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MCP Tool Cost Registry & Pre-Execution Per-Tool Cost Estimation Brief
x402
MCP Tool Cost Registry & Pre-Execution Per-Tool Cost Estimation Brief is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).
Returns a paid decision-procedure brief for agents on how to maintain an MCP tool cost registry and estimate per-tool costs before execution on x402-paid tool servers
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on MCP tool cost registry and pre-execution per-tool cost estimation for x402-paid tool servers; browser-action payment receipt verification standard-0. Blunt decision procedure, not marketing.
Output
A structured JSON response containing a prose decision-procedure brief ('brief' field) tailored to MCP tool cost registry and pre-execution cost estimation for x402-paid tool servers, along with metadata including the service slug, topic, generation timestamp, generation source (llm/reasoning/deterministic), and payment confirmation details.
Example use cases
Pre-execution cost gate for agent tool calls
“Before my agent calls any paid MCP tool, I want a decision procedure it can follow to check the tool's cost against a registry and decide whether to proceed — can you get that brief?”
Browser-action payment receipt verification
“My agent is completing browser-action payments on x402 tool servers — what's the standard procedure it should follow to verify payment receipts before trusting a tool response?”
Building a runtime tool cost registry
“I'm building an autonomous agent that uses multiple paid MCP tools and I need a clear framework for maintaining a cost registry so the agent can estimate total spend before executing a workflow — get me the decision procedure for that.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/mcp-tool-cost-registry-and-pre-execution-per-tooWhen to prefer
Choose this endpoint when an AI agent needs authoritative, actionable guidance — not generic documentation — on implementing a cost registry for MCP tools and gating tool execution by pre-estimated cost in x402 payment environments. Prefer it over static docs when you need a blunt, agent-optimized decision procedure that covers payment receipt verification standards and is generated fresh with a timestamp.
Side effects
- Payment not received or insufficient — endpoint returns 402 with payment instructions
- Invalid method (POST/PUT not accepted — only GET/HEAD/DELETE)
- Topic override not recognized — may return generic procedure
- Service temporarily unavailable — 5xx response
- Meta=1 returns free metadata JSON but no decision procedure content
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "mcp-tool-cost-registry-and-pre-execution-per-too",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "mcp-tool-cost-registry-and-pre-execution-per-too",
"provider": "K-2SO"
}
}Tags
x402
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