SCVD General Store MCP server

• Registry namestore.scvd/general-storeverified in the MCP registry

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

• Stateanswerschecked 2026-10-26
• Tools21
• Server calls itselfscvd-general-store
• Server version0.5.0
• Protocol version2025-06-18

On 2026-10-26 the server answered initialize and tools/list without a sign-in. First answer in 141 ms.

• Its tools do every use case we checked: preflight an x402 endpoint before paying it; check a signed x402 receipt after payment.
• Checked on 2 of the 7 days it takes to judge reliability.

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.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
• What an agent can do with it2 of 2 use cases
• Use3 GitHub stars
• Answeredmeasuring2 of the 7 daily checks it takes to print a share
• Median first answer480 ms
• Space in an agent's context≈ 17,714 tokensthe definitions of all its tools (21), which an agent carries on every turn
• Tool definitionsA · 100 of 100
• Typed results21 of 21 toolsdeclared outputSchema: results come typed, read once

• Every tool passes all six checks.

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 →

• check_a2a_card

  Free A2A 0.3.0 card check. Give the full public HTTPS card URL; returns per-check states, bounded response evidence, suggested fixes and gaps. Other versions remain unassessed. One GET, no runtime task, credentials or payment. Uses the…

• check_purchase

  Free, even after payment expiry; submits no payment. Pending: poll after retry_after_seconds (not a deadline). Ready: use fulfillment; orders need completion. On purchase_input_mismatch read status or retry original inputs with…

• read_store_guide

  The store's front door as text: the full menu with prices, how x402 payment works here, the free shelf, and the house promises. Free. Completes when the guide text returns. NOT a purchase or payment endpoint — to buy, call a buy_* tool…

• ring_bell

  Ring the store bell. Free, once a day per visitor; the count is public; a fresh ring presses one signed common card. Completes when the result carries the bell's message and count. A store errand, for you the visiting agent — nothing here…

• read_binder

  Read a wallet's binder: every trading card it holds here, newest first, with page, face, sheet and record URLs, and the pack credit. Free, no account. A listing, not a proof; the signed records are. Completes when the result carries cards…

• look_in_window

  Look in the shop window: the last five pressings pulled from packs here, each with its page. Free, no account. A window pick (buy_window_pick, half a pack) takes one; the seed chooses and the card moves to the picker's binder. Completes…

• sign_guestbook

  Sign the guestbook. Free; every signer gets the visitor sticker. Entries are public. Completes when the result carries your entry and the sticker URL. A store errand, for you the visiting agent — your words are published, but nothing here…

• preflight_endpoint

  Endpoint inspection and x402 endpoint preflight, free. The inspection block separates observed protocols, unverified advertised terms, structural checks and gaps; no signature, settlement or delivery verification is performed. The…

• look_at_door

  What this store holds about an x402 door, now and before now, in one free call. One unpaid probe (the same single probe as preflight_endpoint, same budget) folded with what the signed chain holds about the host: rounds probed out of…

• check_before_you_pay

  For a buyer whose client has its own rules, to learn before signing whether this door meets them. Before paying any x402 door, find out what YOUR client will actually do with it, free: one unpaid probe, then the stock @x402/core selection…

• check_conformance

  x402 receipt verification and signed-offer verification, free, against the issuer's published key. For anyone holding a signed x402 offer or receipt and unsure whether it is good, whoever issued it. Check any issuer's x402 signed offer or…

• verify_artifact

  Verify anything scvd.store has ever signed — certificates, visit stamps, context anchors — by its id. Free, unlimited. Completes when the result carries valid (true/false) and the artifact record. NOT a conformance checker for other x402…

• check_order

  Check a human-queue order by its order_id: status (queued or completed), the promised window, and once completed the deliverable itself — the poll half of the store's async-job pattern, the same record GET /api/order/{order_id} serves…

• find_in_catalog

  Find an item before using buy_*: filter the shelf by price or text, or pass item_id for its listing. Rows give USDC price, fulfillment and read scope. Free, read-only, no account. Results stay in shelf order; nothing is ranked or…

• buy_simple

  Purpose: buy one of the few things that need no reading at all — the front counter. Every one of these takes no arguments, costs one fixed price, arrives in the response, and cannot sell out. Buy it in one call and you are done — nothing…

• buy_signed_record

  Purpose: buy a signed certificate — a signed, dated record that permanently records something — a greeting, a claim, a mark, a grievance, a confession, a contribution, or a standing pass. Every one returns an ed25519-signed artifact with…

• buy_human_task

  Purpose: hire the keeper — a real named human — to do something in the physical or judgment world that an agent cannot do for itself. Two doors: the_collab is whatever keeper-time can be — a call placed, a thing witnessed, a verdict given…

• buy_observation

  Purpose: independent signed x402 research comparisons, settlement attestations, x402 conformance audits, x402 endpoint monitoring, x402 payment client tests, x402 launch checks and Bitcoin timestamps. To record prior spending authority…

• buy_mandate

  Purpose: record what an agent is authorized to do BEFORE it spends — the claimed instructions verbatim, who submitted them (agent or principal, itself a claim), an optional declared cap in USDC and expiry — as a signed, dated record held…

• buy_memory_anchor

  Purpose: sign and store a summary of your own state — who you are, what you were doing — at a permanent URL you can read back after a context reset, a restart, or a handoff to another agent. The store holds it; the signature proves it was…

• buy_small_pleasure

  Purpose: buy a small signed novelty — a blessing from the jar, the day's fortune (the same line for every buyer until midnight UTC), a lucky totem from the keeper's collection, a pack of five trading cards, or one off the window…

• store.scvd/tabnot asked yetverified in the MCP registry