Discover / checksum.openverbs.com

CRC-16 (multiple variants)

■ Challenge detected

CRC-16 over the input payload in one of several standard variants (ccitt-false, xmodem, modbus, ibm; default ccitt-false). Returns the checksum as an unsigned integer and 4-digit hex. Non-cryptographic.

x402
Base
USDC

Listed price: $0.002
Challenge detected: 10 of the last 10 checks
Median response: 187 ms
Last checked: 17 Oct, 07:50 UTC
In our index since: 26 Sept 2026

Endpoint

curl -i https://checksum.openverbs.com/v1/crc16
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

4 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://checksum.openverbs.com/v1

POST/adler32$0.002Adler-32 checksum (as used by zlib) over the input payload. Faster than CRC-32 but weaker for short inputs. Returns the checksum as an unsigned integer and 8-digit hex. Non-cryptographic.
POST/crc16$0.002CRC-16 over the input payload in one of several standard variants (ccitt-false, xmodem, modbus, ibm; default ccitt-false). Returns the checksum as an unsigned integer and 4-digit hex. Non-cryptographic.
POST/fletcher$0.002Fletcher checksum over the input payload, in 16-bit (default) or 32-bit width. Returns the checksum as an unsigned integer and hex. Non-cryptographic.
POST/crc32$0.002CRC-32 (IEEE 802.3 polynomial, as used by zip, gzip and PNG) over the input payload. Returns the checksum as an unsigned integer and 8-digit hex. Non-cryptographic — for error detection only.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 4 of 4 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/checksum.openverbs.com

Recent checks

29 Sept 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.17 Oct 2026

All 10 checks

When (UTC)	Result	HTTP	Response
17 Oct, 07:50 UTC	Challenge detected	402	211ms
15 Oct, 23:42 UTC	Challenge detected	402	200ms
14 Oct, 19:26 UTC	Challenge detected	402	200ms
13 Oct, 00:46 UTC	Challenge detected	402	197ms
11 Oct, 06:02 UTC	Challenge detected	402	174ms
9 Oct, 18:38 UTC	Challenge detected	402	175ms
8 Oct, 15:35 UTC	Challenge detected	402	177ms
7 Oct, 15:42 UTC	Challenge detected	402	244ms
6 Oct, 15:31 UTC	Challenge detected	402	163ms
29 Sept, 17:03 UTC	Challenge detected	402	165ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 17 Oct, 07:50 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for CRC-16 (multiple variants)?

Its listed price is $0.002.

What payment terms does CRC-16 (multiple variants) advertise?

The listing advertises x402, Base and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is CRC-16 (multiple variants) listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

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