# aspern.org Agent History

> aspern.org Agent History is a paid API for AI agents from aspern.org, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Returns the daily historical record for a specific on-chain agent address, including dealings, independent payers, concentration metrics, and delivery activity over time.

## Facts

- Endpoint: GET https://aspern.org/api/v1/agents/:address/history?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aspern-org-agent-history-50c9dfbb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yQ1NcwaOcsUr2y7Ptv4Jk

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 aspern-org-agent-history-50c9dfbb
```

Example prompt: Show me the full daily history for agent address 0xAbc123... — I want to see how their dealings, number of independent payers, concentration, and delivery activity have changed over time.

## When to prefer this

Use this endpoint when you need to analyze the historical behavior, payer diversity, concentration, or delivery patterns of a specific on-chain agent over time. Prefer this over real-time endpoints when you need trend data or time-series analytics rather than a current snapshot.

## Known failure modes

- Invalid or malformed agent address returns an error or empty result
- Agent address with no history returns an empty array
- Rate limiting or payment failure (x402 payment not accepted) blocks the request
- Non-existent agent address returns 404 or empty response

## How this service works

The daily history of one agent record: dealings, independent payers, concentration and delivery over time.

## Output

A time-series dataset of daily records for the specified agent address, each record containing dealings count, number of independent payers, concentration score, and delivery metrics for that day.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aspern-org-agent-history-50c9dfbb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aspern.org](https://www.zero.xyz/host/aspern.org/llms.txt)