Powering Payments Across
the Open Internet
Monetize APIs, run campaigns, accept payments & go keyless - all powered by x402.
No subscriptions, no middlemen. Multi-network support included — users can pay from the chain they already use.
New to this standard? Learn the x402 protocol.
How a paid request works
[1] POST /api/your-endpoint
→ Client sends a request
x402 intercept
[2] VERIFY payment signature
→ Validate micro‑payment (e.g., $0.01)
✓ Confirmed in ~200ms
x402 execute
[3] RETURN { data: ... }
→ Response sent to the client
→ Revenue credited to your wallet
Total overhead: ~300msFrom $0.01 per callWhy Choose RelAI?
Built for developers, by developers. The future of API monetization.
Core Features
Micropayments
Charge from $0.01 per API call with instant settlements
Instant Settlement
Payments settle in under 2 seconds on Solana blockchain
Multi-Chain Support
Solana, Base, SKALE Base, Ethereum, Polygon, and more networks supported
x402 Protocol
Industry-standard HTTP 402 with v1/v2 compatibility
Advanced Capabilities
MCP Integration
Native Model Context Protocol support for AI agents
Multiple Facilitators
PayAI, Dexter, RelAI, AutoIncentive, 0xGasless, and custom facilitator support
Payment Links
Share a paywall link so users can pay and call your API without extra integration
Pricing Models
Static & dynamic pricing: per-call, per-token, multiply fields, and client-quoted flows
OpenAPI Support
Upload your API spec and auto-generate paywalled endpoints
Custom Domains
Dedicated custom domain for every API with white-label branding
Custom Paywall
Fully customizable x402 paywall with your branding and design
Built-in Wallets
Custodial Solana & EVM wallets for seamless marketplace payments - no browser extension needed
Teams & Collaboration
Create teams, invite members, and manage APIs together with role-based access control
How It Works
Get started in minutes, not months
Upload Your API
Upload your OpenAPI spec or define endpoints manually with custom pricing
Configure & Test
Set pricing models, custom domains, paywall branding, and enable MCP or direct API access
Publish & Earn
Publish to marketplace, enable paywall, and receive instant payments
Register Your API & Earn Per Request
Turn your API into a revenue stream with x402 micropayments. Set your price per call and get paid instantly for every request.
- Upload OpenAPI spec or define endpoints manually
- Flexible pricing: per-call, per-token, or dynamic
- Proxy mode or integrate x402 directly
- MCP support for AI agents integration
Monetize Any URL with Payment Links
Create shareable payment links that paywall any URL. Perfect for content, downloads, webhooks, or any resource you want to monetize.
- No coding required - just paste your URL and set a price
- Customizable paywall with your branding
- Configurable access duration after payment
- Works with all supported networks and facilitators
Organize Links into Campaigns
Group multiple payment links together with shared settings. Perfect for promotions, product bundles, or time-limited offers.
- One network & facilitator for all links in campaign
- Schedule campaigns with start and end dates
- Aggregated stats and revenue tracking
- Bulk management of multiple payment links
Pay for x402 APIs with a Simple API Key
No wallets, no signing, no crypto in your code. Just an API key and a funded account. RelAI handles all payment signing and settlement automatically.
- Dedicated custodial wallets (Solana + EVM) per API key
- Works with any x402-compliant API — Base, SKALE, Avalanche, Solana
- Usage tracking, spending limits, and full payment history
- One line of code — works with any HTTP client
// Before: wallet setup, signing, gas...
const wallet = new Wallet(key);
const permit = await signPermit(...);
const proof = encodePayment(permit);
// After: one line with Metered API Access
const res = await fetch(
`https://api.relai.fi/metered/x
?url=${targetUrl}`,
{ headers: { "X-API-Key": key } }
);
// ✓ Payment handled automatically
// ✓ Works with any x402 APIBuilt with Leading Technologies
Powered by trusted partners in the x402 ecosystem
Supported Networks
Deploy your APIs across multiple blockchain networks
Solana
Ultra-fast settlements with sub-second finality and minimal fees
Base
Coinbase L2 with EVM compatibility and low transaction costs
SKALE Base
Zero gas fees with RelAI facilitator - we pay for all transactions
Avalanche
Gas-sponsored payments with RelAI facilitator on Avalanche C-Chain
Ethereum
Mainnet support with RelAI facilitator and sponsored gas
Polygon
Low-cost EVM transactions with fast block times
Sei
High-performance blockchain optimized for trading applications
peaq
DePIN-focused blockchain for IoT and machine economy
Tokenomics
Deflationary tokenomics with auto buybacks, burns, and real utility
5AgHPy5UojpGq6TdtQCNobCZ2tkYmZz4d5p1cqr6pumpLatest from the blog
One API, Every Chain - RelAI Now Supports Multi-Network Payments
RelAI now supports multi-network x402 payments. One API endpoint, multiple chains - users pay from whichever network they already have funds on.
RelAI Integration with OnFinality: AI Agent Coordination for Web3 Infrastructure
OnFinality integrates RelAI to offer Ethereum RPC via x402 with on-chain, pay-per-request settlement — no signup, no API keys, no monthly plans.
WebSocket in x402 Relay: What Problems We Solve by Introducing WS
Why we introduced WebSocket transport in x402 Relay, which bottlenecks it removes, and how HTTP fallback keeps paid API calls reliable.