# gpt55_x402_prepay_trust_check Fetch a target x402 endpoint without paying it, inspect the live HTTP 402 quote, and return pay/skip/manual-review guidance for agents based on liveness, latency, amount, payTo, network, asset, scheme, and buyer spend caps. This deterministic endpoint never sends a payment header to the target endpoint and does not call an upstream model. Pay up to $0.004 per request with x402 USDC on Base or choose the fixed-price Solana USDC option when advertised. Exact fixed-price payment and Base upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json. Agent View of the PolicyLayer registry record for `gpt55_x402_prepay_trust_check`. HTML page: https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-prepay-trust-check ## Facts - Tool: `gpt55_x402_prepay_trust_check` - Server: GPT 5 5 x402 Low Cost Agent Tools (`https://gpt55.558686.xyz/mcp`) — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway.md - Homepage: https://github.com/go165/gpt55-x402-gateway - Risk category: Read (Low risk) - Registry record: grade F, identity unverified - Server auth posture: open - Server CORS policy: * - Server rate-limited: yes - Parameters: 12 - Recommended policy verdict: Allowed ## Parameters | Parameter | Type | Required | Description | | --- | --- | --- | --- | | `url` | string | no | | | `body` | object | no | | | `method` | string | no | | | `endpoint` | string | no | | | `timeout_ms` | integer | no | | | `maxPriceUsd` | number | no | | | `maxLatencyMs` | integer | no | | | `expectedAsset` | string | no | | | `expectedPayTo` | string | no | | | `max_price_usd` | number | no | | | `expected_asset` | string | no | | | `max_latency_ms` | integer | no | | Parameters from the server's own tool schema. ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "gpt55_x402_prepay_trust_check", "arguments": {} } } ``` ## Why gpt55_x402_prepay_trust_check is rated Low The tool explicitly fetches and inspects an HTTP 402 quote endpoint without transmitting any payment. It reads liveness, latency, amount, and other metadata to provide guidance. Despite being on a financial-adjacent server and involving payment metadata inspection, no money actually moves — it is a read/inspection operation. From the tool's own definition: "Fetch a target x402 endpoint without paying it, inspect the live HTTP 402 quote, and return pay/skip/manual-review guidance... This deterministic endpoint never sends a payment header to the target endpoint and does not call an upstream model." Risk signals: Accepts URL/endpoint input (url) · Accepts raw HTML/template content (body) · High parameter count (17 properties) ## Use case AI agents call gpt55_x402_prepay_trust_check to retrieve information from GPT 5 5 x402 Low Cost Agent Tools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere. ## Recommended policy (PolicyLayer) Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches GPT 5 5 x402 Low Cost Agent Tools: ```json { "version": "1", "default": "deny", "tools": { "gpt55_x402_prepay_trust_check": {} } } ``` ## Other tools on GPT 5 5 x402 Low Cost Agent Tools (217) - `gpt55_html_strip` — Destructive — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-html-strip.md - `gpt55_x402_buyer_client_adapter_pack` — Destructive — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-buyer-client-adapter-pack.md - `gpt55_regex_match` — Execute — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-regex-match.md - `gpt55_url_parse` — Execute — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-url-parse.md - `gpt55_url_parse_get` — Execute — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-url-parse-get.md - `gpt55_wallet_signing_safety_pack` — Execute — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-wallet-signing-safety-pack.md - `gpt55_answer_professional` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-answer-professional.md - `gpt55_balance_topup` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-balance-topup.md - `gpt55_gpt55_plus_half_price_subscription` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-gpt55-plus-half-price-subscription.md - `gpt55_sub2api_balance_ledger_simulator` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-sub2api-balance-ledger-simulator.md - `gpt55_sub2api_official_metered_invoice` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-sub2api-official-metered-invoice.md - `gpt55_x402_agent_approval_workflow_compiler` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-approval-workflow-compiler.md - `gpt55_x402_agent_core_integration_kit` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-core-integration-kit.md - `gpt55_x402_agent_core_integration_kit_get` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-core-integration-kit-get.md - `gpt55_x402_agent_credit_line_underwriting_pack` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-credit-line-underwriting-pack.md - `gpt55_x402_agent_data_leak_containment_plan` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-data-leak-containment-plan.md - `gpt55_x402_agent_market_data_procurement_firewall` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-market-data-procurement-firewall.md - `gpt55_x402_agent_payment_approval_pack` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-payment-approval-pack.md - `gpt55_x402_agent_payment_authorization_ato_pack` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-payment-authorization-ato-pack.md - `gpt55_x402_agent_payment_due_diligence_pack` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-payment-due-diligence-pack.md - `gpt55_x402_agent_payment_due_diligence_pack_get` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-payment-due-diligence-pack-get.md - `gpt55_x402_agent_payment_policy_compiler` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-payment-policy-compiler.md - `gpt55_x402_agent_procurement_rfp_response_pack` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-procurement-rfp-response-pack.md - `gpt55_x402_agent_runbook_compliance_attestation_pack` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-runbook-compliance-attestation-pack.md - `gpt55_x402_agent_spend_recurrence_guard` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-spend-recurrence-guard.md - `gpt55_x402_agent_spend_simulator` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-spend-simulator.md - `gpt55_x402_agent_task_receipt_outbox` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-task-receipt-outbox.md - `gpt55_x402_agent_treasury_rebalancing_policy` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-treasury-rebalancing-policy.md - `gpt55_x402_agent_wallet_incident_response_pack` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-wallet-incident-response-pack.md - `gpt55_x402_agent_wallet_key_rotation_drill` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agent-wallet-key-rotation-drill.md - …and 187 more: https://policylayer.com/tools/xyz-558686-gpt55-token-gateway.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=xyz-558686-gpt55-token-gateway · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/xyz-558686-gpt55-token-gateway