# gpt55_eip712_signature_risk_decoder

Inspect eth_signTypedData / EIP-712 payloads before signing, including ERC20 Permit, Permit2, transferWithAuthorization, NFT operator approvals, spender fields, deadlines, nonces, chainId, verifyingContract, and unlimited allowance values. Returns risk flags and a wallet confirmation checklist without using a private key, producing a signature, sending a transaction, or calling an external API. Pay up to $0.01 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_eip712_signature_risk_decoder`. HTML page: https://policylayer.com/tools/xyz-558686-gpt55-token-gateway/gpt55-eip712-signature-risk-decoder

## Facts

- Tool: `gpt55_eip712_signature_risk_decoder`
- 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: 8
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `json` | string | no |  |
| `text` | string | no |  |
| `chain` | string | no |  |
| `value` | object | no |  |
| `typedData` | object | no |  |
| `typed_data` | object | no |  |
| `known_addresses` | object | no |  |
| `expected_chain_id` | object | 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_eip712_signature_risk_decoder",
    "arguments": {}
  }
}
```

## Why gpt55_eip712_signature_risk_decoder is rated Low

This is a read-only analysis tool. It examines blockchain transaction payloads and returns informational risk assessments and checklists to help users understand what they are about to sign. The tool performs no writes, executions, destructions, or financial transactions itself.

From the tool's own definition: "Tool inspects and analyzes EIP-712 payloads to 'Inspect...before signing' and 'Returns risk flags and a wallet confirmation checklist without using a private key, producing a signature, sending a transaction, or calling an external API.' The tool explicitly…"

## Use case

AI agents call gpt55_eip712_signature_risk_decoder 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_eip712_signature_risk_decoder": {}
  }
}
```

## 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