Toolcall
not read yet
Use
- For
- Developers and AI agents calling pay-per-call data and lookup APIs over HTTP
- Runs as
- API
- Used for
- check a domain's registration age and mail setup
- verify email deliverability without sending any mail
- fetch chemical hazard data by CAS number
- Has an MCP server (1 in the registry)public registry →
- Publishes llms.txt, a file written for AI assistantstoolcall.click ↗
- MCP serverclick.toolcall/toolcallverified in the MCP registry
- Stateanswers, 20 toolschecked 2026-10-23
- Address to connecttoolcall.click/mcp
- OpenAPI spec20 pathsthe spec ↗
This card as JSON, for your agent →
Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.
Figure and bar: visits/mo, estimate · year: online since
- #1
APITier
Connects AI agents to production APIs for address validation, lead scoring, and fraud detection across 120 countries.
1.6kMaintainedFrom $9/mo - #2
Verifox AIMCP · open
Checks email addresses for syntax, domain records, live mail-server handshake, disposable and catch-all status, returning a valid, risky or invalid verdict.
1.1kActiveFrom $9 once - #3
UptyBotsMCP · open
Checks websites, APIs, SSL certificates, domains and ports from global nodes and lets MCP-connected AI assistants create and inspect monitors.
366ActiveFrom $4.99/mo - #4
SMTPfastMCP · sign-in
Sends transactional email over a REST API or SMTP bridge and traces each send, bounce, open and webhook event per email.
133ActiveFrom $9/mo - #5
AgenteryMCP · open
Tracks and compares price changes across AI agent services and MCP servers, offering a daily price index and plan comparisons.
17Active - #6
SkinwinkingMCP · open
Pay-per-request USDC API for trading agents, serving order book imbalance, token authority risk audits and swap routing quotes.
7
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betaThree tools from the Atlas for the job you describe, each with what fits and what does not.
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Sign in to leave a noteWhat is Toolcall?
Pay-per-call HTTP APIs, paid in USDC on Base via x402, offering crypto gas prices, FX rates, domain and email checks, and chemical safety lookups. It is listed in the Atlas under Developer tools.
Who is Toolcall for?
Developers and AI agents calling pay-per-call data and lookup APIs over HTTP
Do people use Toolcall?
Little sign of use.
What are alternatives to Toolcall?
In Developer tools, by use: APITier, Verifox AI, UptyBots, SMTPfast, Agentery, Skinwinking.
How we read a tool
No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.
- Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
- Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
- Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
- The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.
How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.
How we read every tool → · By INITE Atlas Desk
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