# Assay Systems — The Extract (Solo Endpoint)

> Assay Systems — The Extract (Solo Endpoint) is a paid API for AI agents from assay-systems.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Queries the public government contract register to return buyer-supplier relationship data, lock information, or buyer market shares for a given country or company.

## Facts

- Endpoint: GET https://assay-systems.com/api/v1/solo?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/assay-systems-the-extract-solo-endpoint-d884ea91
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zzGobWu8qH1aFdc1P6d-F

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 assay-systems-the-extract-solo-endpoint-d884ea91
```

Example prompt: Pull the buyer-supplier pairs from the public contract register for Canada — search for the supplier 'Palantir' and show me the first page of results.

## When to prefer this

Use this endpoint when you need structured, computed intelligence about public government procurement — specifically buyer-supplier relationships, contract lock patterns, or buyer market share — derived from the public contract register. It is best suited for market research on government sector activity for a specific company or country, particularly when you want pre-computed analytics rather than raw document search.

## Known failure modes

- Missing or invalid country code returns a country list instead of filtered results
- Unrecognized 'kind' enum value may return an error or empty data
- Supplier or buyer name strings with no matches return empty data sets
- Pagination beyond available pages returns empty results
- Payment failure (x402) blocks access to the endpoint

## How this service works

The government market in your sector. One document about one company, computed from the public contract register.

## Output

Returns a JSON object with a 'data' field containing either: a list of buyer-supplier contract pairs, lock relationship data, or buyer market share breakdowns for the specified country. Without a country parameter, returns a list of available countries with their contract counts.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "kind": {
   "enum": [
    "pairs",
    "locks",
    "buyers"
   ],
   "type": "string",
   "description": "With country: buyer-supplier pairs, locks or buyers' shares"
  },
  "page": {
   "type": "integer",
   "description": "With country: page of rows"
  },
  "buyer": {
   "type": "string",
   "description": "With country: words of the buyer's name"
  },
  "country": {
   "type": "string",
   "description": "Two-letter country code; without it the answer lists countries and counts"
  },
  "supplier": {
   "type": "string",
   "description": "With country: words of the supplier's name"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "data"
 ],
 "properties": {
  "data": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/assay-systems-the-extract-solo-endpoint-d884ea91/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from assay-systems.com](https://www.zero.xyz/host/assay-systems.com/llms.txt)