# Tenjin – x402 Endpoint Failure Modes Article

> Tenjin – x402 Endpoint Failure Modes Article is a paid API for AI agents from tenjin.blog, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-27).

Retrieves the full text of a paid article analyzing real-world failure modes when running a paid x402 HTTP endpoint, measured against the live ERC-8004 registry and catalog as of 2026-08-08

## Facts

- Endpoint: GET https://tenjin.blog/api/read/agent-rails/running-a-paid-x402-endpoint-on-2026-08-08-the-failure-modes-measured-against-th?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tenjin-x402-endpoint-failure-modes-article-8d7052ae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VycFw97nl7PJ8FSeAnidy

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-x402-endpoint-failure-modes-article-8d7052ae
```

Example prompt: Fetch me the full Tenjin article about failure modes when running a paid x402 endpoint — the one published 2026-08-08 that covers the ERC-8004 registry census and live catalog data — using the handle 'agent-rails' and slug 'running-a-paid-x402-endpoint-on-2026-08-08-the-failure-modes-measured-against-th'.

## When to prefer this

Choose this endpoint when you specifically need the full text of this x402 failure-modes analysis article from Tenjin's agent-rails creator. It is the authoritative pay-per-read source for first-party x402 endpoint operator data including the ERC-8004 census and live catalog measurements. Prefer this over general web search when you need the complete, unpaywalled article content and have an x402-capable payment agent.

## Known failure modes

- Payment challenge not completed — returns 402 if the x402 payment is not submitted or is invalid
- Invalid handle or slug — returns 404 if the creator handle or article slug does not exist
- Slug 'latest' used with a handle instead of wallet address — not payable, returns error
- Unclaimed creator accessed by handle instead of wallet address — only address form works for unclaimed creators
- Network or chain RPC errors causing payment verification failure

## How this service works

Running a Paid x402 Endpoint on 2026-08-08: The Failure Modes, Measured Against the Live Registry and Catalog. Almost everything written about x402 is written for the buyer: how an agent pays, which wallet to give it, how not to get it drained. This is the other side. You have a paid HTTP endpoint, agents are supposed to discover it and buy from it, and the question is what actually breaks. As of 2026-08-08. Every SDK claim below names a version, every spec claim names a document, and the two datasets are first-party: a census of the ERC-8004 Identity Registry on Base taken at block 49,706,971, and a com

## Output

A JSON object containing the full text and metadata of the article 'Running a Paid x402 Endpoint on 2026-08-08: The Failure Modes, Measured Against the Live Registry and Catalog', including analysis of x402 SDK failure modes, ERC-8004 identity registry census data from Base at block 49,706,971, and catalog measurements — returned after payment of $0.10 USDC via x402 challenge.

## 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-x402-endpoint-failure-modes-article-8d7052ae/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)