| 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 |
| Chemical equations Given a reaction and the supplied amount of every reactant, identify the limiting reagent and compute leftover reactant and theoretical product yields. | openverbs.com | - | $0.004 | listed |
| Chess.com Player Ratings And Record API Chess.com player ratings and record: current, best and lowest across blitz, bullet, rapid and daily with W/L/D counts, plus tactics and puzzle rush bests. Pass a username. Keyless. |  suverse.io | - | $0.08 | listed |
| Chicago Building Violations Does this Chicago address have open building code violations? Query any street address in Chicago, Illinois and get recent DOB building violations with codes, status, and inspector comments. For tenant screening, landlord diligence, and lending checks. Input: address string. Output: JSON, live City of Chicago open data. Note: citywide rental-license registry is not published as a single open feed. |  onrender.com | - | $0.01 | listed |