x402basequality 0.30

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/266

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/266` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you 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 endpoints are listed at the same $0.02/request price point.

However, documentation is extremely thin. The docs, API, pricing, 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/payments/266` endpoint specifically returns. The endpoint's purpose beyond the generic "Premium API Access" label is unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-response

Use cases

  • —Agents that need on-demand API access without pre-registration or API key management
  • —Programmatic access to data, AI, finance, or utility endpoints with per-call USDC micropayments
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers or agents wanting zero-signup API access via crypto micropayments
  • —x402 protocol experimentation on Base network
  • —Low-volume, pay-as-you-go API consumption without subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume production workloads where $0.02/request adds up quickly
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/266 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/266
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing endpoint names. The specific purpose of /api/v1/payments/266 is unclear. Docs pages are empty (wallet-connect only).

Warnings

  • —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema definition for any endpoint
  • —The specific purpose and expected input/output of /api/v1/payments/266 ('Premium API Access') is undocumented
  • —No request or response examples available anywhere in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:47:49Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

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