sap_x402_prepare_payment

SERVERSap SOURCEhttps://mcp.sap.oobeprotocol.ai/mcp

Critical RISK CLASS

Category Financial

Parameters 100 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/oobe-protocol-labs-sap-mcp-server/sap-x402-prepare-payment.md

WHAT IT DOES

What sap_x402_prepare_payment does on Sap

AI agents use sap_x402_prepare_payment to commit financial operations through Sap, usually the final step of a payment, billing, or trading workflow. A call moves real money.

Parameter	Type	Required	Description
`nonce`	string	—	Optional escrow nonce as a decimal string. Defaults to 0.
`deposit`	string	—	Initial deposit as a decimal string. Amount in the escrow token smallest unit: lamports for SOL, micro-USDC for USDC, or base units for the configured SPL token
`maxCalls`	string	—	Optional maximum number of calls covered
`expiresAt`	string	—	Optional expiry timestamp in unix seconds
`tokenMint`	string	—	Optional SPL token mint; omit/null for SOL. Use EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v for mainnet USDC.
`agentWallet`	string	—	Agent wallet public key (base58)
`volumeCurve`	array	—	Optional array of { afterCalls, pricePerCall } pricing breakpoints
`pricePerCall`	string	—	Price per call as a decimal string. Amount in the escrow token smallest unit: lamports for SOL, micro-USDC for USDC, or base units for the configured SPL token.
`tokenDecimals`	number	—	Optional token decimals. Defaults to 6 for USDC/SPL flows when supplied by the SDK and 9 for native SOL.
`networkIdentifier`	string	—	Optional x402 network identifier written into headers

Parameters from the server's own tool schema.

RISK

Why sap_x402_prepare_payment is rated Critical

Prepares financial payment transactions involving escrow funding and settlement operations.

From the tool's definition prepare x402 payment context, production escrow funding, payment and settlement flow

Risk signalsHigh parameter count (10 properties)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sap_x402_prepare_payment safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Sap, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For sap_x402_prepare_payment, this is the rule to start with:

sap_x402_prepare_payment Approval-gated

Any call to sap_x402_prepare_payment is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sap_x402_prepare_payment": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Sap, apply this rule, and every sap_x402_prepare_payment call is checked against it from then on.

FAQ

Questions about sap_x402_prepare_payment

What does the sap_x402_prepare_payment tool do? +

Prepare an x402 payment context using SDK X402Registry.preparePayment. New production escrow funding should use Escrow V2 fields and nonce-aware flows. SAP MCP context: Payment and settlement flow. Estimate or fetch state before creating escrows or settling calls; write operations require an enabled signer mode and MCP policy approval. SAP MCP execution guidance: Intent: SAP MCP tool workflow. Pricing: paid value-action; preview cost and transaction effects before user confirmation. Routing: paid hosted call; call sap_estimate_tool_cost first, then use sap_payments_call_paid_tool if the runtime cannot handle x402 natively. Signer boundary: hosted reads/builders never receive keypair bytes; value-moving results must be finalized locally when signing is required. It is categorised as a Financial tool in the Sap MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

What parameters does sap_x402_prepare_payment accept? +

sap_x402_prepare_payment accepts 10 parameters: nonce, deposit, maxCalls, expiresAt, tokenMint, agentWallet, volumeCurve, pricePerCall, tokenDecimals, networkIdentifier. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on sap_x402_prepare_payment? +

Register the Sap MCP server in PolicyLayer and add a rule for sap_x402_prepare_payment: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Sap. Nothing to install.

What risk level is sap_x402_prepare_payment? +

sap_x402_prepare_payment is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit sap_x402_prepare_payment? +

Yes. Add a rate_limit block to the sap_x402_prepare_payment rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block sap_x402_prepare_payment completely? +

Set action: deny in the PolicyLayer policy for sap_x402_prepare_payment. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides sap_x402_prepare_payment? +

sap_x402_prepare_payment is provided by the Sap MCP server (https://mcp.sap.oobeprotocol.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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