x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/111

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 `/api/v1/payments/111` is labeled "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.

The broader platform offers 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.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The x402 challenge confirms the endpoint is live and accepting POST requests, settling payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium API endpoints without signing up or managing API keys
  • —Making one-off paid API calls from autonomous agents using x402 USDC payments on Base
  • —Programmatic access to data, AI, finance, or utility services at $0.02 per request

Fit

Best for

  • —Agents or scripts that need keyless, pay-as-you-go API access
  • —Developers experimenting with x402 protocol integrations
  • —Low-volume consumers who want no subscription commitments

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume production workloads where per-request crypto payments add latency or cost overhead

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/111 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/111
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific endpoint ('/payments/111') is unclear beyond the generic label 'Premium API Access'. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — request and response formats are unknown.
  • —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content.
  • —The specific function of /api/v1/payments/111 ('Premium API Access') is not explained anywhere; it may be a generic demo or placeholder.
  • —No examples of successful responses are available from crawled content.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:31:01Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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