# Synthex Forge x402 Uptime Verification

> Synthex Forge x402 Uptime Verification is a paid API for AI agents from x402.synthexforge.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-23).

Performs a paid cryptographically-signed uptime/availability verification check for a given service URL, returning an attestation artifact signed with Ed25519

## Facts

- Endpoint: POST https://x402.synthexforge.com/v1/mcp/verify/uptime?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthex-forge-x402-uptime-verification-5a9ba0a1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Gy8XJC__71C-zMbYYc4xe

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 synthex-forge-x402-uptime-verification-5a9ba0a1 -d '<json body>'
```

Example prompt: Check the uptime and availability of https://api.myservice.com and give me a cryptographically signed attestation — I need the Ed25519-verified proof of whether it passed, and my last settlement transaction was 0xabc123.

## When to prefer this

Choose this endpoint when you need a cryptographically signed, blockchain-payment-backed attestation of service uptime — not just a simple ping or health check. Ideal for compliance, governance, or audit scenarios where tamper-evident proof of availability is required and you can pay $0.25 USDC per verification on Base mainnet.

## Known failure modes

- Payment not received or x402 payment envelope invalid — returns HTTP 402 with payment-required details
- Service URL is unreachable or malformed — verification may return ok: false
- Invalid or missing last_confirmed_settlement_tx — may reject or fail attestation linkage
- Checks array malformed or unsupported check types — validation error
- Underlying network issues prevent reaching the target service URL

## How this service works

Synthex Forge x402 Receive: 41 paid verification, attestation and governance endpoints (Ed25519 + SHA-256 signed artifacts) plus free verify/public-key/standard sibling routes. Paid routes answer HTTP 402 with an x402 v2 `payment-required` envelope (atomic USDC on Base mainnet, chain ID 8453). Free routes are declared with `security: []` per the x402scan discovery spec.

## Output

Returns a JSON object with an 'ok' boolean indicating whether the service passed the uptime/availability verification, along with a cryptographically signed attestation artifact using Ed25519 + SHA-256, suitable for governance, compliance, or audit purposes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "checks": {
   "type": "array"
  },
  "service_url": {
   "type": "string"
  },
  "last_confirmed_settlement_tx": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthex-forge-x402-uptime-verification-5a9ba0a1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.synthexforge.com](https://www.zero.xyz/host/x402.synthexforge.com/llms.txt)