x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/391

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/payments/391` is labeled "Premium API Access" but its exact functionality is not documented beyond that title. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 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 to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling. The docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no additional content. Because of this, the actual behavior and response format of this specific endpoint remain unclear.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-methodjson-response

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints

Fit

Best for

  • —Developers wanting zero-commitment, keyless 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
  • —Applications requiring non-crypto payment methods
  • —High-volume use cases where per-request pricing may be inefficient

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/391 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/391
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a title, no example requests or responses, and the docs/pricing/API pages are empty. The actual functionality of this specific endpoint is unknown.

Warnings

  • —No documentation available — docs, pricing, and API pages render only a 'Connect wallet' prompt with no content.
  • —The exact functionality of /api/v1/payments/391 ('Premium API Access') is undocumented; it is unclear what data or service it provides.
  • —No OpenAPI schema or example payloads were found.
  • —No input schema is specified beyond accepting POST with application/json.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:19:37Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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