# x402 Oracle /v1/trade-check

x402 Oracle is necessary infrastructure for autonomous trading agents that rely on x402 endpoints for market data, oracle data, price signals, funding data, or execution inputs. Before the agent pays a target x402 endpoint and trades on the result, it should check whether that endpoint is fresh, fast, live, and free of payment-term drift.

Endpoint: https://api.x402oracle.com/v1/trade-check
Route: /v1/trade-check
Price: $0.002 / 2000 atomic USDC
Chain: eip155:8453
Asset: USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
payTo: 0x2DF1AEc598a104Fc15E80C0B60e50C497559A980

This is a PAID x402 route. The agent can discover the exact request inputs and output shape by calling the endpoint WITHOUT payment. That unpaid call returns an HTTP 402 challenge with payment requirements plus the input and output metadata. The agent can then call WITH payment through its x402 client to receive the actual trust service for the requested resource.

Use the oracle immediately before paying any x402 endpoint that can influence a trade. Checking trust before paying protects the agent from paying stale, slow, down, or drifted endpoints and then trading on bad information.

Recommended skip rule: skip the target endpoint, do not pay it, and do not trade on it when the paid trust response indicates the target is stale, untracked, failing, above the agent's latency tolerance, or has recent price, payTo, or chain drift that violates the agent's policy.

The Private Monitor must never send an X-PAYMENT header or any payment-like header. It must never sign, authorize, settle, or submit a payment. Monitoring is limited to unpaid requests that observe free HTTP 402 challenges.