# TraceFast Address Counterparties

> TraceFast Address Counterparties is a paid API for AI agents from mpp.tracefast.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Returns up to 100 top counterparty addresses that an Ethereum address has interacted with, ranked by transaction frequency across top-level calls, internal calls, and token transfers

## Facts

- Endpoint: GET https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/counterparties
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tracefast-address-counterparties-db8bcae7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TwMkBl8Z2dLtfujSIGnU9

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-counterparties-db8bcae7
```

Example prompt: Show me the top 20 counterparties of the Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — I want to see which addresses it interacts with most and how many transactions each one has.

## When to prefer this

Use this endpoint when you need to map the social or transactional graph of a specific Ethereum address — especially to identify key counterparties, frequent contract interactions, or token transfer partners. It is ideal for compliance checks, whale tracking, DeFi due diligence, and on-chain behavior analysis. Choose this over raw transaction APIs when you want pre-ranked, deduplicated counterparty summaries rather than raw transaction lists. The optional block parameter makes it uniquely suited for historical snapshots at a specific chain state.

## Known failure modes

- Invalid Ethereum address format (not 0x-prefixed 40 hex characters) returns an error
- Block number out of range or not yet mined returns an error
- Limit outside 1–100 range returns a validation error
- Address with no on-chain history returns an empty list
- Payment not included or insufficient triggers x402 payment required response
- Network or RPC timeout returns a 5xx error

## How this service works

TraceFast knowledge graph: top counterparties of an Ethereum address, current or as of a block. Up to 100 addresses it interacts with most, ranked by successful transactions across top-level calls, internal calls and token transfers, each with transaction counts and first/last block. Path address: 0x-prefixed, 40 hex. Query block: integer, state at the end of this block, absent = current; limit: integer 1..100, default 100. Docs: https://docs.tracefast.xyz/api/address-counterparties.md

## Output

A ranked list of up to 100 Ethereum addresses that the queried address has interacted with most, including: counterparty address, total successful transaction count (across top-level calls, internal calls, and token transfers), and the first and last block numbers of interaction. Results are ordered by interaction frequency descending.

## 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-counterparties-db8bcae7/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)