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Rail-agnostic pay-per-call for MCP tools and APIs. Agents pay per call and you keep custody. Lightning today, more rails next. Built for tool builders and AI teams.

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All productsbolthub Pay SDKHosted platformToolClientAPI HubNode LauncherPricingFor tool buildersFor agentsCharge for your toolsDocs

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API HubBlogWhat is L402?L402 vs x402RSS feed

Packages

npm

@bolthub/​payTool-payment SDK@bolthub/​agentL402 payment client@bolthub/​cliCLI@bolthub/​mcp-registryRegistry MCP@bolthub/​mcp-bridgeBridge MCP@bolthub/​verifyWebhook verifier

PyPI

bolthubPython SDKbolthub-verifyPython verifier
bolthub

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products

Four products. One payment layer.

Everything bolthub ships, and what each piece is for. Open source where you run it, hosted where we run it, and non-custodial everywhere: payments settle straight to the seller's wallet.

How it fits together

Agent (buyer)
Funds: direct, per call — Lightning today, x402 next
Tool (seller)
Agent (buyer)
Control: challenge, verify, meter — this is where bolthub sits
Tool (seller)

Every product below lives on the control line. Money always moves on the top line, buyer to seller, and never passes through bolthub. The SDK runs the control line yourself, for free; the hosted platform runs it for you.

Open source · MIT · Free

bolthub Pay SDK

The SDK. Price any MCP tool or HTTP endpoint in a few lines, and pay for tools from your agent within a hard budget. Rails are pluggable: Lightning (L402) is live, x402 stablecoins ship in the SDK. Self-host it with no account and keep 100%.

See the Pay SDKRead the SDK docs
4,000 sats/mo + usage

The hosted platform

One plan, two on-ramps. The hosted gateway puts an existing HTTP API behind a no-code paywall. The hosted facilitator backs your SDK integration with managed metering, replay protection, API keys, and analytics. Either way, funds settle to your wallet.

See the hosted platformSee pricing
Free to browse

API Hub

The public directory where agents and developers discover paid tools, preview pricing, and try a first call from the playground. Listing is included in the hosted platform.

See the API HubBrowse the Hub
From ~$3.50/mo

Node Launcher

No Lightning wallet yet? Deploy your own non-custodial node on a VPS you control, in minutes. Your seed never leaves your browser, and bolthub holds no credential for the machine.

See Node LauncherDeploy your node
Proxy coming in @bolthub/pay 0.3.0

ToolClient: make your agent payment-ready

The buyer side of bolthub Pay, and the reason to install it before you ever buy anything: your agent can never spend money you didn’t explicitly budget, including zero. Free tools stay free. Paid tools just work, inside the cap you set.

Available in code today as the budgeted client in @bolthub/pay. Next up: one config entry that proxies all your MCP servers, passes free tools through untouched, and handles payment challenges automatically.

Built to be trusted with that position: open source (MIT) with zero runtime dependencies, so you can audit exactly what sits between your agent and its tools.

See ToolClientBuyer quickstart

Which one do I need?

You have a REST API and want to charge for it without writing codeHosted gatewayYou built an MCP server and want to price its toolsThe Pay SDK, backed by the hosted facilitator when you want meteringYou're building an agent that calls toolsToolClient, the buyer side of the Pay SDKYou're exploring what's already for saleAPI Hub
Selling? Start free with the SDK. Buying? One client pays every rail.

start selling

Start earning from your tools today

Self-host the SDK free, or start on the hosted platform: 1-month free trial, usage-based billing after that.

Start your free trialStart free with the SDK

hub / btc-intel

  • GET /v1/derivatives/cme-basis3 sats/req
  • GET /v1/market/multi_exchange3 sats/req

LIVE32 endpoints · btc-intel.gw.bolthub.ai

browse the hub →