passlisted in Coinbase#18 by calls of 117 on this host
0.001 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
- 3
- Unique payers, trailing 30 days
- 3
- Last called
- 2026-10-08 06:08 UTC
- First observed by TOLLderived
- 2026-10-03
- Pricederived
- 0.001 USDC
- Networks
- 1
How has the volume on this endpoint moved?
Among the 117 endpoints on x402.agentindex.world, validate isbn is tied 18th by calls with 85 others.
validate isbn takes a json body with the field isbn.
A response from validate isbn, as declared, includes valid and format.
Over 30 days: 3 calls, 3 payers, every call from a different payer.
validate isbn was last called 4 days before the snapshot.
The declared price is 0.001 USDC on Base.
validate isbn, a POST endpoint on x402.agentindex.world, appears in the Coinbase registry; TOLL's taxonomy puts it in the "other" category.
validate isbn answered the sweep of 2026-10-11 with a valid 402, as at every sweep since 2026-10-03.
Closest in price to validate isbn within the "other" category: convert timezone at 402timezones.vercel.app and abstractapi live at x402.orthogonal.com.
validate isbn is the cheapest of 3,587 comparable listings in the "other" category; none asks less.
validate isbn out-counts 46% of the 3,554 endpoints in the "other" category that carry counters.
The wallet paid by validate isbn is the payee of 116 endpoints on one host.
Seller tags: isbn, book, validation and checksum.
The price of validate isbn is declared by 554 other listings in the "other" category too.
the payment options, as of 2026-10-12 05:54 UTC · method · pinnable
| registry | network | asset | amount | scheme | pay to |
|---|---|---|---|---|---|
| Coinbase | eip155: | USDC | 0.001 USDC | exact | 0xb3F32b…9BA69d |
the checks, as of 2026-10-11 11:32 UTC · method · pinnableendpoint answered HTTP 402
No named check failed.
Every sweep that observed this endpoint, newest first.
| observed, UTC | state | failed checks | sweep |
|---|---|---|---|
| 2026-10-11 11:32 UTC | pass | 0 | daily-2026-10-11 |
| 2026-10-10 19:38 UTC | pass | 0 | daily-2026-10-10 |
| 2026-10-09 13:55 UTC | pass | 0 | daily-2026-10-09 |
| 2026-10-08 15:16 UTC | pass | 0 | daily-2026-10-08 |
| 2026-10-07 14:34 UTC | pass | 0 | daily-2026-10-07 |
| 2026-10-06 16:37 UTC | pass | 0 | daily-2026-10-06 |
| 2026-10-05 13:00 UTC | pass | 0 | daily-2026-10-05 |
| 2026-10-04 15:24 UTC | pass | 0 | daily-2026-10-04 |
| 2026-10-03 11:40 UTC | pass | 0 | new-after-daily-2026-10-03 |
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 2026-10-08 06:08 UTC · method · live
The input and output block
{
"input": {
"body": {
"isbn": "0-306-40615-2"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"valid": true,
"format": "ISBN-10"
}
}
}Cite this page
The pinned URL below renders this page from the snapshot of 2026-10-12 05:54 UTC and does not change; the live page does, every six hours. Data reuse is under CC BY 4.0 (terms).
Plain text
TOLL, "validate isbn on x402.agentindex.world", snapshot of 2026-10-12 05:54 UTC. https://tollindex.com/e/x402-agentindex-world-validate-isbn-fdd0de/at/2026-10-12T05-54Z. Accessed [access date].
BibTeX
@misc{toll-e-x402-agentindex-world-validate-isbn-fdd0de-2026-10-12T05-54Z,
author = {TOLL},
title = {validate isbn on x402.agentindex.world},
howpublished = {\url{https://tollindex.com/e/x402-agentindex-world-validate-isbn-fdd0de/at/2026-10-12T05-54Z}},
year = {2026},
month = {10},
note = {Pinned view of the snapshot of 2026-10-12 05:54 UTC. Accessed [access date].}
}None yet. Anything submitted through the form below is published here with its outcome.