# x402dir.com — The x402 Facilitator Directory

x402dir.com is a public directory and comparison tool for x402 payment protocol facilitators. The x402 protocol (HTTP 402 Payment Required) enables AI agents and applications to make autonomous payments on the blockchain.

## Pages

### / (Homepage)
Overview of x402dir.com with links to the three main tools: Compare, Calculator, and Recommend.

### /compare
Side-by-side comparison table of all x402 facilitators. Filterable by chain and fee structure. Sortable by name and fee. Includes facilitator name, fee structure, supported chains, and description. Available in table and grid views.

### /calculator
Cost comparison calculator. Enter your expected monthly transaction count and average transaction amount to see estimated monthly costs for every facilitator. Displays a horizontal bar chart sorted from cheapest to most expensive.

### /recommend
Facilitator recommendation tool. Select your blockchain (Base, Solana, Polygon, etc.), token (USDC, EURC), and monthly volume tier to get a personalized facilitator recommendation with cost comparison.

## Paid API (x402)

### GET /api/recommend
Machine-readable facilitator recommendation. Same ranking logic as /recommend. Protected by x402 HTTP 402; charge is $0.001 USDC per successful query on Base (eip155:8453) via the CDP facilitator.

Query parameters:
- chain (required): Base | Solana | Polygon | Avalanche | Stellar | BNB Chain | Multiple EVM | Omnichain
- token (required): USDC | EURC
- volume (required): monthly transaction count (number), e.g. 500, 5000, 50000, 150000
- avgAmount (optional): average payment size in USD (default 5)

Example (unpaid probe returns HTTP 402 with payment requirements):
https://x402dir.com/api/recommend?chain=Base&token=USDC&volume=5000

Paid clients retry with a valid PAYMENT-SIGNATURE header after settling USDC.

Response (200 after payment): JSON with best, runnerUp, matches[], matchCount, query, price.

## Data

The directory currently tracks 20 x402 facilitators including Coinbase CDP, PayAI, Thirdweb, Cloudflare, and others. Data includes fee structures, supported blockchain networks, and descriptions.

## Contact

This site is maintained by BetrNames. For inquiries: contact@gabemariscal.com