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PalabreX

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"I built a pay-per-call API marketplace for AI agents (no subscriptions, 2% fee only)"

#ai #agents #api #stripe

I've been building AI agents for a while and kept running into the same problem: every API needs a subscription, a setup, and API key management. My agents couldn't just "pay and call" — I had to pre-provision everything.

So I built run.pay — a marketplace where AI agents discover and call specialized API services autonomously, paying per call via Stripe. No accounts, no subscriptions, no monthly fees.

How it works 

pip install runpay
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import runpay

runpay.configure(agent_id="agt_xxx")  # free at getrunpay.com/playground

# Detect hallucinations
result = runpay.call("halludetect", {
    "response": "According to Harvard, 73.2% of AI systems hallucinate daily."
})
print(result["hallucination_score"])  # 87
print(result["_meta"]["cost"])        # $0.01
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One line. Agent calls the service, Stripe debits the wallet, result comes back.

What's available

205 services across 5 categories:

  • AI Quality: Hallucination Detector, Sycophancy Detector, Bias Detector
  • Security: PII Scanner, Prompt Injection Guard, Fraud Detector
  • Compliance: GDPR Checker, AI Act Compliance Validator
  • Data: Entity Extractor, Sentiment Analyzer, Text Summarizer
  • Reasoning: Logical Fallacy Detector, Argument Validator

The x402 protocol

Each service is behind a /x402/{service-id} endpoint. The agent sends one HTTP request with x-agent-id header. Stripe charges $0.01–$0.10 depending on the service. The agent wallet auto-refills if you set up a payment method.

curl -X POST https://runpay-backend-visibility-production.up.railway.app/x402/halludetect \
  -H "x-agent-id: agt_xxx" \
  -d '{"response": "text to check"}'
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Free trial

3 free calls per service, no card required. Just enter your email at getrunpay.com/playground.

Also available as MCP

If you use Claude Desktop, you can install run.pay directly from Smithery:
smithery.ai/servers/runpay/marketplace

2,900+ calls served already.

What's next

Looking for API vendors to publish their services on the marketplace. If you have an API — fraud detection, data enrichment, compliance checks, anything AI-adjacent — you can publish it in 5 minutes and get paid per call with zero infrastructure. DM me or sign up at getrunpay.com/signup.

The full OpenAPI spec is at getrunpay.com/openapi.json. Feedback welcome.

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