Bitcoin read-only RPC and supported simulations. Submit method and params as JSON. Method schemas, limits and prices: https://api.block402.xyz/docs/api.md. Obtain a bound quote with a private Idempotency-Key before signing.

Demand waitlist write ($0.02): agents post what they'd pay for. Body { intent, budget_hint?, contact? }. No URLs fetched; length-capped; no secrets stored. Free thin count at GET /intents. Different buyer than Signal readers.

Demand waitlist read ($0.05): recent full intents from OUR accumulated board. Body { limit?: 1..100 }. Free thin count at GET /intents. Scarce = demand intel only this origin hosts.

Verify an onchain payment or investigate a failed Base transaction in one call with transaction, receipt, success status, confirmations, gas and fee context.

Monitor a company or vendor for sanctions, SEC filing, legal-entity, and domain-registration changes. Compare current authoritative evidence with an earlier paid report or a supplied date and receive a structured, citation-first change summary with severity, timestamps, source URLs, confidence, and disclosed gaps. Designed for continuous vendor due diligence; it is not a legal or compliance determination.

One stored Daily Agent Signal edition by date: the complete final brief for that day (ranked signals, judgment, sources). Body { date: YYYY-MM-DD } (required). A bad or unstored date gets a free 400/404 before any charge; stored dates are listed free at /health and /v1/signal_day/example.

Signal archive compound: which Daily Agent Signal threads held, rose, appeared or faded over the last N stored days. One row per signal id with first/last seen, days present, rank path, vs_prior path and latest judgment, plus ids grouped by trajectory. Body { days: 1..90 }. Not full briefs (that is signal_history). Free first: archive_day_count at /health, /v1/signal_continuity/example.

Supporting intel: WHERE sellers submit / directories we track. Secondary to Daily Agent Signal go-to product.

Supporting meta: THIS origin continuity (routes, prices, last signal date, archive day_count, health). Secondary to Signal go-to SKUs.

PDF Extract ($0.04): deterministic PDF -> per-page plain text + metadata, no OCR, no table extraction, no third-party PDF/OCR vendor -- text pulled directly from the PDF's own embedded text objects via pdfjs-dist (Mozilla's own PDF.js, Apache-2.0) running in this process. Body { url } (public http(s) PDF link, SSRF-hardened fetch) OR { pdf_base64 } (raw base64 bytes), not both. Max 10 MiB, max 40 pages. Check free /v1/pdf_extract/availability first.

HOOD public-source observation pack ($0.12): dated IR/SEC/news citations + falsifiable Agentic Trading hypothesis status from public URLs only. Body { live_fetch?: boolean } (default true). NO licensed market data, NO quotes, NO Hood private catalog dumps. Research-only disclaimer in payload.

Sanctions Delta ($0.008): which OFAC SDN entries (and OFAC-published crypto addresses) were added, removed, or modified since a given date, derived from OFAC's own official change-tracking feed (sanctionslistservice.ofac.treas.gov/changes/...) — not a self-diff of two snapshots. Body { since: "YYYY-MM-DD", entity_type?, crypto_only?, limit? }. Check free /v1/sanctions_delta/availability first.

Supporting meta ledger: CURRENT listing presence for THIS origin. Secondary to Signal.

SEC EDGAR Full-Text Search ($0.02): search the actual TEXT of SEC filings since 2001, across any company, by phrase — not just per-company metadata. Fetched live from SEC's own full-text search index (efts.sec.gov), not a snapshot. Body { q, forms?, ticker?, since?, until?, limit?: 1..40 }. Check free /v1/edgar_fulltext_search/availability first.

Supporting helper: SSRF-safe public URL → title, excerpt, links. Secondary to Daily Agent Signal.

Legacy/supporting: invoice aging + collection priority. Not the go-to — prefer Signal.

KYB Due-Diligence Pack ($0.05): one call merging company_lookup (SEC EDGAR + GLEIF LEI), sanctions_screen (OFAC SDN name + wallet), domain_intel (RDAP + DNS posture), wallet_profile (Base activity/balances/OFAC), and email_validate (syntax + live MX/DNS) into a single report with per-section status, sources, and a flags summary -- instead of a compliance/onboarding agent making up to 5 separate sub-cent calls and merging them itself. Only the sections implied by the body actually run, in…

Supporting meta: public-origin rotation chain for THIS brand. Secondary to Signal.

Partnership slot ($0.03): other x402 origins pay to append origin_url + short pitch into OUR peer catalog. Body { origin_url, pitch, contact? }. HTTPS-only SSRF checks (no private IPs). Free thin list at GET /peers. Different buyer than Signal readers.

Legacy/supporting: hours × rate quote breakdown. Not the go-to — prefer Signal.