Pay per request in USDC on Base. No account. No API key. No subscription.
01 / 10
The problem
AI is paid like it's 1999.
Subscriptions charge for months you don't use. Credit cards and billing cycles can't be operated by software. The same model costs different amounts from different sellers, changing by the hour, so everyone overpays.
02 / 10
The shift
Agents will make billions of calls a day.
Each one needs a micro-payment settled in seconds, without a human in the loop. The machine economy can't wait for invoices.
03 / 10
The product
Call. Sign. Stream.
01
Call the API
OpenAI-compatible endpoint. The first response is HTTP 402 with the exact price.
02
Sign USDC on Base
Your wallet signs an EIP-3009 transfer. No approve-and-pull, no unlimited spend.
03
Model streams back
Settled on-chain, then the answer. Routed to whichever model is cheapest right now.
04 / 10
Live today, not a roadmap
Real settlements on Base.
Router spread
5% over live cheapest
Flat markup, disclosed before you sign. One cent floor.
Verified speed
~100 output TPS
Published benchmarks, live health board, TTFT/TPS/F1000 metrics feed.
Market coverage
150+ models, 18 combos
Chat, coding, reasoning, fast, vision. Route by your own lens.
Free tier
Treasury sponsored
surp/free and surp/free-coding work with no wallet at all.
05 / 10
The moat
The cache auction.
A repeated question costs almost nothing to serve. So surp prices it at 0.1 cents, runs the cache as a second-price auction, and pays the people whose cached answers get reused. The more popular a question, the cheaper it gets for everyone. Everyone else gets slower and pricier at scale. Ours inverts.
06 / 10
The model
Revenue tracks machine usage, not seats.
Per request
USDC micro-payments
Settled on Base in seconds, hard per-generation charging.
Per answer
0.1¢ cache hits
Second-price auction on the exact-response cache.
Per user
API keys + budgets
Wallet dashboard, spend limits, usage graphs.
Token
$SURP on Base
Reward ledger for cache writers. Community vote to deploy is live.
07 / 10
Why Base
Everything that touches money lives on Base.
Every x402 settlement settles on Base. The $SURP contract will deploy on Base. Micro-payments only make sense where fees are near zero, and that's Base. surp is onchain payments infrastructure for AI.
08 / 10
Why BEF
The fund for the next financial system.
BEF backs onchain infrastructure and believes global finance is the killer use case for blockchains. The machine economy is the next frontier of that: billions of agent calls, each a USDC payment on Base. surp is the rail that makes it cheap enough to happen. Shipped, settling, and community-governed.