Retail Payments

Single-Chain USDC Transfer

The simplest stablecoin payment — USDC from one wallet to another on a single chain.

Vendors

Circle · Wallet Providers

Compliance center

Wallet KYC at Identity

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R1 · RETAILSingle-chain USDC payment·2 stations(0 compliance, 2 infra)·coinbase
S1INTENTS2S3DISCOVERYS4S5S6S7S801Smart Wallet02Smart Wallet
3+5 shape system
GatePre-condition — blocks if it failsMonitorConcurrent — observes without haltingObligationPost-settlement — reports after the factsolid = codedashed = policy
How to read this diagram
Each station on the rail represents a compliance or infrastructure event in the Single-chain USDC payment path. Hover any station to inspect it. The shape tells you what kind of event it is. The ring tells you how it's enforced.
Gate Monitor Obligation| Ingress Crossing Transform Settlement Venue
This path at a glance
2 stations across 2 of 8 segments. 0 are compliance checkpoints, 2 are infrastructure.
1 code-enforced1 policy-enforced
R1 · SINGLE-CHAIN USDC PAYMENT · BASE
00
Mandate
01
Intent
02
Identity
03
Discovery
04
Negotiation
05
Transport
06
Authorization
07
Facilitation
08
Finality
09
Disposition
L5 APPLICATIONL4 ACCOUNTL3 EXECUTIONL2 CONSENSUSL1 NETWORKBASE
L5 APPLICATIONWALLET
L4 ACCOUNTWALLET

Step 1 · Payer Wallet (Base)Policy-Enforced

"The payer's bank app — identity verified, balance confirmed, payment instruction ready."

Self-custody smart account on Base. The simplest possible path: payer initiates a single-chain USDC transfer. L4 Account (balance, signing keys) and L5 Application (wallet UX, consent) are lit above the enforcement line.

Counterparty
Self (payer holds keys)
Latency
Instant · no on-chain tx yet
Finality
N/A — payment not yet submitted
Vendors
Coinbase Wallet · Coinbase Smart Wallet (ERC-4337 account abstraction — passkey-based onboarding) · EOA + ERC-4337 Smart Account (Coinbase Smart Wallet is the canonical Coinbase-operated AA surface) · Coinbase Custody Trust Company, LLC (New York limited-purpose trust company under NYDFS) · Coinbase Prime brokerage (institutional custody + execution surface) · third-party qualified custodians per integrator (Anchorage · BitGo · Fireblocks) · Securitize LLC (SEC-registered transfer agent; runs Reg D 506(c)(2)(ii) accredited-investor verification workflow; transfer-agent function is off-chain, identical on Base and Ethereum) · Coinbase Paymaster (gas-sponsorship primitive for Coinbase Smart Wallet flows · ERC-4337 paymaster contract) · Coinbase Verifications (Ethereum Attestation Service-backed attestation product binding Coinbase-verified identity attributes — country of residence, accredited-investor status, etc. — to addresses) · Securitize Markets ATS (SEC-registered ATS) · BlackRock BUIDL · other Securitize-issued RWAs (Base deployments via multichain expansion — ACRED was Ethereum-mainnet and Base availability is NOT independently confirmed)
Chain
Base (Coinbase (sole sequencer operator at launch; decentralization on roadmap))
L5 APPLICATIONL4 ACCOUNTL3 EXECUTIONL2 CONSENSUSL1 NETWORKBASE
L5 APPLICATIONWALLET
L4 ACCOUNTWALLET
◆ Enforcement Line — code-enforced at this layer

Step 2 · Payee Wallet (Base)Code-Enforced

"The beneficiary's credit-to-account — funds arrive and the payment is final."

USDC arrives at the payee's wallet on Base in a single ERC-20 transfer. Same two-layer silhouette as Step 1 — L4 Account and L5 Application lit, above the enforcement line. The entire path executes in a single block.

Counterparty
Payee wallet (smart account or EOA)
Latency
~2s · single Base block
Finality
Final on Base block confirmation
Vendors
Coinbase Wallet · Coinbase Smart Wallet (ERC-4337 account abstraction — passkey-based onboarding) · EOA + ERC-4337 Smart Account (Coinbase Smart Wallet is the canonical Coinbase-operated AA surface) · Coinbase Custody Trust Company, LLC (New York limited-purpose trust company under NYDFS) · Coinbase Prime brokerage (institutional custody + execution surface) · third-party qualified custodians per integrator (Anchorage · BitGo · Fireblocks) · Securitize LLC (SEC-registered transfer agent; runs Reg D 506(c)(2)(ii) accredited-investor verification workflow; transfer-agent function is off-chain, identical on Base and Ethereum) · Coinbase Paymaster (gas-sponsorship primitive for Coinbase Smart Wallet flows · ERC-4337 paymaster contract) · Coinbase Verifications (Ethereum Attestation Service-backed attestation product binding Coinbase-verified identity attributes — country of residence, accredited-investor status, etc. — to addresses) · Securitize Markets ATS (SEC-registered ATS) · BlackRock BUIDL · other Securitize-issued RWAs (Base deployments via multichain expansion — ACRED was Ethereum-mainnet and Base availability is NOT independently confirmed)
Chain
Base (Coinbase (sole sequencer operator at launch; decentralization on roadmap))

Resolved 2 steps across 1 chain(s). 0 threshold(s) triggered. Frameworks: Common Reporting Standard / FATCA.

Coverage notes: 5 disclosed gap(s).
TOOL 01 · ON-CHAIN OFAC SDN QUERY

Chainalysis Sanctions Checker

Query the Chainalysis OFAC sanctions oracle smart contract — code-enforced, free, public, read-only compliance check.

Chainalysis

Other Retail Payments Paths

R2 Cross-Chain CCTP Transfer Circle · CCTP
R3 Visa+Stablecoin Card Payment Visa · Coinbase Card
R4 P2P Wallet Transfer Self-Custodial Wallets
R5 Cross-Border Remittance Stellar · MoneyGram
R6 Merchant POS Stablecoin Accept Coinbase Commerce · BitPay
SETTLEMENT CHAINS
Base
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