Fetch a target x402 endpoint without paying it, inspect the live 402 quote, optionally audit the service origin, compare expected payTo/network/asset/scheme/price, and return a buyer-facing go/no-go policy pack with runtimePolicyJson, mcpGuardConfig, flowiseGuardConfig, auditLogSchema, and pay/ma...
AI agents call gpt55_x402_buyer_prepay_risk_score to retrieve information from GPT 5 5 x402 Low Cost Agent Tools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
url | string | — | |
body | object | — | |
method | string | — | |
endpoint | string | — | |
resource | string | — | |
timeout_ms | integer | — | |
maxPriceUsd | number | — | |
maxLatencyMs | integer | — | |
expectedAsset | string | — | |
expectedPayTo | string | — | |
max_price_usd | number | — | |
allowedSchemes | string | — |
Parameters from the server's own tool schema.
The tool fetches and inspects a live endpoint to retrieve payment/quote metadata and returns a risk/policy assessment. It explicitly states it never sends a payment header, making it a read/audit operation. However, it does make outbound HTTP requests to external endpoints which could have side effects depending on the target, and it involves payment infrastructure context.
From the tool's definition Fetch a target x402 endpoint without paying it, inspect the live 402 quote, optionally audit the service origin... This deterministic endpoint never sends a payment header to the target endpoint and does not call an upstream model.
Risk signalsAccepts URL/endpoint input (url) · Accepts raw HTML/template content (body) · High parameter count (20 properties)
Attacks that exploit this kind of access
Fetch a target x402 endpoint without paying it, inspect the live 402 quote, optionally audit the service origin, compare expected payTo/network/asset/scheme/price, and return a buyer-facing go/no-go policy pack with runtimePolicyJson, mcpGuardConfig, flowiseGuardConfig, auditLogSchema, and pay/manual-review/skip guidance. This deterministic endpoint never sends a payment header to the target endpoint and does not call an upstream model. Pay up to $0.006 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. It is categorised as a Read tool in the GPT 5 5 x402 Low Cost Agent Tools MCP Server, which means it retrieves data without modifying state.
gpt55_x402_buyer_prepay_risk_score accepts 12 parameters: url, body, method, endpoint, resource, timeout_ms, maxPriceUsd, maxLatencyMs, expectedAsset, expectedPayTo, max_price_usd, allowedSchemes. The full parameter table on this page comes from the server's own tool schema.
Register the GPT 5 5 x402 Low Cost Agent Tools MCP server in PolicyLayer and add a rule for gpt55_x402_buyer_prepay_risk_score: 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 GPT 5 5 x402 Low Cost Agent Tools. Nothing to install.
gpt55_x402_buyer_prepay_risk_score is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the gpt55_x402_buyer_prepay_risk_score 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.
Set action: deny in the PolicyLayer policy for gpt55_x402_buyer_prepay_risk_score. 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.
gpt55_x402_buyer_prepay_risk_score is provided by the GPT 5 5 x402 Low Cost Agent Tools MCP server (https://gpt55.558686.xyz/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
gpt55_x402_buyer_prepay_risk_score is one line of GPT 5 5 x402 Low Cost Agent Tools's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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