# agenteconomy.cloud x402 Endpoint Verifier

> agenteconomy.cloud x402 Endpoint Verifier is a paid API for AI agents from mcp.agenteconomy.cloud, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).

Performs a full end-to-end paid test of an x402-payment endpoint, verifying quote, 402 requirements, payment settlement, and content delivery, then returns a signed verdict of what passed or failed.

## Facts

- Endpoint: POST https://mcp.agenteconomy.cloud/api/v1/check
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agenteconomy-cloud-x402-endpoint-verifier-9bbd111a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rhD3IaQ6YTUkFspPqncqx

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agenteconomy-cloud-x402-endpoint-verifier-9bbd111a -d '<json body>'
```

Example prompt: Before I wire up my agent to pay this x402 endpoint at https://api.someservice.com/data, can you do a full live probe — real capped purchase and all — and tell me if it actually delivers, whether the payTo address matches 0xABC123, and exactly which steps pass or fail?

## When to prefer this

Use this endpoint when you need to validate that a real x402 payment endpoint works end-to-end before integrating it into an agent workflow, or when auditing a marketplace listing for correctness. Unlike static linting tools that stop before money moves, this service executes a real capped probe purchase and reports on every stage of the payment and delivery cycle. Prefer it when payTo address verification, settlement confirmation, or delivery proof is required, especially when a listing's behavior is suspected to deviate from its advertised spec.

## Known failure modes

- Target endpoint is unreachable or returns non-402 errors — verdict reports phantom endpoint finding
- x402 endpoint loops on 402 responses without settling — named as 402-again loop finding
- payTo address in response does not match expected_payto — reported as payTo mismatch finding
- Malformed accept headers on the endpoint prevent payment negotiation — reported as malformed accepts finding
- Listing ID not found in catalog — listing comparison step skipped or error returned
- Probe payment cap exceeded or USDC balance insufficient to complete the test purchase

## How this service works

Does this x402 seller actually deliver when paid? We test the full flow as a real buyer: quote, 402 requirements validation, a real capped probe purchase, settlement and delivery — not a lint that stops before money moves. The signed verdict states exactly which steps ran and what failed: 402-again loops, wrong payTo, malformed accepts, phantom endpoints. agenteconomy.cloud (mcp-pricing-v1.1)

## Output

A signed verdict document indicating which steps of the x402 payment flow ran successfully (quote, 402 requirements validation, probe payment, settlement, delivery) and a named list of any failures such as 402-again loops, wrong payTo address, malformed accept headers, or phantom/unreachable endpoints.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "endpoint": {
   "type": "string",
   "maxLength": 500,
   "description": "https:// resource URL whose x402 payment machinery to test"
  },
  "listing_id": {
   "type": "string",
   "description": "optional catalog listing id — compares the advertised payTo against the cataloged seller"
  },
  "expected_payto": {
   "type": "string",
   "description": "optional 0x… address you expect the endpoint to charge to; mismatch is a named finding"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agenteconomy-cloud-x402-endpoint-verifier-9bbd111a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp.agenteconomy.cloud](https://www.zero.xyz/host/mcp.agenteconomy.cloud/llms.txt)