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Synapse API — Polygon RPC Endpoint
x402
Synapse API — Polygon RPC Endpoint 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 2026-10-29).
Proxies JSON-RPC calls to the Polygon blockchain network, enabling agents to read chain state, submit transactions, and interact with smart contracts on Polygon.
Price / call$0.01
Success—
StatusUnknown
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 a standard JSON-RPC response object containing an 'id', 'jsonrpc' version field, and a 'result' field with the blockchain data (e.g. block number as hex, balance in wei, transaction receipt object, or contract call return data). On error, returns a JSON-RPC error object with code and message.
Example use cases
DeFi portfolio balance check
“Look up the ETH/ERC-20 token balance for my wallet 0x1234abcd... on Polygon mainnet — use eth_getBalance to fetch the current MATIC balance.”
Smart contract state query
“Call the Polygon RPC with eth_call to read the totalSupply from the USDC contract at 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174.”
Latest block number retrieval
“What's the latest block number on Polygon right now? Run an eth_blockNumber RPC call and tell me the result.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/polygon/rpc?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need pay-per-call, no-subscription access to Polygon blockchain RPC without managing your own node or committing to a monthly RPC plan. Ideal for agents that occasionally need Polygon chain data and want to pay $0.01 USDC per call via x402 micropayments rather than provisioning an Alchemy, Infura, or QuickNode account.
Side effects
- Invalid RPC method name returns JSON-RPC error code -32601 (method not found)
- Malformed params array returns error code -32602 (invalid params)
- Network congestion or upstream node unavailability causes timeout or 503
- Payment failure (insufficient USDC) results in 402 Payment Required before the call is proxied
- Calling write methods without a signed transaction will fail with execution error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| method | string | |
| params | array |
Tags
x402
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