Website · Quick start · API · MCP setup · Self-host

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Agents can now pay for APIs on their own, over x402 and MPP. There are tens of thousands of paid endpoints, and many of them are down, slow or overpriced at any given moment. SwitchBord tells your agent which ones to call. It asks for a task in plain words, like "search the web" or "ETH price", and gets back the sellers that are working, cheapest and fastest right now, checked live just before the answer, plus backups.

Free and open	No signup, no keys, no auth. MIT-licensed code you can read, run and fork.
Never touches your money	Your agent pays the seller directly with its own wallet. SwitchBord only says who to call.
Live, not a directory	The top candidates get a free, unpaid check right before the answer, so dead sellers drop out.
One inventory, every protocol	Every endpoint on Coinbase Bazaar (x402) and mpp.dev (MPP), rebuilt daily and grouped into markets of interchangeable sellers.

Quick start

Claude Code

claude mcp add --transport http switchbord https://switchbord.vercel.app/mcp

Cursor, Windsurf, Cline and any client that reads an mcpServers block:

{ "mcpServers": { "switchbord": { "type": "http", "url": "https://switchbord.vercel.app/mcp" } } }

Plugins, Gemini CLI and other clients

• Claude Code plugin: /plugin marketplace add 6ixtyy/switchbord, then /plugin install switchbord@switchbord
• Gemini CLI: gemini extensions install https://github.com/6ixtyy/switchbord
• Claude Desktop, VS Code and others: see MCP.md

Or just call the HTTP API:

curl "https://switchbord.vercel.app/route?task=search%20the%20web&accepts=x402:base:usdc&max_price=0.05"

What you get back

A real answer for "search the web", trimmed to two candidates:

{
  "mode": "market",
  "market": "web-search",
  "sellersMatched": 99,
  "candidates": [
    {
      "rank": 1,
      "service": "StableEnrich",
      "method": "POST",
      "url": "https://stableenrich.dev/api/exa/search",
      "priceUsd": 0.01,
      "pay": ["x402:base:usdc"],
      "charges": "after_success",          // x402: only charged when the seller answers OK
      "input": { "body": { "query": "…", "numResults": 10 } },
      "up": true, "ms": 264                // checked live just now
    },
    {
      "rank": 2,
      "url": "https://win.oneshotagent.com/v1/tools/search",
      "priceUsd": 0.001,
      "up": true, "ms": 217
      // …
    }
  ]
}

Every field is documented in API.md. Runnable snippets are in examples/.

How it works

sequenceDiagram
    participant A as Your agent
    participant S as SwitchBord
    participant P as Sellers (x402 / MPP)
    A->>S: "search the web", accepts x402:base:usdc, max $0.05
    S->>P: free, unpaid check of the top matches
    P-->>S: payment terms + response time
    S-->>A: ranked sellers, plus backups
    A->>P: call the best one and pay it directly
    A-->>S: (optional) report how it went

Loading

1. Inventory. Every day SwitchBord pulls every listed endpoint from Coinbase Bazaar and mpp.dev, merges them and groups interchangeable sellers into markets.
2. Match. Your task is matched to a market. If none fits, you still get the closest single endpoints.
3. Check live. The top candidates get an unpaid request that reads their payment terms, so sellers that are down or misconfigured drop out.
4. Rank. Candidates are ordered by health, speed, price and real-world results. The full logic is in src/router.ts and src/health.ts.

Reference

MCP tool	Use it to
find_paid_endpoint	Get the best sellers for a task, with backups. Pass accepts (e.g. ["x402:base:usdc"]) so you only get sellers you can pay.
list_markets	See the markets and how many sellers each has.
report_result	Optional: say how a call went, which improves rankings for everyone.

HTTP endpoint	What it returns
GET /route?task=…	Ranked sellers for a task, checked live
GET /markets	Markets and seller counts
GET /endpoints/:id	One endpoint from the inventory
POST /report	Optional: how a call went
GET /healthz	Inventory size and when it was last rebuilt
POST /mcp	The MCP server (streamable HTTP, stateless)

Paying sellers

SwitchBord does not pay for you, hold funds, or guarantee sellers. To call a paid seller, your agent needs its own wallet and an x402 or MPP client, for example Coinbase's @x402/fetch. Each candidate says how it charges:

• after_success (x402): charged only when the seller answers OK, so trying a backup after a failure is safe.
• before_handler (MPP): charged up front.

Run it yourself

The hosted service at switchbord.vercel.app runs this code. You can run your own copy with Node 22:

git clone https://github.com/6ixtyy/switchbord && cd switchbord
npm ci
npm run inventory   # pull Bazaar + mpp.dev, merge and classify → data/inventory.json
npm start           # API and MCP on http://localhost:8402

Everything works with no configuration. These environment variables are optional:

Variable	What it does	Without it
PORT	Port for the local server	8402
SB_REBUILD_MS	How often the local server rebuilds the inventory	every 6 hours
DATABASE_URL or POSTGRES_URL	Saves every live check to Postgres	data/checks.jsonl
BLOB_READ_WRITE_TOKEN	Keeps state in Vercel Blob between serverless runs	local files
CRON_SECRET	Lets your scheduler run the rebuild and sampling routes at any time	open to anyone, rate-limited

To deploy on Vercel, import the repo: vercel.json builds the inventory and the function, and runs the daily rebuild.

Code map

Path	What
src/sources/	Pull listings from Coinbase Bazaar (x402) and mpp.dev (MPP)
src/inventory.ts, markets.ts, labels.ts	Merge into one inventory, group into markets, label payment options
src/health.ts	Free live checks: an unpaid request that reads the seller's 402
src/router.ts	Matching, ranking and backups
src/history.ts	Check history (Postgres or a local file)
src/app.ts, mcp-tools.ts	HTTP API and the remote MCP server
src/server.ts, vercel.ts	Local server and Vercel entry
site/	switchbord.xyz: one static page, no build step
scripts/	Vercel build and the API contract check
examples/	curl, Node and MCP snippets

Contributing

Issues and pull requests are welcome. Bad rankings, dead sellers, new protocols and docs fixes are all useful. Read CONTRIBUTING.md first; for security issues see SECURITY.md. What changed: CHANGELOG.md. For language models: llms.txt. Privacy: PRIVACY.md.

License

MIT