x402 Paid MCP Authorization Bridge

x402

x402 Paid MCP Authorization Bridge is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-14).

Generates a complete authorization package (MCP scope contract, x402 quote gate, retry plan, receipt gate, client policy JSON, audit schema, and fail-closed snippet) for agents needing explicit authorization before spending USDC on paid MCP tools.

Price / call$0.012

Seller volume →—

Success—

StatusUnknown

How this service works

Turn a paid MCP tool route, buyer authorization scope, x402 quote expectations, spend caps, and receipt requirements into a copy-paste authorization bridge: MCP scope contract, x402 quote gate, same-request retry plan, receipt-bound execution gate, client policy JSON, audit schema, and fail-closed runtime snippet. Built for agents that need explicit authorization before spending real USDC on paid MCP tools. This deterministic endpoint does not call an upstream model and never asks for private keys. Pay up to $0.012 per request with x402 USDC on Base. Public paid calls are limited to 700000 input characters and 4096 output tokens.

Output

Returns a copy-paste authorization package including: an MCP scope contract, an x402 quote gate configuration, a same-request retry plan, a receipt-bound execution gate, a client policy JSON, an audit schema, and a fail-closed runtime code snippet — all structured to enforce explicit authorization before the agent spends real USDC on the specified paid MCP tool.

Example use cases

Example prompt

“Generate a full authorization bridge for the paid MCP tool at https://mcp.example.com/v1/tools/my-tool — the MCP server is https://mcp.example.com, authorization scope is 'tools:read:my-tool', max spend is $0.05 per call, daily budget is $2.00 USDC, expected asset is USDC on Base, and I need receipt evidence required and human approval for the first payment.”

Technical details

Endpoint

POSThttps://gpt55.558686.xyz/v1/tools/x402-paid-mcp-authorization-bridge

When to prefer

Use this endpoint when an AI agent needs to generate a complete, deterministic authorization policy before allowing real USDC spending on a paid MCP tool — especially when you need spend caps, receipt verification, human approval gates, audit trails, and fail-closed behavior baked into a single copy-paste package. Prefer this over manual policy construction or general-purpose LLM prompting when you need deterministic, structured output with no upstream model calls.

Side effects

Missing required fields (paid_tool_url, authorization_scope, mcp_server_url) returns a validation error
max_usdc_per_call or daily_budget_usdc out of allowed range returns schema error
expected_asset or expected_network values unrecognized may produce incomplete gate configuration
Input exceeding 700000 characters returns a payload-too-large error
Malformed service_url or mcp_server_url returns URL validation failure

Input

Schema · Request body

Field	Type	Description
method	string
tool_name	string
buyer_agent	string
service_url	string
paid_tool_url	string
expected_asset	string
mcp_server_url	string
allowed_origins	array
expected_pay_to	string
expected_network	string
daily_budget_usdc	number
max_usdc_per_call	number
authorization_scope	string
idempotency_key_header	string
require_receipt_evidence	boolean
require_human_approval_first_payment	boolean

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