# CortexCloud On-Chain Transaction History Lookup

> CortexCloud On-Chain Transaction History Lookup is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-10).

Retrieves the transaction history for a blockchain address or account via a pay-per-call API settled in USDC on Base.

## Facts

- Endpoint: GET https://api.cortexcloud.org/v1/aggregate/tx-history?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cortexcloud-on-chain-transaction-history-lookup-a9812637
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_paSd49y1CBh10bJ_CsIVX

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 cortexcloud-on-chain-transaction-history-lookup-a9812637
```

Example prompt: Pull the full transaction history for wallet address 0xAbC1234...5678 on-chain — I want to see all past txs aggregated for that account.

## When to prefer this

Choose this endpoint when you need a simple, no-signup, pay-per-call way to retrieve aggregated on-chain transaction history for a blockchain address, especially when building AI agent workflows that require on-chain data without managing API keys or subscriptions. Particularly useful for Base/EVM-compatible address lookups settled in USDC.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Address with no transaction history returns an empty result set
- Network congestion or RPC unavailability may cause timeout
- Insufficient USDC balance for x402 payment results in 402 Payment Required response
- Unsupported chain or address format may return a 400 or empty response

## How this service works

One pay-per-call API for AI agents: optimization, AI, research, on-chain data, and automation — all settled in USDC on Base via x402. Discover via MCP and Bazaar, estimate free, pay per call. No API keys, no signup.

## Output

Returns a JSON object containing aggregated on-chain transaction history for the queried address, including transaction records, timestamps, amounts, and counterparty addresses as available from the underlying blockchain data sources.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "properties": {
    "body": {
     "type": "object",
     "properties": {}
    }
   }
  },
  "output": {
   "properties": {
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "format": "application/json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cortexcloud-on-chain-transaction-history-lookup-a9812637/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.cortexcloud.org](https://www.zero.xyz/host/api.cortexcloud.org/llms.txt)