x402basequality 0.35

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/39

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Each call costs $0.02 in USDC on the Base network, settled directly on-chain with no API keys, rate limits, or subscription commitments required.

The specific endpoint at `/api/v1/charges/39` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per request. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.

The broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities — all at the same $0.02/request price point. However, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.

Capabilities

x402-paymentper-request-billingusdc-baseno-api-keyjson-responsehttp-post

Use cases

  • —Agents that need on-demand API access without managing API keys or subscriptions
  • —Paying for individual API calls with USDC on Base for data, AI, or utility endpoints
  • —Prototyping integrations where per-request crypto billing simplifies access control

Fit

Best for

  • —Developers or agents wanting zero-setup, keyless API access
  • —Use cases where per-call micropayments in USDC are preferred over subscriptions
  • —Quick experimentation with pay-as-you-go pricing on Base

Not for

  • —High-volume production workloads where per-request on-chain payment adds latency and cost overhead
  • —Users who need detailed API documentation, request schemas, or response guarantees before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/39 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/39
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The actual functionality behind 'Premium API Access' at /charges/39 is undefined — it is unclear what data or service it returns. The docs pages are empty beyond a wallet-connect prompt.

Warnings

  • —No OpenAPI or schema documentation available; request body and response format are unknown.
  • —The /docs, /pricing, /api, and /README pages contain no usable content beyond 'Connect wallet'.
  • —The specific purpose of /api/v1/charges/39 ('Premium API Access') is not described anywhere — it may be a generic or placeholder endpoint.
  • —Cannot verify what the endpoint actually returns upon successful payment.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:08:50Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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