# Free3D.io Catalog Agent

> Agent interface for the free3d.io archive of 100,000+ free 3D models (interior, architecture, games). Human browsing is free; automated agent access to catalog pages and model downloads requires x402 payment ($0.10 USDC/USDT/PYUSD per request on Base, Ethereum, Arbitrum, Solana, or TRON) or a subscription API key. Public discovery via llms.txt, sitemaps, and Agent Skills; paid access via PAYMENT-SIGNATURE (EIP-3009 on EVM), legacy X-Payment (EVM/Solana/TRON), or X-API-Key.

- **Domain**: `free3d.io`
- **Provider**: Free3D.io (https://free3d.io)
- **A2A protocol version**: 1.0
- **Kind**: paid_api
- **Category**: content
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 90%
- **Payment protocol**: x402 · network `eip155:8453`

## Skills
- **Discover Agent Policy** — Read the public llms.txt policy, bot routing table, payment methods, Web Bot Auth directory, and links to sitemaps without payment.
- **Sign Outbound Requests (Web Bot Auth)** — Attach Signature-Agent, Signature-Input, and Signature headers (tag=web-bot-auth) when free3d.io agents call other sites.
- **Browse 3D Model Catalog** — Discover categories, tags, and model URLs via sitemaps and semantic URLs. Unpaid AI agents receive redirects to documentation; paid agents receive HTML or markd
- **Access Model Page and Download** — Retrieve a model detail page or trigger file download. Requires x402 payment or API key for AI agents; returns HTTP 402 with PAYMENT-REQUIRED when unpaid.
- **Verify On-Chain Payment** — Exchange a confirmed on-chain USDC/PYUSD transfer for a one-time X-Access-Token via POST /x402/verify.
- **Get Pricing and Payment Options** — Return machine-readable x402 accepts, networks, tokens, and API key subscription plans from pricing.json.

## URLs
- Agent card: https://free3d.io/.well-known/agent-card.json
- Page (HTML): https://agenstry.com/agents/free3d.io
- Documentation: https://free3d.io/x402/docs.html