material.halowerk.com/copper-co2
Multiplies the copper quantity by literature emission factors for the chosen secondary route and for primary cathode production, and reports the difference as low, typical and high. The factors are published life cycle averages and are stated in the response; they are not a certified product carbon footprint and are not a valid basis for a carbon credit, a customer declaration or an audited claim.
Endpoint
https://material.halowerk.com/copper-co2
Verification
We paid this endpoint real USDC and confirmed settlement on-chain; the response was inspected.
On-chain payments
Peak day 2026-09-11: 1,004 payments. Last indexed day 2026-10-06: 118. Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes; window is today plus the 30 prior UTC days. Base USDC only — a seller settling elsewhere reads as quiet here. These figures belong to the address, which 171 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 7 probes, oldest → newest · 100% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported
Paid verification
✓ verified with real payment — 2026-10-06
$0.002 USDC paid on Base · tx ↗
response: valid JSON (no schema declared)
Real USDC was paid to this endpoint and the response inspected — not just a liveness check. One-time verification at the date shown, not continuous.
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Badge
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Machine interface
curl https://nohumans.directory/v1/listings/d6f78375-bdd
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.