x402basequality 0.30

Pay-per-call premium API access 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/charges/277

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, text 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, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.

The specific endpoint `/api/v1/charges/277` is labeled "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts POST requests and returns application/json responses. The payment timeout is 300 seconds.

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. It is unclear what specific data or functionality the `/api/v1/charges/277` endpoint provides beyond the generic "Premium API Access" label. The site appears to be a demonstration or early-stage platform for x402-gated APIs.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apino-api-keypost-method

Use cases

  • —Accessing pay-per-request APIs without needing API keys or subscriptions
  • —Making USDC micropayments on Base for on-demand API calls
  • —Integrating x402-compatible agents with low-cost data or utility endpoints

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —x402-compatible AI agents needing low-friction endpoint access
  • —Users who prefer crypto-native payment rails over traditional billing

Not for

  • —Users needing detailed API documentation or guaranteed SLAs
  • —Applications requiring high-throughput with predictable bulk pricing
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/277 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/277
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific functionality behind '/api/v1/charges/277' is completely opaque — only the generic label 'Premium API Access' is provided. The site's docs pages are empty beyond wallet-connect prompts.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages are all empty (only show 'Connect wallet')
  • —No OpenAPI or schema describing what this endpoint actually does or what it returns
  • —The endpoint path '/api/v1/charges/277' does not match any of the advertised API categories on the homepage
  • —Unclear what specific data or service 'Premium API Access' provides — may be a generic or demo endpoint

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:38:16Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

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