api.relai.fi
Checks prompt quality and x402 endpoint trust before inference.
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.
$0.050
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": "50000",
"scheme": "exact",
"iconUrl": "https://raw.githubusercontent.com/OnChainAIIntel/assets/main/onchainintel_profile_pic.png",
"network": "eip155:8453",
"category": "ai",
"mimeType": "application/json",
"description": "Combined PQS prompt quality + x402 endpoint trust check before inference",
"serviceName": "Prompt Quality Score",
"discoverable": true,
"outputSchema": {
"input": {
"type": "http",
"method": "POST",
"bodyType": "json",
"discoverable": true
},
"output": {
"type": "object",
"required": [
"pqs_version",
"clearance",
"prompt"
],
"properties": {
"chain": {
"enum": [
"base",
"solana"
],
"type": "string"
},
"prompt": {
"type": "object",
"properties": {
"grade": {
"type": "string"
},
"score": {
"type": "integer"
},
"out_of": {
"enum": [
80
],
"type": "integer"
},
"feedback": {
"type": "array",
"items": {
"type": "string"
}
},
"top_issue": {
"type": [
"string",
"null"
]
},
"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
}
}
},
"threshold_met": {
"type": "boolean"
}
}
},
"endpoint": {
"type": "object",
"properties": {
"wallet": {
"type": "string"
},
"trust_label": {
"type": "string"
},
"trust_score": {
"type": "number"
},
"resolution_source": {
"type": "string"
}
},
"description": "Present only when endpoint_url was supplied"
},
"clearance": {
"enum": [
"CLEAR",
"CAUTION",
"BLOCK"
],
"type": "string"
},
"confidence": {
"type": "number"
},
"pqs_version": {
"enum": [
"2.0"
],
"type": "string"
}
}
}
},
"networkLegacy": "base",
"maxAmountRequired": "50000",
"maxTimeoutSeconds": 300,
"maxAmountRequiredUSD": "$0.05"
}
],
"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/preflight with an x402 payment ($0.05 USDC on Base), or send Authorization: Bearer PQS_... with an API key from promptqualityscore.com/api-key, to receive a real response.",
"powered_by": "PQS - promptqualityscore.com"
},
"resource": {
"url": "https://promptqualityscore.com/api/preflight",
"mimeType": "",
"description": "Combined PQS prompt quality + x402 endpoint trust check before inference"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"prompt": "Explain PQS scoring in one sentence to an AI agent operator.",
"vertical": "general",
"endpoint_url": "https://example.com/api/weather"
},
"type": "http",
"method": "GET",
"bodyType": "json",
"pathParams": {}
},
"output": {
"type": "json",
"example": {
"prompt": {
"grade": "C",
"score": 46,
"out_of": 80,
"feedback": [
"Specify the exact output format you want (bullets, JSON, prose).",
"Name the target reader or persona explicitly.",
"Add one concrete example of the ideal response."
],
"top_issue": "Specify the exact output format you want (bullets, JSON, prose).",
"dimensions": {
"total": 46,
"clarity": 7,
"context": 6,
"examples": 4,
"constraints": 5,
"specificity": 6,
"cot_structure": 6,
"output_format": 7,
"role_definition": 5
},
"threshold_met": true
},
"endpoint": {
"wallet": "0xD2DfC5796de622E08C13f3016E92cfa15Ea33D0F",
"trust_label": "Established",
"trust_score": 0.78,
"resolution_source": "well_known"
},
"clearance": "CAUTION",
"confidence": 0.68,
"pqs_version": "2.0",
"upgrade_url": "https://promptqualityscore.com"
}
}
},
"schema": {
"type": "object",
"$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": {
"prompt": {
"type": "string",
"maxLength": 10000,
"minLength": 1,
"description": "Prompt to preflight"
},
"vertical": {
"enum": [
"software",
"content",
"business",
"education",
"science",
"crypto",
"general",
"research"
],
"type": "string",
"default": "general",
"description": "Domain: software/content/business/education/science/crypto/general/research"
},
"endpoint_url": {
"type": "string",
"description": "Optional endpoint URL for trust scoring"
}
}
},
"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.
0.05USDC≈ $0.05 USD
on Base · exact scheme
Pay 0.05 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
- 50000 smallest units
- Buys
- Combined PQS prompt quality + x402 endpoint trust check before inference
- Returns
- application/json
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB40a687ca5483Ebc02F870348f6e08971Cae1308",
"amount": "50000",
"scheme": "exact",
"iconUrl": "https://raw.githubusercontent.com/OnChainAIIntel/assets/main/onchainintel_profile_pic.png",
"network": "eip155:8453",
"category": "ai",
"mimeType": "application/json",
"resource": "https://api.relai.fi/relay/1779373065272/api/preflight",
"description": "Combined PQS prompt quality + x402 endpoint trust check before inference",
"serviceName": "Prompt Quality Score",
"discoverable": true,
"outputSchema": {
"input": {
"type": "http",
"method": "POST",
"bodyType": "json",
"discoverable": true
},
"output": {
"type": "object",
"required": [
"pqs_version",
"clearance",
"prompt"
],
"properties": {
"chain": {
"enum": [
"base",
"solana"
],
"type": "string"
},
"prompt": {
"type": "object",
"properties": {
"grade": {
"type": "string"
},
"score": {
"type": "integer"
},
"out_of": {
"enum": [
80
],
"type": "integer"
},
"feedback": {
"type": "array",
"items": {
"type": "string"
}
},
"top_issue": {
"type": [
"string",
"null"
]
},
"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
}
}
},
"threshold_met": {
"type": "boolean"
}
}
},
"endpoint": {
"type": "object",
"properties": {
"wallet": {
"type": "string"
},
"trust_label": {
"type": "string"
},
"trust_score": {
"type": "number"
},
"resolution_source": {
"type": "string"
}
},
"description": "Present only when endpoint_url was supplied"
},
"clearance": {
"enum": [
"CLEAR",
"CAUTION",
"BLOCK"
],
"type": "string"
},
"confidence": {
"type": "number"
},
"pqs_version": {
"enum": [
"2.0"
],
"type": "string"
}
}
}
},
"networkLegacy": "base",
"maxAmountRequired": "50000",
"maxTimeoutSeconds": 300,
"maxAmountRequiredUSD": "$0.05"
}
]Provenance
- Seen in the source catalog
- 2026-09-20 05:29Z
- Last indexed by Roundhouse
- 2026-09-21 04:45Z
- Last enriched (probe, favicon, geo)
- 2026-09-16 17:45Z
- 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 api.relai.fi 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=api.relai.fi' 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://api.relai.fi/relay/1779373065272/api/preflight, 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.