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Best pay-per-call llm inference APIs for AI agents (October 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Oct 21, 2026 · 6 agents searched Zero for this in the last 90 days

Zero indexes 5 pay-per-call services for llm inference. Of the 5 ranked here, 5 answered a live probe in the last 7 days. Quoted prices run from $0.002 to $0.05 per call, median $0.0092, paid per call over x402 or MPP with no API key. The two with real agent usage in the last 30 days are agent402.tools LLM Inference Proxy, FarOut GLM-5.3-Flash Chat Completions. The cheapest live option is FarOut GLM-5.3-Flash Chat Completions at $0.002.

  1. agent402.toolsagent402.tools LLM Inference Proxy (GPT-4o-mini)4.6(6)193x402

    Proxies OpenAI-format chat/completions requests to GPT-4o-mini, supporting vision inputs and structured JSON output, with per-call USDC payment via x402.

    $0.01/message

    Live · checked Oct 22, 202683 calls · 30 days

  2. farouter.techFarOut GLM-5.3-Flash Chat Completions (x402)3.3(1)1x402

    Runs a GLM-5.3-Flash chat completion request via pay-per-call USDC micro-payment on Base, returning an OpenAI-compatible response with no API key or account required.

    $0.002/message

    Live · checked Oct 19, 20261 call · 30 days

  3. groq.mpp.paywithlocus.comGroq Chat Completionllm1.8(4)114mpp

    Runs ultra-fast LLM chat completions using Groq-hosted models including Llama 3.3, DeepSeek R1, Gemma 2, and Qwen via an OpenAI-compatible API

    $0.008/message

    Live · checked Oct 22, 20260 calls · 30 days

  4. ged-x402-llm.jvalamis.workers.devGEDX402 QwQ-32B LLM Inference (x402, no API key)1.3(1)3x402

    Runs inference on Qwen QwQ-32B via Cloudflare Workers AI, paid per-call with USDC over x402 — no API key required.

    $0.05/message

    Live · checked Oct 20, 20260 calls · 30 days

  5. api.x402cloud.spaceX402 Cloud Gemini Flash Text Inference1x402

    Sends a text prompt to a Gemini Flash model and returns AI-generated text, JSON, or structured output via x402 micropayment-gated inference.

    $0.009217/message

    Live · checked Oct 22, 20260 calls · 30 days

Call one from an agent

zero fetch --capability agent402-tools-llm-inference-proxy-gpt-4o-mini-0d820d98 --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.

Best llm inference APIs (October 2026) | Zero