About

Why it exists

Discovery systems say what exists, providers say what they claim and payment networks say what settled. A question about reliability, pricing, failure or change over time cannot be answered from any of those alone, so the record that answers it has to be measured independently and kept.

How we measure →

Why it is independent

probe402 measures every endpoint with the same published rubric, on the schedule published for it, into the same public record. A paid engagement changes nothing in the public record. Every claim here is a dated observation made from probe402's vantage, never a statement about what an endpoint is.

probe402's own endpoint is on the endpoint list and is graded by the same code; every observation of it carries a flag saying so.

Limits

probe402 reports what its instruments establish and does not infer beyond the evidence they produce.

Paid delivery is measured: a separate, named tool pays the endpoints on the published panels, and every paid attempt is graded by a published rule and kept on the record.

probe402's paid-delivery programme has made 3,820 paid attempts against 758 endpoints on the published list. For 2,492 of those attempts the seller's settlement response names a transaction; for 92 a payment was sent and the response named none, so the response alone does not show whether those settled.

Does paying an endpoint deliver what was bought?

The method in full →