x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/59

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call 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 Base with no API keys, no rate limits, and no minimum commitments.

The specific endpoint `/api/v1/charges/59` is labeled "Premium API Access" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. The response MIME type is application/json, and the endpoint accepts HTTP POST requests.

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 examples available. It is unclear what specific data or functionality the `/api/v1/charges/59` endpoint returns, as the site's landing page lists many different API categories but does not map charge IDs to specific services. The endpoint is confirmed live (402 challenge captured successfully).

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responseno-api-keyhttp-post

Use cases

  • —Programmatic access to paid API services without traditional API key management
  • —Agent-driven pay-per-call workflows settled in USDC on Base
  • —Accessing data, AI, finance, or utility endpoints with per-request micropayments

Fit

Best for

  • —Developers or agents wanting keyless, pay-per-use API access
  • —Crypto-native applications that can sign USDC payments on Base
  • —Low-volume or bursty workloads where per-request pricing is preferable to subscriptions

Not for

  • —Users who need detailed API documentation or request/response schemas before integrating
  • —High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans
  • —Users without a Base-compatible wallet or USDC balance

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/59 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/59
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no indication of what this specific charge ID actually returns. The docs pages are all empty wallet-connect prompts.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content
  • —No OpenAPI or schema provided; request body format and response structure are unknown
  • —The specific functionality of /api/v1/charges/59 ('Premium API Access') is ambiguous — it is unclear which of the listed services it maps to
  • —No examples or sample responses available anywhere in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:05:23Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/4CbrVQ
x402-gated premium API access on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart