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
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'