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Usefulapi MCP Server

by M190
Developer ToolsModerate7.5MCP RegistryLocalRemote
Free

Server data from the Official MCP Registry

Read Buttondown subscribers, emails, analytics and automations; add subscribers; write email drafts.

About

Read Buttondown subscribers, emails, analytics and automations; add subscribers; write email drafts.

Remote endpoints: streamable-http: https://buttondown.usefulapi.io/mcp

Security Report

7.5
Moderate7.5Low Risk

The provided files are a documentation README and a static-site build script (build.mjs) that reads local legal markdown and a manifest and writes HTML output. No data exfiltration, shell execution, or hardcoded credentials appear in the visible code, but the actual hosted MCP server implementations and the truncated remainder of build.mjs were not provided, so server-side auth and tool behavior could not be verified.

2 files analyzed · 3 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

File System Read

Reads files on your machine. Normal for tools that analyze or process local data.

File System Write

Writes or modifies files on your machine. Check that this is expected for the tool.

How to Install & Connect

Available as Local & Remote

This plugin can run on your machine or connect to a hosted endpoint. during install.

Documentation

View on GitHub

From the project's GitHub README.

usefulapi

Hosted MCP servers for the tools you already use — connect from Claude, Cursor, or any MCP client. No local install, no key-juggling: authorize once and go.

Portal: https://usefulapi.io

Servers

ServerCategoryToolsAuthDocs
Ablyrealtime19API tokenservers/ably/
Acceloproject-management27API tokenservers/accelo/
Acuity Schedulingcalendar22API tokenservers/acuity-scheduling/
Aircallcommunications29API tokenservers/aircall/
All Quietobservability15API tokenservers/all-quiet/
Amberflousage-metering18API tokenservers/amberflo/
Anvildocuments14API tokenservers/anvil/
Api2Pdfdocuments20API tokenservers/api2pdf/
api.videovideo-hosting19API tokenservers/apivideo/
Autumnbilling22API tokenservers/autumn/
Bannerbearimage-generation19API tokenservers/bannerbear/
Basis Theorypayments21API tokenservers/basis-theory/
Bettermodemembership12API tokenservers/bettermode/
Better Stackobservability13API tokenservers/betterstack/
Birdcommunications20API tokenservers/bird/
Braintreepayments11API tokenservers/braintree/
Canvas Medicalhealthcare8API tokenservers/canvas-medical/
Castlefraud-detection18API tokenservers/castle/
Censusanalytics17API tokenservers/census/
Chargebeebilling17API tokenservers/chargebee/
Checklyobservability26API tokenservers/checkly/
Checkout.compayments22API tokenservers/checkoutcom/
ClickUpproject-management18API tokenservers/clickup/
ClinicalTrials.govhealth-data11API tokenservers/clinicaltrialsgov/
Clinikohealthcare21API tokenservers/cliniko/
Codatfinancial-data32API tokenservers/codat/
Codecovdevops28API tokenservers/codecov/
Codemagicdevops13API tokenservers/codemagic/
Coppercrm26API tokenservers/copper/
Cronitorobservability10API tokenservers/cronitor/
Cronofycalendar12API tokenservers/cronofy/
Crowdinlocalization16API tokenservers/crowdin/
Customer.iomarketing17API tokenservers/customerio/
DailyMedhealth-data16API tokenservers/dailymed/
DeepInfraai-infra22API tokenservers/deepinfra/
DNSimpledns16API tokenservers/dnsimple/
DocRaptordocuments8API tokenservers/docraptor/
Documensoesignature20API tokenservers/documenso/
DrChronohealthcare19API tokenservers/drchrono/
Dropbox Signesignature14API tokenservers/dropbox-sign/
Drupaldocuments11API tokenservers/drupal/
Dubdevtools26API tokenservers/dub/
EasyPostshipping15API tokenservers/easypost/
Ecwidecommerce16API tokenservers/ecwid/
EmailOctopusemail17API tokenservers/emailoctopus/
Estuary Flowdevops19API tokenservers/estuary-flow/
fal.aiimage-generation11API tokenservers/falai/
Finnhubfinancial-data19API tokenservers/finnhub/
Fireworks AIai-infra18API tokenservers/fireworks/
Fitbithealth-data21API tokenservers/fitbit/
Folkcrm18API tokenservers/folk/
Formbricksproductivity21API tokenservers/formbricks/
Foxy.ioecommerce18API tokenservers/foxyio/
Freshdesksupport23API tokenservers/freshdesk/
Geoapifymaps12API tokenservers/geoapify/
GetResponsemarketing18API tokenservers/getresponse/
GitBookdocuments18API tokenservers/gitbook/
Groovecommunications20API tokenservers/groove-hq/
Gumroadecommerce24API tokenservers/gumroad/
Harvestproject-management24API tokenservers/harvest/
Health Gorillahealth-data20API tokenservers/health-gorilla/
Healthchecks.ioobservability16API tokenservers/healthchecksio/
Healthiehealthcare20API tokenservers/healthie/
HelpCrunchsupport16API tokenservers/helpcrunch/
Hetzner Cloudcloud36API tokenservers/hetzner-cloud/
Hypertunefeature-flags9API tokenservers/hypertune/
Increasefintech22API tokenservers/increase/
Infermedicahealthcare21API tokenservers/infermedica/
Inngestdev-infra15API tokenservers/inngest/
Instatusobservability18API tokenservers/instatus/
Keapmarketing22API tokenservers/keap/
Kindesecurity27API tokenservers/kinde/
Knackno-code-database13API tokenservers/knack/
KnowledgeOwlknowledge-base28API tokenservers/knowledgeowl/
Lagobilling28API tokenservers/lago/
Lambda Labsai-infra19API tokenservers/lambda-labs/
Laravel Forgedevops21API tokenservers/laravel-forge/
Lemon Squeezypayments22API tokenservers/lemonsqueezy/
Linearproject-management12OAuthservers/linear/
Lobdirect-mail22API tokenservers/lob/
Loopsemail14API tokenservers/loops/
MagicBellnotifications17API tokenservers/magicbell/
Mailchimpemail22API tokenservers/mailchimp/
MailerLiteemail17API tokenservers/mailerlite/
MapTilermaps12API tokenservers/maptiler/
MaxMind minFraudfraud-detection8API tokenservers/maxmind-minfraud/
Memberfulmembership16API tokenservers/memberful/
Mercoapayments21API tokenservers/mercoa/
Metriporthealthcare16API tokenservers/metriport/
Mindeedocument-ai8API tokenservers/mindee/
Missivecommunications23API tokenservers/missive/
Mistralai-infra19API tokenservers/mistral/
Mixpanelanalytics11API tokenservers/mixpanel/
Modern Treasurypayment-operations21API tokenservers/modern-treasury/
NexHealthhealthcare20API tokenservers/nexhealth/
Nomic Atlasai-infra13API tokenservers/nomic-atlas/
Northflankdevops21API tokenservers/northflank/
NPPES NPI Registryhealth-data8API tokenservers/nppes-npi-registry/
Numeraltax15API tokenservers/numeral/
Nylasemail19API tokenservers/nylas/
Onfidofraud-detection18API tokenservers/onfido/
openFDAhealth-data18API tokenservers/openfda/
OpenPhonecommunications20API tokenservers/openphone/
Orbbilling30API tokenservers/orb/
Ourahealth-data14API tokenservers/oura/
OwnerRezmembership29API tokenservers/ownerrez/
Parabolproject-management25API tokenservers/parabol/
Particle Healthhealth-data15API tokenservers/particlehealth/
People Data Labsdata-enrichment12API tokenservers/peopledatalabs/
Personafraud-detection18API tokenservers/persona/
Pipedrivecrm23API tokenservers/pipedrive/
Plausibleanalytics12API tokenservers/plausible-analytics/
Polarbilling30API tokenservers/polar-sh/
Portkeyai-infra20API tokenservers/portkey/
Printifyecommerce18API tokenservers/printify/
Quadernotax27API tokenservers/quaderno/
Raiselyfundraising27API tokenservers/raisely/
Re:amazesupport21API tokenservers/re-amaze/
Rechargeecommerce19API tokenservers/recharge/
Reclaim.aicalendar19API tokenservers/reclaimai/
Recurlybilling12API tokenservers/recurly/
Release Radardevops9API tokenservers/release-radar/
RxNormhealth-data17API tokenservers/rxnorm/
SavvyCalcalendar12API tokenservers/savvycal/
Scalingopaas25API tokenservers/scalingo/
Sendbirdchat18API tokenservers/sendbird/
SendGridemail15API tokenservers/sendgrid/
SimpleTextingcommunications15API tokenservers/simpletexting/
Speechmaticsspeech-to-text11API tokenservers/speechmatics/
Spike.shobservability20API tokenservers/spikesh/
Squadcastobservability20API tokenservers/squadcast/
StatusPalobservability15API tokenservers/statuspal/
Streamchat17API tokenservers/stream/
Svixdev-infra23API tokenservers/svix/
Swellecommerce20API tokenservers/swell/
Tailscaledevops26API tokenservers/tailscale/
Text-Em-Allcommunications18API tokenservers/text-em-all/
Trigger.devdev-infra26API tokenservers/trigger-dev/
Twentycrm24API tokenservers/twenty/
Unkeysecurity23API tokenservers/unkey/
Uploadcareimage-cdn15API tokenservers/uploadcare/
Vitalhealth-data25API tokenservers/vital/
WHOOPhealth-data14API tokenservers/whoop/
YouCanBook.mecalendar22API tokenservers/youcanbookme/
Zendesksupport23API tokenservers/zendesk/
Filloutproductivity13API tokenservers/fillout/
Checkfrontcalendar24API tokenservers/checkfront/
Breeze ChMSmembership28API tokenservers/breeze-chms/
Neon CRMfundraising26API tokenservers/neon-crm/
Insightlycrm25API tokenservers/insightly/
Bookeocalendar25API tokenservers/bookeo/
Bloomerangfundraising24API tokenservers/bloomerang/
Together AIai-infra27API tokenservers/together-ai/
Eventbriteecommerce30API tokenservers/eventbrite/
Less Annoying CRMcrm27API tokenservers/less-annoying-crm/
Workizproductivity23API tokenservers/workiz/
Depotdevops26API tokenservers/depot/
Mindbodycalendar24API tokenservers/mindbody/
Buildiumproductivity27API tokenservers/buildium/
Housecall Proproductivity29API tokenservers/housecall-pro/
Hostawaycalendar24API tokenservers/hostaway/
Invoice Ninjabilling28API tokenservers/invoice-ninja/
Aterasupport24API tokenservers/atera/
Beds24productivity22API tokenservers/beds24/
Booqableecommerce25API tokenservers/booqable/
Boulevardproductivity25API tokenservers/boulevard/
bunny.netdev-infra26API tokenservers/bunny-net/
Civocloud26API tokenservers/civo/
Current RMSproductivity24API tokenservers/current-rms/
Deputyproductivity25API tokenservers/deputy/
Deskprosupport24API tokenservers/deskpro/
Elvantomembership27API tokenservers/elvanto/
Follow Up Bosscrm26API tokenservers/follow-up-boss/
Formstackproductivity24API tokenservers/formstack/
TeamUpmembership24API tokenservers/goteamup/
HappyFoxsupport27API tokenservers/happyfox/
Hostfullyproductivity24API tokenservers/hostfully/
Humanitixecommerce19API tokenservers/humanitix/
IntakeQhealthcare23API tokenservers/intakeq/
JobNimbuscrm24API tokenservers/jobnimbus/
Kayakosupport25API tokenservers/kayako/
Kickservproductivity24API tokenservers/kickserv/
LearnWorldsmembership24API tokenservers/learnworlds/
Little Green Lightfundraising24API tokenservers/little-green-light/
Loyverseecommerce25API tokenservers/loyverse/
Momencecalendar27API tokenservers/momence/
Moosendemail24API tokenservers/moosend/
OfficeRnDproductivity24API tokenservers/officernd/
OptimoRouteshipping19API tokenservers/optimoroute/
Paymoproject-management25API tokenservers/paymo/
Printfulecommerce24API tokenservers/printful/
Recruiteeproductivity26API tokenservers/recruitee/
Rewardfulmarketing24API tokenservers/rewardful/
sevdeskbilling24API tokenservers/sevdesk/
Shopmonkeyproductivity27API tokenservers/shopmonkey/
Smile.ioecommerce18API tokenservers/smile-io/
Smoobuproductivity24API tokenservers/smoobu/
Sortlyproductivity24API tokenservers/sortly/
StatusCakeobservability25API tokenservers/statuscake/
Titoecommerce24API tokenservers/tito/
Trengosupport28API tokenservers/trengo/
Unleashed Softwareecommerce24API tokenservers/unleashed-software/
UpCloudcloud26API tokenservers/upcloud/
updown.ioobservability18API tokenservers/updown-io/
Virtuousfundraising24API tokenservers/virtuous-crm/
When I Workproductivity25API tokenservers/when-i-work/
Wild Apricotmembership25API tokenservers/wild-apricot/
Wufooproductivity22API tokenservers/wufoo/
Lightspeed Retail (R-Series)ecommerce21OAuthservers/lightspeed-r-series/
FreeAgentbilling24OAuthservers/freeagent/
Airbrakeobservability17API tokenservers/airbrake/
ChurchSuitecrm29API tokenservers/churchsuite/
Cin7 Coreecommerce21API tokenservers/cin7-core/
Connecteamproductivity23API tokenservers/connecteam/
Gingrproductivity29API tokenservers/gingr/
Kisisecurity24API tokenservers/kisi/
Lexware Officebilling25API tokenservers/lexware-office/
Nookalhealthcare15API tokenservers/nookal/
Ordoroshipping22API tokenservers/ordoro/
Photon Healthhealthcare25API tokenservers/photon-health/
RotaCloudproductivity30API tokenservers/rotacloud/
Shiftbaseproductivity26API tokenservers/shiftbase/
Shipdayshipping18API tokenservers/shipday/
SlickTextcommunications28API tokenservers/slicktext/
Spruce Healthhealthcare28API tokenservers/spruce-health/
TalentLMSproductivity27API tokenservers/talentlms/
Teachworksproductivity28API tokenservers/teachworks/
Textlinecommunications27API tokenservers/textline/
Tookanshipping19API tokenservers/tookan/
Track-PODshipping20API tokenservers/track-pod/
Veeqoecommerce26API tokenservers/veeqo/
Clockifyproject-management25API tokenservers/clockify/
Gelatoecommerce23API tokenservers/gelato/
Fathom Analyticsanalytics20API tokenservers/fathom-analytics/
Paperformproductivity27API tokenservers/paperform/
UserVoicesupport25API tokenservers/uservoice/
Breathe HRproductivity29API tokenservers/breathe-hr/
Rev.aispeech-to-text12API tokenservers/rev-ai/
Enchantsupport20API tokenservers/enchant/
Pirsch Analyticsanalytics31API tokenservers/pirsch/
Exoscalecloud30API tokenservers/exoscale/
Pipeline CRMcrm34API tokenservers/pipeline-crm/
Teamgatecrm38API tokenservers/teamgate/
Homebaseproductivity20API tokenservers/homebase/
Benchmark Emailemail29API tokenservers/benchmark-email/
eDesksupport22API tokenservers/edesk/
Enchargeemail14API tokenservers/encharge/
Sendlaneemail35API tokenservers/sendlane/
Simple Analyticsanalytics10API tokenservers/simple-analytics/
Hint Healthhealthcare21API tokenservers/hint-health/
Elation Healthhealthcare18API tokenservers/elation-health/
Akute Healthhealthcare19API tokenservers/akute-health/
Practice Betterhealthcare19API tokenservers/practice-better/
Docparserdocument-ai13API tokenservers/docparser/
Vyfakturujbilling14API tokenservers/vyfakturuj/
Invoicedbilling31API tokenservers/invoiced/
Billomatbilling38API tokenservers/billomat/
ChargeOverbilling29API tokenservers/chargeover/
TrackingMoreshipping11API tokenservers/trackingmore/
NodePingobservability32API tokenservers/nodeping/
MailBlusteremail17API tokenservers/mailbluster/
Gift Up!ecommerce17API tokenservers/gift-up/
FireTextcommunications17API tokenservers/firetext/
Megaventoryecommerce24API tokenservers/megaventory/
REVIEWS.ioecommerce20API tokenservers/reviews-io/
Voodoo SMScommunications17API tokenservers/voodoo-sms/
Eventzillaproductivity15API tokenservers/eventzilla/
Finale Inventoryecommerce17API tokenservers/finale-inventory/
ClassMarkerproductivity19API tokenservers/classmarker/
SupportBeesupport26API tokenservers/supportbee/
Tokeetproductivity28API tokenservers/tokeet/
Inventory Plannerecommerce15API tokenservers/inventory-planner/
Tickproductivity18API tokenservers/tick/
SIGNL4observability22API tokenservers/signl4/
SpinupWPdevops23API tokenservers/spinupwp/
Synchroteamproductivity37API tokenservers/synchroteam/
Dead Man's Snitchobservability12API tokenservers/dead-mans-snitch/
WhatConvertsmarketing19API tokenservers/whatconverts/
AddEventcalendar22API tokenservers/addevent/
Helpwisesupport25API tokenservers/helpwise/
Qgivfundraising25API tokenservers/qgiv/
Starshipitshipping23API tokenservers/starshipit/
Buttondownemail29API tokenservers/buttondown/
SuperFakturabilling29API tokenservers/superfaktura/
Accredibleproductivity23API tokenservers/accredible/
Winchermarketing26API tokenservers/wincher/
Waitwhilecalendar33API tokenservers/waitwhile/
Doxis AI.dp (Klippa DocHorizon)document-ai34API tokenservers/klippa-dochorizon/
TinyURLmarketing12API tokenservers/tinyurl/
Spoke Dispatchshipping27API tokenservers/spoke-dispatch/
RunClouddevops40API tokenservers/runcloud/
Status.ioobservability24API tokenservers/status-io/
Fleetioproductivity48API tokenservers/fleetio/
deSECdns11API tokenservers/desec/
Messentecommunications13API tokenservers/messente/
Localazylocalization21API tokenservers/localazy/
Adafruit IOproductivity21API tokenservers/adafruit-io/
NS1dns22API tokenservers/ns1/
BulkSMScommunications12API tokenservers/bulksms/
Taggundocument-ai10API tokenservers/taggun/
D7 Networkscommunications10API tokenservers/d7-networks/
CraftMyPDFdocument-ai15API tokenservers/craftmypdf/
Billybilling19API tokenservers/billy/
APITemplate.iodocument-ai14API tokenservers/apitemplate/
ApiFlashdevops7API tokenservers/apiflash/
Merit Aktivabilling30API tokenservers/merit-aktiva/
Homerunproductivity13API tokenservers/homerun/
17TRACKshipping13API tokenservers/17track/
Kinstadevops27API tokenservers/kinsta/
rapidmailemail20API tokenservers/rapidmail/
smsmodecommunications17API tokenservers/smsmode/
Zammadsupport23API tokenservers/zammad/
TinyPNGimage-cdn8API tokenservers/tinypng/
WakaTimedevtools27API tokenservers/wakatime/
e-Boekhoudenbilling29API tokenservers/e-boekhouden/
Weblatelocalization27API tokenservers/weblate/
SmartBillbilling27API tokenservers/smartbill/
packageclouddevops22API tokenservers/packagecloud/
Cuttlymarketing10API tokenservers/cuttly/
Beacon CRMfundraising15API tokenservers/beacon-crm/
Emailableemail8API tokenservers/emailable/
Teamup Calendarcalendar19API tokenservers/teamup-calendar/
Fieldwireproject-management26API tokenservers/fieldwire/
CashCtrlbilling32API tokenservers/cashctrl/
Zenserpanalytics23API tokenservers/zenserp/
Bill4Timebilling12API tokenservers/bill4time/
Notifyrecommunications25API tokenservers/notifyre/
Lessonspaceproductivity13API tokenservers/lessonspace/
Számlázz.hubilling15API tokenservers/szamlazz-hu/
Abstract APIanalytics18API tokenservers/abstract-api/
Obliobilling22API tokenservers/oblio/
SmartAccountsbilling22API tokenservers/smartaccounts/
Propstackcrm22API tokenservers/propstack/

More servers land here as they launch — each is a folder with its own README + server.json, and a tile on the portal.

What's in each folder

  • README.md — what the server does, tools, pricing, the "Add to Claude" snippet
  • server.json — the official MCP Registry record (namespace io.usefulapi/*), pointing at the hosted endpoint

License

MIT — see LICENSE. Documentation only; servers are hosted.

Reviews

No reviews yet

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