Shielded Nanopayments
for Autonomous AI Agents.
Public blockchains permanently expose every model call and trade secret your agents pay for. ArcNano enables private, OFAC-compliant, sub-cent micropayments with deterministic sub-second finality.
1M+ shielded notes active in Poseidon Vault
Why Existing Machine Payments Fail for AI Agents
Paying for autonomous compute and LLM tools with public blockchain transactions creates 4 fatal traps.
Trap 1: Public block explorers log every AI model call, prompt, and tool supplier.
Trap 1: Public block explorers log every AI model call, prompt, and tool supplier.
Public ledgers dox AI agents
Standard crypto payments permanently log every prompt, tool call, and model supplier to block explorers for competitors to copy.
Naive ZK still leaks the signer
Even with a ZK proof, if the agent signs the transaction on-chain, its wallet address is broadcast to every node in the network.
Mixers are blocked by enterprise APIs
Traditional mixers pool dirty and clean funds together, causing AI gateways, AWS, and Cloudflare to automatically blacklist them.
Block times & gas kill nanopayments
Waiting 10–15 seconds for a block stalls real-time agent loops, while gas fees cost 10x more than a $0.001 inference call.
How ArcNano Solves Every Trap
We architected ArcNano from first principles to decouple payments from identity, guarantee legal compliance, and deliver instant sub-second verification.
Receiver-Batched Settlement
In ArcNano, the spending agent never broadcasts an on-chain transaction. Instead, it generates a Groth16 proof locally in memory and embeds it in the X402 request header.
The client proves knowledge of a secret deposit note commitment without disclosing its nullifier or secret key.
The API receiver collects valid proofs and aggregates them into a single batchSpend() transaction broadcasted on Arc.
Pillar 1: Receiver-batched settlement completely eliminates msg.sender from the chain.
Pillar 1: Receiver-batched settlement completely eliminates msg.sender from the chain.
Arc Circle Gas Station Sponsorship
Normally, funding burner wallets with native gas tokens links them back to master accounts. ArcNano eliminates native gas through Circle Gas Station paymasters.
Settlement transactions on Arc are submitted via the Circle Gas Station (ERC-4337 Paymaster).
No native gas tokens are ever transferred to agent wallets, permanently closing the centralized exchange graph leak.
Pillar 2: Circle Gas Station sponsors 100% of native gas via ERC-4337 paymasters.
Pillar 2: Circle Gas Station sponsors 100% of native gas via ERC-4337 paymasters.
Association Set Provider Proofs
Inspired by the Privacy Pools standard, ArcNano uses dual Merkle membership circuits so legitimate agents prove clean origin without revealing their individual deposit leaf.
Enforces dual constraints: inclusion in the deposit Merkle tree, plus non-inclusion in the ASP sanctioned root.
Enterprise APIs verify compliance mathematically before fulfilling requests, remaining 100% compliant.
Pillar 3: Dual Merkle ASP circuits guarantee OFAC compliance without KYC.
Pillar 3: Dual Merkle ASP circuits guarantee OFAC compliance without KYC.
Two-Stage X402 Verification
We decouple high-frequency API responses from on-chain block mining times through an in-memory two-stage verification architecture.
Stage 1: Gateway executes in-memory Groth16 pairing check and Redis nullifier cache in < 10ms for instant responses.
Stage 2: Gateway queues spent nullifiers and settles 50–100 transactions together in periodic batches on Arc.
Pillar 4: Off-chain Groth16 pairings verify in under 10ms directly in API gateway RAM.
Pillar 4: Off-chain Groth16 pairings verify in under 10ms directly in API gateway RAM.
The 6-Step Autonomous A2A Payment Flow
Scroll smoothly to trace an end-to-end micro-transaction between two autonomous AI agents from HTTP 402 challenge to zero-gas settlement.
Agent A (Buyer)
Autonomous LLM
Agent B (Seller)
MCP Gateway
Groth16 Prover
Proves in agent RAM. Zero on-chain trace.
Verify & Stream
Instant pairing check in RAM before stream.
ArcNano Relayer
Batches proofs
Arc L1 Settle
Paymaster $0 Gas