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/316

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/316` is labeled "Premium API Access" and accepts POST requests. It returns an x402 challenge requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by micropayment.

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 endpoint actually returns. The site's landing page lists many endpoint paths but provides no detail on input parameters or output formats. Because of this, the actual functionality behind `/api/v1/charges/316` is unclear — it may be a generic charge endpoint or a gateway to one of the listed services.

Capabilities

x402-paymentusdc-micropaymentbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Accessing premium API services without traditional API key registration
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven programmatic access to data, AI, or finance endpoints via micropayments

Fit

Best for

  • —Developers who want keyless, pay-as-you-go API access
  • —AI agents that can settle x402 micropayments autonomously
  • —Users who prefer crypto-native payment rails over subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/316 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/316
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty ('Connect wallet' only). The actual functionality behind this specific charge endpoint is unclear, making this effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — input/output formats are unknown.
  • —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content.
  • —The specific purpose of /api/v1/charges/316 ('Premium API Access') is vague — it is unclear what data or service it provides.
  • —The site lists many endpoints but none have documented parameters or response formats.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:50:55Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

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