# RTK Motion Robot Trajectory (RoboTarget)

> RTK Motion Robot Trajectory (RoboTarget) is a paid API for AI agents from api.rtkmotion.io, paid per call via x402, $15/call, status unknown (last checked 2026-10-10).

Returns 4D motion-capture trajectory data in NPZ format for a specified humanoid robot and human subject, including a signed download URL for the binary file.

## Facts

- Endpoint: GET https://api.rtkmotion.io/paid/robotarget?utm_source=zero.xyz
- Price: $15/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rtk-motion-robot-trajectory-robotarget-d3304cb5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8AxZ_SqG1jI7nv45ilm8s

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 rtk-motion-robot-trajectory-robotarget-d3304cb5
```

Example prompt: Pull the RTK Motion robot trajectory for a Unitree G1 (43 DOF) using subject_1 — I need the NPZ file download URL and the compatible platforms it works with.

## When to prefer this

Choose this endpoint when you need structured, cryptographically signed 4D humanoid robot motion-capture trajectories in NPZ format that are directly compatible with MoveIt, ROS, or NVIDIA Isaac. It is specifically suited for robotics pipelines that need per-robot-model (G1, H1, Apollo) retargeted trajectory data with provenance guarantees, rather than raw human biomechanics or rehabilitation data available on sibling endpoints.

## Known failure modes

- Invalid robot value (not g1/h1/apollo) returns 400 or error payload
- Invalid subject value returns 400 or error payload
- Payment not completed or x402 flow not followed returns 402 Payment Required
- Download URL expiry (900 seconds) — expired URL returns 403 or 404
- Network timeout on binary NPZ download from signed URL
- SHA256 mismatch indicating data integrity issue on client side

## How this service works

RTK Motion — 4D motion-capture data and AI agents for robotics and human-movement intelligence.

## Output

Returns JSON metadata including: frames-per-second (60), byte size, robot model used, domain label, NPZ format descriptor, lesson path, SHA256 hash, subject ID, a time-limited download URL (expires in 900 seconds), compatible platforms (MoveIt, ROS, Isaac), ECDSA provenance signature and signer address, and robot spec (DOF, class, vendor, body/hand DOF breakdown). The binary NPZ trajectory file itself must be fetched separately via the download_url before expiry.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "robot": {
       "type": "string",
       "description": "'g1' (Unitree 43 DOF, default), 'h1' (Unitree 19 DOF), or 'apollo' (Apptronik 32 DOF)."
      },
      "subject": {
       "type": "string",
       "description": "Subject to retrieve: 'subject_1' (default) or 'subject_2'."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "fps": 60,
  "bytes": 213904,
  "robot": "g1",
  "domain": "Robot Trajectory",
  "format": "NPZ",
  "lesson": "BJJ/Training/KimuraFromSideControl/Lesson001",
  "sha256": "…",
  "subject": "subject_1",
  "next_step": {
   "note": "NPZ is binary; this response is metadata only. Redeem download_url before expiry.",
   "action": "GET download_url to retrieve the NPZ trajectory file",
   "required": true,
   "expires_in_seconds": 900
  },
  "compatible": [
   "MoveIt",
   "ROS",
   "Isaac"
  ],
  "provenance": {
   "algorithm": "secp256k1-ECDSA",
   "signed_by": "0x6C11F8a21f7ca922F483Ed21C3b6c2d9B305B10C"
  },
  "robot_spec": {
   "dof": 43,
   "class": "consumer",
   "vendor": "Unitree",
   "dof_body": 29,
   "dof_hand": 14
  },
  "download_url": "https://api.rtkmotion.io/data/…"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rtk-motion-robot-trajectory-robotarget-d3304cb5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.rtkmotion.io](https://www.zero.xyz/host/api.rtkmotion.io/llms.txt)