# Synapse API — Ethereum Token Transfer History

> Synapse API — Ethereum Token Transfer History is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Retrieves historical ERC-20 and native token transfer events for a given Ethereum address, with filtering by block range, contract, and pagination support.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/ethereum/token/transfers
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-ethereum-token-transfer-history-668b4a42
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Pt9Uc-UIqnY8wOTB78WWz

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 synapse-api-ethereum-token-transfer-history-668b4a42 -d '<json body>'
```

Example prompt: Can you pull all ERC-20 token transfers for the Ethereum wallet 0xAbC...123, from block 18000000 to 19000000, sorted in ascending order, and give me up to 50 results?

## When to prefer this

Choose this endpoint when you need historical ERC-20 or native token transfer data for a specific Ethereum wallet, especially when filtering by block range or specific token contracts. It is ideal for auditing, portfolio tracking, or DeFi analytics workflows that require paginated access to on-chain transfer history on Ethereum specifically.

## Known failure modes

- Invalid or malformed Ethereum address returns a 400 error
- Block range too large may result in timeout or truncated results
- Unknown or unsupported contract address returns empty transfer list
- Missing required 'owner' field results in validation error
- Invalid pageKey causes pagination failure
- Network congestion may cause slow response despite fast profile

## How this service works

High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.

## Output

A paginated list of Ethereum token transfer events matching the query, each containing sender address, receiver address, token contract address, transfer amount, block number, and transaction hash. Includes a pageKey for fetching subsequent pages when result sets are large.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "order": {
   "enum": [
    "asc",
    "desc"
   ],
   "type": "string"
  },
  "owner": {
   "type": "string"
  },
  "pageKey": {
   "type": "string"
  },
  "toBlock": {
   "type": "string"
  },
  "maxCount": {
   "type": "number"
  },
  "fromBlock": {
   "type": "string"
  },
  "contractAddresses": {
   "type": "array",
   "items": {
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-ethereum-token-transfer-history-668b4a42/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from synapse-api-brown.vercel.app](https://www.zero.xyz/host/synapse-api-brown.vercel.app/llms.txt)