From 7ad40d5159a806f2ae97bdbb2fc2a8bbb6fa89a2 Mon Sep 17 00:00:00 2001
From: Pablo Fernandez <p@f7z.io>
Date: Sun, 5 Nov 2023 13:14:43 +0200
Subject: [PATCH] Recurring Subscriptions

---
 88.md     | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 README.md |  2 ++
 2 files changed, 81 insertions(+)
 create mode 100644 88.md

diff --git a/88.md b/88.md
new file mode 100644
index 0000000..2bfe990
--- /dev/null
+++ b/88.md
@@ -0,0 +1,79 @@
+NIP-88
+======
+
+Recurring Subscriptions
+-----------------------
+
+`draft` `optional` `author:pablof7z`
+
+This NIP defines a way for a pubkey to create recurring subscription payments to another pubkey.
+
+## Tier Event
+A pubkey can create "tiers". These tiers might provide certain benefits to the supporters who subscribe to these.
+
+```json
+{
+    "kind": 7002,
+    "content": "<description of the tier>",
+    "tags": [
+        [ "title", "..." ],
+        [ "amount", "<amount-in-base-unit>", "currency", "<cadence>" ]
+    ]
+}
+```
+
+This event is generated by a pubkey who wants to allow users to support with different tiers.
+
+`.content` SHOULD be a description of what users who subscribe can expect.
+Tag `title` is an optional title for the tier.
+Tag `amount` MUST specify the payment required for this tier and its cadence.
+    * The first argument should be the stringified amount and the second argument the currency
+    * The third argument SHOULD be one of `daily`, `monthly`, `yearly`
+One or more `amount` tags MUST exist.
+
+#### Examples
+* `[ "amount", "100", "usd", "daily" ]`, $1.00 a day.
+* `[ "amount", "1000000", "btc", "daily" ]`, 1000000 millisats a day.
+
+## Subscribe Event
+
+```json
+{
+    "kind": 7001,
+    "content": "<optional-message>",
+    "tags": [
+        [ "p", "<recipient-pubkey>" ],
+        [ "e", "<supporting-tier-id>" ],
+        [ "amount", "<amount-in-base-unit>", "currency", "<cadence>" ]
+    ]
+}
+```
+
+When a user wants to subscribe to subscribe to support a user they create a `kind:7001` event.
+
+* `.content` is an optional message the supporter can write.
+* The `p` tag MUST tag the pubkey being supported.
+* The `e` tag is optional, and should point to a `kind:7001` support tier event. There MUST be exactly 0 or 1 `e` tags.
+* The `amount` tag specifies what the supporters is committing to pay to the supported pubkey and the candence.
+
+The `kind:7001` event can be created without an `e` tag so that users can create recurring support events without the pubkey receiving the support having explicitly created a support tier.
+
+## Paying
+The supporting user should create a zap p-tagging the receiver and e-tagging the `kind:7001`. There MUST be a single `p` and a single `e` tag in the zap request.
+
+```json
+{
+    "kind": 9734,
+    "content": "",
+    "tags": [
+        [ "p", "<recipient-pubkey>" ],
+        [ "e", "<kind-7001-event-id>" ]
+    ]
+```
+
+Clients supporting this NIP can check for zaps e-tagging the `kind:7001` event to find the pubkeys that have a valid, paid subscriptions at each different period.
+
+The same `kind:7001` is re-zapped on a regular basis per the cadence specified in the event.
+
+## Stopping a subscription
+A user who wants to stop a subscription by publishing a `kind:5` deletion request of the `kind:7001` event.
diff --git a/README.md b/README.md
index 8be0595..feb26b6 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,8 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `1985`  | Label                      | [32](32.md) |
 | `4550`  | Community Post Approval    | [72](72.md) |
 | `7000`  | Job Feedback               | [90](90.md) |
+| `7001`  | Recurring Subscription     | [88](88.md) |
+| `7002`  | Recurring Subscription Tier| [88](88.md) |
 | `9041`  | Zap Goal                   | [75](75.md) |
 | `9734`  | Zap Request                | [57](57.md) |
 | `9735`  | Zap                        | [57](57.md) |