# BaseBuilder Crypto Gas Recommendation

> BaseBuilder Crypto Gas Recommendation is a paid API for AI agents from bb-crypto.vercel.app, paid per call via x402, $0.107314/call, status unknown (last checked 2026-09-15).

Returns gas price recommendations for Ethereum/EVM transactions based on current network conditions

## Facts

- Endpoint: POST https://bb-crypto.vercel.app/api/gas/recommendation
- Price: $0.107314/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-crypto-gas-recommendation-8cf7d6a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dW1pvPx_ddfbqNHzHtIKf

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-gas-recommendation-8cf7d6a0 -d '<json body>'
```

Example prompt: What gas price should I use for a standard ETH transfer right now — give me a recommendation for fast confirmation without overpaying.

## When to prefer this

Use this endpoint when you need real-time gas fee recommendations for EVM-compatible chains and want tiered suggestions (slow/standard/fast) to help users optimize transaction costs. Prefer this over manual RPC calls when you need a curated, monetized recommendation rather than raw fee history data.

## Known failure modes

- Network unavailable — upstream RPC node unreachable, returns 5xx error
- Invalid network specified — returns 400 with unsupported chain message
- Payment not received — returns 402 Payment Required if x402 payment header missing or invalid
- Rate limit exceeded — too many requests in a short window

## How this service works

BaseBuilder Crypto API hub - 26 paid endpoints

## Output

Returns recommended gas fee tiers (e.g. slow, standard, fast) with corresponding base fee and priority fee values in Gwei, and estimated confirmation times or costs for EVM transactions.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-crypto-gas-recommendation-8cf7d6a0/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)