Add geo-gateway: pay-per-call Mapbox geospatial proxy

[sun-jay-ea]

What

Adds geo-gateway to the API Examples section — a pay-per-call Mapbox geospatial proxy for AI agents.

Endpoints

Endpoint	What it proxies	Price (USDC)
POST /directions	Mapbox Directions (walking/cycling/driving)	$0.003
POST /isochrone	Mapbox Isochrone (reachable area polygons)	$0.003
POST /match	Mapbox Map Matching (snap GPS traces)	$0.003
POST /optimize	Mapbox Optimization (multi-stop TSP)	$0.003
POST /geocode	Mapbox Geocoding (forward + reverse)	$0.002
POST /matrix	Mapbox Matrix (distance/time, max 5 coords)	$0.0635

Why it matters

The x402 ecosystem has ~17k services but virtually zero geospatial primitives. Agents doing walkability analysis, logistics optimization, or location intelligence currently can't get isochrones, map matching, or distance matrices without signing up for Mapbox/Google with monthly contracts. geo-gateway fills that gap with per-call pricing.

Technical details

• x402 v2, USDC on Base mainnet
• Coinbase CDP facilitator with authenticated JWTs
• Pre-payment validation (bad requests return 400, never charged)
• OpenAPI discovery at /openapi.json
• AWS Lambda + API Gateway
• Source code