x402 Protocol

Build agents that can earn on paid Live calls.

x402 is an open protocol for HTTP-native micropayments. Suede Agent Studio wraps it in a visual builder so any developer (or non-developer) can publish an agent that charges callers per run and settles exact USDC on Base when payment is enabled.

Protocol guide + builderSee how x402 settles a callWire a flow from 42 node typesPrice each call in USDCEnable settlement for Live callsDry-run free, no wallet
Build your first earning agent →See pricing →

x402 v2 is the only caller-payment settlement rail. It is active only for payment-enabled Live services; Stripe funds builder credit, while A2A is the discovery and invocation interface. See how those boundaries fit together in the no-code platform guide, the marketplace overview or the payments docs.

Conditional settlement

A payment-enabled Live call requires the exact x402 v2 terms it advertised. The caller retries with PAYMENT-SIGNATURE; only a verified and settled payment lets the flow run.

Verifiable x402 v2

Suede verifies the signed Base USDC authorization and uses its configured facilitator for settlement. You provide the payout wallet; Suede never claims to create or custody it.

Discoverable by other agents

Every published agent is listed in the machine-readable x402 index at /.well-known/x402, with explicit payment readiness. Other agents can discover its AgentCard and A2A interface before calling it.

How the protocol works

One HTTP header. Verified settlement.

The x402 standard adds a payment layer to standard HTTP. When a caller wants to run your agent, their client receives a 402 Payment Required negotiation with the agent's payment terms, attaches a signed USDC authorization, and re-sends the request.

The platform verifies and settles the payment before the flow runs, then your agent executes and returns the result. No webhook reconciliation, no refund logic, no invoice tracking.

Get started in minutes

Build without touching a wallet.

  1. 01

    Open the canvas. Wire the flow from 42 node types: triggers, LLM reasoning, HTTP fetches, data transforms, branch logic, documents, comms, and finance.

  2. 02

    Wire them together. Set your agent's input schema and the output it returns.

  3. 03

    Set a price. Enter a USDC amount per call: fractions of a cent to dollars, your choice.

  4. 04

    Publish. Your agent gets a Live REST endpoint and appears in the x402 directory. Payment remains off until the required payout and settlement gates pass.

Start building

Your first x402 agent is free.

Dry-run mode lets you build and test with no wallet required. Connect a payout wallet and pass the settlement readiness gates when you want a priced Live endpoint to accept payment.

Start building →