# Synapse API — SEI Token Transfers

> Synapse API — SEI Token Transfers 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 token transfer history for a given owner address on the SEI blockchain, with filtering by block range, contract, and pagination.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/sei/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-sei-token-transfers-776c856d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ltZdXQepjPpex0OdGshON

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-sei-token-transfers-776c856d -d '<json body>'
```

Example prompt: Pull all token transfers for SEI address 0xAbC123... from block 1000000 to 1050000, sorted descending, and return up to 50 results — filter to just the contract at 0xDef456...

## When to prefer this

Use this endpoint when you need on-chain token transfer history specifically for the SEI blockchain. It supports block-range filtering, multi-contract filtering, and pagination, making it suitable for auditing wallet activity, building transaction histories, or monitoring token flows on SEI. Prefer this over generic blockchain explorers when you need structured, machine-readable output and pay-per-call pricing without a subscription.

## Known failure modes

- Invalid or malformed owner address returns an error or empty result
- fromBlock/toBlock out of range or in wrong format causes a bad request
- Invalid contractAddresses array entries may be silently ignored or cause errors
- Exceeded maxCount cap may truncate results without warning
- Stale or invalid pageKey returns an error or restarts pagination
- Payment failure via x402 returns 402 before any data is returned

## 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 address on the SEI blockchain, including details such as from/to addresses, token contract, block number, transaction hash, and transfer amount. 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-sei-token-transfers-776c856d/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)