x402basequality 0.35

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/charges/251

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, 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 subscriptions are required — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/charges/251` is listed as "Premium API Access" and requires a maximum of 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The x402 challenge confirms the endpoint is live, accepts the `exact` payment scheme on Base, and responds with `application/json`. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual request/response schemas for individual endpoints are unknown. Without documentation or OpenAPI specs, it is unclear what input parameters each endpoint expects or what response structures they return.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networkjson-responseno-api-keyno-rate-limits

Use cases

  • —Accessing miscellaneous API services (analytics, AI, finance, utilities) without needing API keys or subscriptions
  • —Making one-off API calls with instant USDC micropayments on Base
  • —Integrating pay-per-request endpoints into agent workflows via x402 protocol

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over traditional API billing

Not for

  • —Users who need detailed API documentation and well-defined schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscription plans
  • —Developers who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/251 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/251
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no documentation, no request/response schema, and no examples. All doc pages beyond the landing page are empty ('Connect wallet'). The purpose of this specific endpoint (/api/v1/charges/251) is unclear beyond the generic label 'Premium API Access'.

Warnings

  • —No OpenAPI or schema documentation available — all doc/pricing/API pages return only 'Connect wallet'
  • —The specific functionality of /api/v1/charges/251 ('Premium API Access') is undocumented and unclear
  • —Request and response formats are entirely unknown; no examples exist in crawled material
  • —The platform lists many endpoints on its landing page but none have documented input/output contracts

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:35:31Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/beCh77