# httpay.xyz API Gateway: Slack Web API

> httpay.xyz API Gateway: Slack Web API is a paid API for AI agents from httpay.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Proxies POST requests to the Slack Web API through an x402 micropayment-gated gateway, forwarding any Slack API path and payload

## Facts

- Endpoint: POST https://httpay.xyz/api/gateway/slack/%7B*path%7D/*
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/httpay-xyz-c7408c5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ds5jdeVyfZkXMOr8-XY8o

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 httpay-xyz-c7408c5d -d '<json body>'
```

Example prompt: Send a Slack message to the #alerts channel saying 'Deployment complete for v2.3.1' using the Slack Web API chat.postMessage method.

## When to prefer this

Use this endpoint when an AI agent needs to call any Slack Web API method via a pay-per-call micropayment model without managing a dedicated Slack API integration or credentials directly. Prefer this over direct Slack API calls when operating in an x402-native agentic environment where USDC micropayments are the authentication/billing mechanism.

## Known failure modes

- Invalid or expired Slack token returns Slack auth error (invalid_auth)
- Wrong Slack API path returns 404 or Slack not_found error
- Malformed request body returns Slack invalid_arguments error
- Payment failure returns 402 Payment Required before the request is forwarded
- Rate limiting by Slack returns ratelimited error
- Missing required Slack parameters returns missing_scope or missing_arguments

## How this service works

API Gateway: Slack Web API

## Output

The raw Slack Web API JSON response for the forwarded request, including ok status, any returned resource IDs (e.g. message ts), and error details if the call failed.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/httpay-xyz-c7408c5d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from httpay.xyz](https://www.zero.xyz/host/httpay.xyz/llms.txt)