Gas Comparison API

Description

**THE VIRAL LOOP:**
```
Developer needs gas data
→ Uses free API
→ API shows NEAR is cheapest
→ Developer's product shows NEAR
```

**Deliverables:**
```
GET /api/gas/compare
Response: {
"near": { "cost_usd": 0.001, "speed": "2s" },
"ethereum": { "cost_usd": 5.23, "speed": "15s" },
...
}
```

**PUBLISHED TO:** API directories, developer docs

**Success Metrics:** 1000+ API calls/day