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 en...
AI agents call gpt55_x402_prepay_trust_check 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 | — | |
timeout_ms | integer | — | |
maxPriceUsd | number | — | |
maxLatencyMs | integer | — | |
expectedAsset | string | — | |
expectedPayTo | string | — | |
max_price_usd | number | — | |
expected_asset | string | — | |
max_latency_ms | integer | — |
Parameters from the server's own tool schema.
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 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 signalsAccepts URL/endpoint input (url) · Accepts raw HTML/template content (body) · High parameter count (17 properties)
Attacks that exploit this kind of access
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. 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_prepay_trust_check accepts 12 parameters: url, body, method, endpoint, timeout_ms, maxPriceUsd, maxLatencyMs, expectedAsset, expectedPayTo, max_price_usd, expected_asset, max_latency_ms. 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_prepay_trust_check: 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_prepay_trust_check 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_prepay_trust_check 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_prepay_trust_check. 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_prepay_trust_check 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_prepay_trust_check 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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