# Tenjin Answer API

> Tenjin Answer API is a paid API for AI agents from tenjin.blog, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Synthesizes a cited answer to a question from independent publishers; charges $0.05 USDC only on a hit, returns a free MISS if the question cannot be answered.

## Facts

- Endpoint: POST https://tenjin.blog/api/answer
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tenjin-answer-api-c0787a95
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zhUJKyVuMl4Yc65F_CoWl

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-answer-api-c0787a95 -d '<json body>'
```

Example prompt: Ask Tenjin what happened to DeFiLlama's stablecoin chart on July 14 — I need a cited answer with sources from independent publishers.

## When to prefer this

Choose this endpoint when you need a cited, synthesized answer drawn from curated independent publishers rather than a raw web search or LLM hallucination. It is especially well-suited for questions about crypto markets, DeFi events, and emerging web3 topics covered by Tenjin's publisher catalog. The pay-on-hit model makes it cost-efficient: unanswerable questions cost nothing, so it can be used speculatively. Prefer it over general search when source provenance and citation quality matter.

## Known failure modes

- MISS response when the question falls outside the catalog — returned free with no charge
- Ambiguous or overly broad questions may yield partial answers or a MISS
- Payment failure via x402 protocol if wallet has insufficient USDC
- Network or service errors returning non-200 HTTP status
- Question phrasing too vague to match catalog entries

## How this service works

Pay once for a cited answer synthesized from independent publishers on Tenjin. POST a question; a question the catalog cannot answer returns a free MISS and is never charged.

## Output

A synthesized prose answer to the submitted question, accompanied by citations identifying the independent publishers whose content was used. If the catalog cannot answer the question, the API returns a free MISS response with no charge and no answer content.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "maxPrice": {
   "type": "string",
   "pattern": "^\\d{1,39}$",
   "description": "Optional ceiling on the flat answer price, in atomic USDC units as a digit string (\"10000\" = $0.01). Below the quoted price the request is refused with `max_price_below_quote` rather than degraded; it never narrows which pieces the answer draws on."
  },
  "question": {
   "type": "string",
   "maxLength": 512,
   "minLength": 1,
   "description": "The question to answer, 1 to 512 characters. Leading and trailing whitespace is trimmed before the length check, so an all-whitespace value is rejected."
  },
  "freshWithin": {
   "type": "string",
   "description": "Optional recency window as an ISO 8601 duration, P<n> followed by D, W, M or Y (for example \"P30D\"). n must be nonzero."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tenjin-answer-api-c0787a95/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)