Protocol v0.4 · MCP-compatible · Solana mainnet

The transaction layer
for the agentic economy.

BlkbxPay is an MCP-compatible commerce execution protocol for autonomous AI agents. Discover merchants, access inventory, execute payment, settle on-chain — through a single machine-native interface.

Read the docs → Get early access
Interface
MCP · REST · gRPC
Settlement
Solana stablecoin
Finality
< 1 second
Status
Private beta
01 · The shift

Every commerce system alive today
was built for humans.

Browsing, clicking, reconciling. The actors are changing. The infrastructure hasn't.

Human-operated commerce

01 Open browser
02 Search merchant
03 Browse inventory
04 Add to cart
05 OAuth checkout
06 Manual reconciliation

Machine-operated commerce

01 agent.intent(...)
02 mcp.discover()
03 inventory.query()
04 cart.construct()
05 tx.execute()
06 state.sync()
02 · How money flows

One execute(). Six primitives. Sub-second credit.

Intent enters the engine, primitives fire in order, USDC settles to the merchant — a single round-trip, no UI in the middle.

01
AI AGENT · REQUEST
tx_4f3a2c · intent
02
SUPPLY · NEGOTIATE
mch_8f3a2c · SLA 99.99
03
CART · ASSEMBLED
USDC 142.50 · 2 items
04
BLOCKCHAIN · VERIFY
solana · block 287,432,184
05
INSTANT · CLEARED
settled · 0.83s
06
PURCHASE · COMPLETE
USDC 142.50 credited
03 · Protocol primitives

Six primitives. One protocol.

BlkBxPay decomposes commerce into machine-callable operations. Agents compose them; the protocol handles the rest.

01
Merchant Discovery
Machine-readable merchant registry. Agents resolve sellers by capability, geography, and SLA.
GET /v1/merchants?cap=ship_us
02
Inventory Access
Structured product graphs with availability, pricing, and substitutable SKUs in real time.
QUERY inventory.lookup(sku)
03
Cart Construction
Programmatic cart objects with line items, taxes, fees, and merchant-side validation built in.
POST /v1/carts
04
Payment Execution
Single atomic call. Authorization, capture, and merchant credit settle on stablecoin rails.
POST /v1/tx/execute
05
Real-Time Settlement
Sub-second finality on Solana. Deterministic on-chain confirmation, no batch windows.
WS tx.settled
06
State Synchronization
Bi-directional state feeds. Agents reconcile cart, order, and ledger state without polling.
SUB state.stream
04 · Interface

Built for agents. Native to MCP.

One typed API surface, mirrored as an MCP server. The example below executes a two-item purchase, settles on Solana, and returns a signature — in one call.

agent_purchase.py MCP · execute_transaction
# Agent executes a multi-line purchase from blkbxpay import Client client = Client(mcp=True) tx = client.execute_transaction( merchant="mch_8f3a2c", cart=[ {"sku": "itm_904", "qty": 2}, {"sku": "itm_117", "qty": 1}, ], settlement={"rail": "solana", "asset": "USDC"}, idempotency_key="agt_2026_05_19_a4f", ) # → tx.status == "settled" (finality < 1s) # → tx.signature == "5VzN…Yk2"
agent_runtime · stdout live
mcp.connect() tls · 12ms
✓ session authed scope: tx.write v0.4
✓ merchant.resolve("mch_8f3a2c") SLA 99.99
─ CART 2 items
+ itm_904 × 2 · "Mode-X loop kit" USDC 98.00
+ itm_117 × 1 · "Studio cable" USDC 44.50
= cart.total USDC 142.50
submitting to solana… block 287,432,184
✓ settled · 0.83s finality
⎯ sig: 5VzN73mP…Yk2A on-chain
tx_4f3a2c · USDC 142.50 credited to mch_8f3a2c
0.83s
MCP-firstDrop-in tool for Claude, GPT, and agent frameworks.
Structured responsesTyped JSON with explicit errors and next-actions.
p50 < 80msStreaming partial results so agents keep planning.
IdempotentAgent-scoped keys; retries are safe by design.
05 · Settlement

Settled on Solana. Instant. Programmable. Sub-cent.

Live · Solana mainnet
BLOCK287,432,184
✓ settled · 0.83s
✓ settled · 0.74s
✓ settled · 0.91s
INCOMING · tx.execute() SETTLED · on-chain signature
Finality
< 1s
Near-instant block confirmation. No batch windows, no T+1.
Cost
< $0.01
Per transaction. Predictable fees that survive micro-payments.
Reconciliation
Deterministic
On-chain signatures resolve disputes. No reconciliation lag.
Logic
Programmable
Conditional execution, escrow, and multi-party splits as primitives.
Powered by stablecoin rails. Not a crypto product — a settlement infrastructure choice.
06 · Distribution

Protocol, not product.

BlkBxPay embeds inside the systems where agents already operate.

BlkbxPay
Protocol
12,481 tx · 24h
AI Assistants
Enterprise Copilots
Operating Systems
Procurement Platforms
Concierge Agents
Robotics Systems
Autonomous Networks
The consumer app is incidental. The protocol is the asset.
07 · Build

Build on BlkBxPay.

Integrate the protocol, become discoverable to agents, or get in touch.

Read the docs → Get early access