Zelto

Zelto AI provides production QA for voice AI agents, offering analytics and monitoring of conversational pipelines. It ingests calls, transcripts, messages, and LLM traces to surface failures, rank findings, and draft fixes, helping teams improve conversion and reliability at scale. The platform integrates with major voice AI services and offers a dashboard for debugging, testing, and continuous improvement.

Zelto publishes 11 API contracts indexed on the APIs.io network, including Action checks API, Agents API, Buckets API, and 8 more. Tagged areas include Company, Voice AI, QA, Production, and Analytics.

The Zelto catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Zelto’s developer surface includes pricing, signup flow, getting-started guide, authentication, documentation, API reference, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

48.8/100 developing ▼ -5.9 Agent 42/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 4 Agent Skills

Company Voice AI QA Production Analytics Monitoring

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Agent Infrastructure & Agentic Commerce

AE-100

ConversationsFindings

GET /v1/findings GET /v1/findings/{id} GET /v1/findings/{id}/conversations

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 48.8/100 · developing

Contract Quality 11.7 / 19

Developer Ergonomics 4.2 / 15

Access Clarity 5.9 / 15

Operational Transparency 1.0 / 10

Contract Governance 3.2 / 9

Discoverability 5.5 / 8

Regulatory Posture 3.5 / 15

Create-or-Update Ergonomics 6.7 / 10

Agent readiness — 42/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 28.0 — up to +14.4 composite points
Access Clarity scores 39.5 — up to +12.1 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/zelto/apis.yml: open an issue on github.com/api-evangelist/zelto to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 3

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 11

Individual APIs this provider publishes, each with its own machine-readable definition.

Zelto Action checks API

The Action checks API from Zelto — 1 operation(s) for action checks.

Zelto Agents API

Voice and chat bots normalised through Zelto's ingestion pipeline.

Zelto Buckets API

Reviewer routing — group conversations for batched review.

Zelto Companies API

Clients or brands your agents work for, and their logos.

Zelto Conversations API

Calls, chats, and voicemails — plus their transcripts and recordings.

Zelto Customer Metrics API

Customer-provided evaluations attached to a call (requires metrics enabled).

Zelto Experiments API

Prospective measurement of two externally routed prompt versions across independent monitor outcomes.

Zelto Findings API

Structured issues discovered during analysis, with optional conversation attachments and comments.

Zelto Organizations API

Headless org provisioning. Requires an admin/service API key (not a read-only org-scoped customer key).

Zelto Reports API

The Reports API from Zelto — 3 operation(s) for reports.

Zelto Reviews API

Human review state for conversations.

Scroll for all 11

Agent Skills 4

Packaged agent skills for driving this provider's APIs from an AI assistant.

zelto-create-finding-with-conversation

AGENT SKILL

zelto-fetch-conversation-transcript

AGENT SKILL

zelto-launch-experiment

AGENT SKILL

zelto-list-and-get-agent

AGENT SKILL

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Zelto Context

21 classes · 93 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Zelto API Rules

56 rules · 47 errors 6 warnings 3 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

ActionCheckInput

5 properties

JSON SCHEMA

CallIngest

9 properties

JSON SCHEMA

CustomerMetric

13 properties

JSON SCHEMA

CustomerTransferReport

5 properties

JSON SCHEMA

ExperimentCreate

16 properties

JSON SCHEMA

Finding

10 properties

JSON SCHEMA

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Zelto Authentication

http · 1 scheme

SECURITY

Zelto Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Zelto Trust Center

SOC 2, ISO 27001, PCI DSS, HIPAA, GDPR

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Zelto Agentic Access

49 operations · 23 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 6

Authentication, authorization, and security posture

Compliance

SecurityTxt

SecurityTxt

Authentication

TrustCenter

DomainSecurity

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 1

The organization behind the API

Website

Website

Other 4

Properties that don't map to a standard resource type

CapabilityMap

AgentCard

Hosts

Vendors

Source (apis.yml)

aid: zelto
name: Zelto
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: gated
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://zelto.ai/opengraph-image?4d5829a62bee824e
description: Zelto AI provides production QA for voice AI agents, offering analytics and monitoring of conversational pipelines.
  It ingests calls, transcripts, messages, and LLM traces to surface failures, rank findings, and draft fixes, helping teams
  improve conversion and reliability at scale. The platform integrates with major voice AI services and offers a dashboard
  for debugging, testing, and continuous improvement.
url: https://raw.githubusercontent.com/api-evangelist/zelto/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-15 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-15'
modified: '2026-10-15'
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Company
- Voice AI
- QA
- Production
- Analytics
- Monitoring
tags_raw:
- Company
- VoiceAI
- QA
- Production
- Analytics
- Monitoring
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Pricing
  url: https://docs.zelto.ai/docs/plans
- type: CapabilityMap
  url: capabilities/zelto-capability-edges.yml
  name: Zelto Business Capability Map
- type: AgenticAccess
  url: agentic-access/zelto-agentic-access.yml
- type: Spectral
  url: rules/zelto-rules.yml
- type: JSONLD
  url: json-ld/zelto-context.jsonld
- type: Vocabulary
  url: vocabulary/zelto-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/zelto-data-model.yml
- type: Compliance
  url: https://trust.inc/zelto
- type: ErrorCatalog
  url: errors/zelto-problem-types.yml
- type: Conformance
  url: conformance/zelto-conformance.yml
- type: LLMsTxt
  url: llms/zelto-llms.txt
- type: AgentCard
  url: a2a/zelto-a2a.yml
- type: SecurityTxt
  url: well-known/zelto-dashboard-security.txt
- type: SecurityTxt
  url: well-known/zelto-api-security.txt
- type: WellKnown
  url: well-known/zelto-well-known.yml
- type: Hosts
  url: hosts/zelto-hosts.yml
- type: Vendors
  url: vendors/zelto-vendors.yml
- type: SignUp
  url: https://api.zelto.ai/signup
- type: GettingStarted
  url: https://docs.zelto.ai/docs/quickstart
- type: Authentication
  url: authentication/zelto-authentication.yml
- type: TrustCenter
  url: security/zelto-trust-center.yml
- type: DomainSecurity
  url: security/zelto-domain-security.yml
- type: Website
  url: https://zelto.ai
- type: Documentation
  url: https://docs.zelto.ai/api-reference
- type: APIReference
  url: https://docs.zelto.ai/api-reference
- type: PrivacyPolicy
  url: https://zelto.ai/privacy
- type: TermsOfService
  url: https://zelto.ai/terms
apis:
- aid: zelto:zelto-action-checks-api
  name: Zelto Action checks API
  description: The Action checks API from Zelto — 1 operation(s) for action checks.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Action checks
  properties:
  - type: OpenAPI
    url: openapi/zelto-action-checks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-agents-api
  name: Zelto Agents API
  description: Voice and chat bots normalised through Zelto's ingestion pipeline.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Agents
  properties:
  - type: OpenAPI
    url: openapi/zelto-agents-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-buckets-api
  name: Zelto Buckets API
  description: Reviewer routing — group conversations for batched review.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Buckets
  properties:
  - type: OpenAPI
    url: openapi/zelto-buckets-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-companies-api
  name: Zelto Companies API
  description: Clients or brands your agents work for, and their logos.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Companies
  properties:
  - type: OpenAPI
    url: openapi/zelto-companies-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-conversations-api
  name: Zelto Conversations API
  description: Calls, chats, and voicemails — plus their transcripts and recordings.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Conversations
  properties:
  - type: OpenAPI
    url: openapi/zelto-conversations-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-customer-metrics-api
  name: Zelto Customer Metrics API
  description: Customer-provided evaluations attached to a call (requires metrics enabled).
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Customer Metrics
  properties:
  - type: OpenAPI
    url: openapi/zelto-customer-metrics-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-experiments-api
  name: Zelto Experiments API
  description: Prospective measurement of two externally routed prompt versions across independent monitor outcomes.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Experiments
  properties:
  - type: OpenAPI
    url: openapi/zelto-experiments-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-findings-api
  name: Zelto Findings API
  description: Structured issues discovered during analysis, with optional conversation attachments and comments.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Findings
  properties:
  - type: OpenAPI
    url: openapi/zelto-findings-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-organizations-api
  name: Zelto Organizations API
  description: Headless org provisioning. Requires an admin/service API key (not a read-only org-scoped customer key).
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Organization
  tags_raw:
  - Organizations
  properties:
  - type: OpenAPI
    url: openapi/zelto-organizations-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-reports-api
  name: Zelto Reports API
  description: The Reports API from Zelto — 3 operation(s) for reports.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Reports
  properties:
  - type: OpenAPI
    url: openapi/zelto-reports-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
- aid: zelto:zelto-reviews-api
  name: Zelto Reviews API
  description: Human review state for conversations.
  humanURL: https://docs.zelto.ai/api-reference
  baseURL: https://api.zelto.ai
  tags:
  - Reviews
  properties:
  - type: OpenAPI
    url: openapi/zelto-reviews-api-openapi.yml
  - type: JSONSchema
    url: json-schema/zelto-call-ingest-schema.json
  - type: JSONSchema
    url: json-schema/zelto-experiment-create-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-transfer-report-schema.json
  - type: JSONSchema
    url: json-schema/zelto-action-check-input-schema.json
  - type: JSONSchema
    url: json-schema/zelto-customer-metric-schema.json
  - type: JSONSchema
    url: json-schema/zelto-finding-schema.json
x-submission-notes: Production QA for voice AI agents; REST API, llms.txt
x-submission-probe: root 200, api-reference 200, llms.txt 200 text, soft-404 OK
x-submitted-by: a@zelto.ai (email, 2026-10-15)
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-15'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://docs.zelto.ai/mcp
    status: null
  - url: https://api.zelto.ai/openapi.json
    status: null
  - url: https://dashboard.zelto.ai/openapi.json
    status: null
  - url: https://api.zelto.ai/mcp
    status: 401
  - url: https://dashboard.zelto.ai/mcp
    status: 401
  - url: https://trust.zelto.ai/mcp
    status: 403
x-enrichment:
  date: '2026-10-15'
  status: enriched
  artifacts_added: 37
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Zelto API — frequently asked questions

Does Zelto have an API?

Yes. APIs.io lists 11 APIs from Zelto, including Zelto Action checks API, Zelto Agents API and Zelto Buckets API, and 8 more.

Is there an OpenAPI specification for the Zelto API?

Yes. APIs.io indexes 11 OpenAPI specifications for Zelto, each linked for download from this page.

How do I authenticate with the Zelto API?

Zelto documents its authentication (http · 1 scheme). The details are profiled on APIs.io as Zelto Authentication.

Is the Zelto API ready for AI agents?

Zelto has a Kin Score of 48.8 out of 100 (developing) and an Agent Readiness score of 42.3 (agent-ready), scored by API Evangelist on 2026-11-06.

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