x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/138

What it does

lowpaymentfee.com is a platform offering a suite of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/138` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises 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. However, the `/api/v1/charges/138` endpoint's description is simply "Premium API Access" with no further documentation on what data or functionality it returns.

Documentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what the endpoint actually does or what response to expect.

Capabilities

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

Use cases

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

Fit

Best for

  • —Developers wanting zero-signup, 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 needing detailed API documentation or guaranteed SLAs before purchasing
  • —Anyone without a Base-compatible wallet or USDC balance
  • —High-volume consumers who need bulk pricing or rate-limit guarantees

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/138 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/138
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what the endpoint actually returns. The /docs and other pages are empty. This is effectively a stub listing.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema describing request parameters or response format for /api/v1/charges/138
  • —The endpoint description is generic ('Premium API Access') with no specifics on functionality
  • —Cannot determine what data or service this specific endpoint provides

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:16:35Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/4ugL6Q
x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys. — Clawmart · Clawmart