x402 paid data gateway

SourceStrand sells compact data products that humans and AI assistants can inspect before paying.

Start with a free sample or preview, inspect the product JSON, then call a paid endpoint. Unpaid paid calls return HTTP 402 with machine-readable x402 payment instructions.

Open AI offer JSON Try Crypto sample Try Procurement preview
3 productsCompany, procurement, and crypto signal packs behind the same gateway.
From $0.01Lowest paid endpoint price; samples and previews stay free.
59,722 procurement rows32,998 notices and 26,724 awards loaded.
x402 + USDCPaid routes return 402 first, then accept signed x402 payment headers.
Fastest path for human buyers

Pick a product, open the free JSON, then call the paid endpoint once without payment. The 402 response tells your x402 client exactly what to sign and retry.

  • No wallet secret is sent to this API; signing happens in the buyer client.
  • Use x-buyer-hint: partner-or-campaign-name for attribution without exposing secrets.
  • Outputs include lineage, limitations, timestamps, and source hashes for downstream audit.
Company

Taiwan Company Intelligence

Compact company brief snapshots for Taiwan business_id lookups and agent preflight context.

Paid from $0.01.

Product JSON GET https://api.sourcestrand.com/samples/tw-company-brief.json GET https://api.sourcestrand.com/v1/paid/tw-company/brief?business_id=24888323&buyer_hint=web-home
Procurement

Taiwan Procurement & Supplier Signals API

Official-source tender and award signals for market research, incumbent supplier discovery, and account targeting.

Agent research from $0.01.

Product JSON GET https://api.sourcestrand.com/v1/preview/tw-procurement/agent-research?q=IT%20services&buyer_hint=web-home GET https://api.sourcestrand.com/v1/paid/tw-procurement/agent-research?q=IT%20services&buyer_hint=web-home
Crypto

Crypto Agent Signal Pack

Not a raw price API. Precomputed BTC, ETH, SOL, SUI, ADA, token, and x402 ecosystem signals with 30m, 1h, 4h, 6h, 8h, and 24h trend windows for AI-agent workflows.

Mainstream asset signal from $0.01.

Product JSON GET https://api.sourcestrand.com/samples/crypto-agent-signal-pack.json GET https://api.sourcestrand.com/v1/paid/crypto/asset-signal?asset=BTC&buyer_hint=web-home GET https://api.sourcestrand.com/v1/paid/crypto/x402-ecosystem-brief?buyer_hint=web-home
Machine-readable catalog

AI assistants can fetch product cards, pricing, endpoint templates, free validation URLs, and purchase flow notes.

Open ai-offer.json GET https://api.sourcestrand.com/ai-offer.json
Free procurement search

Limited preview for keyword, agency, supplier, case name, or case number discovery.

Open tender preview GET https://api.sourcestrand.com/v1/preview/tw-procurement/tender-search?q=IT%20services&buyer_hint=web-home
Crypto token snapshot

Use when an agent already has chain and address and needs compact context, multi-window trends, data quality, and limitations.

GET https://api.sourcestrand.com/v1/paid/crypto/token-risk-snapshot?chain=base&address=0x1111111111111111111111111111111111111111&buyer_hint=web-home
Inspect sample shapes

All samples are free and safe for AI assistants to read before deciding which paid endpoint to call.

Company sample GET https://api.sourcestrand.com/samples/tw-procurement-supplier-signal.json GET https://api.sourcestrand.com/samples/crypto-agent-signal-pack.json
Health check

Simple gateway status endpoint for uptime checks.

Open health GET https://api.sourcestrand.com/health
How payment works

Paid endpoints require x402 payment. Without a valid payment header, they return HTTP 402 and the accepts array for the selected product.

GET paid endpoint -> receive 402 -> sign x402 payment -> retry with x-payment
Product boundaries

Company and procurement outputs are factual data products. Crypto outputs are informational signal packs and include not_financial_advice: true.

  • No legal, tax, accounting, credit, procurement, or investment advice.
  • Absence of data is not converted into a risk clearance.