# Synapse API — Robinhood Transaction History

> Synapse API — Robinhood 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 blockchain transaction history for a given address, filtered by block range, category, and direction, across multiple networks

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/robinhood/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-robinhood-transaction-history-ef05aa52
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FBTEgrTs1zgIgP362kqhi

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-robinhood-transaction-history-ef05aa52 -d '<json body>'
```

Example prompt: Pull the last 50 transactions sent from wallet address 0xABC...123, sorted newest first, including only ERC-20 token transfers, and include full metadata for each transaction.

## When to prefer this

Use this endpoint when you need to query historical on-chain transaction data for a specific wallet address with flexible filtering by block range, transaction category, direction, and pagination support. Prefer this over raw RPC calls when you need a clean REST interface with pay-per-call pricing and no node infrastructure setup.

## Known failure modes

- Invalid or malformed wallet address returns an error
- fromBlock greater than toBlock causes empty or error response
- Unsupported category strings may be ignored or cause errors
- pageKey from a different query may cause unexpected results
- maxCount exceeding allowed limits may be capped or rejected
- Network timeouts on large block ranges

## 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 paginated list of blockchain transactions matching the specified filters, including transfer direction, block numbers, addresses, amounts, category labels, and optionally full transaction metadata. Includes a pageKey for fetching subsequent pages.

## 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-robinhood-transaction-history-ef05aa52/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)