x402basequality 0.35

Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/apikeys/17

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.

The specific endpoint at `/api/v1/apikeys/17` is listed as "Premium API Access." Based on the x402 challenge, it accepts POST requests and charges up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is settled via the x402 "exact" scheme to the specified payTo address. The platform also advertises sibling 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 further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoints actually return. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.

Capabilities

x402-paymentusdc-basepay-per-requestapi-key-generationdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-quotesgeocodingutility-services

Use cases

  • —Acquiring premium API access tokens via a single micropayment
  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription
  • —Fetching real-time finance and crypto market data on a per-request basis
  • —Using utility services like geocoding, validation, and conversion without API key management
  • —Agent-driven programmatic access to diverse API endpoints with x402 payment

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over traditional API subscriptions

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Developers who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/17 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/17
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples of what this endpoint actually returns or what inputs it expects. The listing is effectively a stub.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'
  • —No OpenAPI or schema describing request body or response format for this endpoint
  • —No examples of actual API responses anywhere on the site
  • —Purpose of '/api/v1/apikeys/17' specifically (vs other endpoints) is unclear beyond the label 'Premium API Access'

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:22:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/QPAQ8T
Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart