# Synapse API — Polygon Token Metadata Lookup

> Synapse API — Polygon Token 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 on-chain metadata for a given ERC-20 or NFT token contract on the Polygon network, returning details such as name, symbol, decimals, and supply.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/polygon/token/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-polygon-token-metadata-lookup-26754e5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RCxEX3t0K_iaGtYUGOgF-

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-polygon-token-metadata-lookup-26754e5d -d '<json body>'
```

Example prompt: Can you look up the token metadata for the Polygon contract at 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174 — I need the name, symbol, and decimals.

## When to prefer this

Choose this endpoint when you need to resolve token metadata specifically on the Polygon (MATIC) network by contract address. It is ideal for enriching DeFi dashboards, validating token identities before transactions, or building token registries on Polygon. Prefer this over generic blockchain explorers when you need a pay-per-call, agent-friendly API with structured JSON output on the Polygon chain specifically.

## Known failure modes

- Invalid or malformed contract address returns a validation error
- Contract address exists on a different chain (not Polygon) returns not found or empty metadata
- Unverified or proxy contracts may return incomplete metadata
- Network congestion or RPC timeout may cause delayed or failed responses
- Non-token contracts (plain wallets or non-standard contracts) may return null fields

## 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 structured on-chain metadata for the specified Polygon token contract, including the token's name, symbol, number of decimals, total supply, and potentially token standard (ERC-20, ERC-721, etc.).

## 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-polygon-token-metadata-lookup-26754e5d/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)