x402basequality 0.30

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/charges/201

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/201` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum charge of 20,000 base units, which equals $0.02 per request (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 lowpaymentfee.com 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 specific endpoint probed here (`/api/v1/charges/201`) does not clearly map to any of those named services — its description is simply "Premium API Access" with no further documentation on what data or functionality it returns.

Documentation is extremely sparse. 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 documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body to send 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 keys
  • —Programmatic pay-as-you-go access to data or utility services

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously
  • —Users already holding USDC on the Base network

Not for

  • —Anyone needing detailed API documentation or guaranteed SLAs before integrating
  • —Use cases requiring free or subscription-based pricing models
  • —Developers unfamiliar with x402 payment protocol or crypto wallets

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/201 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/201
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid 402 x402 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. No OpenAPI spec, no examples, and the docs pages are empty. The listing is effectively a stub.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
  • —The endpoint path '/api/v1/charges/201' does not match any of the named API endpoints listed on the homepage; its actual functionality is unknown.
  • —No request or response schema is documented; callers cannot know what to send or expect back.
  • —No OpenAPI or machine-readable spec is provided.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:32:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/s89q5Z
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart