QRBase
Other PAYMENT-READY importedpayment-ready until 2026-08-20
imported from the x402 Bazaar, not submitted by the operator · own this service? claim it · or ask to be removed
Paid ping endpoints from QRBase on Base. GET /api/x402/ping (0.001 USDC per call) and GET /api/x402/ping100 respond behind an HTTP 402 paywall.
Pay from $0.001 to $100.00 in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
first settlement 2026-01-02 · $1.02 all-time · settled via coinbase
ASSESSMENT
updated 4h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 1766ms
- avg response
- 808ms
- total checks
- 2,118
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (13/14): declares the current x402 version (2)
13 of 14 x402 conformance checks pass; failing: declares the current x402 version (2). Full checklist below.
price $0.001 to $100.00 (p13 in Other)
- price (min)
- $0.001
- price (max)
- $100.00
- category percentile (min)
- p13 in Other
- category percentile (max)
- p97 in Other
- endpoints / prices
- 2 / 2
- model
- tiered
- stability
- 100%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- -
- registrar
- -
- hosting
- custom
- domain created
- ---
Identity facts, not a risk score.
traction $0.002 30d · 2 buyers
- volume 30d
- $0.002
- buyers 30d
- 2
- settlements 30d
- 2
- first settlement
- 2026-01-02
- last settlement
- 2026-08-07
- top buyer share
- 50% of 30d volume
- trend 7d vs 30d
- 2.14x the 30d daily rate
- networks
- eip155:8453
- volume all-time
- $1.02
- settlements all-time
- 176
- median settlement 30d
- $0.001
- max settlement 30d
- $0.001
- settled via
- coinbase ($0.002, 2 tx)
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is a concentration signal, not part of the ranking score.
WHAT IT DOES
ai-derivedProvides a ping API service on the Base network
- category
- ping-service
- in
- query params
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /api/x402/ping | Ping - 0.001 USDC on Base | $0.001 | Base | USDC | body (v1 style) |
| GET | /api/x402/ping100 | Ping - 100 USDC on Base | $100.00 | Base | USDC | body (v1 style) |
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /api/x402/ping returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i 'https://www.qrbase.xyz/api/x402/ping'
// 402 response (captured by monitor) · 2 payloads · click to expand
[
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"tags": [
"API",
"Coinbase",
"USDC",
"CDP",
"x402"
],
"type": "http",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x07737A1fB3863202bcd3c7408b801EEd68604D39",
"scheme": "exact",
"network": "base",
"category": "API Access",
"metadata": {},
"mimeType": "",
"resource": "https://www.qrbase.xyz/api/x402/ping",
"description": "Ping - 0.001 USDC on Base",
"x402Version": 1,
"discoverable": true,
"outputSchema": {
"input": {
"type": "http",
"method": "GET"
},
"output": {
"type": "object",
"properties": {
"sender": {
"type": "string"
},
"message": {
"type": "string"
},
"success": {
"type": "boolean"
},
"x402Version": {
"type": "number"
},
"paymentTransaction": {
"type": "string"
}
}
}
},
"maxAmountRequired": "1000",
"maxTimeoutSeconds": 60
}
],
"x402Version": 1
},
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"tags": [
"API",
"Coinbase",
"USDC",
"CDP",
"x402"
],
"type": "http",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x07737A1fB3863202bcd3c7408b801EEd68604D39",
"scheme": "exact",
"network": "base",
"category": "API Access",
"metadata": {},
"mimeType": "",
"resource": "https://www.qrbase.xyz/api/x402/ping100",
"description": "Ping - 100 USDC on Base",
"x402Version": 1,
"discoverable": true,
"outputSchema": {
"input": {
"type": "http",
"method": "GET"
},
"output": {
"type": "object",
"properties": {
"sender": {
"type": "string"
},
"message": {
"type": "string"
},
"success": {
"type": "boolean"
},
"x402Version": {
"type": "number"
},
"paymentTransaction": {
"type": "string"
}
}
}
},
"maxAmountRequired": "100000000",
"maxTimeoutSeconds": 60
}
],
"x402Version": 1
}
] OVER TIME
All charts use the 7d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/qrbase/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
Median across 2 endpoints. Use the selector to isolate one.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
13/14 checks pass · grade A · failing: declares the current x402 version (2)last 402 captured 2026-07-20 · last up 2026-08-13
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
EMBED THIS BADGE
<a href="https://x402-list.com/services/qrbase?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/qrbase.svg" alt="QRBase listed on x402-list" height="28"> </a>
[](https://x402-list.com/services/qrbase?utm_source=badge&utm_medium=referral&utm_campaign=embed)
<a href="https://x402-list.com/services/qrbase?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/qrbase.svg?data=uptime" alt="QRBase uptime on x402-list" height="28"> </a>