Is this definitely a billing issue?

No, the "billing error" message is frequently a false positive triggered by unrelated text containing the number '402'. Always check your actual billing dashboards first, but then investigate the regex pattern.

How can I check my Anthropic or Grok credits?

Log into your respective provider dashboards (Anthropic console, xAI portal) to view your current credit balance and usage.

What if the fix doesn't work?

If refining the regex doesn't solve it, investigate API credentials for specific tools like `memory_search` (embeddings) or image generation. Also, test if the error occurs across different communication channels.

Fixing Intermittent API Provider Billing Errors in OpenClaw

TL;DR — Quick Fix

The 'API provider billing error' is often a false positive caused by overly broad regex matching; narrow the regex or check specific tool credentials.

Run Diagnostics

Next Step

Fix now, then reduce repeat incidents

If this issue keeps coming back, validate your setup in Doctor first, then harden your config.

Open Doctor Harden Config

Error Signal

⚠️ API provider returned a billing error — your API key has run out of credits or has an insufficient balance. Check your provider's billing dashboard and top up or switch to a different API key.

What's Happening

You're seeing a "⚠️ API provider returned a billing error..." message in Telegram, but your billing is fine. This error is misleading and, worse, sometimes prevents the agent's actual response from being delivered. Users have to re-send messages.

The Fix

The most common cause is a broad regex pattern (/402/) in ERROR_PATTERNS.billing incorrectly flagging non-billing messages. The confirmed fix involves narrowing this regex to only match actual HTTP 402 error contexts.

Update your ERROR_PATTERNS.billing with this stricter pattern:

/(?:status|code|http|error)\s*[:=]?\s*402\b|^\s*402\s+payment/i

This change specifically targets lines containing '402' in an HTTP error context.

Why This Occurs

1. Broad Regex Matching: The old regex was too simple and would match the number '402' anywhere in the API response text, even if it wasn't a payment error. This is likely what's happening in your case with Claude Max 20x.

2. Tool-Specific Credentials: Catwalksophie reported a similar issue caused by missing or invalid API credentials for specific tools, like the embeddings API for memory_search or image generation tools, not the main LLM provider. Check your credentials for any non-LLM tools.

3. Context Limit Artifacts: When nearing the context limit (like your 100% context), compaction errors or data truncation could potentially create false positives that trigger the broad regex.

4. Delivery Issues (Signal): One user noted the error appeared on Signal, but the response was generated correctly on the OpenClaw web interface. This suggests a channel-specific delivery problem rather than a true API error.

Prevention

Refine Error Patterns: Keep your ERROR_PATTERNS configuration precise to avoid false positives.
Validate Tool Credentials: Regularly check API keys and billing for all integrated services (embeddings, search, image generation, etc.).
Monitor Context Usage: Be mindful of sessions nearing context limits; consider clearing context or shortening conversations.
Test Channel Delivery: If issues persist, test response delivery on different channels (e.g., web UI vs. Telegram/Signal) to isolate the problem.

Last Updated: March 2026

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