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AI tools / LLM API

Call any frontier model through one endpoint

One OpenAI- and Anthropic-compatible endpoint for every frontier model. Provider list price on tokens, no markup, no subscription, priced before the call runs.

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The call

One endpoint, priced in dollars before it runs and settled in USDC. No API key and no account — the request pays for itself.

POST /api/v1/chat/completions
Host: blockrun.ai

What it costs

modelprovprice
Nemotron 3 Nano Omni (Free)nvidiaFree / FreeNemotron 3.5 Lightning (Free)nvidiaFree / FreeNemotron 3 Nano 30B (Free)nvidiaFree / FreeLlama 3.2 11B Vision (Free)nvidiaFree / FreeNemotron 3 Ultra 550B (Free)nvidiaFree / FreeCohere North Mini Code (Free)cohereFree / FreePoolside Laguna XS 2.1 (Free)nvidiaFree / FreeQwen3.7 Flashqwen$0.03 / $0.13GPT-4.1 Nanoopenai$0.10 / $0.40Gemini 2.5 Flash Litegoogle$0.10 / $0.40
See the full catalog →

Why per call

No seat, no minimum, no contract per vendor. Each request is quoted in dollars before it runs and settles on-chain, so an agent can pay for its own work without a human holding a credit card. How the payment works →

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Questions

Do I need an API key?

No. Payment is the authentication — a request carries an x402 payment header and settles in USDC on Base or Solana.

Is it OpenAI-compatible?

Yes. Point an existing OpenAI or Anthropic SDK at the base URL and the first call works, with no migration.

What does a call cost?

The provider's published token rate with no markup, plus a flat per-call fee. Every request is quoted in dollars before it runs.

Can I try it without paying?

Yes. Several models are free and need no wallet at all.