# CrossingKey MCP

> Agent-native MCP for governed commerce, x402 payments, paid capabilities, and verifiable receipts.

- name: com.crossingkeyintelligence/crossingkey-mcp
- version: 3.0.1
- connection class: unknown (unknown)
- trust: 66/100 flags: unreachable
- quality: 72/100 (needs work)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.crossingkeyintelligence%2Fcrossingkey-mcp
- tools: https://api.protogrid.dev/v1/servers/com.crossingkeyintelligence%2Fcrossingkey-mcp/tools

**Not classified yet.** The remote endpoints have not been probed successfully, or the listing has nothing to connect to.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "crossingkey-mcp": {
      "type": "http",
      "url": "https://mcp.crossingkeyintelligence.com/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 0
- freshness: 100
- provenance: 85
- drivers: +repository +dns-namespace +website -unreachable(3 failures) +updated-10d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 72/100 (needs work)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 93 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 28 of 28 tools declare readOnlyHint or destructiveHint
- warn `tools.directory_hints`: 13 of 28 tools declare all four hints; missing: marketplace.describe (idempotentHint); provider.apply (idempotentHint); provider.get (idempotentHint); …
- pass `tools.token_cost`: about 4,704 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 25 (weight 15)

- warn `stability.changes`: 53 tool changes in 30 days
- fail `stability.rug_pull`: 2 tools kept their name but changed most of their description in 30 days; review before trusting them

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 28, about 4,704 tokens to load them all
- tool set hash: 108785d7674f657f0eb7bc22218a3f15
- tools last changed: 2026-10-16T14:59:05.997Z
- badge: [![protogrid quality](https://protogrid.dev/badge/com.crossingkeyintelligence/crossingkey-mcp.svg)](https://protogrid.dev/servers/com.crossingkeyintelligence/crossingkey-mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-16 `xkey.validate` changed (title, description, outputSchema, annotations) **meaning changed**
  - before: PAID prepaid-credit XKEY intake validation. Requires an authenticated ck_ principal and commits one credit only on verified success. Discovery is free; execution is not.
  - after: PAID $0.10 USDC on Base via x402. Validates and normalizes one bounded XKEY intake payload. Calling this MCP tool returns the exact PAYMENT-REQUIRED challenge and does not spend funds.
- 2026-10-16 `x402.purchase_path_audit` added
  - PAID $19.00 USDC on Base via x402. Performs a bounded no-payment purchase-challenge audit for a selected capability, validating status, requirements, destination, amount, and receiver-only controls.
- 2026-10-16 `mcp.launch_audit` added
  - PAID $9.00 USDC on Base via x402. Performs bounded live MCP discovery, health, transport, schema, and receiver-only checks against a public endpoint. No payment is attempted by the audit.
- 2026-10-16 `prompt.audit` changed (outputSchema, annotations)
- 2026-10-16 `json.repair` changed (outputSchema, annotations)
- 2026-10-16 `pii.scan` changed (outputSchema, annotations)
- 2026-10-16 `secret.scan` changed (outputSchema, annotations)
- 2026-10-16 `hash.encode` changed (outputSchema, annotations)
- 2026-10-16 `artifact.integrity_manifest` changed (inputSchema, outputSchema, annotations)
- 2026-10-16 `machine_commerce.readiness_audit` changed (outputSchema, annotations)

Full history: https://api.protogrid.dev/v1/servers/com.crossingkeyintelligence%2Fcrossingkey-mcp/changes

## Remotes

- https://mcp.crossingkeyintelligence.com/mcp (streamable-http, auth none, reachable false, uptime30d 0.64285713)

## Packages

_none_

## Tools (28)

- `artifact.integrity_manifest`: PAID $0.10 USDC on Base via x402. Creates deterministic SHA-256 entries and a root manifest hash for supplied text artifacts. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
- `capability.get`: FREE. Use name for legacy deterministic capability metadata or capabilityId for public marketplace metadata, rights and provenance.
- `capability.search`: FREE MARKETPLACE FILTERED DISCOVERY ONLY. Search active public marketplace capabilities when one or more filters are known: text, category, provider, delivery type, or price. Metadata is free; purchased execution and deliverables are not. Do NOT use for unfiltered browsing; use catalog.list. Do NOT use for CrossingKey digital/service offers; use offers.list. For one exact capabilityId use capability.get.
- `catalog.list`: FREE MARKETPLACE UNFILTERED DISCOVERY ONLY. Page through active public marketplace capabilities when no search filters are needed. Metadata is free; execution, entitlement, delivery, and purchased output remain gated. Do NOT use for filtered discovery; use capability.search. Do NOT use for CrossingKey digital/service offers; use offers.list. For one exact capabilityId use capability.get.
- `commerce.quote`: FREE MARKETPLACE PAYMENT QUOTE ONLY. After selecting an active marketplace capabilityId, return authoritative gross price, CrossingKey fee, provider share, and x402 v1/v2 payment requirements. A quote grants no entitlement and performs no execution. Do NOT use for first-party paid capabilities; use cost.estimate (first-party x402 capabilities have fixed catalog prices and no quote stage). Do NOT use for generic price lookup; use cost.estimate. Paid marketplace execution requires capability.purchase with authorization and verified payment.
- `cost.estimate`: FREE read-only cost estimate. This tool never creates checkout, reserves funds, or contacts a facilitator.
- `creator.apply`: FREE WRITE. Private creator intake for assets needing a capability model. No ownership transfer and AI training defaults false.
- `credits.options`: FREE read-only legacy credit compatibility status. New prepaid-credit sales are disabled in v4; historical paid credits remain redeemable through a separate compatibility path.
- `execution.preflight`: FREE read-only execution preflight. Returns READY_FOR_HUMAN_AUTHORIZATION only; it never authorizes, purchases, settles, executes, or creates records.
- `hash.encode`: PAID $0.01 USDC on Base via x402. Computes a SHA-256 digest and UTF-8 byte count for supplied text. Calling this MCP tool returns a payment challenge and does not autonomously spend funds.
- `json.repair`: PAID $0.01 USDC on Base via x402. Validates JSON and repairs a limited set of formatting errors. May return supplied content. Calling this MCP tool returns a payment challenge and does not autonomously spend funds.
- `machine_commerce.readiness_audit`: PAID $2.00 USDC on Base via x402. Checks machine-commerce discovery and health surfaces. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
- `marketplace.describe`: FREE, read-only marketplace overview. Use this first for marketplace-specific capability commerce, fee policy, creator rights, payment rails, and active catalog counts; use provider.describe for the broader CrossingKey provider and legacy offer surface.
- `mcp.launch_audit`: PAID $9.00 USDC on Base via x402. Performs bounded live MCP discovery, health, transport, schema, and receiver-only checks against a public endpoint. No payment is attempted by the audit.
- `mcp.schema_audit`: PAID $1.00 USDC on Base via x402. Scores supplied MCP tool schemas for discoverability, descriptions, and bounded input contracts. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
- `offers.list`: FREE read-only public offer and capability discovery. This tool never starts payment or execution.
- `openapi.quality_audit`: PAID $1.00 USDC on Base via x402. Evaluates structural quality and required fields in an OpenAPI document. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
- `pii.scan`: PAID $0.01 USDC on Base via x402. Detects selected personal-data patterns and returns classifications and positions, not matched values. Heuristic, not comprehensive. Calling this MCP tool returns a payment challenge and does not autonomously spend funds.
- `prompt.audit`: PAID $0.01 USDC on Base via x402. Scores selected prompt structure signals using deterministic heuristics. Calling this MCP tool returns a payment challenge and does not autonomously spend funds.
- `provider.apply`: FREE public application intake. Always pending, never creates credentials or active capabilities.
- `provider.describe`: FREE read-only provider and commerce policy discovery. Use this before selecting an offer or capability.
- `provider.get`: FREE. Public active provider metadata. Pending applications require owner or administrator authorization.
- `requirements.check`: FREE read-only requirements check. This tool never authorizes or starts payment or execution.
- `result.preview`: FREE read-only result-shape preview. This tool never executes a capability or creates an entitlement or receipt.
- `secret.scan`: PAID $0.01 USDC on Base via x402. Detects selected credential patterns and returns classifications and positions, not matched values. Heuristic, not comprehensive. Calling this MCP tool returns a payment challenge and does not autonomously spend funds.
- `x402.compatibility_audit`: PAID $1.00 USDC on Base via x402. Audits an x402 endpoint for v1/v2 compatibility defects. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
- `x402.purchase_path_audit`: PAID $19.00 USDC on Base via x402. Performs a bounded no-payment purchase-challenge audit for a selected capability, validating status, requirements, destination, amount, and receiver-only controls.
- `xkey.validate`: PAID $0.10 USDC on Base via x402. Validates and normalizes one bounded XKEY intake payload. Calling this MCP tool returns the exact PAYMENT-REQUIRED challenge and does not spend funds.