x402basequality 0.30

Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/353

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The specific endpoint at `/api/v1/payments/353` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The response MIME type is application/json. The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.

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 documentation, and no usage examples available from the crawl. The actual functionality behind this specific endpoint (payments/353) and most other endpoints cannot be verified from the available material.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keyjson-responsepost-method

Use cases

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

Fit

Best for

  • —Developers wanting zero-signup, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/353 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/353
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind '/api/v1/payments/353' is completely undocumented. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema specification found for any endpoint
  • —The actual functionality of /api/v1/payments/353 ('Premium API Access') is not described anywhere
  • —Cannot verify what data or service is returned after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:05:13Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/ACYBP8
Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart