x402basequality 0.30

Pay-per-call API key generation 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/apikeys/29

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across 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. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/apikeys/29` is listed as "Premium API Access." Based on the x402 challenge, it accepts POST requests and charges up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, 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 usage examples available from the crawled material. The actual functionality behind this specific endpoint and the other listed endpoints cannot be verified from the available information.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestapi-key-generationno-rate-limits

Use cases

  • —Acquiring API access keys via per-call micropayments without subscriptions
  • —Programmatic access to data, AI, finance, and utility endpoints with no upfront commitment
  • —Agent-driven API consumption where each call is independently settled on-chain

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that need to autonomously purchase API calls via x402
  • —Users who prefer on-chain USDC settlement over traditional billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/29 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/29
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation beyond the landing page listing. No OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The actual functionality behind this endpoint is unverifiable.

Warnings

  • —No OpenAPI specification or request/response schema available
  • —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
  • —The specific behavior of /api/v1/apikeys/29 ('Premium API Access') is undocumented — it is unclear what this endpoint returns
  • —Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function as described

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:19:28Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/rD9Z3r
Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart