Obul Proxy (x402)

USE THIS SKILL WHEN: the user wants to proxy a request through Obul, call an x402 API directly, or needs to understand the Obul proxy URL pattern. Handles x402 payment negotiation automatically.

Obul Proxy

Proxy any upstream request through Obul; Obul handles x402 discovery and payment flow automatically.

Authentication

All requests route through the Obul proxy. Include your Obul API key in every request:

json

{
  "headers": {
    "Content-Type": "application/json",
    "x-obul-api-key": "{{OBUL_API_KEY}}"
  }
}

Base URL: https://proxy.obul.ai/proxy/{scheme}/{host}

Common Operations

Health Check

Verify the Obul proxy is operational.

Pricing: $0.00

json

{
  "method": "GET",
  "url": "https://proxy.obul.ai/healthz",
  "headers": {
    "Content-Type": "application/json",
    "x-obul-api-key": "{{OBUL_API_KEY}}"
  }
}

Response: Returns {"status":"ok"} when the proxy is healthy.

Proxy a Request

Forward any HTTP request through the Obul proxy. The proxy handles x402 payment negotiation automatically.

Pricing: Varies based on upstream endpoint

json

{
  "method": "POST",
  "url": "https://proxy.obul.ai/proxy/https/x402.browserbase.com/browser/session/create",
  "headers": {
    "Content-Type": "application/json",
    "x-obul-api-key": "{{OBUL_API_KEY}}"
  },
  "body": {}
}

Response: The proxied response from the upstream x402 endpoint.

Endpoint Pricing Reference

Endpoint	Price	Purpose
GET /healthz	$0.00	Health check
/*	Varies	Proxy any upstream x402 request

When to Use

• Calling x402 endpoints — Route any x402-enabled API call through Obul without handling payments manually.
• Unified API access — Use a single Obul API key to access multiple x402-enabled services.
• Automatic payment handling — Let Obul negotiate and process payments for per-request micropayments.

Best Practices

• Never reveal your API key — Keep OBUL_API_KEY secure and never expose it in logs or client-side code.
• Use environment variables — Store your API key in OBUL_API_KEY env var and reference {{OBUL_API_KEY}} in requests.
• Check health before use — Verify the proxy is operational with /healthz if you encounter issues.

Error Handling

Error	Cause	Solution
401 Unauthorized	Missing or invalid API key	Verify OBUL_API_KEY is set and valid.
402 Payment Required	Upstream requires payment	Ensure your Obul account has sufficient balance.
403 Forbidden	API key lacks permissions	Check your key has the required scopes.
404 Not Found	Invalid upstream URL	Verify the upstream endpoint URL is correct.
429 Too Many Requests	Rate limit exceeded	Add a short delay between requests.
500 Internal Server Error	Obul proxy issue	Retry the request. If persistent, check status at https://proxy.obul.ai/healthz.
503 Service Unavailable	Proxy temporarily down	Wait a few seconds and retry.