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Synapse API — Sei Network RPC Proxy
x402
Synapse API — Sei Network RPC Proxy 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 2026-09-14).
Proxies JSON-RPC method calls to the Sei blockchain network, enabling reads and writes against Sei chain state via a pay-per-call model.
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 the result field with the on-chain data (e.g. balance, block, receipt, or contract return value), or an error object with code and message if the call fails.
Example use cases
Check wallet balance on Sei
“What's the current on-chain SEI balance for wallet address 0x4f3edf983ac636a65a842ce7c78d9aa706d3b113? Use the Sei RPC to call eth_getBalance.”
Fetch latest Sei block info
“Get me the latest block on the Sei network — call eth_getBlockByNumber with 'latest' so I can see the block hash and timestamp.”
Submit signed transaction to Sei
“Broadcast this signed raw transaction to the Sei network using eth_sendRawTransaction: 0xf86c0985012a05f200...”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/sei/rpcWhen to prefer
Use this endpoint when you need direct, pay-per-call access to the Sei blockchain RPC without managing your own node or committing to a subscription. Ideal for agents that need occasional or low-volume Sei chain queries, or for applications that want to avoid node infrastructure overhead while supporting Sei specifically.
Side effects
- Invalid JSON-RPC method name returns error code -32601 Method not found
- Malformed params array causes parse error -32700
- Network congestion or Sei node unavailability returns 503 or timeout
- Payment failure (x402) if USDC balance is insufficient
- Invalid transaction data in eth_sendRawTransaction returns revert or invalid input error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| method | string | |
| params | array |
Tags
x402
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