# Synapse API — Sei NFT Metadata Lookup

> Synapse API — Sei NFT Metadata Lookup 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).

Fetches NFT metadata for a given token ID and contract address on the Sei blockchain network.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/sei/nft/metadata
- 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-sei-nft-metadata-lookup-1ddd1788
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5B95RER_PDAVrJ94i5uII

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-sei-nft-metadata-lookup-1ddd1788 -d '<json body>'
```

Example prompt: Can you pull up the metadata for the NFT with token ID 42 from contract address 0xABC123 on the Sei blockchain?

## When to prefer this

Use this endpoint when you specifically need NFT metadata from the Sei blockchain and want a simple pay-per-call model without managing your own Sei RPC node. Prefer this over generic blockchain RPC calls when you want a normalized metadata response without raw on-chain decoding.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty response
- Token ID not found within the contract returns a not-found error
- Sei network connectivity issues cause timeouts
- Malformed input (non-string token ID or address) causes validation errors
- Payment failure via x402 blocks the request entirely

## 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 NFT metadata for the specified token on the Sei blockchain, typically including the token name, description, image URL, and a list of attributes/traits associated with that NFT.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-sei-nft-metadata-lookup-1ddd1788/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)