CallNode (callnode.io, operated by Mobiiworx Inc.) provides phone numbers as infrastructure for voice AI: it connects phone calls and texts to AI agents and automation workflows such as CrewAI, LiveKit, n8n, Flowise or any native webhook. Developers provision a number, point it at a webhook or WebSocket, and handle real voice, SMS and MMS traffic across US and Canada coverage with pay-as-you-go pricing, plus SIP trunking, email, fax, test mode, an MCP integration for Claude and ChatGPT, and a wholesale offering for service providers.
CallNode publishes 8 API contracts indexed on the APIs.io network, including Call Records API, Email API, Faxes API, and 5 more. Tagged areas include Company, Voice AI, Telephony, Phone Numbers, and SMS.
The CallNode catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.
CallNode’s developer surface includes changelog, sandbox, authentication, documentation, API reference, getting-started guide, pricing, and 46 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Telecommunications regime, so
Regulatory Posture carries 15 points of the composite.
If this regime is wrong for your business, say so on your
provider repo — the
applicability map is public and we will correct it.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for
this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero:
never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and
several others — scorable at all.
The six quality facets above are damped to 85 points between them,
because the conditional facet above carries the other
15. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 85% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
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Agent readiness — checks not met, largest first (exact, from this profile):
MCP Server+12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Machine-Readable Auth+10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency+9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics+8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card+8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples+7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
9 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
Programmable email: verify a sending domain you control, send transactional email from any address on it, list messages, and receive delivery events (delivered, delayed, bounced...
Hosted fax: send a PDF or TIFF as a fax, list and retrieve faxes sent and received on your numbers, download the document, delete it. Billed per page for the pages actually tran...
Wholesale (SBC-as-a-Service) DID ordering — US and international numbers delivered straight to your SIP endpoint. Requires wholesale to be active on your account and completed b...
CallNode hosts a remote Model Context Protocol server at https://mcp.callnode.io/mcp (Streamable HTTP) that lets an AI assistant read call and message history, send texts, place...
Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.
Yes. APIs.io lists 8 APIs from CallNode, including CallNode Call Records API, CallNode Email API and CallNode Faxes API, and 5 more.
Is there an OpenAPI specification for the CallNode API?
Yes. APIs.io indexes 8 OpenAPI specifications for CallNode, each linked for download from this page.
How do I authenticate with the CallNode API?
CallNode documents its authentication (apiKey · 3 schemes). The details are profiled on APIs.io as Callnode Io Authentication.
How much does the CallNode API cost?
APIs.io lists 3 pricing plans for CallNode, with each plan's price, limits and inclusions under Pricing on this page.
Does CallNode have an MCP server?
Yes. APIs.io lists 1 MCP server for CallNode: CallNode hosts a remote Model Context Protocol server at https://mcp.callnode.io/mcp (Streamable HTTP) that lets an AI assistant read call and message history, send texts, place calls with the CallNod
Is the CallNode API ready for AI agents?
CallNode has a Kin Score of 47.4 out of 100 (developing) and an Agent Readiness score of 25.2 (agent-aware), scored by API Evangelist on 2026-11-06.
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Kin Score
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