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105.md
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105.md
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NIP-105
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======
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API Service Marketplace
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-------------------------------
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`draft` `optional` `author:coachchuckff` `author:unclejim21` `author:cmdruid`
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This NIP defines `kind:31402` (a _parameterized replaceable event_) for broadcasting API services, endpoints and their costs in mSats. API services are offered ala carte to be paid via lightning invoices.
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API service providers will issue a `kind:31402` event as an API service offering. Clients can fetch `s` (service) tag offerings, call their endpoints, and pay per use. Creating an API service marketplace.
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## Protocol flow
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1. API Service provider creates and hosts API service offerings, they then issue a `kind:31402` event for each `s` ( service ) tag.
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2. Client fetches API offerings by `s` tag.
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3. Client chooses a provider(s) and POSTs to their `endpoint`. The POST body should match exactly what is required by the underlying API less the API key. ( Or following the note's `schema` )
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4. The service provider should validate their request and return a lightning invoice with a `successAction` url. The `successAction` url should be formatted as such: `<endpoint>/<invoice_hash>/get_result`
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5. The client pays.
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6. The client will poll the `successAction` until the service provider has returned the result(s) matching exactly what the underlying API will produce ( Or following the note's `outputSchema` ).
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## Server Functions
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### Create Invoice
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Initally, the client will make a POST request to the `endpoint`. The POST body should be exactly what the underlying API is expecting less the API key. This information should also be represented in the `schema` portion of the `content` field.
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The service provider will then do the following:
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1. Validate their API request
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2. Issue a lightning invoice
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The issued lightning invoice will contain a `successAction` url formatted as so:
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```typescript
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{
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tag: "url",
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url: `https://example.api/chat/${paymentHash}/get_result`,
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description: "Open to get the confirmation code for your purchase."
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}
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```
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From here the service provider can either listen and execute their API request "on-payment" or wait until the client calls `get_results`.
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### Get Results
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Once the client has gotten the `successAction` url, they can issue a GET request. The service provider should respond in one of three ways:
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1. 200 ( DONE ) - the service provider returns the results of the API as if it was coming from the product itself ( Errors included )
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2. 202 ( WORKING ) - the service provider returns a status that indicates the results are not ready yet.
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3. 402 ( NOT PAID YET ) - the service provider should respond with a 402 error if the client has not paid yet.
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It is up to the Client to poll the `successAction` until a terminal result is reached.
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## Event Reference and Examples
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### Offering Event
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`kind:31402`
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`.content` should be a JSON stringified version of the following JSON:
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```typescript
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enum OfferingStatus {
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up = 'UP',
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down = 'DOWN',
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closed = 'CLOSED'
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}
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interface OfferingContent = {
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endpoint: string, // The POST endpoint you call to pay/fetch
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status: OfferingStatus, // UP/DOWN/CLOSED
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cost: number, // The cost per call in mSats
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schema?: Object, // Reccomended - JSON schema for the POST body of the endpoint
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outputSchema?: Object, // Reccomended - JSON schema for the response of the call
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description?: string // Optional - Description for the end user
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}
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```
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`.tag` MUST include the following:
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- `s`, the service tag should simply be the underlying API endpoint of the service provided. For example if you are offering a ChatGPT service, you would set `s` = `https://api.openai.com/v1/chat/completions`. This way the service they are buying is implicit.
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- `d`, following **parameterized replaceable events** in [NIP-01](https://github.com/nostr-protocol/nips/blob/master/01.md), this tag allows this event to be replaceable. Since there should only be one service per pubkey, the `d` tag should match the `s` tag.
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### Example Service Event
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```typescript
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const content = {
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endpoint: "https://example.api/chat/",
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status: "UP",
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cost: 5000,
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schema: {...},
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outputSchema: {...},
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description: "This will call the ChatGPT endpoint"
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}
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const event = {
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"kind": 31402,
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"created_at": 1675642635,
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"content": JSON.stringify(content),
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"tags": [
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["s", "https://api.openai.com/v1/chat/completions"]
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["d", "https://api.openai.com/v1/chat/completions"],
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],
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"pubkey": "<pubkey>",
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"id": "<id>"
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}
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```
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### Example Schema
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The following is for the `gpt-3.5-turbo` input schema:
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```json
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{
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"type": "object",
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"properties": {
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"model": {
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"type": "string",
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"enum": ["gpt-3.5-turbo"]
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},
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"messages": {
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"type": "array",
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"items": {
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"type": "object",
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"properties": {
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"role": {
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"type": "string",
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"enum": ["system", "user"]
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},
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"content": {
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"type": "string"
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}
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},
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"required": ["role", "content"]
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},
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"minItems": 1
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}
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},
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"required": ["model", "messages"]
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}
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```
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The following is for the `gpt-3.5-turbo` output schema:
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```json
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{
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"type": "object",
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"required": ["id", "object", "created", "model", "choices", "usage"],
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"properties": {
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"id": {
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"type": "string",
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"pattern": "^chatcmpl-[a-zA-Z0-9-]+$"
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},
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"object": {
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"type": "string",
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"enum": ["chat.completion"]
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},
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"created": {
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"type": "integer"
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},
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"model": {
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"type": "string"
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},
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"choices": {
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"type": "array",
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"items": {
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"type": "object",
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"required": ["index", "message"],
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"properties": {
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"index": {
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"type": "integer"
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},
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"message": {
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"type": "object",
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"required": ["role", "content"],
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"properties": {
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"role": {
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"type": "string",
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"enum": ["assistant"]
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},
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"content": {
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"type": "string"
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}
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}
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},
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"finish_reason": {
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"type": "string",
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"enum": ["stop"]
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}
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}
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}
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},
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"usage": {
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"type": "object",
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"required": ["prompt_tokens", "completion_tokens", "total_tokens"],
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"properties": {
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"prompt_tokens": {
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"type": "integer"
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},
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"completion_tokens": {
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"type": "integer"
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},
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"total_tokens": {
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"type": "integer"
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}
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}
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}
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}
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}
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```
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### Safey
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It is not mandatory, but to raise the barrier to entry, clients should screen service provider's NIP-05 identifier. The domain used in their NIP-05, should be the same domain used for their endpoint.
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Clients may wish to create a whitelist of trusted service providers once tested.
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### Problems
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- No data integrity - service providers can store/redistribute any data passed to them
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- Service providers could take payment and never return the product
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- Service providers are not gaurenteed to call the endpoint specified in the `s` tag
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- No recourse for errored API fetches
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- The `cost` field may not match the actual final price
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- No proof of purchase
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### Example Implementations
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- [Server](https://github.com/Team-Pleb-TabConf-2023/nip-105-server)
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- [Client](https://github.com/Team-Pleb-TabConf-2023/nip-105-client)
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