# Synapse API — Base NFT Floor Price

> Synapse API — Base NFT Floor Price 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).

Returns the current floor price for an NFT collection on the Base blockchain given a contract address

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/base/nft/floor-price
- 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-base-nft-floor-price-f83a7ecb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AyqEcB_KpULbMs1vd5vgb

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-base-nft-floor-price-f83a7ecb -d '<json body>'
```

Example prompt: What's the current floor price for the NFT collection at contract address 0x1234...abcd on Base?

## When to prefer this

Use this endpoint when you specifically need floor price data for an NFT collection deployed on the Base blockchain and want a pay-per-call model with no subscription. Prefer this over general NFT APIs when cost efficiency per call matters and you are working in the Base ecosystem.

## Known failure modes

- Invalid or non-existent contract address returns an error
- Contract address is on a different chain than Base, resulting in no data
- NFT collection has no active listings, so floor price may be zero or unavailable
- Rate limiting or payment failure via x402 protocol
- Network latency or third-party data source outage causing timeout

## 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 the floor price of the specified NFT collection on the Base blockchain, expressed as a numeric value (likely in ETH or USDC), representing the lowest listed price for any NFT in that collection at the time of the query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "contractAddress": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-base-nft-floor-price-f83a7ecb/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)