sap_x402_build_payment_headers

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-build-payment-headers.md

WHAT IT DOES

What sap_x402_build_payment_headers does on Sap

AI agents use sap_x402_build_payment_headers 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	—	Escrow nonce as a decimal string. Defaults to 0.
`network`	string	—	Optional override for X-Payment-Network
`agentPda`	string	—	Agent PDA (base58)
`maxCalls`	string	—	Max calls as a decimal string
`escrowPda`	string	—	Escrow PDA (base58)
`agentWallet`	string	—	Agent wallet public key (base58)
`txSignature`	string	—	Escrow creation transaction signature
`pricePerCall`	string	—	Price per call in token base units
`depositorWallet`	string	—	Depositor wallet public key (base58)
`networkIdentifier`	string	—	x402 network identifier stored in the payment context

Parameters from the server's own tool schema.

RISK

Why sap_x402_build_payment_headers is rated Critical

Tool builds payment headers and participates in financial transaction settlement flows.

From the tool's definition Payment and settlement flow, creating escrows, pay/build, finalize transactions

Risk signalsHigh parameter count (10 properties)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sap_x402_build_payment_headers 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_build_payment_headers, this is the rule to start with:

sap_x402_build_payment_headers Approval-gated

Any call to sap_x402_build_payment_headers 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_build_payment_headers": {
      "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_build_payment_headers call is checked against it from then on.

FAQ

Questions about sap_x402_build_payment_headers

What does the sap_x402_build_payment_headers tool do? +

Build SAP x402 HTTP headers from a public PaymentContext returned by sap_x402_prepare_payment. 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: hosted unsigned transaction builder. Pricing: paid builder; estimate first, then pay/build and finalize unsigned transactions locally when returned. Routing: hosted-safe builder. If a transaction is returned, preview/sign/submit with sap_payments_finalize_transaction; never create temporary signing scripts. Signer boundary: user-controlled local profile or external signer; OOBE hosted MCP remains non-custodial. 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_build_payment_headers accept? +

sap_x402_build_payment_headers accepts 10 parameters: nonce, network, agentPda, maxCalls, escrowPda, agentWallet, txSignature, pricePerCall, depositorWallet, 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_build_payment_headers? +

Register the Sap MCP server in PolicyLayer and add a rule for sap_x402_build_payment_headers: 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_build_payment_headers? +

sap_x402_build_payment_headers 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_build_payment_headers? +

Yes. Add a rate_limit block to the sap_x402_build_payment_headers 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_build_payment_headers completely? +

Set action: deny in the PolicyLayer policy for sap_x402_build_payment_headers. 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_build_payment_headers? +

sap_x402_build_payment_headers 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.

KEEP EXPLORING

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