Add MCP server for LLM agent integration

5 tools (capture_screenshot, markdown_to_pdf, markdown_to_image,
markdown_to_html, api_status) + API docs resource. Stdio transport
for Claude Code/Desktop integration. Updated README with MCP setup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -1,11 +1,132 @@
-# SnapAPI v2.0
+# SnapAPI v3.1
 
-Screenshot, PDF, and Markdown conversion API powered by Puppeteer + Chrome.
+Screenshot, PDF, and Markdown conversion API with x402 micropayments and MCP support.
 
 ## Features
 - URL screenshot capture (PNG, JPEG)
 - PDF generation from URLs
 - Markdown to PDF/PNG/HTML conversion
-- API key authentication
+- **x402 micropayments** - pay-per-request with USDC on Base (no signup needed)
+- **Bazaar discovery** - machine-readable API schemas for AI agent auto-discovery
+- **MCP server** - Model Context Protocol integration for LLM agents
+- API key authentication (traditional)
 - Rate limiting and concurrency control
 - SSRF protection
+
+## x402 Micropayments
+
+Pay per request with USDC on Base network. No signup, no API keys needed.
+
+```bash
+# Without payment, you get a 402 response with payment requirements:
+curl https://api.opspawn.com/screenshot-api/api/capture?url=https://example.com
+# Returns: HTTP 402 with Payment-Required header
+
+# With x402 payment signature:
+curl -H "Payment-Signature: <signed-authorization>" \
+  "https://api.opspawn.com/screenshot-api/api/capture?url=https://example.com"
+```
+
+**Pricing:**
+- Screenshot capture: $0.01/request
+- Markdown to PDF: $0.005/request
+- Markdown to PNG: $0.005/request
+
+## MCP Server
+
+Use SnapAPI as an MCP tool server for Claude Code, Claude Desktop, or any MCP-compatible LLM agent.
+
+### Setup
+
+```bash
+# Install dependencies
+npm install
+
+# Run MCP server (stdio transport)
+node mcp-server.mjs
+
+# With custom API URL and key
+SNAPAPI_URL=http://localhost:3001 SNAPAPI_API_KEY=your_key node mcp-server.mjs
+```
+
+### Claude Desktop Configuration
+
+Add to `claude_desktop_config.json`:
+
+```json
+{
+  "mcpServers": {
+    "snapapi": {
+      "command": "node",
+      "args": ["/path/to/screenshot-api/mcp-server.mjs"],
+      "env": {
+        "SNAPAPI_URL": "http://localhost:3001",
+        "SNAPAPI_API_KEY": "your_api_key"
+      }
+    }
+  }
+}
+```
+
+### Available Tools
+
+| Tool | Description |
+|------|-------------|
+| `capture_screenshot` | Capture screenshot/PDF of a web page |
+| `markdown_to_pdf` | Convert Markdown to styled PDF |
+| `markdown_to_image` | Convert Markdown to PNG/JPEG image |
+| `markdown_to_html` | Convert Markdown to styled HTML (free) |
+| `api_status` | Check service health and stats |
+
+### Available Resources
+
+| Resource | URI | Description |
+|----------|-----|-------------|
+| API Docs | `snapapi://docs` | Full API documentation |
+
+## Traditional API
+
+### Endpoints
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| GET | `/api/capture` | Required | Capture screenshot/PDF from URL |
+| POST | `/api/md2pdf` | Required | Markdown to PDF |
+| POST | `/api/md2png` | Required | Markdown to PNG/JPEG |
+| POST | `/api/md2html` | Free | Markdown to HTML |
+| GET | `/api/status` | Free | Service health |
+| GET | `/api/pricing` | Free | Subscription plans |
+
+### Quick Start
+
+```bash
+# Screenshot
+curl "http://localhost:3001/api/capture?url=https://example.com&api_key=YOUR_KEY"
+
+# Markdown to PDF
+curl -X POST http://localhost:3001/api/md2pdf \
+  -H "X-API-Key: YOUR_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{"markdown": "# Hello\nWorld"}'
+
+# Markdown to HTML (free)
+curl -X POST http://localhost:3001/api/md2html \
+  -H "Content-Type: application/json" \
+  -d '{"markdown": "# Hello\nWorld"}'
+```
+
+## Running
+
+```bash
+npm install
+npm start          # Start API server on port 3001
+node mcp-server.mjs  # Start MCP server (stdio)
+```
+
+## Built By
+
+[OpSpawn](https://opspawn.com) - an autonomous AI agent building agent infrastructure.
+
+## License
+
+MIT

mcp-server.mjs

@@ -0,0 +1,318 @@
+#!/usr/bin/env node
+
+/**
+ * OpSpawn Screenshot API - MCP Server
+ *
+ * Exposes screenshot capture and markdown conversion as MCP tools
+ * that LLM agents can use via the Model Context Protocol.
+ *
+ * Usage:
+ *   node mcp-server.mjs                    # stdio transport (for Claude Code, etc.)
+ *   SNAPAPI_URL=http://localhost:3001 node mcp-server.mjs  # custom API URL
+ *
+ * Add to claude_desktop_config.json:
+ *   {
+ *     "mcpServers": {
+ *       "snapapi": {
+ *         "command": "node",
+ *         "args": ["/path/to/mcp-server.mjs"]
+ *       }
+ *     }
+ *   }
+ */
+
+import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
+import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
+import { z } from 'zod';
+
+const API_URL = process.env.SNAPAPI_URL || 'http://localhost:3001';
+const API_KEY = process.env.SNAPAPI_API_KEY || '';
+
+async function apiRequest(path, options = {}) {
+  const url = new URL(path, API_URL);
+
+  if (options.params) {
+    for (const [k, v] of Object.entries(options.params)) {
+      if (v !== undefined && v !== null && v !== '') {
+        url.searchParams.set(k, String(v));
+      }
+    }
+  }
+
+  const headers = {};
+  if (API_KEY) headers['X-API-Key'] = API_KEY;
+  if (options.body) headers['Content-Type'] = 'application/json';
+
+  const resp = await fetch(url.toString(), {
+    method: options.method || 'GET',
+    headers,
+    body: options.body ? JSON.stringify(options.body) : undefined,
+  });
+
+  return resp;
+}
+
+const server = new McpServer({
+  name: 'snapapi',
+  version: '1.0.0',
+});
+
+// Tool 1: Capture screenshot from URL
+server.tool(
+  'capture_screenshot',
+  'Capture a screenshot or PDF of a web page. Returns the image as base64-encoded data.',
+  {
+    url: z.string().url().describe('The URL to capture'),
+    format: z.enum(['png', 'jpeg', 'pdf']).default('png').describe('Output format'),
+    width: z.number().int().min(320).max(3840).default(1280).optional()
+      .describe('Viewport width in pixels'),
+    height: z.number().int().min(200).max(2160).default(800).optional()
+      .describe('Viewport height in pixels'),
+    fullPage: z.boolean().default(false).optional()
+      .describe('Capture full scrollable page instead of just viewport'),
+    delay: z.number().int().min(0).max(10000).default(0).optional()
+      .describe('Milliseconds to wait after page load before capture'),
+  },
+  async ({ url, format, width, height, fullPage, delay }) => {
+    try {
+      const resp = await apiRequest('/api/capture', {
+        params: { url, format, width, height, fullPage, delay },
+      });
+
+      if (!resp.ok) {
+        const err = await resp.json().catch(() => ({ error: resp.statusText }));
+        return {
+          content: [{ type: 'text', text: `Error ${resp.status}: ${err.error || resp.statusText}` }],
+          isError: true,
+        };
+      }
+
+      const buffer = Buffer.from(await resp.arrayBuffer());
+      const mimeType = format === 'pdf' ? 'application/pdf'
+        : format === 'jpeg' ? 'image/jpeg' : 'image/png';
+
+      if (format === 'pdf') {
+        return {
+          content: [{
+            type: 'resource',
+            resource: {
+              uri: `data:${mimeType};base64,${buffer.toString('base64')}`,
+              mimeType,
+              text: buffer.toString('base64'),
+            },
+          }],
+        };
+      }
+
+      return {
+        content: [{
+          type: 'image',
+          data: buffer.toString('base64'),
+          mimeType,
+        }],
+      };
+    } catch (err) {
+      return {
+        content: [{ type: 'text', text: `Failed to capture screenshot: ${err.message}` }],
+        isError: true,
+      };
+    }
+  }
+);
+
+// Tool 2: Convert Markdown to PDF
+server.tool(
+  'markdown_to_pdf',
+  'Convert Markdown text to a styled PDF document. Returns base64-encoded PDF.',
+  {
+    markdown: z.string().describe('Markdown content to convert'),
+    theme: z.enum(['light', 'dark']).default('light').optional()
+      .describe('Visual theme for the PDF'),
+    paperSize: z.enum(['A4', 'Letter', 'Legal', 'Tabloid']).default('A4').optional()
+      .describe('Paper size'),
+    landscape: z.boolean().default(false).optional()
+      .describe('Use landscape orientation'),
+    fontSize: z.string().default('16px').optional()
+      .describe('Base font size (e.g. "14px", "18px")'),
+  },
+  async ({ markdown, theme, paperSize, landscape, fontSize }) => {
+    try {
+      const resp = await apiRequest('/api/md2pdf', {
+        method: 'POST',
+        body: { markdown, theme, paperSize, landscape, fontSize },
+      });
+
+      if (!resp.ok) {
+        const err = await resp.json().catch(() => ({ error: resp.statusText }));
+        return {
+          content: [{ type: 'text', text: `Error ${resp.status}: ${err.error || resp.statusText}` }],
+          isError: true,
+        };
+      }
+
+      const buffer = Buffer.from(await resp.arrayBuffer());
+      return {
+        content: [{
+          type: 'resource',
+          resource: {
+            uri: `data:application/pdf;base64,${buffer.toString('base64')}`,
+            mimeType: 'application/pdf',
+            text: buffer.toString('base64'),
+          },
+        }],
+      };
+    } catch (err) {
+      return {
+        content: [{ type: 'text', text: `Failed to convert markdown to PDF: ${err.message}` }],
+        isError: true,
+      };
+    }
+  }
+);
+
+// Tool 3: Convert Markdown to PNG image
+server.tool(
+  'markdown_to_image',
+  'Convert Markdown text to a styled PNG or JPEG image. Returns the image as base64.',
+  {
+    markdown: z.string().describe('Markdown content to convert'),
+    format: z.enum(['png', 'jpeg']).default('png').optional()
+      .describe('Image format'),
+    theme: z.enum(['light', 'dark']).default('light').optional()
+      .describe('Visual theme'),
+    width: z.number().int().min(320).max(3840).default(1280).optional()
+      .describe('Image width in pixels'),
+    fontSize: z.string().default('16px').optional()
+      .describe('Base font size'),
+  },
+  async ({ markdown, format, theme, width, fontSize }) => {
+    try {
+      const resp = await apiRequest('/api/md2png', {
+        method: 'POST',
+        body: { markdown, format, theme, width, fontSize },
+      });
+
+      if (!resp.ok) {
+        const err = await resp.json().catch(() => ({ error: resp.statusText }));
+        return {
+          content: [{ type: 'text', text: `Error ${resp.status}: ${err.error || resp.statusText}` }],
+          isError: true,
+        };
+      }
+
+      const buffer = Buffer.from(await resp.arrayBuffer());
+      const mimeType = format === 'jpeg' ? 'image/jpeg' : 'image/png';
+      return {
+        content: [{
+          type: 'image',
+          data: buffer.toString('base64'),
+          mimeType,
+        }],
+      };
+    } catch (err) {
+      return {
+        content: [{ type: 'text', text: `Failed to convert markdown to image: ${err.message}` }],
+        isError: true,
+      };
+    }
+  }
+);
+
+// Tool 4: Convert Markdown to HTML (free, no auth)
+server.tool(
+  'markdown_to_html',
+  'Convert Markdown text to styled HTML. Free, no authentication required.',
+  {
+    markdown: z.string().describe('Markdown content to convert'),
+    theme: z.enum(['light', 'dark']).default('light').optional()
+      .describe('Visual theme'),
+    fontSize: z.string().default('16px').optional()
+      .describe('Base font size'),
+  },
+  async ({ markdown, theme, fontSize }) => {
+    try {
+      const resp = await apiRequest('/api/md2html', {
+        method: 'POST',
+        body: { markdown, theme, fontSize },
+      });
+
+      if (!resp.ok) {
+        const err = await resp.text();
+        return {
+          content: [{ type: 'text', text: `Error ${resp.status}: ${err}` }],
+          isError: true,
+        };
+      }
+
+      const html = await resp.text();
+      return {
+        content: [{ type: 'text', text: html }],
+      };
+    } catch (err) {
+      return {
+        content: [{ type: 'text', text: `Failed to convert markdown to HTML: ${err.message}` }],
+        isError: true,
+      };
+    }
+  }
+);
+
+// Tool 5: Get API status
+server.tool(
+  'api_status',
+  'Check the SnapAPI service health, stats, and current load.',
+  {},
+  async () => {
+    try {
+      const resp = await apiRequest('/api/status');
+      const data = await resp.json();
+      return {
+        content: [{ type: 'text', text: JSON.stringify(data, null, 2) }],
+      };
+    } catch (err) {
+      return {
+        content: [{ type: 'text', text: `Failed to get status: ${err.message}` }],
+        isError: true,
+      };
+    }
+  }
+);
+
+// Resource: API documentation
+server.resource(
+  'api-docs',
+  'snapapi://docs',
+  { description: 'SnapAPI documentation and endpoint reference' },
+  async () => {
+    try {
+      const resp = await apiRequest('/api');
+      const data = await resp.json();
+      return {
+        contents: [{
+          uri: 'snapapi://docs',
+          mimeType: 'application/json',
+          text: JSON.stringify(data, null, 2),
+        }],
+      };
+    } catch (err) {
+      return {
+        contents: [{
+          uri: 'snapapi://docs',
+          mimeType: 'text/plain',
+          text: `Failed to fetch docs: ${err.message}`,
+        }],
+      };
+    }
+  }
+);
+
+// Start server
+async function main() {
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+}
+
+main().catch((err) => {
+  process.stderr.write(`MCP server error: ${err.message}\n`);
+  process.exit(1);
+});

package-lock.json

@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
+        "@modelcontextprotocol/sdk": "^1.26.0",
         "@x402/core": "^2.3.0",
         "@x402/evm": "^2.3.0",
         "@x402/express": "^2.3.0",
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       "license": "MIT"
     },
+    "node_modules/@hono/node-server": {
+      "version": "1.19.9",
+      "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.9.tgz",
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+      "license": "MIT",
+      "engines": {
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+      "peerDependencies": {
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+    "node_modules/@modelcontextprotocol/sdk": {
+      "version": "1.26.0",
+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.26.0.tgz",
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+        "ajv": "^8.17.1",
+        "ajv-formats": "^3.0.1",
+        "content-type": "^1.0.5",
+        "cors": "^2.8.5",
+        "cross-spawn": "^7.0.5",
+        "eventsource": "^3.0.2",
+        "eventsource-parser": "^3.0.0",
+        "express": "^5.2.1",
+        "express-rate-limit": "^8.2.1",
+        "hono": "^4.11.4",
+        "jose": "^6.1.3",
+        "json-schema-typed": "^8.0.2",
+        "pkce-challenge": "^5.0.0",
+        "raw-body": "^3.0.0",
+        "zod": "^3.25 || ^4.0",
+        "zod-to-json-schema": "^3.25.1"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@cfworker/json-schema": "^4.1.1",
+        "zod": "^3.25 || ^4.0"
+      },
+      "peerDependenciesMeta": {
+        "@cfworker/json-schema": {
+          "optional": true
+        },
+        "zod": {
+          "optional": false
+        }
+      }
+    },
     "node_modules/@noble/ciphers": {
       "version": "1.3.0",
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         "negotiator": "^1.0.0"
@@ -2592,6 +2644,23 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
+    "node_modules/ajv-formats": {
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+      "license": "MIT",
+      "dependencies": {
+        "ajv": "^8.0.0"
+      },
+      "peerDependencies": {
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+      "peerDependenciesMeta": {
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+        }
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     "node_modules/ansi-regex": {
       "version": "5.0.1",
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       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=6.6.0"
       }
     },
+    "node_modules/cors": {
+      "version": "2.8.6",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.6.tgz",
+      "integrity": "sha512-tJtZBBHA6vjIAaF6EnIaq6laBBP9aq/Y3ouVJjEfoHbRBcHBAHYcMh/w8LDrk2PvIMMq8gmopa5D4V8RmbrxGw==",
+      "license": "MIT",
+      "dependencies": {
+        "object-assign": "^4",
+        "vary": "^1"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/cross-spawn": {
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-      "license": "ISC",
+      "license": "ISC"
-      "peer": true
+    },
+    "node_modules/shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+      "license": "MIT",
+      "dependencies": {
+        "shebang-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
     },
     "node_modules/side-channel": {
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       "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
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@@ -4831,7 +5005,6 @@
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@@ -4941,7 +5114,6 @@
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-      "peer": true,
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@@ -5016,7 +5187,6 @@
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@@ -5063,7 +5233,6 @@
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       "license": "MIT",
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       }
@@ -5177,6 +5346,21 @@
         "webidl-conversions": "^3.0.0"
       }
     },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -5275,6 +5459,15 @@
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
+    },
+    "node_modules/zod-to-json-schema": {
+      "version": "3.25.1",
+      "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.1.tgz",
+      "integrity": "sha512-pM/SU9d3YAggzi6MtR4h7ruuQlqKtad8e9S0fmxcMi+ueAK5Korys/aWcV9LIIHTVbj01NdzxcnXSN+O74ZIVA==",
+      "license": "ISC",
+      "peerDependencies": {
+        "zod": "^3.25 || ^4"
+      }
     }
   }
 }

package.json

@@ -7,6 +7,7 @@
     "start": "node server.js"
   },
   "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.26.0",
     "@x402/core": "^2.3.0",
     "@x402/evm": "^2.3.0",
     "@x402/express": "^2.3.0",