HTTP/1.1 402 PAYMENT REQUIRED agent402.base.eth · BASE · SOLANA · POLYGON · ARBITRUM · MONAD · CELO · AVALANCHE · SEI · OPTIMISM · STELLAR · ALGORAND · ROBINHOOD · USDC · USDG
$ GET /pricing

Two ways to pay.
No subscription, ever.

Pay in compute with a proof-of-work puzzle, or settle micro-amounts per call - USDC on Base, Solana, Polygon, Arbitrum, Monad, Celo, Avalanche, Sei, Optimism, Stellar, or Algorand - or USDG on Robinhood Chain. No card, no signup, no minimum, no monthly fee. The wallet is the identity.

FREE · PROOF-OF-WORK
$0.00 / call

Solve a short sha256 puzzle - a few seconds of CPU - instead of paying. No wallet at all.

✓ 223 pure-CPU tools
✓ No wallet, no funds, no account
✓ Hosted MCP connector runs these free
· Rate-limited; browser/GPU tools excluded
x402
PAID · USDC ON BASE
$0.001 / call & up

An x402 client signs USDC from the agent's own wallet and retries. Settles on Base in seconds.

✓ All 528 tools, including browser & memory
✓ Flat per-call price - pay exactly what you use
✓ Non-custodial - Agent402 never holds funds
✓ Spend caps refuse a runaway model before paying
// from-price by category

What each call costs.

Most tools - text, math, encoding, time, validation, convert$0.001
Agent memory - write, recall, grant, audit$0.002
Payments & x402 - decode, verify, settlefrom $0.002
Article extract - clean markdown out$0.010
Headless browser - render & screenshot (real Chromium)$0.02
live machine-readable prices: GET /api/pricing · GET /openapi.json
// POST /v1/*

The /v1 LLM gateway.

Point any OpenAI SDK at base_url https://agent402.tools/v1 - same wallet-is-the-identity model as every other tool, no API key, no signup. Omit the model on the auto tier and the gateway picks one for the prompt.

/v1/embeddings - default-on cache, free repeat$0.002
/v1/nano/chat/completions - high-frequency agent loops$0.003
/v1/auto/chat/completions - model optional, eval-ranked routing$0.01
/v1/chat/completions - budget/mid models$0.02
/v1/images/generations - one image per call$0.08
/v1/audio/speech - OpenAI TTS wire, mp3/pcm bytes out$0.06
/v1/pro/chat/completions - gpt-4o, claude sonnet, gemini pro$0.10
/v1/premium/chat/completions - gpt-5, o3/o4, claude opus$0.50
full wire format: /docs
WHY IT'S CHEAP

Beat the token math.

Writing, testing and debugging a CSV parser or cron calculator mid-task burns thousands of tokens - easily 10–100× the price of a tested $0.001 call. Reimplementation is the expensive path.

build it yourself~5,000 tokens
call the tested endpoint$0.001

Start on the free tier. No wallet.

QUICKSTART → BROWSE TOOLS