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MARKET MONITOR / CATALOGUE Services 86,886 MCP listed 39,685 x402 47,217 Rails Base / Solana / Polygon / Arbitrum Imported 2026-10-26 · 3 sources
Provider

checksum.openverbs.com

checksum.openverbs.com · 4 listed services · provider site

Fletcher-16 / Fletcher-32 x402 REST usage

Fletcher checksum over the input payload, in 16-bit (default) or 32-bit width. Returns the checksum as an unsigned integer and hex. Non-cryptographic.

checksum.openverbs.com Data & Finance 1 calls / 30d checked 2026-10-26
0.002 USDC per call per call

CRC-32 (IEEE) x402 REST usage

CRC-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.

checksum.openverbs.com Data & Finance 1 calls / 30d checked 2026-10-26
0.002 USDC per call per call

CRC-16 (multiple variants) x402 REST usage

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.

checksum.openverbs.com Data & Finance 1 calls / 30d checked 2026-10-26
0.002 USDC per call per call

Adler-32 x402 REST usage

Adler-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.

checksum.openverbs.com Data & Finance 1 calls / 30d checked 2026-10-26
0.002 USDC per call per call

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