# Synapse API — Superseed Transaction History

> Synapse API — Superseed Transaction 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 2026-09-13).

Retrieves paginated transaction history for addresses on the Superseed blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/superseed/tx/history
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-superseed-transaction-history-d5c7745d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r_tT8Xr57KCGBDFUBD2Xb

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-superseed-transaction-history-d5c7745d -d '<json body>'
```

Example prompt: Pull the last 50 transactions for Superseed address 0xABC...123, sorted newest first, and include full metadata — I want to see both incoming and outgoing transfers.

## When to prefer this

Use this endpoint when you specifically need on-chain transaction history for addresses on the Superseed network, particularly when you need block-range filtering, category-based filtering, pagination, and optional metadata enrichment. Prefer this over generic block explorers when you need structured JSON output suitable for programmatic processing by an AI agent.

## Known failure modes

- Invalid address format returns a 400 error
- Invalid block range (fromBlock > toBlock) may return empty results or an error
- pageKey mismatch or expiry causes pagination failure
- maxCount exceeding allowed limits may be capped or rejected
- Network or RPC downtime returns a 500 or timeout error
- Unsupported category values may return empty results

## 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 asset transfer transactions on the Superseed blockchain matching the specified filters, including block numbers, sender/receiver addresses, token amounts, transaction hashes, and optional metadata. Also returns a pageKey for cursor-based pagination when more results are available.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "order": {
   "enum": [
    "asc",
    "desc"
   ],
   "type": "string"
  },
  "pageKey": {
   "type": "string"
  },
  "toBlock": {
   "type": "string"
  },
  "category": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "maxCount": {
   "type": "number"
  },
  "fromBlock": {
   "type": "string"
  },
  "toAddress": {
   "type": "string"
  },
  "fromAddress": {
   "type": "string"
  },
  "withMetadata": {
   "type": "boolean"
  },
  "excludeZeroValue": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-superseed-transaction-history-d5c7745d/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)