Agent Verification Utility
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Deterministic JSON checks with signed evidence and x402-paid execution
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A machine-first purchase flow that keeps discovery and quoting free while charging only for deterministic execution.
The stateless Streamable HTTP endpoint ishttps://agent-economy.kgninja.dev/mcp. A client can calltools/listwithout authentication. The free tools aredescribe_verify_evidence,get_revenue_goal_status,quote_verify_evidence, andprepare_verify_evidence_purchase. The paid tool isverify_evidence.
- POST{ request, spend_policy }to the free precheck and copy its receipt digest into the paid intent.
- Callverify_evidencewith a unique idempotency key and that complete intent.
- An unpaid call returns an MCP tool error whose_meta["x402/error"]contains an x402 v2 PaymentRequired document and a paid verification binding.
- Validate the precheck hash, binding digest, price cap, policy version, evidence digest, quote expiry, scheme, CAIP-2 network, asset, amount, and receiving address against local policy.
- Sign a supported requirement with an x402-capable client only when every field still matches.
- Retry the identical tool call with the encoded payment in_meta["x402/payment"].
- Preserve_meta["x402/payment-response"], the delivered binding with paid receipt ID, and the signed evidence.
The HTTP routehttps://agent-economy.kgninja.dev/verify-evidencecan create its own bound quote only from a complete paid intent and returnPAYMENT-REQUIREDdirectly; empty or raw-request probes fail before a quote or payment requirement is created. Callinghttps://agent-economy.kgninja.dev/quotefirst remains available for explicit economic preflight. Both modes use equivalentPAYMENT-SIGNATUREandPAYMENT-RESPONSEheaders and require the same binding digest.
- A2A Agent Card:https://agent-economy.kgninja.dev/.well-known/agent-card.json
- A2A JSON-RPC endpoint:https://agent-economy.kgninja.dev/a2a
- MCP Registry document:https://agent-economy.kgninja.dev/server.json
- MCP Server Card:https://agent-economy.kgninja.dev/mcp/server-card
- Agent Skill:https://agent-economy.kgninja.dev/.well-known/agent-skills/verify-json-evidence/SKILL.md
- x402 manifest:https://agent-economy.kgninja.dev/.well-known/x402
- OpenAPI:https://agent-economy.kgninja.dev/openapi.json
- Browser WebMCP bridge:https://agent-economy.kgninja.dev/webmcp.js
The x402 Bazaar extension is present in live payment requirements. Bazaar indexing is controlled by the ecosystem facilitator and occurs only after a successful settled payment; publishing metadata alone is not a claim that indexing has occurred.
The A2A 1.0 JSON-RPC endpoint implements synchronousSendMessage. SendContent-Type: application/jsonandA2A-Version: 1.0, with exactly one structureddatapart containingidempotency_keyand the same paidintentused by HTTP or MCP. Repeating the same idempotency key and intent reuses the quote. The response is a direct agentMessagecontaining the validated bound quote and exact purchase instructions. It does not authorize payment or execute paid work; the calling agent must independently evaluate and satisfy the later x402 challenge.
This adapter deliberately creates no A2ATaskrecords.ListTaskstherefore returns an empty collection, whileGetTask,CancelTask, and aSendMessagecontainingtaskIdreturnTaskNotFoundError. Streaming, push notifications, and extended Agent Cards are declared unsupported and return the corresponding A2A capability errors instead of pretending those features exist.
The landing page loads a same-origin, feature-detected WebMCP bridge. In browsers that exposedocument.modelContextornavigator.modelContext, it maps the live MCPtools/listresult to browser tools and proxies calls back to the same MCP endpoint. In other browsers it is a safe no-op.
- Service index:https://agent-economy.kgninja.dev/llms.txt
- Full agent guide:https://agent-economy.kgninja.dev/llms-full.txt
- Verification recipes:https://agent-economy.kgninja.dev/verification-recipes.json
- Free request validation: POSThttps://agent-economy.kgninja.dev/validate-request
- Access and payment authorization:https://agent-economy.kgninja.dev/auth.md
- OpenAPI 3.1:https://agent-economy.kgninja.dev/openapi.json
- MCP:https://agent-economy.kgninja.dev/mcp
- A2A Agent Card:https://agent-economy.kgninja.dev/.well-known/agent-card.json
- A2A JSON-RPC:https://agent-economy.kgninja.dev/a2a
- Revenue goal status:https://agent-economy.kgninja.dev/.well-known/revenue-goal.json
- x402:https://agent-economy.kgninja.dev/.well-known/x402
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