x402basequality 0.30

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/351

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/351` 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 X-PAYMENT header with a valid x402 payment proof.

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, the specific functionality behind the `/api/v1/payments/351` endpoint is not documented beyond its title "Premium API Access." The crawled docs, pricing, and README pages returned only a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what data or service it provides.

Capabilities

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

Use cases

  • —Accessing premium API services with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints

Fit

Best for

  • —Developers wanting keyless, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously
  • —Users comfortable paying in USDC on the Base L2 network

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —Applications requiring free or subscription-based pricing models
  • —Users who cannot transact in USDC on Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/351 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/351
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/request. However, there is no documentation of what the endpoint actually does, no OpenAPI spec, no request/response schemas, and no examples. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed liveness.

Warnings

  • —No documentation available for what /api/v1/payments/351 actually returns or accepts as input
  • —No OpenAPI or schema specification found anywhere on the site
  • —Docs, pricing, and README pages returned only 'Connect wallet' with no content
  • —The specific purpose of 'Premium API Access' is undefined — it may be a generic or placeholder endpoint

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:04:44Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/GBr2tY
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart