# BaseBuilder DeFi Bridge Routes

> BaseBuilder DeFi Bridge Routes is a paid API for AI agents from bb-defi.vercel.app, paid per call via x402, $0.168858/call, status unknown (last checked 2026-09-14).

Returns available cross-chain bridge routes for token transfers between blockchain networks

## Facts

- Endpoint: POST https://bb-defi.vercel.app/api/bridge/routes
- Price: $0.168858/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-defi-bridge-routes-9fa06883
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mR1xRhNjpE7UISTntUr8c

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-defi-bridge-routes-9fa06883 -d '<json body>'
```

Example prompt: Find me all available bridge routes to move 100 USDC from Ethereum mainnet to Base, and show me the estimated fees and transfer times for each option.

## When to prefer this

Use this endpoint when you need to discover available cross-chain bridge routes before executing a transfer, especially in the Base ecosystem. Prefer this over generic DEX aggregators when the user needs to move tokens between L1/L2 networks rather than swap on a single chain.

## Known failure modes

- Unsupported chain pair returns empty routes or error
- Invalid token address returns 400 bad request
- No liquidity available on requested route
- Payment of ~$0.17 USDC required per call via x402 protocol or 402 error returned
- Amount too small or too large for available bridges

## How this service works

BaseBuilder Defi API hub - 22 paid endpoints

## Output

A list of available bridge routes matching the specified source chain, destination chain, token, and amount — including protocol names, estimated output amounts, fees, and expected transfer durations.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-defi-bridge-routes-9fa06883/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-defi.vercel.app](https://www.zero.xyz/host/bb-defi.vercel.app/llms.txt)