# Saylor Innovations Guide Library: Embedding and Retrieval Evaluation — AI & Agents

> Saylor Innovations Guide Library: Embedding and Retrieval Evaluation — AI & Agents is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-30).

Returns a guide on evaluating embedding and retrieval systems for AI and agent applications

## Facts

- Endpoint: GET https://saylorinnovations.com/api/kb/retrieval-evaluation?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-guide-library-embedding-and-retrieval-evaluation-d0b4ed2e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T01dkyq4H0qxFP_ib78cc

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-embedding-and-retrieval-evaluation-d0b4ed2e
```

Example prompt: Pull up the Saylor Innovations guide on embedding and retrieval evaluation for AI and agents — I want to understand how to properly assess retrieval quality in my RAG pipeline.

## When to prefer this

Choose this endpoint when you need a curated, practical guide specifically on embedding and retrieval evaluation in the context of AI agents and RAG pipelines. It is ideal when an agent or developer needs reference material on retrieval quality metrics, benchmarking approaches, or embedding comparison methodology, and wants a pre-written expert guide rather than generating content from scratch.

## Known failure modes

- Payment not included or insufficient (402 Payment Required — x402 protocol payment of $0.01 USDC required)
- Guide not found or endpoint path changed (404 Not Found)
- Service temporarily unavailable (503)
- Malformed request parameters (400 Bad Request)

## How this service works

Embedding and Retrieval Evaluation. A retrieval-benchmark procedure for RAG/semantic-search/agent-memory systems: build a judged query set covering hard negatives and no-answer cases, snapshot the whole retrieval stack for reproducibility, trace every stage, measure task-specific metrics (not one aggregate score), and canary in production with automatic rollback.

## Output

Returns a JSON object containing a guide entry with fields: id (guide identifier), t (title), c (category), body (full guide content text), price (numeric or null), and license (usage license string). The body contains the substantive written guide on embedding and retrieval evaluation for AI and agent systems.

## 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",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "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"
      },
      "t": {
       "type": "string"
      },
      "id": {
       "type": "string"
      },
      "body": {
       "type": "string"
      },
      "price": {
       "type": [
        "number",
        "null"
       ]
      },
      "license": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-guide-library-embedding-and-retrieval-evaluation-d0b4ed2e/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)