services: add Surf - pay-per-use research API for AI agents

[tenequm]

Service: Surf

URL: https://surf.cascade.fyi
Integration: First-party (native MPP, not proxied)
Payment: Tempo USDC
Intent: Charge (data endpoints) + Session (inference streaming)

What it does

Unified pay-per-use API for AI agents. Twitter, Reddit, web data, and LLM inference - no signup, no API keys. 10 composite REST endpoints + MCP server with 9 tools.

Endpoints

Route	Description	Pricing
POST /api/v1/twitter/search	Search tweets with advanced operators	$0.005
POST /api/v1/twitter/tweet	Fetch tweet with full thread context	$0.005
POST /api/v1/twitter/user	Fetch user profile with recent tweets	$0.005
POST /api/v1/reddit/search	Search Reddit posts	$0.005
POST /api/v1/reddit/post	Fetch post with comments	$0.005
POST /api/v1/reddit/subreddit	Subreddit info and top posts	$0.005
POST /api/v1/reddit/user	User profile with recent activity	$0.005
POST /api/v1/web/search	AI-powered web search	$0.01
POST /api/v1/web/crawl	Crawl URL to markdown or HTML	$0.002
POST /api/v1/inference/completions	Chat completions (15 models)	Dynamic
GET /api/v1/inference/models	List available models	Free

Why it's novel

• Bundled data + compute: Four domains (Twitter, Reddit, Web, Inference) under one API, one wallet. No competitor bundles multiple data sources with inference under a single payment model.
• Composite enriched data: Each call returns what would normally require multiple API requests - thread context, engagement metrics, topic extraction, auto-crawled article content.
• MCP server: Unified MCP at /mcp with tool filtering via ?tools= query param for direct AI agent tool calls.
• Dual-protocol: Same endpoints handle both x402 (Solana/Base USDC) and MPP (Tempo USDC).
• First-party: MPP built into the service, not proxied through mpp.tempo.xyz.

Checklist

• Service is live and accepting MPP payments
• schemas/services.ts updated
• pnpm check:types passes

Verify it's live

# 402 challenge on a data endpoint
curl -s https://surf.cascade.fyi/api/v1/twitter/user \
  -X POST -H "Content-Type: application/json" \
  -d '{"ref":"cascade_fyi"}' \
  -o /dev/null -w "%{http_code}"
# Returns: 402

# Free endpoint
curl -s https://surf.cascade.fyi/api/v1/inference/models | head -c 200

# OpenAPI spec
curl -s https://surf.cascade.fyi/openapi.json | head -c 200

[vercel]

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