X402 Multi Chain Blockchain Gateway

What is X402 Multi Chain Blockchain Gateway?

A pay-per-call blockchain data API that provides REST endpoints for NEAR Protocol, Solana, and Base (Ethereum L2). It uses the x402 protocol for per-request USDC micropayments ($0.001–$0.005 per call) on Solana or Base. No API keys or signup required—just attach an X-PAYMENT header with a USDC transaction proof.

How to use X402 Multi Chain Blockchain Gateway?

Make HTTP GET requests to any of the 24 endpoints, including an X-PAYMENT header containing a USDC transaction proof from Solana mainnet (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp) or Base (eip155:8453). The gateway is agent-discoverable via OpenAPI 3.1, A2A agent card, ChatGPT plugin manifest, and llms.txt. For self-hosting, clone the repository, install dependencies, set X402_PAY_TO and X402_BASE_PAY_TO environment variables, then start the server.

Key features of X402 Multi Chain Blockchain Gateway

• 24 REST endpoints across NEAR, Solana, and Base
• Micropayments via x402 protocol ($0.001–$0.005 USDC per call)
• No API keys, no signup required
• Agent-discoverable: OpenAPI 3.1, A2A card, ChatGPT plugin, llms.txt
• Built-in analytics dashboard with payment tracking
• Can self‑host with free/demo mode (no payment required)

Use cases of X402 Multi Chain Blockchain Gateway

• AI agents querying on-chain data on demand with microtransactions
• Developers building cross-chain dashboards without managing RPC keys
• Automated analytics pipelines fetching balances, validators, and token data
• Wallet applications tracking account activity across NEAR, Solana, and Base

FAQ from X402 Multi Chain Blockchain Gateway

What blockchains does it support?

NEAR Protocol, Solana, and Base (Ethereum L2).

How do I pay for each call?

Include an X-PAYMENT header with a valid USDC transaction proof from either Solana mainnet or Base. The fees range from $0.001 to $0.005 per endpoint.

Can I run my own instance?

Yes. Clone the repository, set the X402_PAY_TO and X402_BASE_PAY_TO environment variables for paid mode, or leave them unset for free/demo mode.

What is required to self-host?

Node.js, npm, and environment variables for paid mode. The tech stack uses TypeScript, Express, @x402/express middleware, near-api-js, and better-sqlite3.

Are there any API keys or signup needed?

No. The public gateway at ironflip.duckdns.org requires no signup—just attach the X-PAYMENT header with a payment proof.