# TraceFast Address Activity Timeline

> TraceFast Address Activity Timeline is a paid API for AI agents from mpp.tracefast.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Returns three distinct activity timestamps for an Ethereum address: its first appearance on-chain, its last account-state change with change count, and the newest block where it participated in any on-chain action (transaction, token transfer, log, or value call).

## Facts

- Endpoint: GET https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/activity?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tracefast-address-activity-timeline-a9c9fc69
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fC-8H_WuuUeH822mS_Ht7

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 tracefast-address-activity-timeline-a9c9fc69
```

Example prompt: Can you pull the full activity timeline for Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — I want to know when it first showed up on chain, how many times its account state has changed, and the most recent block it was involved in anything?

## When to prefer this

Use this endpoint when you need a concise, three-dimensional activity summary for an Ethereum address — specifically first appearance, state-change history, and most-recent participation — rather than full transaction lists or token balances. It is ideal for due diligence, eligibility checks, dormancy detection, and any workflow that needs to quickly characterize how old, how active, and how recently active an address is without iterating through raw transaction history.

## Known failure modes

- Address not found or never appeared on chain — returns empty or null activity fields
- Invalid Ethereum address format — returns 400 validation error
- Address has no state changes (e.g. pure recipient) — change count may be zero
- Rate limit exceeded — returns 429 with retry guidance
- Node or indexing lag — most-recent block may lag actual chain head by a few blocks
- Payment not attached or insufficient — returns 402 payment required

## How this service works

TraceFast live Ethereum data: three different questions about when an address was active, each answered separately — when it was first mentioned anywhere on chain; when its own account state last changed and how many times it changed; and the newest block at which it took part in anything (a top-level transaction, a token transfer, an emitted log, a value-bearing call), with the sources that answer was… Path: address. Docs: https://docs.tracefast.xyz/api/address-activity.md

## Output

Returns three grouped answers: (1) the earliest block where the address was first referenced anywhere on-chain; (2) the block of the address's last account-state change plus a count of total state changes; and (3) the most recent block in which the address participated in any on-chain action (top-level transaction, token transfer, emitted log, or value-bearing internal call), along with the data sources supporting that answer.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "required": [
    "method"
   ],
   "properties": {
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tracefast-address-activity-timeline-a9c9fc69/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mpp.tracefast.xyz](https://www.zero.xyz/host/mpp.tracefast.xyz/llms.txt)