Deterministic model selection
which-llm API
Deterministic model selection with transparent tradeoffs
Transparent pricing
Pricing
Simple, transparent pricing. Pay only for what you use.
Decision Optimization
Get a recommended model based on your constraints
0.01 USDC
per_request
/decision/optimize
Payment methods
Payment Methods
Payments are made using USDC on supported blockchain networks: Ethereum (1), Optimism (10), Base (8453), Arbitrum One (42161), Avalanche C-Chain (43114)
  • Security Your wallet private key never leaves your device. Sign transactions locally, then provide only the transaction hash and payer address as payment proof. The API verifies payments on-chain.
  • Credits Report outcomes after execution to earn credit tokens that reduce the cost of future calls.
Protocol details
Technical Details
Paid endpoints use HTTP 402 payment gating with exact USDC payments. The API verifies transactions on-chain and uses a Durable Object ledger for replay protection.
View pricing JSON View capabilities JSON
Show full pricing JSON 
{
  "chain_namespace": "eip155",
  "chains": {
    "1": "Ethereum",
    "10": "Optimism",
    "8453": "Base",
    "42161": "Arbitrum One",
    "43114": "Avalanche C-Chain"
  },
  "currency": "USDC",
  "payment_asset": "USDC",
  "payment_scheme": "exact",
  "pricing": {
    "/decision/optimize": {
      "price": 0.01,
      "unit": "per_request"
    }
  }
}