# Receipts Index – AI Engine Business Mention Corpus

> Receipts Index – AI Engine Business Mention Corpus is a paid API for AI agents from api.receiptsindex.com, paid per call via x402, $540/call, status unknown (last checked 2026-10-31).

Returns dated CSV rows showing which US local businesses AI engines named in response to fixed buyer questions, enabling AI visibility tracking.

## Facts

- Endpoint: GET https://api.receiptsindex.com/v1/corpus?utm_source=zero.xyz
- Price: $540/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/receipts-index-ai-engine-business-mention-corpus-c0016e99
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mHtpuRXWYNEpf0UrO4YyC

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 receipts-index-ai-engine-business-mention-corpus-c0016e99
```

Example prompt: Pull the Receipts Index corpus for US businesses in the AI visibility niche to see which companies Grok named when buyers asked who the best AI visibility service is — I want the dated rows with competitors mentioned and sources cited.

## When to prefer this

Choose this endpoint when you need empirical, dated evidence of which businesses AI engines actually name in response to buyer queries — particularly for AI visibility auditing, competitive benchmarking, or brand monitoring across multiple AI engines (ChatGPT, Grok, etc.) for US local business niches. It is preferable over manual AI querying because it provides structured, reproducible, timestamped data across standardized prompt variants.

## Known failure modes

- Payment required (HTTP 402) when requesting paid rows beyond the free index sample
- Malformed filter parameters may return empty result sets
- Large corpora may return truncated CSV requiring pagination
- Engine or niche not covered in the index returns no matching rows
- Rate limiting on repeated free-tier calls

## How this service works

Dated rows of which US local businesses AI engines name for fixed buyer questions. Free index and sample; paid rows over x402. Remote MCP at /mcp.

## Output

A CSV-formatted dataset with columns: date_utc, check_id, business, niche, market, engine, prompt_variant, run, business_mentioned (boolean), competitors_named (semicolon-separated list), sources_cited, run_channel, and flags. Each row represents one AI engine run against a fixed buyer question, showing whether the target business was mentioned and which competitors or sources were cited instead.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "text",
 "format": "csv",
 "example": "date_utc,check_id,business,niche,market,engine,prompt_variant,run,business_mentioned,competitors_named,sources_cited,run_channel,flags\n2026-09-01,NB-CZ-GROK-1,Namebeam,AI visibility,US,grok,Who is the best AI visibility service that checks whether ChatGPT recommends my business?,1,false,Profound; Otterly.ai; Peec AI; Semrush AI Toolkit; Ahrefs Brand Radar; Scrunch,Aboutmartech,grok_web_fast,clean\n2026-09-01,NB-CZ-GROK-2,Namebeam,AI visibility,US,grok,\"Which company publishes its own AI-visibility results, wins and losses, with dated transcripts?\",1,false,none named; Brandlight referenced as adjacent,Sat.brandlight,grok_web_fast,clean"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/receipts-index-ai-engine-business-mention-corpus-c0016e99/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.receiptsindex.com](https://www.zero.xyz/host/api.receiptsindex.com/llms.txt)