# Saylor Innovations Guide Library: JavaScript Async/Await & Promise Pitfalls

> Saylor Innovations Guide Library: JavaScript Async/Await & Promise Pitfalls is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Returns a knowledge-base guide explaining common JavaScript async bugs including missing await, async forEach, serial vs parallel awaits, Promise.all vs allSettled, and unhandled rejections

## Facts

- Endpoint: GET https://saylorinnovations.com/api/kb/javascript-async-await-promise-pitfalls?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-guide-library-javascript-async-await-promise-dbf3ba46
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oBwUNQ-l8VpCTsol-iMDH

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-guide-library-javascript-async-await-promise-dbf3ba46
```

Example prompt: Can you pull up the guide on JavaScript async/await pitfalls? I keep running async functions inside forEach and they're not waiting properly, and I'm not sure when to use Promise.all versus allSettled.

## When to prefer this

Choose this endpoint when an agent or developer needs authoritative, curated reference content on JavaScript async/await patterns and common bugs rather than generating an ad-hoc LLM answer. Useful when you want a stable, citable knowledge-base article with consistent body text on async pitfalls — especially for async forEach, Promise.all vs allSettled, and unhandled rejections — rather than a search result or generative explanation.

## Known failure modes

- Non-GET method returns an error
- Guide content unavailable or service down returns an HTTP error
- Payment of $0.01 USDC not processed results in 402 Payment Required
- Response body may be empty or malformed if upstream data source is unavailable

## How this service works

Fix JavaScript async bugs - missing await, forEach with async, serial vs parallel awaits, Promise.all vs allSettled, unhandled rejections

## Output

A JSON object containing the guide's unique id, title (t), category (c), and body text with detailed explanations of JavaScript async patterns and fixes — covering missing await, async forEach antipatterns, serial vs parallel execution, Promise.all vs allSettled comparisons, and unhandled rejection handling. May also include a license identifier and price field.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "id",
      "t",
      "c",
      "body"
     ],
     "properties": {
      "c": {
       "type": "string",
       "description": "Category of the guide"
      },
      "t": {
       "type": "string",
       "description": "Title of the guide"
      },
      "id": {
       "type": "string",
       "description": "Identifier of the record"
      },
      "body": {
       "type": "string",
       "description": "Main body text"
      },
      "price": {
       "type": [
        "number",
        "null"
       ],
       "description": "Price"
      },
      "license": {
       "type": "string",
       "description": "License identifier"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-guide-library-javascript-async-await-promise-dbf3ba46/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)