# Synapse API — Kaia NFT Metadata Lookup

> Synapse API — Kaia 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 2026-09-13).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/kaia/nft/metadata
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-kaia-nft-metadata-lookup-6e645189
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W6NMGosQ2G67qxGFohph8

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-kaia-nft-metadata-lookup-6e645189 -d '<json body>'
```

Example prompt: Can you look up the metadata for token ID 42 from the Kaia NFT contract at address 0x1234abcd5678ef90 — I want to see its name, image, and traits?

## When to prefer this

Use this endpoint when you specifically need NFT metadata from the Kaia blockchain (formerly Klaytn) and want a pay-per-call, low-overhead solution without managing your own RPC infrastructure. Prefer this over generic NFT APIs when working within the Kaia ecosystem.

## Known failure modes

- Invalid or non-existent contract address returns an error or empty response
- Token ID not found on the specified contract returns null or 404-equivalent
- Kaia network RPC unavailability causes timeouts
- Malformed contract address format causes request rejection
- Token ID out of range or not yet minted returns an error

## 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 Kaia blockchain, typically including the token name, description, image URL, external URL, and an array of trait attributes (trait_type and value pairs).

## 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-kaia-nft-metadata-lookup-6e645189/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)