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sentientsprite
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agentic-gateway

Access Alchemy Node, NFT, Portfolio, and Prices APIs via SIWE and x402.

Updated Feb 12, 2026
Search Tags:#authentication#blockchain#alchemy#payment gateway#x402#siwe#api access
One-click install
npx skills add https://github.com/sentientsprite/nemo-agent --skill agentic-gateway-sentientsprite
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: agentic-gateway
Source: https://github.com/sentientsprite/nemo-agent/tree/main/.agents/skills/agentic-gateway
Command: npx skills add https://github.com/sentientsprite/nemo-agent --skill agentic-gateway-sentientsprite

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill allows agents to access Alchemy's powerful blockchain development platform without needing to manage API keys directly, simplifying integration and abstracting away complex authentication and payment flows.

Core Features & Use Cases

  • Keyless Alchemy Access: Connect to Alchemy's Node, NFT, Portfolio, and Prices APIs without an ALCHEMY_API_KEY.
  • Secure Authentication & Payment: Handles SIWE (Sign-In With Ethereum) authentication and x402 protocol for per-request USDC payments automatically.
  • Use Case: An agent needs to fetch NFT ownership data for a user's wallet. Instead of requiring the user to provide an Alchemy API key, the agent uses this Skill to authenticate via the user's Ethereum wallet and pay for the API call using USDC, providing a seamless experience.

Quick Start

Use the agentic-gateway skill to get the latest block number on Ethereum mainnet.

Frequently Asked Questions about agentic-gateway

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I access Alchemy APIs without an API key?▼

You can access Alchemy APIs without an API key by using SIWE authentication and x402 payment flows. This gateway abstracts key management by authenticating agents via an Ethereum wallet and handling per-request USDC payments automatically.

How does SIWE authentication work for blockchain API requests?▼

SIWE authentication for blockchain API requests works by using Sign-In With Ethereum to verify wallet ownership. This gateway manages the SIWE flow automatically, allowing agents to securely access Alchemy's Node, NFT, Portfolio, and Prices APIs without explicit credentials.

Can I fetch NFT ownership data using USDC payments instead of an Alchemy API key?▼

Yes, you can fetch NFT ownership data using USDC payments instead of an Alchemy API key. The gateway utilizes the x402 protocol to handle per-request USDC transactions, abstracting away the need for explicit API keys and managing transactional costs.

Does this gateway support Alchemy Node JSON-RPC, NFT, Portfolio, and Prices APIs?▼

Yes, this gateway supports Alchemy Node JSON-RPC, NFT, Portfolio, and Prices APIs. It provides a unified interface to interact with these developer platform APIs while managing the underlying SIWE authentication and x402 payment processes.

What is the x402 protocol for per-request API payments?▼

The x402 protocol for per-request API payments is a mechanism used to handle transactional costs automatically. This gateway implements x402 to facilitate seamless USDC payments for individual Alchemy API calls without requiring prepaid balances or manual API key provisioning.

How do I get the latest block number on Ethereum mainnet without managing API keys?▼

To get the latest block number on Ethereum mainnet without managing API keys, you use this gateway to connect to Alchemy's Node JSON-RPC. It handles the SIWE authentication and x402 USDC payment required for the request automatically.

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