Fetch x402 discovery documents, rank matching resources by advertised price, live-check the cheapest candidates with 402 quote inspection, and return a buyer-ready shortlist with verified amount, scheme, network, payTo, tags, and warnings. This deterministic endpoint does not call an upstream mod...
AI agents use gpt55_x402_buyer_shortlist_get 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.
| Parameter | Type | Required | Description |
|---|---|---|---|
urls | array | — | |
limit | integer | — | |
query | string | — | |
origins | array | — | |
max_bytes | integer | — | |
timeout_ms | integer | — | |
verify_limit | integer | — | |
discovery_urls | array | — |
Parameters from the server's own tool schema.
This tool involves real financial transactions — it triggers USDC payments on Base or Solana networks as part of its operation. Even though its primary function is fetching and ranking resources, it commits financial obligations (crypto payments) per request, placing it in the Financial category. The blast radius is high because an AI agent could repeatedly trigger payments without user awareness.
From the tool's definition Pay up to $0.005 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
Attacks that exploit this kind of access
Fetch x402 discovery documents, rank matching resources by advertised price, live-check the cheapest candidates with 402 quote inspection, and return a buyer-ready shortlist with verified amount, scheme, network, payTo, tags, and warnings. This deterministic endpoint does not call an upstream model. GET variant for agents that prefer query parameters. Pay up to $0.005 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 Financial tool in the GPT 5 5 x402 Low Cost Agent Tools MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
gpt55_x402_buyer_shortlist_get accepts 8 parameters: urls, limit, query, origins, max_bytes, timeout_ms, verify_limit, discovery_urls. 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_shortlist_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_buyer_shortlist_get is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the gpt55_x402_buyer_shortlist_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_buyer_shortlist_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_buyer_shortlist_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_buyer_shortlist_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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