PayAI Facilitator: one integration, five blockchains

When we set out to build RelAI, we knew that no single blockchain would rule the internet. Developers and businesses need the freedom to choose the network that fits their use case - whether that's Solana for speed, Base for Ethereum compatibility, or Peaq for IoT payments.

That's why we integrated PayAI as our primary multi-chain facilitator. With one integration, your API accepts payments on five different blockchains.

What is a facilitator?

In the x402 protocol, a facilitator is the service that processes payments between users and API providers. When someone uses your paid service:

The user's wallet signs a payment authorization
The facilitator verifies the signature is valid
The facilitator settles the payment on-chain
Your API delivers the response

The facilitator handles all the blockchain complexity - gas fees, transaction submission, confirmation - so neither you nor your users have to think about it.

Why PayAI stands out

PayAI supports more chains than any other facilitator in the x402 ecosystem:

Network	Type	What it's good for
Solana	SVM	Ultra-fast transactions, large crypto-native audience
Base	EVM (L2)	Ethereum ecosystem, Coinbase users, low fees
Peaq	EVM	IoT and machine-to-machine payments
Polygon	EVM	High throughput, established DeFi ecosystem
Sei	EVM	Trading-optimized, fast finality

That's both Solana (SVM) and EVM chains covered in a single facilitator - something no other x402 facilitator offers today.

Both protocol versions supported

PayAI supports x402 v1 and v2 on Solana and Base, giving you flexibility:

v1 - battle-tested, widely compatible, works everywhere
v2 - newer, more efficient header-based flow, better for high-throughput APIs

On Peaq, Polygon, and Sei, v1 is supported with v2 coming soon.

Zero gas fees for your users

PayAI covers all transaction fees. When a user pays for your API:

On Solana - PayAI acts as the fee payer, sponsoring the transaction
On EVM chains - PayAI submits the transaction and pays the gas

Your users only pay the price you set. The blockchain overhead? That's handled.

How to use PayAI on RelAI

When you register your API on the RelAI dashboard, simply select PayAI as your facilitator and pick your preferred network. That's it.

If you're using the SDK directly:

Set facilitator: 'payai' in your API configuration
Choose your network (solana, base, peaq, polygon, or sei)
Deploy - PayAI handles the rest

You can even change networks later without modifying your API code. The facilitator adapts automatically.

Real-world example

Imagine you run a weather data API. With PayAI:

A Solana user in the US pays $0.001 per request - settled in ~400ms
A Base user in Europe pays the same - settled in ~2 seconds
A Peaq IoT device in a factory pays automatically - no human interaction needed

Same API, same price, three different blockchains. One facilitator.

Getting started

Go to the RelAI Dashboard
Register your API
Select PayAI as your facilitator
Pick your network
Start earning

It takes less than 5 minutes to set up.

Five chains. One facilitator. Zero complexity. That's PayAI on RelAI.