MCP Server
CrossingKey MCP
com.crossingkeyintelligence/crossingkey-mcp
What this MCP does
Discovers and preflights agent commerce capabilities, offers, payment rails, x402 requirements, purchases, and verifiable receipts.
Capabilities
Tools
13
tools
artifact.integrity_manifest
Purchase Artifact Integrity Manifest
PAID $0.10 USDC on Base via x402. Creates deterministic SHA-256 entries and a root manifest hash for supplied text artifacts. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
Open world
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['artifacts'], 'properties': {'artifacts': {'type': 'array', 'items': {'type': 'object', 'required': ['name', 'content'], 'properties': {'name': {'type': 'string', 'maxLength': 300, 'minLength': 1, 'description': 'Artifact name.'}, 'content': {'type': 'string', 'description': 'Text content to hash.'}}, 'additionalProperties': False}, 'minItems': 1, 'description': 'Artifacts to include in the integrity manifest.'}, 'idempotency_key': {'type': 'string', 'maxLength': 160, 'minLength': 8}, 'payment_payload': {'type': 'object', 'additionalProperties': {}}}, 'additionalProperties': False}
capability.execute
Execute a governed commercial capability
Executes an authorized capability contract through the canonical machine-commerce and Gate 1B path.
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['capability_id'], 'properties': {'input': {'type': 'object', 'default': {}, 'additionalProperties': {}}, 'capability_id': {'type': 'string', 'maxLength': 160, 'minLength': 1}, 'idempotency_key': {'type': 'string', 'maxLength': 160, 'minLength': 8}, 'payment_payload': {'type': 'object', 'additionalProperties': {}}}, 'additionalProperties': False}
cost.estimate
cost.estimate
FREE read-only cost estimate. This tool never creates checkout, reserves funds, or contacts a facilitator.
Read only
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['item_id'], 'properties': {'item_id': {'type': 'string', 'maxLength': 160, 'minLength': 1, 'description': 'Public offer or paid capability identifier returned by offers.list.'}}, 'additionalProperties': False}
execution.preflight
execution.preflight
FREE read-only execution preflight. Returns READY_FOR_HUMAN_AUTHORIZATION only; it never authorizes, purchases, settles, executes, or creates records.
Read only
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['item_id'], 'properties': {'item_id': {'type': 'string', 'maxLength': 160, 'minLength': 1, 'description': 'Public offer or paid capability identifier returned by offers.list.'}}, 'additionalProperties': False}
machine_commerce.readiness_audit
Purchase Machine-Commerce Readiness Audit
PAID $2.00 USDC on Base via x402. Checks machine-commerce discovery and health surfaces. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
Open world
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['url'], 'properties': {'url': {'type': 'string', 'format': 'uri', 'description': 'Base URL of the machine-commerce service to audit.'}}, 'additionalProperties': False}
mcp.schema_audit
Purchase MCP Schema Audit
PAID $1.00 USDC on Base via x402. Scores supplied MCP tool schemas for discoverability, descriptions, and bounded input contracts. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
Open world
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['tools'], 'properties': {'tools': {'type': 'array', 'items': {'type': 'object', 'additionalProperties': {}}, 'minItems': 1, 'description': 'MCP tool definitions to audit.'}}, 'additionalProperties': False}
offers.list
offers.list
FREE read-only public offer and capability discovery. This tool never starts payment or execution.
Read only
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'properties': {'limit': {'type': 'integer', 'default': 20, 'maximum': 50, 'minimum': 1, 'description': 'Maximum number of public metadata records to return.'}, 'query': {'type': 'string', 'maxLength': 160, 'description': 'Optional bounded search text.'}}, 'additionalProperties': False}
openapi.quality_audit
Purchase OpenAPI Quality Audit
PAID $1.00 USDC on Base via x402. Evaluates structural quality and required fields in an OpenAPI document. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
Open world
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['spec'], 'properties': {'spec': {'type': 'object', 'description': 'Parsed OpenAPI document to audit.', 'additionalProperties': {}}}, 'additionalProperties': False}
provider.describe
provider.describe
FREE read-only provider and commerce policy discovery. Use this before selecting an offer or capability.
Read only
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'properties': {}, 'additionalProperties': False}
requirements.check
requirements.check
FREE read-only requirements check. This tool never authorizes or starts payment or execution.
Read only
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['item_id'], 'properties': {'item_id': {'type': 'string', 'maxLength': 160, 'minLength': 1, 'description': 'Public offer or paid capability identifier returned by offers.list.'}}, 'additionalProperties': False}
result.preview
result.preview
FREE read-only result-shape preview. This tool never executes a capability or creates an entitlement or receipt.
Read only
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['item_id'], 'properties': {'item_id': {'type': 'string', 'maxLength': 160, 'minLength': 1, 'description': 'Public offer or paid capability identifier returned by offers.list.'}}, 'additionalProperties': False}
x402.compatibility_audit
Purchase x402 Compatibility Audit
PAID $1.00 USDC on Base via x402. Audits an x402 endpoint for v1/v2 compatibility defects. Calling this MCP tool does not spend funds; it returns the exact PAYMENT-REQUIRED challenge and canonical paid execution endpoint.
Open world
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['url'], 'properties': {'url': {'type': 'string', 'format': 'uri', 'description': 'Public HTTP(S) x402 endpoint to audit.'}}, 'additionalProperties': False}
xkey.validate
Validate structured XKEY intake
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.
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['idempotency_key', 'raw_intake'], 'properties': {'raw_intake': {'type': 'string', 'maxLength': 100000, 'minLength': 2, 'description': 'Raw intake text to validate and normalize; 2-100000 characters.'}, 'idempotency_key': {'type': 'string', 'pattern': '^[A-Za-z0-9._:-]+$', 'maxLength': 160, 'minLength': 8, 'description': 'Unique client-generated idempotency key; 8-160 ASCII characters.'}}, 'additionalProperties': False}
History
Recent tool changes
Added
capability.execute
Oct. 1, 2026, 2:53 a.m.
Changed
artifact.integrity_manifest
Oct. 1, 2026, 2:53 a.m.
Restored
execution.preflight
Sept. 29, 2026, 3:01 a.m.
Restored
result.preview
Sept. 29, 2026, 3:01 a.m.
Restored
cost.estimate
Sept. 29, 2026, 3:01 a.m.
Restored
requirements.check
Sept. 29, 2026, 3:01 a.m.
Restored
offers.list
Sept. 29, 2026, 3:01 a.m.
Restored
provider.describe
Sept. 29, 2026, 3:01 a.m.
Removed
system.health
Sept. 25, 2026, 3:02 a.m.
Removed
service.list
Sept. 25, 2026, 3:02 a.m.
Removed
result.preview
Sept. 25, 2026, 3:02 a.m.
Removed
requirement.check
Sept. 25, 2026, 3:02 a.m.
Removed
receipt.verify
Sept. 25, 2026, 3:02 a.m.
Removed
purchase.status
Sept. 25, 2026, 3:02 a.m.
Removed
provider.register
Sept. 25, 2026, 3:02 a.m.
Removed
provider.get
Sept. 25, 2026, 3:02 a.m.
Removed
provider.describe
Sept. 25, 2026, 3:02 a.m.
Removed
payment.verify
Sept. 25, 2026, 3:02 a.m.
Removed
payment.methods
Sept. 25, 2026, 3:02 a.m.
Removed
offer.list
Sept. 25, 2026, 3:02 a.m.
Removed
marketplace.describe
Sept. 25, 2026, 3:02 a.m.
Removed
machine_capability.quote
Sept. 25, 2026, 3:02 a.m.
Removed
machine_capability.list
Sept. 25, 2026, 3:02 a.m.
Removed
execution.preflight
Sept. 25, 2026, 3:02 a.m.
Removed
entitlement.inspect
Sept. 25, 2026, 3:02 a.m.
Removed
credit.options
Sept. 25, 2026, 3:02 a.m.
Removed
creator.apply
Sept. 25, 2026, 3:02 a.m.
Removed
cost.estimate
Sept. 25, 2026, 3:02 a.m.
Removed
commerce.quote
Sept. 25, 2026, 3:02 a.m.
Removed
catalog.list
Sept. 25, 2026, 3:02 a.m.
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