLI example 3 to use jq (Usage.md)
* fix typo in docs/FAQ.md
* updated Guide.md to point to all pages that are guides
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Markdown

# API
Eclair can setup a JSON API on the `eclair.api.port` port set in the [configuration](./Configure.md). You first need to enable it:
```
eclair.api.enabled=true
eclair.api.password=changeit
```
:rotating_light: **Attention:** Eclair's API should NOT be accessible from the outside world (similarly to Bitcoin Core API).
## Payment notification
Eclair accepts websocket connection on `ws://localhost:<port>/ws`, and emits a message containing the payment hash of a payment when receiving a payment.
## API calls
This API exposes all the necessary methods to read the current state of the node, open/close channels and send/receive payments. For the full documentation please visit https://acinq.github.io/eclair
#### Example: open a channel
Your node listens on 8081. You want to open a 140 mBTC channel with `endurance.acinq.co` on Testnet with a 30 mBTC `push`
1/ connect to the node with the URI:
```shell
curl -X POST \
-u :api_password \
-F uri="03933884aaf1d6b108397e5efe5c86bcf2d8ca8d2f700eda99db9214fc2712b134@endurance.acinq.co:9735" \
http://127.0.0.1:8081/connect
```
2/ Open a channel with this node
```shell
curl -X POST \
-u :api_password \
-F nodeId=03933884aaf1d6b108397e5efe5c86bcf2d8ca8d2f700eda99db9214fc2712b134 \
-F fundingSatoshis=14000000 \
http://127.0.0.1:8081/open
```
Feeling tired of writing all these `curls`? Good news, a CLI bash file is available. It uses this API to interact with your node. More information about `eclair-cli` is [here](./Usage.md).