# Synapse API — Metis Transaction History

> Synapse API — Metis 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 2026-10-13).

Fetches paginated transaction history for a given address on the Metis blockchain network, with filtering by block range, category, and address.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/metis/tx/history?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-metis-transaction-history-279895f5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FrtO1rD7Y76EmmCyRxRKC

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-metis-transaction-history-279895f5 -d '<json body>'
```

Example prompt: Pull the last 25 transactions sent from Metis address 0xAbC123... to 0xDeF456..., sorted newest first, including metadata and filtering out zero-value transfers.

## When to prefer this

Use this endpoint when you specifically need transaction history on the Metis Layer 2 blockchain network and want flexible filtering by address, block range, category, and sort order via a simple pay-per-call API without managing your own node infrastructure.

## Known failure modes

- Invalid or malformed address returns an error or empty result
- Block range too large may cause timeout or truncated results
- Invalid pageKey causes pagination failure
- Unsupported category values may return empty or error
- Missing required address fields may return all transactions or an 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

A paginated list of transactions on the Metis network matching the specified filters, including transfer details, block numbers, addresses, asset categories, and optionally full metadata. A pageKey is returned 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-metis-transaction-history-279895f5/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)