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Open Solid MCP server

Which MCP servers are Open Solid's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-29

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Whose server it is
  • Registry nameai.opensolid/opensolidverified in the MCP registry

The registry name sits under opensolid.ai. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-29
  • Stateanswerschecked 2026-10-29
  • Tools10
  • Server calls itselfopen-solid
  • Server version0.2.0
  • Protocol version2025-06-18

On 2026-10-29 the server answered initialize and tools/list without a sign-in. First answer in 135 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 4 of the 7 days it takes to judge reliability.

Once connected

  • For "send bank payments to registered recipients", the likely first call is list_recipients.
  • pay change data without a sign-in: anyone with the address can call them.
  • Parameters are untyped or undescribed in 4 of 10 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 4, the first on 2026-10-29
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
  • Answeredmeasuring4 of the 7 daily checks it takes to print a share
  • Median first answer169 ms
  • Space in an agent's context≈ 591 tokensthe definitions of all its tools (10), which an agent carries on every turn
  • Tool definitionsA · 93 of 100
  • Typed results0 of 10 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 4 of 10

What an agent can do with it

  • not sure · pay for a domain and software with an agent card
  • not sure · top up ad spend from an agent wallet
  • can do · send bank payments to registered recipients

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

  • Tools that change data, on a server that answers without a sign-in: pay

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers10 tools · read 2026-10-29
  • announce_connection

    Tell your human you connected. Call first.

  • get_wallet

    Wallet addresses (Solana, Base) and USDC balances.

  • get_spend_limit

    The per-payment limit your human set. Read-only.

  • get_activity

    Recent payments, deposits and connections.

  • get_pricing

    Fees and limits for every payment type.

  • get_kyc_status

    Whether the account owner has verified their identity.

  • get_banking

    US bank account numbers and transfers.

  • get_cards

    Reloadable cards, or one card's details with card_id.

  • list_recipients

    Saved payout recipients for a rail: venmo, paypal or bank.

  • pay

    PAID. Make a payment from the wallet: type is usa_card, gift_card, venmo, paypal, bank, debit, or x402 (call any x402-priced API: give url, max_usd and optionally method and body; returns the API's response). Enforces the spend limit on…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "opensolid": {
      "type": "http",
      "url": "https://opensolid.ai/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http opensolid https://opensolid.ai/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://opensolid.ai/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.