For AI agents

Shopping agents can ask SigPath before they buy. Pay per check in USDC on Solana through pay.sh, with no account and no API key.

AskGET /api/check?q=…
Pay0.002 USDC, approved by the agent's wallet
ActBest checked deal, and why the others aren't

Try it in the sandbox

Test network and test USDC: nothing real is spent.

npx @solana/pay --sandbox gate api paysh/sigpath.yaml --bind 127.0.0.1:1402
npx @solana/pay --sandbox curl "http://127.0.0.1:1402/api/check?q=ThinkPad%20X1"

Funding the agent's wallet

On mainnet an agent pays from a Solana wallet holding a little USDC, plus a little SOL for network fees. The MoonPay CLI gives an agent its own wallet and buys crypto with a card. Its keys stay on the machine it runs on: write down the recovery phrase it shows you. Not needed for the sandbox above.

npm i -g @moonpay/cli
mp login --email you@example.com          # then mp verify with the emailed code
mp wallet create --name "agent"
mp buy --token SOL --chain solana --amount 1 --wallet agent
mp token swap --wallet agent --chain solana \
  --from-token So11111111111111111111111111111111111111111 --from-amount 0.1 \
  --to-token EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v   # SOL to USDC
mp token balance list --wallet <address> --chain solana

If the agent pays from a different wallet, send the USDC there; mp tools lists every command. The MoonPay CLI is MoonPay's, not SigPath's: SigPath never sees the wallet or the purchase.

What comes back

A live answer from the demo feed, trimmed to one deal and one warning.

{
  "query": "ThinkPad X1",
  "bestChecked": [
    {
      "condition": "new",
      "listing": {
        "title": "Lenovo ThinkPad X1 Carbon G7 | 14 Zoll | Optimaler Akku 80%+ (geprüft) | Wie neu",
        "url": "https://www.ebay.de/itm/366517711748?_skw=ThinkPad+X1&hash=item5556287384:g:w8AAAeSwUypqRlXF&amdata=enc%3AAQALAAAA8Of5zIIojhOf%2BkQK%2Bxzjn7lJViVtbnlrtTYtPpeEwH%2Be4auN4NHQS9jHXlVxnXK4MZTKeGSXCl0BxXAxYNXvgkbzbpfrR2YZplY5Nnz53dCQWUn2eTwk4oZOqHW2oE2B7o3Rt8b4V8ePk%2FG%2BhUmIOJQ6UR0cJs3uDqQS4QXY20SwBvmuXq3cnVcY5ACedhcs5Hz5bL8%2FtzrLqR3INCj0eMqY7kLjmLoskGyt%2Fn2tnj9tHc%2FcCe5iDYVRRSBkzjchn2jxf%2FGByIBg7qVcBav2LfjBErbtW7ZeoHLPLRNREGk6vDsSjNDyL5UeT%2Fe0bRnEAw%3D%3D",
        "marketplace": "eBay",
        "condition": "refurbished",
        "total": "299.00 EUR",
        "verdict": "checked",
        "headline": "SigPath-checked",
        "reasons": [
          "Well below the market: 37% under the median of 12 listings of the same model and configuration (Carbon) on eBay, though not low enough to be flagged.",
          "Photo not checked: it's a product picture on a white background, not a photo of the item itself.",
          "Seller has 203 ratings (100% positive) on eBay; account age isn't published, so it wasn't checked.",
          "No upheld fake-product reports against this seller."
        ],
        "verifiedSeller": false,
        "verifiedBusiness": null
      },
      "belowMedian": "176.48 EUR"
    }
  ],
  "listings": [
    {
      "title": "Lenovo ThinkPad X1 Carbon 4th 14\"- intel Core i7 6600U - 16GB - 256GB - Win11",
      "url": "https://www.ebay.de/itm/237146848773?_skw=ThinkPad+X1&hash=item37370dbe05:g:d2oAAeSw65tq4J-x",
      "marketplace": "eBay",
      "condition": "used",
      "total": "160.00 EUR",
      "verdict": "caution",
      "headline": "Look closer",
      "reasons": [
        "Priced well below the median of 5 comparable used listings on eBay."
      ],
      "verifiedSeller": false,
      "verifiedBusiness": null
    }
  ],
  "counts": {
    "checked": 12,
    "caution": 2,
    "unchecked": 36
  },
  "searched": [
    "eBay"
  ],
  "checkedMeans": "SigPath-checked means its price was compared with listings of the same model, configuration and condition and isn't suspiciously low, and none of the seller and photo checks we could run raised a flag. Each listing says which checks ran. It isn't a guarantee the item is genuine — if it isn't, report it."
}

“Checked” is not a guarantee, and every answer says so: an agent passing a verdict on should pass that line on too. Shoppers can search here for free. Verifying sellers, businesses or suppliers? See the SigPath API.