# Synapse API — Base Token Transfers Lookup

> Synapse API — Base Token Transfers Lookup 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 2026-09-15).

Retrieves token transfer history for a given owner address on the Base blockchain, with filtering by block range, contract addresses, and pagination support.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/base/token/transfers
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-base-token-transfers-lookup-448bf793
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FitPMj_PAtglPBc-Xc5bJ

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-base-token-transfers-lookup-448bf793 -d '<json body>'
```

Example prompt: Show me all token transfers for the wallet 0xAbC...123 on Base, sorted from newest to oldest, limiting to the last 50 transfers, and only for the USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.

## When to prefer this

Use this endpoint when you need on-chain token transfer history specifically on the Base network for a given wallet or contract. Prefer it over generic blockchain explorers when you need structured, paginated, filterable data consumable by an agent without screen-scraping. It supports pay-per-call via x402 (USDC micropayments), making it suitable for agent workflows that need cost-controlled, programmatic access to Base transfer data.

## Known failure modes

- Invalid or malformed owner address returns an error or empty result
- Unknown or unsupported contract address yields no transfers
- Block range out of bounds or reversed fromBlock/toBlock causes an error
- Invalid pageKey from a previous query may return an error or restart pagination
- Exceeding maxCount limits may truncate results silently
- Network or provider downtime returns a 5xx error

## 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

Returns a list of token transfer events for the specified owner on Base, including transaction hash, block number, from/to addresses, token contract, value, and asset metadata. Supports pagination via a page key for large result sets.

## 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-base-token-transfers-lookup-448bf793/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)