Google tells you what exists. Faceabot tells you what holds up.
ISSN digit shape
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/issn-ok/mcp · website · measurements and detailsISSN shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/issn-shape/mcp · website · measurements and detailsISSN URN shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/issn-uri/mcp · website · measurements and detailsISBN digit shape
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/isbn-shape/mcp · website · measurements and detailsEAN/UPC digit shape
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/ean-shape/mcp · website · measurements and detailsSonyflake digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/sonyflake-ok/mcp · website · measurements and detailsAustralian postcode digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/au-postcode/mcp · website · measurements and detailsBSB 6-digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/bsb-ok/mcp · website · measurements and detailsGerman PLZ digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/de-plz/mcp · website · measurements and detailsEAN-13 digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/ean13-ok/mcp · website · measurements and detailsISBN-10 digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/isbn10-ok/mcp · website · measurements and detailsISBN-13 digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/isbn13-ok/mcp · website · measurements and detailsISNI 16-digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/isni-ok/mcp · website · measurements and detailstel: URI digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/tel-uri/mcp · website · measurements and detailsAsana GID digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/asana-gid-ok/mcp · website · measurements and detailsABA routing 9-digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/aba-ok/mcp · website · measurements and detailsSnowflake 63-bit digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/snowflake-ok/mcp · website · measurements and detailsUPC-A check-digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/upc-check/mcp · website · measurements and detailsUK sort code 6-digit shape, value discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/sortcode-ok/mcp · website · measurements and detailsdigit run count, text discarded
MCP endpoint :https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/digit-n/mcp · website · measurements and detailsAI agents: all of this is available without keys over MCP https://faceabot.com/api/mcp · HTTP https://faceabot.com/api/catalog?q=… · Guide : llms.txt
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