Break the test. Make it better.
If a coin matches weight, diameter, thickness, and Pingcoin's acoustic test, we will buy one specimen from you for its verified precious-metal spot value. No questions asked.
Strange non-coin objects count too: if a metal object reproducibly passes Pingcoin as a supported coin, the object bounty is $50.
False-positive coin bounty
This is the spot buyback guarantee. If one physical coin specimen matches weight, diameter, thickness, and passes Pingcoin as a supported coin, Pingcoin will buy that specimen for verified precious-metal spot value. No questions asked.
Supported coin type
The test must be run against a coin type currently supported by Pingcoin.
Weight + dimensions match
The specimen must match the selected coin's weight, diameter, and thickness.
Pingcoin passes it
The same item must receive a passing acoustic result for that selected coin type.
One specimen limit
Pingcoin buys one qualifying physical specimen per bounty case, for verified metal spot value only.
False-positive object bounty
If a non-coin object reproducibly passes Pingcoin as a supported coin, we will pay a $50 bounty for the report. This covers resonant metal objects, tools, utensils, and other weird edge cases — not just one canonical example.
- Reward: $50 for a reproducible non-coin object pass.
- Repeatable: show that the same object passes more than once for the same selected coin type.
- Evidence: include video or audio of the object, selected coin, tap, and passing result.
- Not a spot buyback: non-coin objects do not need precious-metal content and are handled separately from the coin spot guarantee.
- Easy link: share /bounty#false-positive-object for the object bounty.
What to send
Give us enough to reproduce, triage, and decide whether the object is worth acquiring.
- Measurements: diameter, thickness, and weight if available.
- Test evidence: video or audio showing the selected coin, tap, and passing result.
- Device info: phone model, OS version, app version, and microphone/accessory details.
- Repeatability: whether the pass happens once, repeatedly, or across multiple devices.
- Object details: what you believe the item is, where it came from, and whether you can transfer it if approved.
How payment works
The headline promise is simple: if a coin matches weight, diameter, thickness, and passes Pingcoin, we buy one specimen for verified precious-metal spot value. Reproducible false-positive objects get $50.
Submit evidence
Send measurements, recording, selected coin type, app result, device details, and repeatability.
One specimen transfer
For coin cases, we arrange transfer of one qualifying specimen for verification and model improvement.
Spot buyback
Qualifying coins are bought for verified precious-metal content at spot. No collector premium, purchase price, or dealer markup.
$50 object bounty
Reproducible non-coin object passes earn $50.
Good submissions look like this.
We are not looking for vibes. We are looking for evidence that lets us reproduce and improve.
Counterfeit or replica
A fake that passes dimensions and Pingcoin against a supported coin type.
Wrong-coin collision
A real coin or round that repeatedly passes as the wrong selected coin type.
Strange object pass
A resonant metal object that reproducibly passes as a supported coin earns a $50 object bounty.
Found a real edge case?
Send the measurements, the recording, and the story. If it beats the layered test, it belongs in our hands.
Submit a bounty claim →