# Annalist x402 Service Checks - Top Ranked

> Annalist x402 Service Checks - Top Ranked is a paid API for AI agents from api.annalist.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-14).

Returns a ranked list of x402 services graded by organic payer activity and quality signals over the past 30 days

## Facts

- Endpoint: GET https://api.annalist.dev/v1/checks/top?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/annalist-x402-service-checks-top-ranked-d4255750
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Pepbp972z5AiiIUHzHo7y

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 annalist-x402-service-checks-top-ranked-d4255750
```

Example prompt: Show me the top-ranked x402 services by organic payer activity so I can find trustworthy APIs for my agent to call — I want to see their quality grades and how many real payers each had in the last 30 days.

## When to prefer this

Choose this endpoint when you need an independent, usage-verified ranking of x402 services rather than a self-reported directory listing. It is especially valuable when vetting APIs before integrating them into an autonomous agent, since organic payer counts and letter grades reflect real-world adoption rather than marketing claims.

## Known failure modes

- Payment not received or x402 handshake fails — returns 402 with payment details
- No data available for requested filter properties — returns empty array
- Service temporarily unavailable — returns 5xx error
- Invalid query parameters — returns 400 with error message

## How this service works

Signed data for AI agents, paid per call over x402. Hyperliquid crowd state, smart money and liquidations with what historically happened next, plus independent checks of x402 services and MCP servers.

## Output

A JSON object containing a ranked list of x402 service hosts, each with a quality grade (e.g. A, B, C) and a count of organic payers over the past 30 days. Useful for identifying trustworthy, actively-used paid-per-call APIs.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "most_organic_payers": [
    {
     "host": "api.example.com",
     "grade": "A",
     "organic_payers_30d": 412
    }
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/annalist-x402-service-checks-top-ranked-d4255750/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.annalist.dev](https://www.zero.xyz/host/api.annalist.dev/llms.txt)