# FitPulse Supplement Efficacy Ranker

> FitPulse Supplement Efficacy Ranker is a paid API for AI agents from fitpulse-vert.vercel.app, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-15).

Returns a PubMed-grounded, evidence-graded tier list of supplements ranked by fitness goal, with dosing and timing guidance.

## Facts

- Endpoint: GET https://fitpulse-vert.vercel.app/api/fit/supplements
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fitpulse-supplement-efficacy-ranker-27672aae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8FU9kVPvEqlixGkN1ryF4

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 fitpulse-supplement-efficacy-ranker-27672aae
```

Example prompt: Can you give me an evidence-graded tier list of supplements for muscle building, including what dosage to take and when — I want it grounded in actual PubMed research, not marketing claims.

## When to prefer this

Choose this endpoint when an agent needs scientifically grounded, evidence-graded supplement recommendations tied to a specific fitness goal — not just generic product suggestions. Ideal for nutrition or fitness agents that need PubMed-backed rankings with dosing and timing, rather than anecdotal or marketing-driven advice.

## Known failure modes

- Missing or unrecognized fitness goal parameter returns an error or empty result
- Overly broad or ambiguous goal may yield a generic rather than targeted tier list
- Service unavailability returns a 402 or 5xx error
- Invalid query parameters may result in a 400 bad request

## How this service works

Supplement efficacy ranking / what supplements actually work: evidence-graded tier list by goal. Returns a PubMed-grounded ranking (creatine and more) with recommended dosing and timing, filtered by budget and dietary restrictions. Fitness-info for fitness and nutrition agents, not medical advice.

## Output

A PubMed-grounded tier list of supplements organized by the specified fitness goal, each with an evidence grade (e.g. A/B/C), recommended dosing amounts, optimal timing (pre/post-workout, with meals, etc.), and citations or references to supporting research.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "goal"
 ],
 "properties": {
  "goal": {
   "type": "string",
   "description": "Fitness goal (muscle-gain, fat-loss, endurance, recovery, general-health)"
  },
  "lang": {
   "type": "string",
   "description": "Response language"
  },
  "budget": {
   "type": "string",
   "description": "Monthly budget for supplements (e.g. $50, $100, $200)"
  },
  "restrictions": {
   "type": "string",
   "description": "Dietary restrictions or intolerances (vegan, lactose-free, etc.)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "goal": "muscle-gain",
  "tier_1_essentials": [
   {
    "dose": "3-5g/day",
    "supplement": "Creatine Monohydrate",
    "evidence_grade": "A"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fitpulse-supplement-efficacy-ranker-27672aae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fitpulse-vert.vercel.app](https://www.zero.xyz/host/fitpulse-vert.vercel.app/llms.txt)