x402basequality 0.35

Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/55

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.

The specific endpoint `/api/v1/payments/55` is labeled "Premium API Access" in the x402 challenge but its exact functionality is not documented beyond that label. The provider's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), all at the same $0.02 price point. It is unclear whether `/api/v1/payments/55` maps to one of these or is a distinct resource.

The x402 challenge confirms the endpoint is live, accepting POST requests, settling payments in USDC (contract 0x8335…2913) on Base network. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments
  • —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 zero-commitment, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —Anyone without a Base-compatible USDC wallet or x402 client
  • —High-volume consumers who would benefit from bulk pricing or subscriptions

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/55 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/55
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation on what this specific endpoint actually returns, no OpenAPI schema, no example requests or responses, and the crawled docs/pricing/API pages all rendered as just 'Connect wallet' with no useful content. The exact purpose of /api/v1/payments/55 is unknown.

Warnings

  • —The exact functionality of /api/v1/payments/55 ('Premium API Access') is undocumented — it is unclear what data or service it provides.
  • —All documentation, pricing, and API pages beyond the landing page returned only 'Connect wallet' with no substantive content.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —The provider lists many endpoints on its landing page but none match the /api/v1/payments/55 path, raising questions about what this endpoint does.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:18:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/xtx6qq
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart