# RobinX Caller Performance Grader

> RobinX Caller Performance Grader is a paid API for AI agents from api.robinx.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns graded call history and performance metrics for a specific X (Twitter) handle's token calls on Robinhood Chain (chain 4663), measured against real on-chain price data

## Facts

- Endpoint: GET https://api.robinx.io/caller/%7Bhandle%7D/calls
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/robinx-caller-performance-grader-672a3957
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vEo0WE6PpRuXsI16icXv1

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 robinx-caller-performance-grader-672a3957
```

Example prompt: Can you pull up the RobinX call history and performance score for the X account 'gleobets' — I want to see how accurate their Robinhood Chain token calls have been, including their early call rate and median price move?

## When to prefer this

Choose this endpoint when you need objective, on-chain-verified performance data for a specific X/Twitter crypto caller on Robinhood Chain (chain 4663), rather than relying on follower counts or self-reported track records. Ideal for agent workflows that vet signal sources, score influencer credibility, or filter caller feeds by proven accuracy.

## Known failure modes

- Unknown or invalid X handle returns empty call array
- Handle with no Robinhood Chain calls returns zero metrics
- Rate limiting or payment failure over x402 returns 402 Payment Required
- Chain data unavailability may result in incomplete token outcomes
- Newly created X accounts may have insufficient history for meaningful scoring

## How this service works

RobinX grades every X (Twitter) caller and every deployer on Robinhood Chain (chain 4663) against real on-chain price since genesis — who called it early, who chased, whose launches survive. Receipts, not follower counts. Per call over x402, or one line of MCP.

## Output

A JSON object containing the caller's X handle, an array of their individual token calls (each with token address, symbol, tweet timestamp, and outcome data including FDV in USD and whether the token is real), plus aggregated metrics: total call count, early call rate (0–1), and median 1-hour price move.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "calls": [
    {
     "token": "0x45242320dbb855eea8fd36804c6487e10e97fcf9",
     "symbol": "TENDIES",
     "tweeted_at": "2026-07-10T01:53:15Z",
     "token_outcome": {
      "fdv_usd": 23018464,
      "is_real": true
     }
    }
   ],
   "handle": "gleobets",
   "measured": {
    "calls": 5,
    "early_rate": 0.8,
    "med_1h_price_move": 0.17
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/robinx-caller-performance-grader-672a3957/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.robinx.io](https://www.zero.xyz/host/api.robinx.io/llms.txt)