Use when an agent must check several x402 sellers before paying: up to 10 resource URLs or seller domains in one call, each with the same label as the free /v1/check (checks_passed, check_first, checks_failed or no_data), reason codes, conclusive test-buy count, last delivered date and an evidence link, in one signed answer. Based on Lumi Trades' record; it does not contact the sellers. Not charged on bad input. Observations, not a guarantee.

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