x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/19

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment to access any endpoint.

The specific endpoint at `/api/v1/charges/19` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.

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 data or models back each endpoint. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what request body format is expected or what response payload is returned.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keydata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-quotesgeocodingutility-services

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without managing API keys
  • —Fetching real-time crypto token quotes and gas estimates via micropayment
  • —Running geocoding or data conversion utilities on a per-request payment basis
  • —Integrating pay-as-you-go analytics and data export into agent workflows

Fit

Best for

  • —Agents or developers who want zero-signup, pay-per-call API access
  • —Use cases requiring small, infrequent API calls where subscriptions are overkill
  • —Crypto-native workflows that can settle payments in USDC on Base

Not for

  • —High-volume production workloads needing guaranteed SLAs and detailed documentation
  • —Users who need well-documented request/response schemas before integration
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/19 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/19
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what the 'Premium API Access' endpoint actually returns. The catalog of endpoints is listed on the homepage but none have documented inputs or outputs.

Warnings

  • —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content
  • —No OpenAPI or schema available — request body format and response structure are unknown
  • —The specific endpoint /api/v1/charges/19 is labeled 'Premium API Access' with no further description of its function
  • —Cannot verify what data or models back any of the advertised endpoints

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:20:26Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/dQ2Hrp
Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart