| Check Semver Tilde API Call when an agent needs whether a string is a tilde semver range. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/check-semver-tilde first. |  syntexa.ch | - | $0.003 | listed |
| Check URL Any API Call when an agent needs whether a string is any absolute URL. No fetch. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-url-any first. | syntexa.ch | - | $0.008 | listed |
| Check URL HTTP API Call when an agent needs whether a URL uses the http scheme. No fetch. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-url-http first. | syntexa.ch | - | $0.005 | listed |
| Check URL Https API Call when an agent needs whether a URL uses the https scheme. No fetch. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-url-https first. | syntexa.ch | - | $0.006 | listed |
| Check URL Web API Call when an agent needs whether a URL is http or https. No fetch. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/check-url-web first. | syntexa.ch | - | $0.007 | listed |
| Check Upc A API Call when an agent needs whether a 12-digit UPC-A passes Luhn. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-upc-a first. | syntexa.ch | - | $0.009 | listed |
| Check Upc E API Call when an agent needs whether an 8-digit UPC-E-shaped number passes Luhn. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-upc-e first. | syntexa.ch | - | $0.01 | listed |
| Check Vat At API Call when an agent needs whether a AT VAT checksum is valid. No registry lookup. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-vat-at first. | syntexa.ch | - | $0.01 | listed |
| Check Vat Be API Call when an agent needs whether a BE VAT checksum is valid. No registry lookup. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-vat-be first. | syntexa.ch | - | $0.009 | listed |
| Check Vat Bg API Call when an agent needs whether a BG VAT checksum is valid. No registry lookup. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/check-vat-bg first. | syntexa.ch | - | $0.003 | listed |
| Check Vat De API Call when an agent needs whether a DE VAT checksum is valid. No registry lookup. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-vat-de first. | syntexa.ch | - | $0.005 | listed |
| Check Vat Dk API Call when an agent needs whether a DK VAT checksum is valid. No registry lookup. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/check-vat-dk first. | syntexa.ch | - | $0.003 | listed |
| Check Vat Ee API Call when an agent needs whether a EE VAT checksum is valid. No registry lookup. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/check-vat-ee first. | syntexa.ch | - | $0.001 | listed |
| Check Vat Es API Call when an agent needs whether a ES VAT checksum is valid. No registry lookup. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-vat-es first. | syntexa.ch | - | $0.006 | listed |
| Check Vat Fi API Call when an agent needs whether a FI VAT checksum is valid. No registry lookup. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/check-vat-fi first. | syntexa.ch | - | $0.004 | listed |
| Check Vat Fr API Call when an agent needs whether a FR VAT checksum is valid. No registry lookup. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/check-vat-fr first. | syntexa.ch | - | $0.007 | listed |
| Check Vat Gb API Call when an agent needs whether a GB VAT checksum is valid. No registry lookup. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/check-vat-gb first. | syntexa.ch | - | $0.006 | listed |
| Check Vat Hr API Call when an agent needs whether a HR VAT checksum is valid. No registry lookup. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/check-vat-hr first. | syntexa.ch | - | $0.004 | listed |
| Check Vat Hu API Call when an agent needs whether a HU VAT checksum is valid. No registry lookup. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-vat-hu first. | syntexa.ch | - | $0.008 | listed |
| Check Vat It API Call when an agent needs whether a IT VAT checksum is valid. No registry lookup. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-vat-it first. | syntexa.ch | - | $0.005 | listed |
| Check Vat Nl API Call when an agent needs whether a NL VAT checksum is valid. No registry lookup. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-vat-nl first. | syntexa.ch | - | $0.008 | listed |
| Check Vat Pl API Call when an agent needs whether a PL VAT checksum is valid. No registry lookup. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/check-vat-pl first. | syntexa.ch | - | $0.001 | listed |
| Check Vat Pt API Call when an agent needs whether a PT VAT checksum is valid. No registry lookup. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/check-vat-pt first. | syntexa.ch | - | $0.007 | listed |
| Check Vat Ro API Call when an agent needs whether a RO VAT checksum is valid. No registry lookup. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/check-vat-ro first. | syntexa.ch | - | $0.002 | listed |
| Check Vat Se API Call when an agent needs whether a SE VAT checksum is valid. No registry lookup. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/check-vat-se first. | syntexa.ch | - | $0.002 | listed |
| Check Vat Si API Call when an agent needs whether a SI VAT checksum is valid. No registry lookup. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-vat-si first. | syntexa.ch | - | $0.009 | listed |
| Check Vat Sk API Call when an agent needs whether a SK VAT checksum is valid. No registry lookup. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-vat-sk first. | syntexa.ch | - | $0.01 | listed |
| Check Whether A Domain Is Reachable And Healthy API Check whether a domain is reachable and healthy: DNS, certificate, redirects, security headers. One call on a domain: A, AAAA, NS, MX and SPF records; the TLS certificate with issuer, expiry and days left; the HTTP redirect chain hop by hop; and which security headers are present. Read from our infrastructure. Query… |  x-402.online | - | $0.005 | listed |
| Check a date Check whether a specific date is a public holiday in a country (optionally by state/region). |  openverbs.com | - | $0.002 | listed |
| Check backlinks for a domain via CommonCrawl and Google search. Returns linking domains, anchor text, dofollow/nofollow counts. Check backlinks for a domain via CommonCrawl and Google search. Returns linking domains, anchor text, dofollow/nofollow counts. |  strale.io | - | $0.162 | listed |
| Check data quality with custom rules (email_format, range, pattern, etc.) or auto-detect issues. Returns quality score and field-level report. Algorithmic. Check data quality with custom rules (email_format, range, pattern, etc.) or auto-detect issues. Returns quality score and field-level report. Algorithmic. | strale.io | - | $0.0216 | listed |
| Check notification delivery status. Check notification delivery status. |  spraay.app | - | $0.002 | listed |
| Checklist API Task-specific Avid assistant-editor implementation and QC checklist grounded in PostOpz Framework Vol. 1. |  postopz.com | - | $0.35 | listed |
| Checks API SECONDED checks EVM transactions, permits, tokens, agent registrations and suspicious messages before you sign or act. Two rival-lab models must agree; NOT VERIFIED means pause or ask a human. Choose a product and submit its exact input. A paid answer is a signed check, not a guarantee. |  secondedoracle.xyz | - | $0.25 | listed |
| Checks API Fetch a public URL once, right now, and evaluate a condition against it (keyword, CSS selector, JSON path, price threshold, content hash, or HTTP status). Returns matched:true/false with the extracted value and a short evidence excerpt. Synchronous; typical response under 3 seconds. $0.01 per check. |  vimabrosta.com | - | $0.01 | listed |
| Checks If A URL Supports A Claim API Checks if a URL supports a claim. Returns confidence score. Research agents use this to verify sources. |  thirdmade.net | - | $0.01 | listed |
| Checksum Adler32 Dec API Call when an agent needs a adler32 checksum of text as dec. No network and no LLM. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/checksum-adler32-dec first. | syntexa.ch | - | $0.01 | listed |
| Checksum Adler32 Hex API Call when an agent needs a adler32 checksum of text as hex. No network and no LLM. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/checksum-adler32-hex first. | syntexa.ch | - | $0.009 | listed |
| Checksum Crc16 Ccitt Dec API Call when an agent needs a crc16-ccitt checksum of text as dec. No network and no LLM. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc16-ccitt-dec first. | syntexa.ch | - | $0.004 | listed |
| Checksum Crc16 Ccitt Hex API Call when an agent needs a crc16-ccitt checksum of text as hex. No network and no LLM. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc16-ccitt-hex first. | syntexa.ch | - | $0.003 | listed |
| Checksum Crc16 Dec API Call when an agent needs a crc16 checksum of text as dec. No network and no LLM. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc16-dec first. | syntexa.ch | - | $0.002 | listed |
| Checksum Crc16 Hex API Call when an agent needs a crc16 checksum of text as hex. No network and no LLM. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc16-hex first. | syntexa.ch | - | $0.001 | listed |
| Checksum Crc32 Dec API Call when an agent needs a crc32 checksum of text as dec. No network and no LLM. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc32-dec first. | syntexa.ch | - | $0.006 | listed |
| Checksum Crc32 Hex API Call when an agent needs a crc32 checksum of text as hex. No network and no LLM. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc32-hex first. | syntexa.ch | - | $0.005 | listed |
| Checksum Crc32c Dec API Call when an agent needs a crc32c checksum of text as dec. No network and no LLM. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc32c-dec first. | syntexa.ch | - | $0.008 | listed |
| Checksum Crc32c Hex API Call when an agent needs a crc32c checksum of text as hex. No network and no LLM. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc32c-hex first. | syntexa.ch | - | $0.007 | listed |
| Checksum Fletcher16 Dec API Call when an agent needs a fletcher16 checksum of text as dec. No network and no LLM. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher16-dec first. | syntexa.ch | - | $0.006 | listed |
| Checksum Fletcher16 Hex API Call when an agent needs a fletcher16 checksum of text as hex. No network and no LLM. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher16-hex first. | syntexa.ch | - | $0.005 | listed |
| Checksum Fletcher32 Dec API Call when an agent needs a fletcher32 checksum of text as dec. No network and no LLM. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher32-dec first. | syntexa.ch | - | $0.008 | listed |
| Checksum Fletcher32 Hex API Call when an agent needs a fletcher32 checksum of text as hex. No network and no LLM. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher32-hex first. | syntexa.ch | - | $0.007 | listed |