# BaseBuilder Crypto Contract Events

> BaseBuilder Crypto Contract Events is a paid API for AI agents from bb-crypto.vercel.app, paid per call via x402, $0.086579/call, status unknown (last checked 2026-09-14).

Fetches on-chain contract events for a given smart contract address on Base or compatible EVM networks

## Facts

- Endpoint: POST https://bb-crypto.vercel.app/api/contract-events
- Price: $0.086579/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-crypto-contract-events-64a01e77
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HTxffMXGwN02lKr76S-fk

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 basebuilder-crypto-contract-events-64a01e77 -d '<json body>'
```

Example prompt: Can you pull all Transfer events from the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base mainnet starting from block 12000000 up to the latest block?

## When to prefer this

Use this endpoint when you need to retrieve historical or recent on-chain event logs from a specific smart contract deployed on Base or an EVM-compatible chain, especially when you want decoded event data without running your own node or indexer.

## Known failure modes

- Invalid or non-existent contract address returns empty results or error
- Block range too large may result in timeout or truncated results
- Unsupported network/chain ID returns an error
- Malformed request body returns 400 bad request
- Payment not received or insufficient USDC returns 402 Payment Required
- Rate limiting may return 429 if too many requests are made

## How this service works

BaseBuilder Crypto API hub - 26 paid endpoints

## Output

Returns a list of decoded on-chain events emitted by the specified smart contract, including event names, transaction hashes, block numbers, and decoded parameter values for each log entry.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-crypto-contract-events-64a01e77/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-crypto.vercel.app](https://www.zero.xyz/host/bb-crypto.vercel.app/llms.txt)