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📊 Intel view 📋 Audit JSON 🔄 Changelog
61
A2A

Promptster

www.promptster.dev

Compare quality, speed, and cost across 11 AI providers with one prompt. Includes REST API and MCP server for programmatic access.

🛡
Own this agent?
Verify the domain www.promptster.dev via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.
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🔔 Watch this agent for changes. Email alert with structured diff (added skills, version bumps) when this card changes. Structured JSON via card-changes API. Sign in to subscribe
Trust score
34/100
grade F · 9 criteria
Uptime
100.0%
10 probes
Revenue · 30d
—
no payment wallet declared
Usage · 7d
0
no recent activity
Card drift · 7d
changed
1 snapshots tracked
Owner
unverified
claim this listing →
F
Conformance score: 34/100
F-grade: card is reachable but fails most operational signals.
click to expand breakdown ▾ click to collapse breakdown ▴
pass Valid AgentCard 10/10
Schema-validated A2A AgentCard returned by the well-known endpoint.
fail Live JSON-RPC 5/25
Endpoint replies but body isn't a valid JSON-RPC 2.0 A2A response.
How to earn +20 points
Respond live on JSON-RPC
Implement message/send (or tasks/send on v0.x). Return a 200 with a valid JSON-RPC response. Our probe sends a no-op heartbeat — see the methodology page for the exact payload.
Docs →
fail Protocol version 0/10
No protocolVersion in card.
How to earn +10 points
Declare protocolVersion
Add `"protocolVersion": "1.0"` to the AgentCard root. Without it, callers can't negotiate v0.x vs v1.0 compatibility.
Docs →
info JWS signature 0/10
Card is unsigned (most published agents are).
pass Uptime track record 15/15
10/10 probes succeeded (100% uptime).
fail Skill declaration 0/10
No skills declared in card. Hard to route to.
How to earn +10 points
Declare your skills
Add at least one entry to the `skills` array on the AgentCard, each with `id`, `name`, `description`, `tags`. We canonicalise these into the global skill taxonomy on next probe.
Docs →
fail Verified Identity 0/10
No provider organisation declared. Anonymous agent.
How to earn +10 points
Verify your domain ownership
Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.
Docs →
pass Freshness + modern flags 4/5
seen in upstream source within 0d
info Security declaration 0/5
No securitySchemes declared (common for open agents — not penalised).
⚠ Card drift detected — this agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

last 24h · 0 calls Public aggregate · no PII recorded

No calls observed in the last 7 days. Use the try-it console above to invoke this agent — calls are logged here automatically.

Card history

1 snapshot Every change to agent-card.json
Captured Hash
2026-05-18 12:41:34 current c813b1114d78… view →
Uptime
100.0%
10 probes
Response
171ms
last probe
Skills
0
declared
Streaming
—
SSE-capable

Endpoints

Agent cardhttps://www.promptster.dev/.well-known/ai-agent.json
Discovered via
mcp_registry recrawl_warm

Skills · 1 declared · mapped to canonical taxonomy

Promptster

Compare quality, speed, and cost across 11 AI providers with one prompt. Includes REST API and MCP server for programmatic access.

canonical REST API Integration match 82%

Health · last 10 probes

When HTTP Live JSON-RPC Latency
2026-05-22 12:28:47 200 ✗ 171ms
2026-05-22 06:03:13 200 ✗ 22ms
2026-05-21 14:35:19 200 ✗ 293ms
2026-05-20 13:12:35 200 ✗ 214ms
2026-05-20 06:44:02 200 ✗ 33ms
2026-05-20 03:09:42 200 ✗ 33ms
2026-05-19 22:36:33 200 ✗ 25ms
2026-05-19 15:37:17 200 ✗ 225ms
2026-05-18 23:32:11 200 ✗ 26ms
2026-05-18 12:41:34 200 ✗ 204ms

Cheaper or better alternatives per-skill

↑ 1 higher quality

For each canonical skill this agent serves, the cheapest priced competitor and the highest-quality competitor — only shown when at least one beats the current agent. Skills where this agent is already best on both axes are hidden.

19 other agents serve this

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Embed your Agenstry badge

Paste any of these into your README, agent card, or marketing page. Each badge auto-updates and links back to this page.

Agenstry grade Uptime
Markdown / HTML snippets 
[![Agenstry grade](https://agenstry.com/badge/www.promptster.dev.svg)](https://agenstry.com/agents/www.promptster.dev)
[![Verified Business](https://agenstry.com/badge/www.promptster.dev/identity.svg)](https://agenstry.com/agents/www.promptster.dev)
[![Uptime](https://agenstry.com/badge/www.promptster.dev/uptime.svg)](https://agenstry.com/agents/www.promptster.dev)
[![A2A version](https://agenstry.com/badge/www.promptster.dev/protocol.svg)](https://agenstry.com/agents/www.promptster.dev)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history
Raw agent card JSON 
{
  "schema_version": "1.0",
  "name": "Promptster",
  "description": "Compare quality, speed, and cost across 11 AI providers with one prompt. Includes REST API and MCP server for programmatic access.",
  "url": "https://www.promptster.dev",
  "capabilities": {
    "api": {
      "type": "openapi",
      "url": "https://www.promptster.dev/docs/api/openapi.yaml",
      "documentation": "https://www.promptster.dev/docs/api"
    },
    "mcp": {
      "type": "http",
      "url": "https://www.promptster.dev/mcp",
      "transport": "streamable-http",
      "authentication": "bearer",
      "tools": [
        "test_prompt",
        "compare_prompts",
        "get_usage",
        "get_credits",
        "get_history",
        "list_schedules",
        "get_schedule",
        "run_schedule",
        "get_schedule_runs",
        "export_data"
      ]
    }
  },
  "use_cases": [
    "Compare AI model responses (e.g., GPT-4o vs Claude vs Gemini)",
    "Find the cheapest or fastest AI model for a given prompt",
    "Benchmark AI providers on quality, speed, and cost",
    "Run automated regression tests on AI model performance",
    "Monitor AI model performance drift over time",
    "Export AI testing data for analysis"
  ],
  "providers": [
    "openai",
    "anthropic",
    "google",
    "deepseek",
    "xai",
    "groq",
    "mistral",
    "perplexity",
    "together",
    "cerebras",
    "fireworks"
  ],
  "authentication": {
    "type": "bearer",
    "key_prefix": "pk_live_",
    "documentation": "https://www.promptster.dev/docs/api/authentication"
  },
  "discovery": {
    "llms_txt": "https://www.promptster.dev/llms.txt",
    "llms_full_txt": "https://www.promptster.dev/llms-full.txt",
    "ai_plugin": "https://www.promptster.dev/.well-known/ai-plugin.json",
    "openapi": "https://www.promptster.dev/docs/api/openapi.yaml"
  },
  "contact": "support@promptster.dev"
}