promptqualityscore.com
Generates 1-5 ranked prompt rewrites scored on the 8-dimension PQS rubric.
InferenceLiveeip155:8453Exactvia facilitator:dexter
Settlements · 30d
6↓ 100%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$34.92
Verified settled volume
1,090 settlements proven x402 by their on-chain EIP-3009 marker.
$0.100
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xB40a687ca5483Ebc02F870348f6e08971Cae1308The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB40a687ca5483Ebc02F870348f6e08971Cae1308",
"amount": "100000",
"scheme": "exact",
"iconUrl": "https://raw.githubusercontent.com/OnChainAIIntel/assets/main/onchainintel_profile_pic.png",
"network": "eip155:8453",
"category": "ai",
"mimeType": "application/json",
"description": "Generate N ranked prompt variants. Diverse rewrites scored on the 8-dimension PQS rubric, returned best-first.",
"serviceName": "Prompt Quality Score",
"discoverable": true,
"outputSchema": {
"input": {
"type": "http",
"method": "POST",
"bodyType": "json",
"discoverable": true
},
"output": {
"type": "object",
"required": [
"pqs_version",
"variants"
],
"properties": {
"variants": {
"type": "array",
"items": {
"type": "object",
"properties": {
"score": {
"type": "object",
"properties": {
"grade": {
"enum": [
"A",
"B",
"C",
"D",
"F"
],
"type": "string"
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"total": {
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"maximum": 80,
"minimum": 8
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80
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"type": "integer"
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"dimensions": {
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"properties": {
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"maximum": 80,
"minimum": 8
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"clarity": {
"type": "integer",
"maximum": 10,
"minimum": 1
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"context": {
"type": "integer",
"maximum": 10,
"minimum": 1
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"examples": {
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"cot_structure": {
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"maximum": 10,
"minimum": 1
},
"output_format": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"role_definition": {
"type": "integer",
"maximum": 10,
"minimum": 1
}
}
},
"percentile": {
"type": "integer"
}
}
},
"style": {
"type": "string",
"description": "Generation angle: detailed | concise | structured | role-framed | example-led"
},
"prompt": {
"type": "string"
},
"delta_vs_baseline": {
"type": "integer",
"description": "score.total - baseline_score.total"
}
}
},
"maxItems": 5,
"minItems": 1
},
"vertical": {
"type": "string"
},
"powered_by": {
"type": "string"
},
"pqs_version": {
"enum": [
"2.0"
],
"type": "string"
},
"baseline_score": {
"type": "object",
"properties": {
"grade": {
"enum": [
"A",
"B",
"C",
"D",
"F"
],
"type": "string"
},
"total": {
"type": "integer",
"maximum": 80,
"minimum": 8
},
"out_of": {
"enum": [
80
],
"type": "integer"
},
"dimensions": {
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"properties": {
"total": {
"type": "integer",
"maximum": 80,
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"clarity": {
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},
"context": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"examples": {
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},
"constraints": {
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"minimum": 1
},
"specificity": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"cot_structure": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"output_format": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"role_definition": {
"type": "integer",
"maximum": 10,
"minimum": 1
}
}
},
"percentile": {
"type": "integer"
}
}
},
"original_prompt": {
"type": "string"
},
"best_variant_index": {
"type": "integer",
"minimum": 0
}
}
}
},
"networkLegacy": "base",
"maxAmountRequired": "100000",
"maxTimeoutSeconds": 300,
"maxAmountRequiredUSD": "$0.10"
}
],
"iconUrl": "https://raw.githubusercontent.com/OnChainAIIntel/assets/main/onchainintel_profile_pic.png",
"preview": {
"mode": "preview",
"message": "This endpoint is POST-only with x402 payment. GET returns the 402 PaymentRequired envelope for discovery.",
"upgrade": "POST /api/variants with an x402 payment ($0.10 USDC on Base), or send Authorization: Bearer PQS_... with an API key from promptqualityscore.com/api-key, to receive a real response.",
"powered_by": "PQS - promptqualityscore.com"
},
"resource": {
"url": "https://promptqualityscore.com/api/variants",
"mimeType": "",
"description": "Generate N ranked prompt variants. Diverse rewrites scored on the 8-dimension PQS rubric, returned best-first."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"count": 3,
"prompt": "Explain PQS scoring in one sentence to an AI agent operator.",
"vertical": "general"
},
"type": "http",
"method": "GET",
"bodyType": "json",
"pathParams": {}
},
"output": {
"type": "json",
"example": {
"variants": [
{
"score": {
"grade": "A",
"total": 68,
"out_of": 80,
"dimensions": {
"total": 68,
"clarity": 9,
"context": 8,
"examples": 8,
"constraints": 9,
"specificity": 9,
"cot_structure": 8,
"output_format": 9,
"role_definition": 8
},
"percentile": 85
},
"style": "role-framed",
"prompt": "You are an AI-agent product manager. In one sentence (max 25 words), explain PQS scoring to a technical buyer who evaluates x402 APIs. Focus on: what it measures, when it runs (pre-inference), and why the buyer should care.",
"delta_vs_baseline": 22
},
{
"score": {
"grade": "B",
"total": 62,
"out_of": 80,
"dimensions": {
"total": 62,
"clarity": 9,
"context": 7,
"examples": 8,
"constraints": 8,
"specificity": 8,
"cot_structure": 7,
"output_format": 9,
"role_definition": 6
},
"percentile": 75
},
"style": "structured",
"prompt": "Write a one-sentence pitch of PQS scoring for an AI agent operator. Format: 'PQS scores [what] on [N] dimensions so [agent] can [action] before [event].'",
"delta_vs_baseline": 16
},
{
"score": {
"grade": "B",
"total": 58,
"out_of": 80,
"dimensions": {
"total": 58,
"clarity": 8,
"context": 7,
"examples": 10,
"constraints": 6,
"specificity": 7,
"cot_structure": 8,
"output_format": 7,
"role_definition": 5
},
"percentile": 70
},
"style": "example-led",
"prompt": "Example output: 'PQS scores any LLM prompt on 8 dimensions pre-inference so AI-agent buyers can reject low-quality inputs before paying for a run.' Now write a similar one-sentence pitch for an agent operator.",
"delta_vs_baseline": 12
}
],
"vertical": "general",
"powered_by": "PQS - promptqualityscore.com",
"pqs_version": "2.0",
"baseline_score": {
"grade": "C",
"total": 46,
"out_of": 80,
"dimensions": {
"total": 46,
"clarity": 7,
"context": 6,
"examples": 4,
"constraints": 5,
"specificity": 6,
"cot_structure": 6,
"output_format": 7,
"role_definition": 5
},
"percentile": 58
},
"original_prompt": "Explain PQS scoring in one sentence to an AI agent operator.",
"best_variant_index": 0
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"prompt"
],
"properties": {
"count": {
"type": "integer",
"default": 3,
"maximum": 5,
"minimum": 1,
"description": "Number of variants to generate (1-5)"
},
"prompt": {
"type": "string",
"maxLength": 10000,
"minLength": 1,
"description": "Prompt to generate variants for"
},
"vertical": {
"enum": [
"software",
"content",
"business",
"education",
"science",
"crypto",
"general",
"research"
],
"type": "string",
"default": "general"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"pathParams": {
"type": "object"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
},
"category": "ai",
"discoverable": true,
"routeTemplate": ":var1"
}
},
"serviceName": "Prompt Quality Score",
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.1USDC≈ $0.1 USD
on Base · exact scheme
Pay 0.1 USDC on Base to 0xB40a…e1308. The signed payment is good for 5 minutes.
- Paid to
- 0xB40a…e1308
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 100000 smallest units
- Buys
- PQS variants - generate N ranked prompt rewrites (1-5) scored on the 8-dimension rubric
- Returns
- application/json
The catalog’s raw entry
[
{
"tags": [
"prompt-quality",
"llm",
"variants",
"x402",
"pqs"
],
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB40a687ca5483Ebc02F870348f6e08971Cae1308",
"amount": "100000",
"scheme": "exact",
"iconUrl": "https://raw.githubusercontent.com/OnChainAIIntel/assets/main/onchainintel_profile_pic.png",
"network": "eip155:8453",
"category": "ai",
"mimeType": "application/json",
"resource": "https://promptqualityscore.com/api/variants",
"description": "PQS variants - generate N ranked prompt rewrites (1-5) scored on the 8-dimension rubric",
"serviceName": "Prompt Quality Score",
"discoverable": true,
"outputSchema": {
"input": {
"type": "http",
"method": "POST",
"bodyType": "json",
"bodyFields": {
"count": {
"type": "integer",
"description": "Number of variants to generate (1-5, default 3)"
},
"prompt": {
"type": "string",
"description": "Prompt to generate variants for"
},
"vertical": {
"type": "string",
"description": "Domain: software/content/business/education/science/crypto/general/research"
}
},
"discoverable": true
},
"output": {
"type": "object",
"required": [
"pqs_version",
"variants"
],
"properties": {
"variants": {
"type": "array",
"items": {
"type": "object",
"properties": {
"score": {
"type": "object",
"properties": {
"grade": {
"enum": [
"A",
"B",
"C",
"D",
"F"
],
"type": "string"
},
"total": {
"type": "integer",
"maximum": 80,
"minimum": 8
},
"out_of": {
"enum": [
80
],
"type": "integer"
},
"dimensions": {
"type": "object",
"properties": {
"total": {
"type": "integer",
"maximum": 80,
"minimum": 8
},
"clarity": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"context": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"examples": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"constraints": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"specificity": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"cot_structure": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"output_format": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"role_definition": {
"type": "integer",
"maximum": 10,
"minimum": 1
}
}
},
"percentile": {
"type": "integer"
}
}
},
"style": {
"type": "string",
"description": "Generation angle: detailed | concise | structured | role-framed | example-led"
},
"prompt": {
"type": "string"
},
"delta_vs_baseline": {
"type": "integer",
"description": "score.total - baseline_score.total"
}
}
},
"maxItems": 5,
"minItems": 1
},
"vertical": {
"type": "string"
},
"powered_by": {
"type": "string"
},
"pqs_version": {
"enum": [
"2.0"
],
"type": "string"
},
"baseline_score": {
"type": "object",
"properties": {
"grade": {
"enum": [
"A",
"B",
"C",
"D",
"F"
],
"type": "string"
},
"total": {
"type": "integer",
"maximum": 80,
"minimum": 8
},
"out_of": {
"enum": [
80
],
"type": "integer"
},
"dimensions": {
"type": "object",
"properties": {
"total": {
"type": "integer",
"maximum": 80,
"minimum": 8
},
"clarity": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"context": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"examples": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"constraints": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"specificity": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"cot_structure": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"output_format": {
"type": "integer",
"maximum": 10,
"minimum": 1
},
"role_definition": {
"type": "integer",
"maximum": 10,
"minimum": 1
}
}
},
"percentile": {
"type": "integer"
}
}
},
"original_prompt": {
"type": "string"
},
"best_variant_index": {
"type": "integer",
"minimum": 0
}
}
}
},
"networkLegacy": "base",
"maxAmountRequired": "100000",
"maxTimeoutSeconds": 300,
"maxAmountRequiredUSD": "$0.10"
}
]Provenance
- Seen in the source catalog
- 2026-09-23 23:56Z
- Last indexed by Roundhouse
- 2026-09-24 09:15Z
- Last enriched (probe, favicon, geo)
- 2026-09-10 02:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service promptqualityscore.com and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=promptqualityscore.com' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://promptqualityscore.com/api/variants, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.