x402basequality 0.35

Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/247

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network via the x402 payment protocol, with a uniform price of $0.02 per call. 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/247` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e. $0.02) on Base. The payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and returns `application/json`.

The broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages only show a "Connect wallet" prompt), so the actual behavior and response schemas of individual endpoints are unknown.

Capabilities

x402-paymentper-request-billingusdc-baseno-api-keydata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-datageocodingutility-services

Use cases

  • —Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys
  • —Fetching real-time crypto gas estimates or token price quotes with per-call payment
  • —Geocoding or data conversion utilities paid per request via x402
  • —Building autonomous agent workflows that settle API costs on-chain in USDC

Fit

Best for

  • —Developers and agents wanting zero-signup, pay-as-you-go API access
  • —On-chain payment workflows using USDC on Base
  • —Low-cost per-request API consumption at $0.02/call

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —High-volume use cases where per-request on-chain settlement overhead matters
  • —Users without USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/247 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/247
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and all doc pages are empty stubs. The specific purpose of the /charges/247 endpoint beyond 'Premium API Access' is unclear, making this effectively a stub listing.

Warnings

  • —All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no actual content.
  • —No OpenAPI or schema available — request and response formats for this endpoint are completely unknown.
  • —The specific functionality of /api/v1/charges/247 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint.
  • —The broad catalog of 16+ endpoints advertised on the landing page could not be individually verified.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:36:25Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/X9JZLZ
Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart