GateCheck by LarryBuildsAI
One-cent x402 and MCP readiness checks plus fixed-price marketplace launch packs.
Should I use this
Quality & Safety
A
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
~2,198Tokens (tool definitions)
~3.6 KBTypical response size
Moderate attention impact (1.72% of 128k context)
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"gatecheck": {
"url": "https://x402-resource-scanner.vercel.app/gatecheck/mcp"
}
}
}Remote endpoints
https://x402-resource-scanner.vercel.app/gatecheck/mcpstreamable-httphttps://proofbeforepay.vercel.app/gatecheck/mcpstreamable-httpWhat it can do
Tool inventory
Tools (6)
🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢boundary_guard_check(nextStep, policy, request, result)
Create a deterministic, read-only pre-action receipt from request, policy, and optional result evidence. Use before an agent posts, spends, lists, or writes so the decision can be audited; no external action is executed.
Input Schema
{
"type": "object",
"properties": {
"nextStep": {
"description": "Optional guidance stored in the receipt.",
"type": "string"
},
"policy": {
"description": "Decision object, e.g. allow/retry/review/block and reason.",
"type": "object"
},
"request": {
"description": "Action metadata the agent is about to perform.",
"type": "object"
},
"result": {
"description": "Optional result or dry-run summary to hash into evidence.",
"type": "object"
}
},
"required": [
"request"
],
"additionalProperties": true
}Output Schema
{
"type": "object",
"properties": {
"claimBoundary": {
"type": "string"
},
"createdAt": {
"type": "string"
},
"decision": {
"type": "string"
},
"evidenceHash": {
"type": "string"
},
"marketplacePositioning": {
"type": "object"
},
"nextStep": {
"type": "string"
},
"receiptId": {
"type": "string"
}
},
"required": [
"receiptId",
"createdAt",
"decision",
"evidenceHash",
"claimBoundary"
],
"additionalProperties": true
}🟢scan_x402_resource(expected_resources, marketplace_url, url)
Read-only scan of a public API/provider URL for x402, OpenAPI, pricing, and agent-discovery metadata. Pass url, and optionally marketplace_url plus expected_resources, to get a readiness score, issues, and fixes; no private endpoints are called.
Input Schema
{
"type": "object",
"properties": {
"expected_resources": {
"description": "Optional expected resource count.",
"type": "integer"
},
"marketplace_url": {
"description": "Optional marketplace/listing URL to compare against public metadata.",
"type": "string"
},
"url": {
"description": "Target API/provider base URL to scan.",
"type": "string"
}
},
"required": [
"url"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"issues": {
"items": {
"type": "string"
},
"type": "array"
},
"marketplacePositioning": {
"type": "object"
},
"nextSteps": {
"items": {
"type": "string"
},
"type": "array"
},
"prices": {
"items": {
"type": "object"
},
"type": "array"
},
"score": {
"maximum": 100,
"minimum": 0,
"type": "integer"
},
"target": {
"type": "string"
}
},
"required": [
"target",
"score",
"issues",
"nextSteps"
],
"additionalProperties": true
}🟢probe_x402_paid_path(expected, method, mode, target)
Probe a public x402 paid endpoint without signing or paying, then parse the HTTP 402 challenge. Pass target plus optional expected network/asset/price to verify payment metadata and receive a deterministic health receipt.
Input Schema
{
"type": "object",
"properties": {
"expected": {
"additionalProperties": true,
"description": "Optional expected x402 metadata such as network, asset, and priceUsd.",
"properties": {
"asset": {
"type": "string"
},
"network": {
"type": "string"
},
"priceUsd": {
"type": "string"
}
},
"type": "object"
},
"method": {
"description": "Safe unpaid probe method. Defaults to GET.",
"enum": [
"GET",
"HEAD",
"OPTIONS"
],
"type": "string"
},
"mode": {
"description": "Probe mode for v1. Defaults to unpaid_402.",
"enum": [
"unpaid_402",
"metadata_only"
],
"type": "string"
},
"target": {
"description": "Specific paid endpoint URL to probe without payment.",
"type": "string"
}
},
"required": [
"target"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"checks": {
"type": "object"
},
"healthy": {
"type": "boolean"
},
"issues": {
"items": {
"type": "string"
},
"type": "array"
},
"observed": {
"type": "object"
},
"receipt": {
"type": "object"
},
"recommendedFixes": {
"items": {
"type": "string"
},
"type": "array"
},
"target": {
"type": "string"
}
},
"required": [
"target",
"healthy",
"checks",
"observed",
"issues",
"recommendedFixes",
"receipt"
],
"additionalProperties": true
}🟢check_agent_tool_readiness(expected, expected_resources, marketplace_url, method, paid_path, ...)
GateCheck readiness: check whether an x402/agent-facing tool is ready for agent routing, marketplace listing, and paid-path monitoring, including public agent discovery surfaces (/llms.txt, /agents.txt, /.well-known/mcp.json, /mcp). Pass target plus optional tier, marketplace_url, expected_resources, and paid_path; deep/report tiers add unpaid 402 probing when paid_path is supplied. Tiers: quick $1, deep $5, report $10.
Input Schema
{
"type": "object",
"properties": {
"expected": {
"additionalProperties": true,
"description": "Optional expected x402 network/asset/price metadata for paid_path probes.",
"type": "object"
},
"expected_resources": {
"description": "Optional expected resource count.",
"type": "integer"
},
"marketplace_url": {
"description": "Optional marketplace/listing URL to compare against public metadata.",
"type": "string"
},
"method": {
"description": "Safe unpaid probe method when paid_path is supplied. Defaults to GET.",
"enum": [
"GET",
"HEAD",
"OPTIONS"
],
"type": "string"
},
"paid_path": {
"description": "Optional specific paid endpoint to probe without payment for deep/report tiers.",
"type": "string"
},
"target": {
"description": "Target API/provider base URL to scan.",
"type": "string"
},
"tier": {
"description": "Readiness depth. quick=$1, deep=$5, report=$10. Defaults to quick.",
"enum": [
"quick",
"deep",
"report"
],
"type": "string"
}
},
"required": [
"target"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"checks": {
"type": "object"
},
"healthProbe": {
"type": [
"object",
"null"
]
},
"issues": {
"items": {
"type": "string"
},
"type": "array"
},
"priceUsd": {
"type": "string"
},
"product": {
"type": "string"
},
"ready": {
"type": "boolean"
},
"recommendedFixes": {
"items": {
"type": "string"
},
"type": "array"
},
"report": {
"type": "object"
},
"scan": {
"type": "object"
},
"score": {
"maximum": 100,
"minimum": 0,
"type": "integer"
},
"target": {
"type": "string"
},
"tier": {
"enum": [
"quick",
"deep",
"report"
],
"type": "string"
}
},
"required": [
"product",
"target",
"tier",
"priceUsd",
"ready",
"score",
"checks",
"issues",
"recommendedFixes"
],
"additionalProperties": true
}🟢generate_x402_launch_pack(audience, desired_marketplaces, expected, expected_resources, marketplace_url, ...)
Generate marketplace-safe launch assets for an x402/MCP seller: listing copy, buyer FAQ, checklist, approval packet, and claim boundaries. Pass target plus optional product_name, audience, primary_use_case, marketplace_url, and paid_path; service/premium tiers include readiness evidence. Tiers: single $9, service $29, premium $49.
Input Schema
{
"type": "object",
"properties": {
"audience": {
"description": "Primary buyer/audience for listing copy.",
"type": "string"
},
"desired_marketplaces": {
"description": "Optional marketplace names to include in launch planning.",
"items": {
"type": "string"
},
"type": "array"
},
"expected": {
"additionalProperties": true,
"description": "Optional expected x402 network/asset/price metadata for paid_path probes.",
"type": "object"
},
"expected_resources": {
"description": "Optional expected resource count.",
"type": "integer"
},
"marketplace_url": {
"description": "Optional marketplace/listing URL to compare against public metadata.",
"type": "string"
},
"method": {
"description": "Safe unpaid probe method when paid_path is supplied. Defaults to GET.",
"enum": [
"GET",
"HEAD",
"OPTIONS"
],
"type": "string"
},
"paid_path": {
"description": "Optional paid endpoint to validate via unpaid 402 challenge for service/premium packs.",
"type": "string"
},
"primary_use_case": {
"description": "Primary buyer outcome/use case.",
"type": "string"
},
"product_name": {
"description": "Buyer-facing product title.",
"type": "string"
},
"target": {
"description": "Target API/provider base URL to package for launch.",
"type": "string"
},
"tier": {
"description": "Launch pack depth. single=$9, service=$29, premium=$49. Defaults to single.",
"enum": [
"single",
"service",
"premium"
],
"type": "string"
}
},
"required": [
"target"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"approvalRequiredBeforeDistribution": {
"type": "boolean"
},
"claimBoundary": {
"type": "string"
},
"launchPack": {
"type": "object"
},
"priceUsd": {
"type": "string"
},
"product": {
"type": "string"
},
"productName": {
"type": "string"
},
"readiness": {
"type": "object"
},
"readinessScore": {
"maximum": 100,
"minimum": 0,
"type": "integer"
},
"readyForDistribution": {
"type": "boolean"
},
"report": {
"type": "object"
},
"target": {
"type": "string"
},
"tier": {
"enum": [
"single",
"service",
"premium"
],
"type": "string"
}
},
"required": [
"product",
"target",
"tier",
"priceUsd",
"productName",
"readinessScore",
"approvalRequiredBeforeDistribution",
"launchPack"
],
"additionalProperties": true
}🟢generate_trust_receipt(nextStep, payment, policy, request, result)
Generate a deterministic trust receipt from sanitized request/policy/result/payment summaries. Do not submit raw auth headers, cookies, API keys, private keys, payment signatures, payment response headers, customer prompts, customer documents, or payer-identifying evidence.
Input Schema
{
"type": "object",
"properties": {
"nextStep": {
"description": "Optional receipt next-step guidance.",
"type": "string"
},
"payment": {
"description": "Optional sanitized payment summary or caller-provided hashes only; do not include raw payment signatures, raw payment response headers, private keys, API keys, cookies, payer-identifying evidence, or wallet secrets.",
"type": "object"
},
"policy": {
"description": "Sanitized policy or decision summary to hash.",
"type": "object"
},
"request": {
"description": "Sanitized request/action summary to hash; omit raw prompts, documents, credentials, cookies, auth headers, signatures, and secrets.",
"type": "object"
},
"result": {
"description": "Sanitized outcome/result summary to hash; omit customer data and secret-like values.",
"type": "object"
}
},
"required": [
"request"
],
"additionalProperties": true
}Output Schema
{
"type": "object",
"properties": {
"claimBoundary": {
"type": "string"
},
"createdAt": {
"type": "string"
},
"decision": {
"type": "string"
},
"evidenceHash": {
"type": "string"
},
"marketplacePositioning": {
"type": "object"
},
"nextStep": {
"type": "string"
},
"receiptId": {
"type": "string"
}
},
"required": [
"receiptId",
"createdAt",
"decision",
"evidenceHash",
"claimBoundary"
],
"additionalProperties": true
}Community
Evidence
Recent observations
verifiedversion not recorded6 tools
verifiedversion not recorded6 tools
verifiedversion not recorded6 tools
verifiedversion not recorded6 tools
verifiedversion not recorded6 tools
verifiedversion not recorded6 tools