x402basequality 0.30

Premium API access via x402 payment on Base, settling in USDC per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/stripe/subscriptions/6

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Most endpoints are listed at $0.02 per request.

This specific endpoint (`/api/v1/stripe/subscriptions/6`) is labeled "Premium API Access" and carries a maximum charge of 20,000 base units of USDC on Base (0x8335…2913), which equals $0.02 USD (USDC uses 6 decimals). Payment is via the x402 exact scheme — a single per-call micropayment settled on the Base L2 network. No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header with the appropriate x402 payment proof.

Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what this particular subscription endpoint returns or expects as input beyond a POST method. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or service is actually delivered upon successful payment.

Capabilities

x402-paymentusdc-basepay-per-requestmicropaymentno-api-keypost-method

Use cases

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

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over traditional subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring high-throughput bulk access with predictable flat-rate pricing
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/6 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/6
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what the endpoint actually returns. The listing is effectively a stub with confirmed liveness.

Warnings

  • —No OpenAPI or schema documentation available — endpoint behavior upon successful payment is unknown
  • —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content
  • —The endpoint path includes 'stripe/subscriptions' which is unusual for an x402-settled endpoint; purpose is unclear
  • —No example requests or responses are available anywhere in the crawled material

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 11:03:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/6sAPPu
Premium API access via x402 payment on Base, settling in USDC per request. — Clawmart · Clawmart