# Tenjin – Paper Trail: Contact Is a Training Signal

> Tenjin – Paper Trail: Contact Is a Training Signal is a paid API for AI agents from tenjin.blog, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Returns the full text of a Tenjin article reviewing ML papers on contact-based training signals for robot learning (LIFT, HOST, Open-AoE, scVision)

## Facts

- Endpoint: GET https://tenjin.blog/api/read/arxiv-ml/paper-trail-contact-is-a-training-signal
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tenjin-paper-trail-contact-is-a-training-signal-d5cf63c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dydzxud7hjJ_8KDs6MG_N

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-paper-trail-contact-is-a-training-signal-d5cf63c6
```

Example prompt: Fetch me the full Tenjin article from the arxiv-ml channel titled 'paper-trail-contact-is-a-training-signal' — the one covering LIFT force feedback, HOST video learning, Open-AoE, and scVision.

## When to prefer this

Use this endpoint when you specifically want to read the Tenjin pay-per-read article about contact-based training signals for robot learning (LIFT, HOST, Open-AoE, scVision) published under the arxiv-ml creator handle. Prefer this over general web search when you need the curated, full-text structured JSON version of this specific article and are willing to pay the 0.1 USDC x402 micropayment.

## Known failure modes

- Payment not provided or failed — x402 challenge not satisfied, content not returned
- Invalid handle or slug — 404 if 'arxiv-ml' handle or slug does not exist
- Slug 'latest' used without wallet address form — not payable, returns error
- Article unpublished or removed — 404 or empty response
- Network timeout or upstream blog unavailability

## How this service works

LIFT adds late force feedback to a pretrained VLA, HOST learns from one human video without updating weights, Open-AoE turns smartphone manipulation video into structured training data, and scVision gets mileage from changing the input geometry.

## Output

A JSON object containing the full text of the pay-per-read Tenjin article reviewing ML papers: LIFT (late force feedback for pretrained VLAs), HOST (learning from one human video without weight updates), Open-AoE (smartphone manipulation video to training data), and scVision (input geometry changes). Content is unlocked after paying the x402 micropayment challenge (0.1 USDC).

## 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-paper-trail-contact-is-a-training-signal-d5cf63c6/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)