x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/396

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.

The specific endpoint at `/api/v1/payments/396` is labeled "Premium API Access" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call — consistent with the site's advertised flat pricing. Payment is made via the x402 exact scheme, settling to the specified wallet address with a 300-second timeout.

The platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, API, README) all returned only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind this particular `/payments/396` endpoint is unclear — the description is simply "Premium API Access" with no further specification of what data or service it returns.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyno-rate-limitdata-analyticsai-inferencefinance-datautility-services

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
  • —Fetching real-time financial data such as token quotes, exchange rates, and gas estimates
  • —Performing utility operations like geocoding, validation, and data conversion on a per-call payment basis

Fit

Best for

  • —Developers who want instant API access without signup or API keys
  • —Agents and bots that can settle x402 micropayments in USDC on Base
  • —Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions

Not for

  • —High-volume production workloads where $0.02/request adds up significantly
  • —Users who need detailed API documentation, schemas, or SLA guarantees before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/396 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/396
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schemas, and no examples. The actual functionality behind this specific endpoint is undescribed beyond the generic label 'Premium API Access'. All doc pages return only 'Connect wallet' with no content.

Warnings

  • —No OpenAPI spec or request/response schema available for any endpoint
  • —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no useful content
  • —The specific functionality of /api/v1/payments/396 ('Premium API Access') is not documented — unclear what it actually returns
  • —No examples or sample payloads are available anywhere on the site

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:24:06Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/2qH2eV
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart