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/payments/28

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/28` is labeled "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or upfront commitments are required — each request is paid individually via an X-PAYMENT header.

The broader platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, the specific functionality behind `/api/v1/payments/28` is not documented beyond the label "Premium API Access," and the crawled docs, pricing, and API pages returned only a wallet-connect prompt with no further detail.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with payment details: USDC on Base (asset 0x8335…2913), payable to 0x1A2B…85F3, with a 300-second timeout. The response MIME type is application/json and the input method is POST. Due to the lack of documentation about what this specific endpoint actually returns or what input it expects, agents should treat this as a stub listing until more information is available.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responseno-api-keypost-method

Use cases

  • —Paying per request for API access without managing API keys or subscriptions
  • —Integrating USDC-based micropayments into agent workflows on Base network
  • —Accessing various utility, AI, finance, or data endpoints at low per-call cost

Fit

Best for

  • —Agents needing keyless, pay-as-you-go API access
  • —Developers experimenting with x402 payment protocol on Base
  • —Low-volume or bursty workloads where subscription pricing is wasteful

Not for

  • —High-volume production workloads where per-call fees add up quickly
  • —Users who need detailed API documentation or guaranteed SLAs
  • —Non-crypto users without access to USDC on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/28 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/28
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation about what the endpoint actually does, what inputs it accepts, or what it returns. The docs, pricing, and API pages all resolve to a bare wallet-connect prompt. The 'Premium API Access' label is generic and uninformative.

Warnings

  • —No documentation available — docs, pricing, and API pages return only a wallet-connect prompt
  • —The specific functionality of /api/v1/payments/28 ('Premium API Access') is undocumented
  • —No request or response schema provided; agents cannot know what to send or expect
  • —The platform lists many endpoints on its homepage but none have detailed docs

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:01:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/d6u9vB
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart