# Synapse API — Polygon Transaction History

> Synapse API — Polygon 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 2026-09-14).

Retrieves paginated transaction history for addresses on the Polygon blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/polygon/tx/history
- 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-polygon-transaction-history-2039983b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bmoGXsFRba0jGSeMoHqTZ

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-polygon-transaction-history-2039983b -d '<json body>'
```

Example prompt: Pull the last 100 transactions for Polygon address 0xAbCd...1234, sorted newest-first, include metadata, and skip zero-value transfers.

## When to prefer this

Use this endpoint when you need historical on-chain transaction data for a specific address on the Polygon network, especially when you need filtering by block range, transaction category (ERC-20, NFT, internal, etc.), direction (from/to), or need paginated access to large transaction sets. Prefer this over Ethereum or other chain endpoints when the target wallet activity is on Polygon/MATIC specifically.

## Known failure modes

- Invalid address format returns an error or empty result
- fromBlock/toBlock out of range or malformed causes query failure
- maxCount exceeding API limits may be capped or rejected
- Invalid category strings return no results or an error
- pageKey expiry causes pagination to fail with an error
- Network timeout if block range spans too many blocks

## 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 asset transfers on the Polygon network matching the specified filters, including transaction hashes, block numbers, from/to addresses, asset categories, values, and optionally full transaction metadata. A pageKey is returned when more results are available for subsequent pagination calls.

## 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-polygon-transaction-history-2039983b/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)