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_get 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 only fetches and inspects an HTTP 402 response to provide guidance — it explicitly does not send any payment and has no side effects on the target. It is a read/inspection operation. Severity is medium because it does involve financial infrastructure inspection and could be used to probe payment endpoints, and the tool itself incurs a small cost per use (up to $0.004), though it does not itself move funds.
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. GET variant for agents that prefer query parameters. 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_get 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_get: 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_get 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_get 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_get. 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_get 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_get 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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