# AgentReeve Preflight — x402 Endpoint Pre-Pay Probe

> AgentReeve Preflight — x402 Endpoint Pre-Pay Probe is a paid API for AI agents from agentreeve.com, paid per call via x402, $0.005/call, status down (last checked 2026-09-16).

Performs a live preflight check on an x402 endpoint before payment: verifies liveness, validates quote terms, confirms payment amount/asset/network, checks payTo address history, and reports 7-day uptime.

## Facts

- Endpoint: POST https://agentreeve.com/api/preflight
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentreeve-preflight-x402-endpoint-pre-pay-probe-6ca319f7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SR451Jkr3flPfqSFZa4W6

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 agentreeve-preflight-x402-endpoint-pre-pay-probe-6ca319f7 -d '<json body>'
```

Example prompt: Before I pay for this x402 endpoint at https://api.example.com/data, run a preflight check to confirm it's live, the quote terms are valid, the payTo address looks legitimate based on history, and the 7-day uptime is acceptable.

## When to prefer this

Use this endpoint whenever an AI agent is about to make a payment to an unknown or infrequently-used x402 API and wants to verify safety before committing funds. Prefer it over skipping preflight entirely when dealing with new providers, large payments, or automated pipelines where a broken endpoint would cause cascading failures. It is especially valuable for detecting payTo address drift (potential scam or hijack) and for confirming quote validity in strict x402 environments.

## Known failure modes

- Endpoint is unreachable — returns liveness failure with no further checks possible
- x402 quote is malformed or missing required fields — returns strict quote validity failure
- payTo address has no history or shows drift from previous observations — flagged as suspicious
- Network or asset mismatch detected between quote and expected parameters
- AgentReeve probe infrastructure temporarily unavailable — service error response

## How this service works

Preflight an x402 endpoint. Live probe before you pay: liveness, strict quote validity, exact amount/asset/network, payTo history match and 7-day uptime.

## Output

Returns a structured preflight report including: endpoint liveness (up/down), quote validity flag, exact required payment amount and asset, network confirmation, payTo address reputation/history match, and a 7-day uptime percentage — allowing an agent to decide whether to proceed with payment.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentreeve-preflight-x402-endpoint-pre-pay-probe-6ca319f7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentreeve.com](https://www.zero.xyz/host/agentreeve.com/llms.txt)