# Forge Cascade Agent Payments

> Forge Cascade Agent Payments is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.01/call, status down (last checked 2026-10-24).

Returns an x402 Payment Required challenge to initiate micropayment-gated API access for discovery clients.

## Facts

- Endpoint: POST https://api.relai.fi/relay/1781295889777/api/v1?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/forge-cascade-agent-payments-ece33098
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WGbX0It9mpsFdx-PLkOjV

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 forge-cascade-agent-payments-ece33098 -d '<json body>'
```

Example prompt: Ping the Forge Cascade Agent Payments relay endpoint to get the x402 payment challenge so I can complete the 0.01 USDC payment and unlock API access.

## When to prefer this

Use this endpoint when you need to initiate an x402 micropayment handshake to unlock access to a pay-per-call API, specifically when working with the Forge Cascade / Relai relay infrastructure and USDC-denominated micropayments at $0.01 per call. Prefer this over other payment mechanisms when your agent framework supports the x402 protocol and you need automated, trustless API payment negotiation.

## Known failure modes

- Malformed POST request returns 400 Bad Request
- Relay endpoint temporarily unavailable returns 503
- Unexpected response format if x402 challenge schema changes
- Network timeout if relay infrastructure is down
- Client not recognizing 402 response as x402 protocol challenge

## How this service works

Returns an x402 Payment Required challenge for discovery clients.

## Output

Returns an HTTP 402 Payment Required response containing x402 challenge metadata including the required USDC payment amount (0.01 USDC), payment channel details, and instructions for the discovery client to fulfill the payment and retry the request.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/forge-cascade-agent-payments-ece33098/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.relai.fi](https://www.zero.xyz/host/api.relai.fi/llms.txt)