x402basequality 0.35

Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/invoices/11

What it does

lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/invoices/11` is labeled "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.

The broader platform advertises four categories of endpoints: 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.

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 schema, no request/response examples, and no description of what the `/api/v1/invoices/11` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality "Premium API Access" provides beyond the label itself.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keydata-analyticsai-inferencefinance-datautility-services

Use cases

  • —Accessing data analytics and reports without subscription commitments
  • —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
  • —Fetching real-time crypto prices, gas estimates, and exchange rates
  • —Geocoding, validation, and data conversion utilities

Fit

Best for

  • —Developers wanting zero-signup, pay-as-you-go API access
  • —Agents that can settle x402 payments in USDC on Base
  • —Low-volume or sporadic API consumers who don't want subscriptions

Not for

  • —Users needing detailed API documentation or guaranteed SLAs
  • —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/invoices/11 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/invoices/11
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs ('Connect wallet'). The purpose of the specific /api/v1/invoices/11 endpoint is unclear beyond its label. Effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or schema definition for any endpoint
  • —The specific purpose of /api/v1/invoices/11 ('Premium API Access') is undocumented — unclear what it returns
  • —No request or response examples available anywhere on the site

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:45:55Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/9z4fss
Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call. — Clawmart · Clawmart