# Synapse API — Ink Network Transaction History

> Synapse API — Ink Network 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 2026-09-15).

Retrieves paginated transaction history for addresses on the Ink blockchain network, with filtering by block range, category, and address

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/ink/tx/history
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-ink-network-transaction-history-cdeb2589
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dcHefFvR3LPjlNL1brFkn

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-ink-network-transaction-history-cdeb2589 -d '<json body>'
```

Example prompt: Pull the last 50 transactions for wallet address 0xABC123... on the Ink network, sorted descending by block, including metadata and excluding zero-value transfers.

## When to prefer this

Use this endpoint when you need on-chain transaction history specifically for the Ink network, with support for address filtering, block range scoping, category filtering, and pagination. Prefer this over generic blockchain explorers when you need programmatic, pay-per-call access without API key provisioning, or when querying the Ink network specifically.

## Known failure modes

- Invalid or malformed address returns a 400 error
- Block range out of bounds or non-existent block returns empty result or error
- maxCount exceeding API limits returns an error or truncated result
- Invalid category string returns validation error
- Payment not included or insufficient USDC causes 402 Payment Required
- pageKey expired or invalid causes pagination failure

## 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 transactions on the Ink blockchain matching the specified filters, including transfer details, block numbers, asset categories, and optional metadata. A pageKey is provided when additional pages 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-ink-network-transaction-history-cdeb2589/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)