x402basequality 0.30

Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.

The specific endpoint `/api/v1/charges/211` is labeled "Premium API Access" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns application/json.

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 this particular endpoint actually returns. The site's landing page lists many API paths but provides no detail on request parameters or response formats. Without additional documentation it is unclear what specific data or functionality the `/api/v1/charges/211` path provides beyond the generic "Premium API Access" label.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responseno-api-keypost-method

Use cases

  • Programmatic access to premium API services with per-call USDC micropayments
  • Agent-driven API consumption without pre-registration or API key management
  • On-chain settled API calls for trustless, permissionless integrations

Fit

Best for

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

Not for

  • Users needing detailed API documentation or guaranteed SLAs before purchasing
  • High-volume consumers who would benefit from bulk pricing or subscriptions
  • Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/211 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what 'Premium API Access' at /api/v1/charges/211 actually returns. This is effectively a stub listing.

Warnings

  • No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
  • No OpenAPI or schema describing request parameters or response format
  • The specific functionality of /api/v1/charges/211 ('Premium API Access') is undefined — it does not match any of the named endpoints listed on the homepage
  • Cannot verify what data or service is actually delivered after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:38:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access