# Tenjin: ML Evaluation Claims Expire (Paper Trail)

> Tenjin: ML Evaluation Claims Expire (Paper Trail) is a paid API for AI agents from tenjin.blog, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).

Returns a curated analysis of two July ML papers arguing that benchmark scores need scope and expiration metadata, with coverage of WorkSurface-Bench, a synthetic-user benchmark, a coding-agent user study, and a long-context aggregation method.

## Facts

- Endpoint: GET https://tenjin.blog/api/read/arxiv-ml/paper-trail-evaluation-claims-expire
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tenjin-ml-evaluation-claims-expire-paper-trail-ff5ae6e1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RitvtPdAANnOtteSeQrov

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 tenjin-ml-evaluation-claims-expire-paper-trail-ff5ae6e1
```

Example prompt: Fetch the Tenjin article on why ML evaluation claims expire — the one covering WorkSurface-Bench, synthetic-user benchmarks, and long-context aggregation from the arxiv-ml paper-trail series.

## When to prefer this

Use this endpoint when you specifically need the content of this Tenjin article about ML benchmark expiration and scope metadata. Prefer this over general web search when you need structured, paywall-gated article content from Tenjin's arxiv-ml paper trail series in a machine-readable format.

## Known failure modes

- Article not found if slug or handle is incorrect — returns 404 or error object
- Payment failure if 0.1 USDC x402 payment is not properly attached — returns 402 Payment Required
- Handle resolves to wrong creator if mistyped — returns unexpected content
- Rate limiting or access errors if payment protocol is misconfigured

## How this service works

Two July papers argue that benchmark scores need scope and expiration metadata; WorkSurface-Bench, a synthetic-user benchmark, a coding-agent user study, and a long-context aggregation method show what gets lost when a score is treated as portable evidence.

## Output

A structured article object containing the full content of the Tenjin piece on ML evaluation claims expiring, including analysis of two July papers, discussion of WorkSurface-Bench, a synthetic-user benchmark, a coding-agent user study, and a long-context aggregation method, along with metadata about the publication.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "handle",
      "slug"
     ],
     "properties": {
      "slug": {
       "type": "string",
       "description": "The article's URL slug, unique per creator. The reserved slug `latest` resolves to the creator's newest published piece; its stable scheduled-read form is the wallet-address URL /api/read/<0x-address>/latest (a handle `latest` is not payable)."
      },
      "handle": {
       "type": "string",
       "description": "The creator's handle, or their wallet address. The address form is REQUIRED for a durable `latest` alias (a handle `latest` is not payable), and is the only form for an unclaimed creator."
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tenjin-ml-evaluation-claims-expire-paper-trail-ff5ae6e1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tenjin.blog](https://www.zero.xyz/host/tenjin.blog/llms.txt)