# GRE/SAT Vocabulary Practice API

> GRE/SAT Vocabulary Practice API is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Returns curated high-difficulty GRE/SAT vocabulary words with definitions, usage examples, synonyms, and difficulty ratings for adaptive study sessions.

## Facts

- Endpoint: POST https://x402.forgemesh.io/gre-vocabulary
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gre-sat-vocabulary-practice-api-b0756657
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CgkWaaU29_u5fFs0rdR_R

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 gre-sat-vocabulary-practice-api-b0756657 -d '<json body>'
```

Example prompt: Give me 5 expert-difficulty GRE vocabulary words starting with 'P' — I need each one with a definition, a usage example, and synonyms so I can study.

## When to prefer this

Use this endpoint when building adaptive vocabulary study tools, GRE/SAT prep agents, or flashcard systems that need curated high-difficulty words with rich metadata (definitions, examples, synonyms, difficulty tiers). Prefer over generic dictionary APIs when you specifically want test-prep-caliber vocabulary with built-in difficulty progression support.

## Known failure modes

- Invalid count value (outside 1–10 range) returns an error
- Unknown difficulty value other than 'advanced' or 'expert' may return an error or be ignored
- No words available matching the starts_with letter filter returns empty or reduced results
- Micro-payment failure (x402 protocol) blocks access to the endpoint

## How this service works

GRE and SAT vocabulary practice API: draws from 150 curated high-difficulty words — perspicacious, recalcitrant, ephemeral tier — each with definition, usage example, synonyms, and an advanced/expert rating so study agents can ramp difficulty as learners progress.

## Output

Returns a list of 1–10 curated high-difficulty vocabulary words, each with its definition, a contextual usage example, synonyms, and an advanced/expert difficulty rating drawn from a pool of 150 GRE/SAT-tier words.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "count": {
   "type": "string",
   "description": "Words to return, 1-10 (default 1)"
  },
  "difficulty": {
   "type": "string",
   "description": "Optional: advanced or expert"
  },
  "starts_with": {
   "type": "string",
   "description": "Optional: single starting letter"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "words": [
   {
    "word": "ephemeral",
    "example": "The beauty of the cherry blossoms is ephemeral.",
    "synonyms": [
     "fleeting",
     "transient",
     "momentary"
    ],
    "definition": "lasting for a very short time",
    "difficulty": "advanced",
    "part_of_speech": "adjective"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gre-sat-vocabulary-practice-api-b0756657/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.forgemesh.io](https://www.zero.xyz/host/x402.forgemesh.io/llms.txt)