passlisted in Coinbase#173 by calls of 177 on this host
1 USDC
per call, as the listing declares it on eip155:
- Validation state
- pass
- Uptime, 7 / 30 / 90 days
- 100% / 100% / 100%
- Calls, trailing 30 days
- 1
- Unique payers, trailing 30 days
- 1
- Last called
- 2026-10-09 21:59 UTC
- First observed by TOLLderived
- 2026-10-10
- Pricederived
- 1 USDC
- Networks
- 2
How big is this endpoint among the ones like it?
No trace is drawn of this endpoint’s own volume. Its counters have changed 1 time across 10 observations, and 3 changes are the fewest this site will draw a trace through, because two points and a guess are not a series. Every observation is in the JSON.
TOLL first observed it on 2026-10-10.
merchant key, a GET endpoint on underground.substratesymposium.com, appears in the Coinbase registry; TOLL's taxonomy puts it in identity.
On Base, merchant key asks 1 USDC per call.
Its declared input names no parameters.
merchant key answered the sweep of 2026-10-23 with a valid 402, as at every sweep since 2026-10-10.
A response from merchant key, as declared, includes title, content, product and delivered_at.
merchant key accepts payment on Base and Solana, 2 options in all, to 2 different wallets.
Of underground.substratesymposium.com's 177 listings, merchant key ranks tied 173rd by calls with 4 others.
merchant key drew a single call from a single payer in the trailing 30 days.
The last call to merchant key came 4 days before the snapshot, 2026-10-09.
Closest in price to merchant key within identity: c2pa verdict attest at rubric-protocol.com and sanctions check at api.strale.io.
merchant key is near the top of prices in identity; 98% of comparable listings are cheaper.
The wallet paid by merchant key is the payee of 179 endpoints across 2 hosts.
the payment options, as of 2026-10-13 14:08 UTC · method · pinnable
| registry | network | asset | amount | scheme | pay to |
|---|---|---|---|---|---|
| Coinbase | eip155: | USDC | 1 USDC | exact | 0xA3bAbB…d18E08 |
| Coinbase | solana: | USDC | 1 USDC | exact | 5HK2dGaa…tX1tkN |
the checks, as of 2026-10-23 10:52 UTC · method · pinnableendpoint answered HTTP 402
No named check failed.
Every sweep that observed this endpoint, newest first.
| observed, UTC | state | failed checks | sweep |
|---|---|---|---|
| 2026-10-23 10:52 UTC | pass | 0 | daily-2026-10-23 |
| 2026-10-21 20:09 UTC | pass | 0 | daily-2026-10-21 |
| 2026-10-19 10:38 UTC | pass | 0 | daily-2026-10-19 |
| 2026-10-18 18:45 UTC | pass | 0 | daily-2026-10-18 |
| 2026-10-16 08:29 UTC | pass | 0 | daily-2026-10-16 |
| 2026-10-15 10:25 UTC | pass | 0 | daily-2026-10-15 |
| 2026-10-14 08:17 UTC | pass | 0 | daily-2026-10-14 |
| 2026-10-13 13:09 UTC | pass | 0 | daily-2026-10-13 |
| 2026-10-12 10:33 UTC | pass | 0 | daily-2026-10-12 |
| 2026-10-11 09:10 UTC | pass | 0 | daily-2026-10-11 |
| 2026-10-10 17:24 UTC | pass | 0 | daily-2026-10-10 |
| 2026-10-10 06:45 UTC | pass | 0 | new-after-daily-2026-10-10 |
Presence in a registry, not liveness of the service (method). Newest first.
- listed in Coinbase
From the registry record, not validated by TOLL.the declared schema, as of 2026-10-09 21:59 UTC · method · live
The input and output block
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
},
"output": {
"type": "json",
"example": {
"title": "Certify Your Wallet + MerchantKey",
"content": "Signed Ed25519 attestation of end-to-end x402 conformance plus @maraventano/map decoder source inline",
"product": "certify_your_wallet",
"delivered_at": "2026-07-18T17:00:00Z"
}
}
}Cite this page
The pinned URL below renders this page from the snapshot of 2026-10-13 14:08 UTC and does not change; the live page does, every six hours. Data reuse is under CC BY 4.0 (terms).
Plain text
TOLL, "merchant key on underground.substratesymposium.com", snapshot of 2026-10-13 14:08 UTC. https://tollindex.com/e/underground-substratesymposium-com-api-merchant-key-b05861/at/2026-10-13T14-08Z. Accessed [access date].
BibTeX
@misc{toll-e-underground-substratesymposium-com-api-merchant-key-b05861-2026-10-13T14-08Z,
author = {TOLL},
title = {merchant key on underground.substratesymposium.com},
howpublished = {\url{https://tollindex.com/e/underground-substratesymposium-com-api-merchant-key-b05861/at/2026-10-13T14-08Z}},
year = {2026},
month = {10},
note = {Pinned view of the snapshot of 2026-10-13 14:08 UTC. Accessed [access date].}
}None yet. Anything submitted through the form below is published here with its outcome.