{"service":"x402 micropaid APIs: UK VAT calculator + GPU/cloud price feed (x402 pay-per-call)","price":"0.005 USDC per successful call on each paid endpoint (Base mainnet, x402 v2 exact scheme). Invalid input (400) or upstream unavailable (503) is not charged.","network":"eip155:8453","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0xc1d2A86AeC4c63f9eFb0BaF5410C560B652291CE","facilitator":"https://facilitator.payai.network","endpoints":{"POST /v1/vat-calc":"JSON body: {net|gross, rate?, description?, kind?} or {lines:[...]} or {monthly_taxable_turnover:[...], threshold?}; markdown?: true","GET /v1/vat-calc":"Query: ?net=1500&rate=standard  or  ?gross=126&rate=reduced  (rate: standard|reduced|zero|exempt|outside-scope|<percent>)","POST /v1/gpu-prices":"GPU cloud price feed. JSON body (all optional): {query, provider: aws|azure|oci|all, offer_type: on_demand|spot|any, region, min_gpus, max_price_per_hour, max_price_per_gpu_hour, include_fractional, sort: price_per_gpu_hour|price_per_hour, limit: 1-100}. On-demand on AWS/Azure/OCI; Spot is Azure-only (no L40S Spot in this snapshot). Spot rows with price identical to on-demand for the same instance are dropped as non-discount. Cached snapshot of official public price lists (see as_of/freshness) — NOT live, not a quote. Vast.ai excluded (ToS). Data-centre GPUs only, no consumer GPUs.","GET /health":"free","GET /":"free (this page)","GET /v1/gpu-prices":"Same GPU price feed via query string, e.g. ?query=h100&limit=5 (same filters as POST; same 402/x402 payment).","GET /v1/gpu-row-digests":"free: every (id, row_sha256) pair + snapshot_root_sha256 and the exact hash spec, to verify paid GPU rows","GET /v1/receipts/{request_id}":"free: settlement receipt (Base tx hash, payer, network) for a paid call; request_id is in every paid response body and the X-Request-Id header. The PAYMENT-RESPONSE header on the paid response also carries tx + payer.","GET /openapi.json":"free (OpenAPI 3.1)","GET /.well-known/x402":"free (x402 discovery)","POST /mcp":"MCP streamable-HTTP. Discovery is free (initialize, tools/list, ping, notifications). tools/call (get_gpu_prices, uk_vat_calc) requires the same x402 payment: 0.005 USDC on Base — unpaid calls get HTTP 402 + PAYMENT-REQUIRED; retry with PAYMENT-SIGNATURE (or X-PAYMENT).","GET /.well-known/mcp-registry-auth":"free (MCP registry domain proof)"},"example_request":{"net":1500,"rate":"standard","description":"Consulting fee"},"example_requests":{"POST /v1/vat-calc":{"net":1500,"rate":"standard","description":"Consulting fee"},"POST /v1/gpu-prices":{"query":"h100","limit":5}},"disclaimer":"VAT: arithmetic and UK VAT rules summary only, not tax, legal or accounting advice. GPU prices: indicative list prices from a cached snapshot, not live, not a quote, not financial advice."}