Priorflow

Priorflow Intelligent Agent/Service Selector is a hosted, agent-native selection service at agentopt.app, operated by Vitaly Kantorovich, that ranks curated MCP servers and A2A agents for a natural-language task under stated constraints (reliability, cost, latency, autonomy, maturity) using hybrid structured + semantic matching over a catalog of about 5,000 active / 7,900 total candidates — "registries help agents find candidates; Priorflow helps agents choose among them". The whole product is one JSON operation, POST https://agentopt.app/v1/select, with an open free tier (no key, four fields, top_n <= 5, roughly 20/min · 120/hour · 500/day per IP) and a paid X-API-Key tier sold as Stripe Checkout "select packs" that unlocks rich fields and top_n <= 20. It is described by an A2A agent card at /.well-known/agent-card.json (protocolVersion "1.0", two skills, conformant) whose vendor block is also the only machine-readable contract; the operator states plainly that the host is not an MCP server and runs no A2A task runtime, and publishes no OpenAPI, SDK, terms of service or privacy policy.

Priorflow is listed with 1 API on the APIs.io network. Tagged areas include AI Agents, Agent Discovery, Agent Selection, A2A, and MCP.

Priorflow’s developer surface includes documentation, getting-started guide, pricing, signup flow, authentication, sandbox, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.8/100 thin ▬ flat Agent 14/100 agent aware Front door AI 5/6 prominent Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

1 API

AI Agents Agent DiscoveryAgent SelectionA2A MCP Agent OrchestrationTool RankingSemantic Search Agent-Native

Kin Score

Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0

Composite quality — 31.8/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 6.9 / 17

Access Clarity 7.6 / 17

Operational Transparency 5.2 / 11

Contract Governance 1.9 / 10

Discoverability 5.3 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 14/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 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 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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/.

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 github.com/api-evangelist/agentopt-app: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

Priorflow Intelligent Agent/Service Selector API

One operation: POST /v1/select with JSON {query, top_n?, constraints?, weights?, caller_agent?} returns ordered MCP/A2A candidates with an absolute 0-1 hybrid-fit score (0.55 us...

Pricing Plans 1

Published pricing tiers and plan structures.

Agentopt App Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Agentopt App Rate Limits

4 limits

RATE LIMITS

Security Posture 2

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

Agentopt App Authentication

apiKey/http-bearer · 2 schemes

SECURITY

Agentopt App Domain Security

TLSv1.2

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Sandbox

Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Conformance

Lifecycle

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Playground

Playground

AgentCard

AgentCard

Source (apis.yml)

aid: agentopt-app
name: Priorflow
description: Priorflow Intelligent Agent/Service Selector is a hosted, agent-native selection service at agentopt.app, operated
  by Vitaly Kantorovich, that ranks curated MCP servers and A2A agents for a natural-language task under stated constraints
  (reliability, cost, latency, autonomy, maturity) using hybrid structured + semantic matching over a catalog of about 5,000
  active / 7,900 total candidates — "registries help agents find candidates; Priorflow helps agents choose among them". The
  whole product is one JSON operation, POST https://agentopt.app/v1/select, with an open free tier (no key, four fields, top_n
  <= 5, roughly 20/min · 120/hour · 500/day per IP) and a paid X-API-Key tier sold as Stripe Checkout "select packs" that
  unlocks rich fields and top_n <= 20. It is described by an A2A agent card at /.well-known/agent-card.json (protocolVersion
  "1.0", two skills, conformant) whose vendor block is also the only machine-readable contract; the operator states plainly
  that the host is not an MCP server and runs no A2A task runtime, and publishes no OpenAPI, SDK, terms of service or privacy
  policy.
url: https://raw.githubusercontent.com/api-evangelist/agentopt-app/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-19 (local-v3; was a2a-registry harvest stub)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- AI Agents
- Agent Discovery
- Agent Selection
- A2A
- MCP
- Agent Orchestration
- Tool Ranking
- Semantic Search
- Agent-Native
tags_raw:
- AI agents
- Agent discovery
- Agent selection
- A2A
- MCP
- Agent orchestration
- Tool ranking
- Semantic search
- Agent-native
- agent-native
apis:
- aid: agentopt-app:priorflow-select-api
  name: Priorflow Intelligent Agent/Service Selector API
  description: 'One operation: POST /v1/select with JSON {query, top_n?, constraints?, weights?, caller_agent?} returns ordered
    MCP/A2A candidates with an absolute 0-1 hybrid-fit score (0.55 usable, 0.72+ strong). Free tier needs no key (non-empty
    User-Agent required) and returns id, score, score_band, name with top_n <= 5; a paid pf_live_ key sent as X-API-Key or
    Authorization Bearer unlocks source_url, endpoint/connect, homepage_url, endpoint_status, tags, dimensions, recommendation,
    clarifications and score_breakdown with top_n <= 20. Invalid keys 401; paid features without a key 402 upgrade_required;
    free-tier exhaustion 429 with a machine-readable upgrade object. Described only by the A2A agent card''s priorflow.api
    block — no OpenAPI is published; robots.txt disallows /v1/ to crawlers.'
  humanURL: https://agentopt.app/info
  baseURL: https://agentopt.app/v1
  tags:
  - AI Agents
  - Agent Discovery
  - Agent Selection
  - A2A
  - MCP
  properties:
  - type: Documentation
    url: https://agentopt.app/info
  - type: GettingStarted
    url: https://agentopt.app/info#integrate
  - type: Playground
    url: https://agentopt.app/try
  - type: AgentCard
    url: a2a/agentopt-app-a2a.yml
  - type: AgentCard
    name: A2A Agent Card (provider-hosted)
    url: https://agentopt.app/.well-known/agent-card.json
  - type: Authentication
    url: authentication/agentopt-app-authentication.yml
  - type: Conventions
    url: conventions/agentopt-app-conventions.yml
  - type: ErrorCatalog
    url: errors/agentopt-app-problem-types.yml
  - type: RateLimits
    url: rate-limits/agentopt-app-rate-limits.yml
  - type: Plans
    url: plans/agentopt-app-plans-pricing.yml
  - type: Sandbox
    url: sandbox/agentopt-app-sandbox.yml
  - type: Conformance
    url: conformance/agentopt-app-conformance.yml
  - type: Lifecycle
    url: lifecycle/agentopt-app-lifecycle.yml
  overlays: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://agentopt.app/
- type: Documentation
  url: https://agentopt.app/info
- type: GettingStarted
  url: https://agentopt.app/info#integrate
- type: Playground
  url: https://agentopt.app/try
- type: Pricing
  url: https://agentopt.app/upgrade
- type: SignUp
  url: https://agentopt.app/upgrade
- type: StatusPage
  url: https://agentopt.app/status
- type: AgentCard
  url: a2a/agentopt-app-a2a.yml
- type: WellKnown
  url: well-known/agentopt-app-well-known.yml
- type: LLMsTxt
  url: llms/agentopt-app-llms.txt
- type: Authentication
  url: authentication/agentopt-app-authentication.yml
- type: Conventions
  url: conventions/agentopt-app-conventions.yml
- type: ErrorCatalog
  url: errors/agentopt-app-problem-types.yml
- type: RateLimits
  url: rate-limits/agentopt-app-rate-limits.yml
- type: Plans
  url: plans/agentopt-app-plans-pricing.yml
- type: Sandbox
  url: sandbox/agentopt-app-sandbox.yml
- type: Conformance
  url: conformance/agentopt-app-conformance.yml
- type: Lifecycle
  url: lifecycle/agentopt-app-lifecycle.yml
- type: DomainSecurity
  url: security/agentopt-app-domain-security.yml
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 15
  pass: local-v3
x-coverage:
  state: covered
  reason: null
  detail: 'Full public surface reached with no wall: the A2A agent card was fetched from the provider''s own host (200, 8,377
    bytes, conformant) and every human page (/info, /try, /upgrade, /status) is server-rendered HTML. The provider publishes
    no OpenAPI — /openapi.json, /docs and /redoc all return the app''s JSON 404 — and robots.txt disallows /v1/, /mcp and
    /a2a, which this pass honored, so POST /v1/select was described from the card and pages rather than exercised.'
  evidence:
  - url: https://agentopt.app/.well-known/agent-card.json
    status: 200
  - url: https://agentopt.app/openapi.json
    status: 404
  - url: https://agentopt.app/robots.txt
    status: 200
  checked: '2026-09-19'
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://agentopt.app/.well-known/agent-card.json
  grade: near-conformant
  protocol_version: '1.0'
  control: 404

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/agentopt-app"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/agentopt-app/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/agentopt-app/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.