# TwelveX RSI Endpoint — Relative Strength Index for Financial Instruments

> TwelveX RSI Endpoint — Relative Strength Index for Financial Instruments is a paid API for AI agents from tw3lvtrexdata.vercel.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-19).

Returns the Relative Strength Index (RSI) technical indicator for a given stock, forex pair, or crypto symbol over a specified interval and time period, powered by Twelve Data.

## Facts

- Endpoint: GET https://tw3lvtrexdata.vercel.app/api/rsi/%7Bsymbol%7D?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/twelvex-rsi-endpoint-relative-strength-index-for-financial-instruments-13ba4470
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oSLQVivg_iuHDBgnaO8Ym

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 twelvex-rsi-endpoint-relative-strength-index-for-financial-instruments-13ba4470
```

Example prompt: What's the 14-period RSI for AAPL on the daily interval right now — is it overbought or oversold?

## When to prefer this

Choose this endpoint when you need RSI specifically as a technical indicator for stocks, forex, or crypto. Prefer it over general price endpoints when you need momentum/overbought/oversold signals for trading decisions, backtesting, or algorithmic strategies. It is well-suited for agents that need a single computed indicator value rather than raw OHLCV price data.

## Known failure modes

- Invalid or unsupported symbol returns an error response
- Unsupported interval value may result in a bad request error
- Missing symbol in the URL path causes a 404 or malformed request
- Rate limiting or payment failure returns a 402 or 429 error
- Twelve Data upstream downtime may cause timeout or empty response

## How this service works

Premium financial data API — 25 endpoints for stocks, forex, crypto, and technical analysis. Powered by Twelve Data.

## Output

Returns an RSI value (or series of RSI values) for the requested symbol, computed over the specified interval and time period. Typical output includes the symbol, indicator name, timestamps, and RSI numeric values indicating momentum strength (values above 70 suggest overbought, below 30 suggest oversold).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "interval": {
   "type": "string"
  },
  "time_period": {
   "type": "string",
   "description": "Default: 14"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/twelvex-rsi-endpoint-relative-strength-index-for-financial-instruments-13ba4470/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tw3lvtrexdata.vercel.app](https://www.zero.xyz/host/tw3lvtrexdata.vercel.app/llms.txt)