The request "Api" is too general to name one tool, so the candidates below are the most relevant API-related products by what their sources show: an email delivery API 1, a webhook delivery service 10, an exchange-rate data API 8, an API security scanner 3, an API documentation platform 4, and an API spec directory 5. Tell me which kind of API you need (for example sending email, receiving events, currency data, or securing your own APIs) and I can narrow this.
A question back: Which API do you need: for sending email, receiving webhooks, currency rates, securing your own APIs, documenting them, or finding APIs?
- 1
SendGrid Email APIsendgrid.comverified and signed
Sends transactional and marketing email through an API, now offered via Twilio 1.
official:API · Email Activity (beta)+12 community tools built for it
for agents: API · GET_api_keys · GET_api_keys-api_key_id
- 2
Svixsvix.comverified and signed
Sends and receives webhooks at scale with retries, signature verification and a managed dashboard 10.
for agents: create_endpoint_api_v1_app__app_id__endpoint__post · create_integration_api_v1_app__app_id__integration__post · create_application_api_v1_app__post
- 3
Rate-APIrate-api.comwebsite read, tools not yet checked
Provides exchange rates for 160+ currencies, with conversion and historical data, through a single key-authenticated API 8.
- 4
middleBrickmiddlebrick.comfound in code, not yet checked
Scans an API endpoint for OWASP and other security issues and returns a risk score 3.
+1 community tools built for it
for agents: scan_api · scan_api · list_scans
- 5
ReadMereadme.ioverified and signed
Creates interactive API documentation and manages API specifications 4.
official:API · API Endpoints+37 community tools built for it
for agents: getAPISpecification · updateAPISpecification · deleteAPISpecification
- 6
APIs.guruapis.guruverified and signed
Directory of public REST API specifications in OpenAPI 3.0 format, listing and retrieving them 5.
official:API · APIs.guru
for agents: getAPI · listAPIs · getServiceAPI
Sources
- 1SendGrid Email API and Email Marketing Campaigns | Twiliotwilio.com · read 2026-10-29
- 3Scan Any API. Security Score in 60 Seconds, Zero Setup | middleBrickmiddlebrick.com · read 2026-10-29
- 4ReadMe · Developer-friendly API documentationreadme.com · read 2026-10-29
- 5APIs.guru - Wikipedia for Web APIs | Api Directoryapis.guru · read 2026-10-29
- 8Rate-API — Free Exchange Rate API for 160+ Currenciesrate-api.com · read 2026-10-29
- 10Webhooks as a Service – Secure and Enterprise Ready · Svixsvix.com · read 2026-10-29
For agents: the 10 actions behind this answer
API · python-http-client verified and signed
· API Evangelist website read, tools not yet checked
Studying the technology, business, and politics of APIs since 2010.
scan_api · middleBrick found in code, not yet checked
Scan an API endpoint for security vulnerabilities and get a risk score
getAPISpecification · API Endpoints verified and signed
Get API specification metadata
getAPI · APIs.guru verified and signed
Retrieve one version of a particular API
· API Market website read, tools not yet checked
API Marketplace trusted by 18,800+ developers, where you can buy and sell APIs. Discover Flight APIs, Face Swap, Text-to-Video APIs, marketing automation tools, integrations, and more!
Search the API catalog · APIs.io verified and signed
Federated search across API providers, APIs and tags in one call, with match counts. Filter by tag, artifact type, industry, region or rating band. Free, no key required. e.g. Find payment APIs with an OpenAPI and an MCP server e.g. Which providers in insurance publish machine-readable rate limits?
· Rate-API website read, tools not yet checked
Exchange rate API for 160+ currencies, checked hourly, with conversion, historical data and crypto. Free tier, simple key auth, JSON/XML/CSV.
· Rapidapi website read, tools not yet checked
Explore your APIs
create_endpoint_api_v1_app__app_id__endpoint__post · Svix API verified and signed
Create Endpoint
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.