# gpt55_sub2api_official_metered_invoice

Produce a buyer-ready postpaid GPT-5.5 invoice using the read-only sub2api pricing formula: input, output, cache creation, cache read, image output, service tier, long-context pricing, and rate multiplier. Returns machine-readable invoice JSON for usage-metered x402 clients without modifying sub2api. Pay up to $0.066667 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_sub2api_official_metered_invoice`. HTML page: https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-sub2api-official-metered-invoice

## Facts

- Tool: `gpt55_sub2api_official_metered_invoice`
- 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: Financial (Critical risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: *
- Server rate-limited: yes
- Parameters: 12
- Recommended policy verdict: Approval-gated

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `tier` | string | no |  |
| `model` | string | no |  |
| `modelId` | string | no |  |
| `model_id` | string | no |  |
| `requestId` | string | no |  |
| `request_id` | string | no |  |
| `serviceTier` | string | no |  |
| `input_tokens` | integer | no |  |
| `promptTokens` | integer | no |  |
| `service_tier` | string | no |  |
| `contextTokens` | integer | no |  |
| `output_tokens` | 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_sub2api_official_metered_invoice",
    "arguments": {}
  }
}
```

## Why gpt55_sub2api_official_metered_invoice is rated Critical

This tool triggers financial transactions — it commits payment obligations via x402 USDC on Base or Solana USDC, making it Financial in category. The blast radius is high because an AI agent could repeatedly invoke it, accumulating real monetary charges up to $0.066667 per call with no stated rate limit, though individual amounts are small.

From the tool's own definition: "Produce a buyer-ready postpaid GPT-5.5 invoice... Pay up to $0.066667 per request with x402 USDC on Base or choose the fixed-price Solana USDC option... Exact fixed-price payment and Base upto token-metered payment are both accepted"

Risk signals: High parameter count (25 properties)

## Use case

AI agents use gpt55_sub2api_official_metered_invoice to commit financial operations through GPT 5 5 x402 Low Cost Agent Tools, usually the final step of a payment, billing, or trading workflow. A call moves real money.

## Recommended policy (PolicyLayer)

Verdict: **Approval-gated**. 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_sub2api_official_metered_invoice": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}
```

## 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
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- `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
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- `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
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- `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
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- `gpt55_x402_agentic_api_red_team_brief` — Financial — https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-x402-agentic-api-red-team-brief.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