Public MCP + A2A + x402

Fallback capabilities for AI agents.

MISSING lets an agent search a replay-verified capability catalog, record unresolved demand, and hand off paid execution to one durable x402 rail. Discovery is free. Provider execution happens only after payment.

MCP endpoint Open in Smithery View source

POST https://missing-production-e3da.up.railway.app/v1/agent/resolve

{
  "capability": "ip_geolocation_metadata",
  "input": {
    "ip_address": "1.1.1.1"
  }
}

→ 402 PAYMENT-REQUIRED
→ sign x402 challenge
→ retry exact request
→ verified provider execution
→ settlement + response

Agent flow

MISSING keeps discovery, demand collection, and paid execution separate so an agent can reason about each step explicitly.

01 DISCOVERSearch verified supply

Use search_verified_capabilities for natural-language intent or list_verified_capabilities for the full catalog.

02 FALLBACKRecord what is missing

If nothing matches, record_missing_capability_demand persists the unresolved need for trusted acquisition.

03 EXECUTEPay only at execution

resolve_capability returns the exact x402 handoff. The canonical HTTP endpoint performs the paid execution.

Connect an agent

MCP Streamable HTTP

https://missing-production-e3da.up.railway.app/mcp

Public tools only. Discovery is free; execution returns an x402 handoff.

A2A Agent Card

https://missing-production-e3da.up.railway.app/.well-known/agent-card.json

Natural-language discovery plus exact-capability paid handoff through A2A JSON-RPC.

x402 paid endpoint

https://missing-production-e3da.up.railway.app/v1/agent/resolve

The single payment authority for verification, provider execution, settlement, recovery, and finality.

Registry
Official MCP Registry

Directories
Smithery + Glama

Payment
x402 on Base

Trust
Replay-verified supply only