signalaf-com

SignalAF (legal name Ello Cello LLC) provides the SigRank AI leaderboard platform that ranks AI operators by Yield, a metric combining cache reads, output and input efficiency. The service offers a public REST API with OpenAPI 3.0 specification, authentication via Supabase OAuth and API keys, rate‑limit policies, error handling with RFC 9457 problem details, versioned endpoints under /api/v1, and extensive developer documentation hosted at https://signalaf.com/developers. The organization is based in Buffalo, NY, and maintains open‑source SDKs and tools.

signalaf-com publishes 4 API contracts indexed on the APIs.io network, including Hall API, Leaderboard API, Metrics API, and 1 more. Tagged areas include AI, Analytics, Leaderboard, OpenAPI, and PublicAPI.

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

signalaf-com’s developer surface includes authentication, pricing, documentation, API reference, getting-started guide, support, engineering blog, and 25 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

53.0/100 developing Agent 45/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers 4 Agent Skills

AIAnalyticsLeaderboardOpenAPIPublicAPI

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 53.0/100 · developing

Contract Quality 11.8 / 21

Developer Ergonomics 12.0 / 17

Access Clarity 7.6 / 17

Operational Transparency 2.3 / 11

Contract Governance 3.6 / 10

Discoverability 5.5 / 9

Regulatory Posture 4.8 / 15

Agent readiness — 45/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 5 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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):

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)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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

3 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 55.4 — up to +11.2 composite points
Access Clarity scores 44.7 — up to +11.1 composite points
Operational Transparency scores 21.1 — up to +10.3 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/signalaf-com/apis.yml: open an issue on github.com/api-evangelist/signalaf-com 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 →

APIs 4

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

signalaf-com Hall API

The hall API from signalaf-com — 1 operation(s) for hall.

signalaf-com Leaderboard API

The leaderboard API from signalaf-com — 1 operation(s) for leaderboard.

signalaf-com Metrics API

The metrics API from signalaf-com — 1 operation(s) for metrics.

signalaf-com Operators API

The operators API from signalaf-com — 2 operation(s) for operators.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

signalaf-com MCP Server

Remote MCP server at signalaf.com.

MCP SERVER

Agent Skills 4

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

get-hall-of-signal

AGENT SKILL

get-leaderboard

AGENT SKILL

get-metrics

AGENT SKILL

get-operator

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Signalaf Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Signalaf Com Rate Limits

1 limits

RATE LIMITS

Semantic Vocabularies 1

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

Signalaf Com Context

3 classes · 9 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

signalaf-com API Rules

16 rules · 14 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

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.

Signalaf Com Openapi Overlay

0 actions · update

UNRECORDED

JSON Schema 3

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

HallOfSignal

2 properties

JSON SCHEMA

Leaderboard

1 properties

JSON SCHEMA

Operator

6 properties

JSON SCHEMA

Security Posture 2

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

Signalaf Com Authentication

1 scheme

SECURITY

Signalaf Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Signalaf Com Scopes

4 scopes

SCOPES

Agentic Access 1

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

Signalaf Com Agentic Access

5 operations

5 operations · 0 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

SDKs

SDKs

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: signalaf-com
name: signalaf-com
description: SignalAF (legal name Ello Cello LLC) provides the SigRank AI leaderboard platform that ranks AI operators by
  Yield, a metric combining cache reads, output and input efficiency. The service offers a public REST API with OpenAPI 3.0
  specification, authentication via Supabase OAuth and API keys, rate‑limit policies, error handling with RFC 9457 problem
  details, versioned endpoints under /api/v1, and extensive developer documentation hosted at https://signalaf.com/developers.
  The organization is based in Buffalo, NY, and maintains open‑source SDKs and tools.
url: https://artifacts.apis.io/signalaf-com/apis.yml
image: https://signalaf.com/logo.png
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-30 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- AI
- Analytics
- Leaderboard
- OpenAPI
- PublicAPI
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/signalaf-com-agentic-access.yml
- type: RateLimits
  url: rate-limits/signalaf-com-rate-limits.yml
- type: Spectral
  url: rules/signalaf-com-rules.yml
- type: JSONLD
  url: json-ld/signalaf-com-context.jsonld
- type: Vocabulary
  url: vocabulary/signalaf-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/signalaf-com-data-model.yml
- type: Authentication
  url: authentication/signalaf-com-authentication.yml
- type: OAuthScopes
  url: scopes/signalaf-com-scopes.yml
- type: ErrorCatalog
  url: errors/signalaf-com-problem-types.yml
- type: Conformance
  url: conformance/signalaf-com-conformance.yml
- type: LLMsTxt
  url: llms/signalaf-com-llms.txt
- type: AgentCard
  url: a2a/signalaf-com-a2a.yml
- type: ToolCrosswalk
  url: mcp/signalaf-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/signalaf-com-mcp.yml
- type: WellKnown
  url: well-known/signalaf-com-well-known.yml
- type: Hosts
  url: hosts/signalaf-com-hosts.yml
- type: Vendors
  url: vendors/signalaf-com-vendors.yml
- type: SDKs
  url: packages/signalaf-com-packages.yml
- type: Packages
  url: packages/signalaf-com-packages.yml
- type: TermsOfService
  url: https://signalaf.com/terms
- type: PrivacyPolicy
  url: https://signalaf.com/privacy
- type: Pricing
  url: https://signalaf.com/pricing
- type: Login
  url: https://signalaf.com/login
- type: DomainSecurity
  url: security/signalaf-com-domain-security.yml
- type: Website
  url: https://signalaf.com/
- type: DeveloperPortal
  url: https://signalaf.com/developers
- type: Documentation
  url: https://signalaf.com/developers
- type: APIReference
  url: https://signalaf.com/openapi.json
- type: GettingStarted
  url: https://signalaf.com/auth.md
- type: Support
  url: https://signalaf.com/contact
- type: Blog
  url: https://signalaf.com/blog
apis:
- aid: signalaf-com:signalaf-com-hall-api
  name: signalaf-com Hall API
  description: The hall API from signalaf-com — 1 operation(s) for hall.
  humanURL: https://signalaf.com/developers
  baseURL: https://signalaf.com/api/v1
  tags:
  - hall
  properties:
  - type: OpenAPI
    url: openapi/signalaf-com-hall-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signalaf-com-operator-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-hall-of-signal-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-leaderboard-schema.json
- aid: signalaf-com:signalaf-com-leaderboard-api
  name: signalaf-com Leaderboard API
  description: The leaderboard API from signalaf-com — 1 operation(s) for leaderboard.
  humanURL: https://signalaf.com/developers
  baseURL: https://signalaf.com/api/v1
  tags:
  - leaderboard
  properties:
  - type: OpenAPI
    url: openapi/signalaf-com-leaderboard-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signalaf-com-operator-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-hall-of-signal-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-leaderboard-schema.json
- aid: signalaf-com:signalaf-com-metrics-api
  name: signalaf-com Metrics API
  description: The metrics API from signalaf-com — 1 operation(s) for metrics.
  humanURL: https://signalaf.com/developers
  baseURL: https://signalaf.com/api/v1
  tags:
  - metrics
  properties:
  - type: OpenAPI
    url: openapi/signalaf-com-metrics-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signalaf-com-operator-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-hall-of-signal-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-leaderboard-schema.json
- aid: signalaf-com:signalaf-com-operators-api
  name: signalaf-com Operators API
  description: The operators API from signalaf-com — 2 operation(s) for operators.
  humanURL: https://signalaf.com/developers
  baseURL: https://signalaf.com/api/v1
  tags:
  - operators
  properties:
  - type: OpenAPI
    url: openapi/signalaf-com-operators-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signalaf-com-operator-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-hall-of-signal-schema.json
  - type: JSONSchema
    url: json-schema/signalaf-com-leaderboard-schema.json
x-enrichment:
  date: '2026-10-30'
  status: enriched
  artifacts_added: 39
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

signalaf-com API — frequently asked questions

Does signalaf-com have an API?

Yes. APIs.io lists 4 APIs from signalaf-com, including signalaf-com Hall API, signalaf-com Leaderboard API and signalaf-com Metrics API, and 1 more.

Is there an OpenAPI specification for the signalaf-com API?

Yes. APIs.io indexes 4 OpenAPI specifications for signalaf-com, each linked for download from this page.

How do I authenticate with the signalaf-com API?

signalaf-com uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Signalaf Com Authentication.

Does signalaf-com have an MCP server?

Yes. APIs.io lists 1 MCP server for signalaf-com: Remote MCP server at signalaf.com.

Is the signalaf-com API ready for AI agents?

signalaf-com has a Kin Score of 53.0 out of 100 (developing) and an Agent Readiness score of 45.0 (agent-ready), scored by API Evangelist on 2026-10-31.

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