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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "crosscheck": {
      "type": "http",
      "url": "https://crosscheckapi.com/mcp"
    }
  }
}

claude mcp add --transport http crosscheck https://crosscheckapi.com/mcp

[mcp_servers.crosscheck]
url = "https://crosscheckapi.com/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "crosscheck": {
      "type": "remote",
      "url": "https://crosscheckapi.com/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "crosscheck": {
      "type": "http",
      "url": "https://crosscheckapi.com/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=crosscheck&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vY3Jvc3NjaGVja2FwaS5jb20vbWNwIn0%3D"
}

{
  "servers": {
    "crosscheck": {
      "type": "http",
      "url": "https://crosscheckapi.com/mcp"
    }
  }
}

{
  "mcpServers": {
    "crosscheck": {
      "httpUrl": "https://crosscheckapi.com/mcp"
    }
  }
}

extensions:
  "crosscheck":
    enabled: true
    name: "crosscheck"
    type: streamable_http
    uri: "https://crosscheckapi.com/mcp"
    timeout: 300

Quality 73 / 100needs work

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene71 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
fail
tools.annotationsno tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: skillcheck (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); skillcheck_lookup (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); check (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
pass
tools.token_costabout 1,850 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability75 · weight 15

warn
stability.changes9 tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvabledeps.dev does not know [email protected]

6 tools, about 1,850 tokens to load them all · tool set 471aeba81922 · tools last changed 2026-09-27 · checked 2026-10-19 10:52 UTC

Tool changes

2026-09-27verify_receiptchangeddescription, input schema
before
Free. Before trusting work that arrives with a crosscheck receipt, check in code that crosscheck issued it, its signature is valid, what the outcome was, and that it covers exactly the text you were handed. Pass receipt_hash (or the receipt object) plus that text: draft and sources for check, task and deliverable for accept, files for skillcheck, and the verdict if one came with it.
after · 98% of words in common
Free. Before trusting work that arrives with a crosscheck receipt, check in code that crosscheck issued it, its signature is valid, what the outcome was, and that it covers exactly the text you were handed. Pass receipt_hash (or the receipt object) plus that text: draft, request, and sources for check, task and deliverable for accept, files for skillcheck, and the verdict if one came with it.
2026-09-27checkchangeddescription, input schema
before
Independent review of a draft (email, report, summary, PR description) before its human sees it. Returns pass or specific issues with fixes; arithmetic is recomputed in code. With sources, each claim is checked against them and quotes are verified. $0.02. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia). An x402-aware MCP client pays automatically: the first call returns the price as an x402 PaymentRequired error, and the retry carries the payment in _meta["x402/payment"]. Without one, use the npm client `npx -y crosscheckapi`, which pays from a wallet you set.
after · 75% of words in common
Independent review of a draft (email, report, summary, PR description) before its human sees it. Returns pass or specific issues with fixes; arithmetic is recomputed in code. With request (what the human asked), it also checks the draft answers that. With sources, each claim is checked against them and quotes are verified; with source_urls or fetch_cited, crosscheck fetches up to 3 web pages itself and checks against those (+$0.01 a page, and a dead link the draft gives fails it). $0.02. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia). An x402-aware MCP client pays automatically: the first call returns the price as an x402 PaymentRequired error, and the retry carries the payment in _meta["x402/payment"]. Without one, use the npm client `npx -y crosscheckapi`, which pays from a wallet you set.
2026-09-26verify_receiptadded
Free. Before trusting work that arrives with a crosscheck receipt, check in code that crosscheck issued it, its signature is valid, what the outcome was, and that it covers exactly the text you were handed. Pass receipt_hash (or the receipt object) plus that text: draft and sources for check, task and deliverable for accept, files for skillcheck, and the verdict if one came with it.
2026-09-26checkchangedinput schema
2026-09-26checkchangedinput schema
2026-09-25skillcheckchangedinput schema
2026-09-25acceptchangedinput schema
2026-09-25checkchangedinput schema
2026-09-25skillcheckchangedinput schema

Full history: list_changes · trend: quality JSON.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 95 / 100

provenance85

liveness97

freshness100

hygiene100

+repository +dns-namespace +website +reachable +uptime-92% +updated-21d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

[email protected] npmthis version is not known to the dependency resolver

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://crosscheckapi.com/mcp` streamable-http	none	yes	92%	375 ms	2025-06-18	2026-10-19

package	registry	version	runtime	secrets
`crosscheckapi`	npm	0.5.5	–	`CROSSCHECK_WALLET_KEY`

Tools (6)

`accept`	Checks work another agent handed back against the task it was given, before you pay, release escrow, or pass it on. Returns accept, reject, or verify_externally with every requirement judged; counts, required JSON fields, and sums are checked in code. Optional payment_tx is verified on chain. $0.03 base. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia). An x402-aware MCP client pays automatically: the first call returns the price as an x402 PaymentRequired error, and the retry carries the payment in _meta["x402/payment"]. Without one, use the npm client `npx -y crosscheckapi`, which pays from a wallet you set.
`check`	Independent review of a draft (email, report, summary, PR description) before its human sees it. Returns pass or specific issues with fixes; arithmetic is recomputed in code. With request (what the human asked), it also checks the draft answers that. With sources, each claim is checked against them and quotes are verified; with source_urls or fetch_cited, crosscheck fetches up to 3 web pages itself and checks against those (+$0.01 a page, and a dead link the draft gives fails it). $0.02. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia). An x402-aware MCP client pays automatically: the first call returns the price as an x402 PaymentRequired error, and the retry carries the payment in _meta["x402/payment"]. Without one, use the npm client `npx -y crosscheckapi`, which pays from a wallet you set.
`result`	Free. Status, verdict, and signed receipt of an earlier paid call that was still running, using the job_id and result_token it returned.
`skillcheck`	Security review of a skill or MCP server's files before you install or connect it: read, never run. Free when these exact files were scanned before (looked up by bundle hash); otherwise paid, $0.03 base. Never says safe. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia). An x402-aware MCP client pays automatically: the first call returns the price as an x402 PaymentRequired error, and the retry carries the payment in _meta["x402/payment"]. Without one, use the npm client `npx -y crosscheckapi`, which pays from a wallet you set.
`skillcheck_lookup`	Free. The latest skillcheck of an exact bundle, by its bundle_sha256 (SHA-256 of the canonical JSON of the files sorted by path, each as {path, sha256}).
`verify_receipt`	Free. Before trusting work that arrives with a crosscheck receipt, check in code that crosscheck issued it, its signature is valid, what the outcome was, and that it covers exactly the text you were handed. Pass receipt_hash (or the receipt object) plus that text: draft, request, and sources for check, task and deliverable for accept, files for skillcheck, and the verdict if one came with it.

Schemas: list_tools.

Official server.json

{
  "name": "com.crosscheckapi/crosscheck",
  "title": "crosscheck",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://crosscheckapi.com/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "0.5.5",
  "packages": [
    {
      "version": "0.5.5",
      "transport": {
        "type": "stdio"
      },
      "identifier": "crosscheckapi",
      "registryType": "npm",
      "environmentVariables": [
        {
          "name": "CROSSCHECK_WALLET_KEY",
          "format": "string",
          "isSecret": true,
          "description": "Private key of a dedicated EVM wallet with a few dollars of USDC on Base (or test USDC on Base Sepolia). Pays for checks."
        },
        {
          "name": "CROSSCHECK_MAX_USD",
          "format": "string",
          "description": "Refuse to pay more than this per check. Default 0.10."
        },
        {
          "name": "CROSSCHECK_NETWORKS",
          "format": "string",
          "description": "Networks to pay on, in order of preference. Default eip155:8453,eip155:84532. Set eip155:84532 for test USDC only."
        }
      ]
    }
  ],
  "repository": {
    "url": "https://github.com/maxugc/crosscheck",
    "source": "github",
    "subfolder": "client"
  },
  "websiteUrl": "https://crosscheckapi.com",
  "description": "Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install."
}