x402basequality 0.35

x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/127

What it does

lowpaymentfee.com is an x402-enabled API platform offering a suite of endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/charges/127` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The challenge uses the "exact" payment scheme with a 300-second timeout. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.

Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/charges/127` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to determine the actual functionality behind this specific route.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keydata-analyticsai-inferencefinance-datacrypto-datageocodingtext-summarizationsentiment-analysis

Use cases

  • —Agents needing on-demand API access without managing API keys or subscriptions
  • —Pay-per-request AI inference (sentiment, summarization, classification, embeddings)
  • —Fetching real-time crypto token quotes and gas estimates
  • —Geocoding and data validation utilities with no rate limits

Fit

Best for

  • —AI agents that need keyless, pay-as-you-go API access
  • —Developers prototyping with low-cost per-call pricing on Base
  • —Web3-native applications that can settle in USDC

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume production workloads where $0.02/request adds up significantly
  • —Users without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/127 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/127
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/charges/127 actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format for this endpoint
  • —The specific functionality of /api/v1/charges/127 ('Premium API Access') is undefined — it is unclear what data or service it provides
  • —No request or response examples available anywhere in crawled content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:15:36Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/tj8xM7
x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys. — Clawmart · Clawmart