Every agent-payable API.

Resolve a company name to canonical public identifiers in one call: GLEIF LEI (with registered country, city and status), SEC CIK and ticker, and Wikidata QID, returned as ranked candidates with a name-similarity score. Company disambiguation and KYB from public registries, freely redistributable.

One-call counterparty check: wallet activity profile (EOA vs contract, balances, tx count, risk flags) plus OFAC SDN sanctions screening, resolved into a single clear/blocked verdict. Reports 'unscreened' rather than 'clear' if the sanctions list could not be consulted.

One-call token due diligence: structural rug/safety scan, live liquidity and market depth, optional dev activity, resolved into a single ok/caution/avoid verdict with the flags that drove it.

Full x402 market-intelligence report from a complete CDP Bazaar dump: demand-to-supply ratio for every tag with HOST CONCENTRATION so an incumbent's garden is not mistaken for an opening, price percentiles for resources that actually earn (broken out by category), the high-value tier charging $50-$3,208 per call, and calls-per-payer retention for the top 30 earning hosts. Answers what to build, what to charge, and what to avoid. Free preview at GET /intel/x402/preview.

One-call chain health: current gas cost and congestion level, 30-day TVL trend, and recent exploits filtered to that chain, resolved into a healthy / mixed / strained verdict. Supports base, ethereum, arbitrum, optimism, polygon, bsc.

One-call crypto market regime: total market cap and 24h change, Fear & Greed sentiment, and perp funding/open interest, resolved into risk-on / neutral / risk-off plus a crowded-long / crowded-short positioning read. Surfaces leverage fragility that price alone does not show.

What is the actual answer to this question, according to the live web right now? Runs a multi-engine search, reads the top pages, and returns one synthesised answer with inline [1][2] citations and the source URLs behind them — the whole search-read-summarise loop in a single paid call instead of a dozen

One-call company and domain profile from public records: RDAP registration (age, registrar, status, expiry, nameservers) plus certificate-transparency history for infrastructure footprint and subdomain discovery, resolved into a new / established / mature maturity read. Domain-based lead qualification and counterparty vetting without a proprietary data licence.

Certificate-transparency history for a domain (crt.sh) — every TLS certificate issued, which doubles as subdomain discovery

ElevenLabs text-to-speech: send text (up to 4000 chars) with optional voice_id, model, format, and speed; get back a hosted audio_url plus size and content type. Send 'Accept: audio/mpeg' to stream raw audio bytes directly instead. Voice catalog with free preview clips at GET /voices (no payment). Priced per character; the 402 amount is computed from your text length.

[BATCH+PROOF] x402 service graveyard - services that vanished from the census. THRESHOLD stated plainly: listed on FIRST confirmed absence (confirm_absences=1), NOT multi-day confirmation - only two snapshot days exist, which cannot support a streak test. Rows are hash-backed and recompute offline with ?verifiable=1; record_hash_verifiable reports the exact count per response. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

[SIGNAL+PROOF] Demand record for one x402 service (?service=): demand_class (REAL/SOLO/PROBE/WASH), calls_30d, unique_payers_30d, score_total, liveness_state, lifecycle, record_hash. Model demand-v1, refreshed daily from the public CDP catalogue; score_total is an ordering key, not a rating. DEGRADED DELIVERY, see unavailable_fields - tier, verified, action_hint and the five-axis sub-scores are empty. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

One grant, one project: a deterministic eligibility verdict with the full criteria table - each criterion quoted from the grant's own eligibility text, marked pass/fail/undeclared - plus what is missing to firm the verdict up and indicative funding. Criteria are parsed once at ingest (never guessed at request time); an unparseable grant honestly answers 'uncertain', never a fabricated verdict.

Check any UK company is real, active and safe to deal with. One call returns Companies House registration, filing health, officer stability and an FCA-regulation cross-check as clean JSON with a 0-100 risk verdict, named flags you can audit, and a two-sentence plain-English narrative. Scores are computed by deterministic rules, never by a language model.

Native balance for a wallet address, with one consistent response shape across Ethereum, Base, Bitcoin, and Solana -- no need to integrate each chain's RPC/explorer separately yourself.

Check up to 10 wallets in one call -- mix chains freely (e.g. an Ethereum wallet and a Solana wallet in the same request). Cheaper per item than calling wallet-balance that many times separately. A bad address in the batch doesn't fail the whole call -- that item just comes back with an error, the rest still succeed.

The flagship: balance, token holdings, recent activity, USD portfolio value, and an OFAC sanctions-list check for a wallet, in one call -- across Ethereum, Base, Arbitrum, Optimism, Polygon, Bitcoin, and Solana. Cheaper and simpler than calling wallet-balance + token-holdings + address-activity separately. Sanctions screening only (not a general scam detector) -- an honest, narrower claim, not a vague safety score.

Look up VAT and company registration identifiers for one website domain.

Verify the OpenAI-compatible base URL, model list contract, request shape, secret boundary, and next key-pack route before buying a URL + API key quota pack.

Build receipt-bound execution policy for x402 payment responses and receipt URLs.

Generate buyer-owned signing safety controls and private-key boundary rules.

Rich market data for one or more cryptocurrencies: rank, 24h high/low, volume, ATH, and more

Look up current price, 24h change, and market cap for one or more cryptocurrencies

Get the top trending cryptocurrencies right now, ranked by search interest

Rank blockchains by total DeFi value locked (TVL) across all protocols

Look up a DeFi protocol's current total value locked (TVL), by chain, plus market cap

Aggregated demand data from one provider's own paid x402 routes: requests and price requests per route and day, outcomes by HTTP status, settled payments with conversion and repeat rate, caller classes and country distribution. Not a market sample. Raw identifiers and payer addresses are never returned. Measurement started 2026-07-23.

Resolve an ENS name to an address, or reverse-resolve an address to its primary ENS name

Verify and lint a third-party x402 endpoint without paying it. Probe the live HTTP 402 challenge, validate x402 v2 and Base payment requirements, and check exact Coinbase Bazaar and 402index listing evidence before a buyer authorizes payment.

Pre-action check for AI agents: inspect an unfamiliar live x402 v2 challenge immediately before purchase. Verify price, network, payee, resource binding, timeout, and Bazaar metadata without paying the target or forwarding credentials. POST probes send only a fixed empty JSON object; callers cannot supply target request content.

Current gas price and EIP-1559 fee estimate for a chain (base, ethereum, polygon, arbitrum, optimism)

Heartbeat endpoint billed via a batch-settlement payment channel

x402 seller attribution intelligence: reported calls versus catalog-attributed on-chain USDC flow, payer-address concentration and forensic signals. Attribution is not protocol or fraud proof.

x402 market intelligence with current catalog-attributed USDC flow, address-level demand signals and separately labeled value-matched history. Attribution is not exclusive protocol-intent proof.

Get full detail (yes/no prices, volume, status, result) for a single Kalshi market by ticker

x402 Market Feed: ranked paid-resource demand signals from x402 discovery, including 30-day calls, unique payers, price, estimated gross revenue, tags, and niche summaries for agents deciding what API to build or buy.

The x402 ecosystem thermometer: how many services and resources are listed in the public bazaar right now (cached hourly). Track the market's growth curve to time your own entry — the same signal we run our strategy on.

Safelisted read-only JSON-RPC proxy across major EVM chains (base, ethereum, polygon, arbitrum, optimism) — eth_call, eth_getBalance, eth_getTransactionReceipt, eth_getBlockByNumber, and more

Get full detail (prices, volume, liquidity, resolution) for a single Polymarket market by slug

x402 Preflight: HTTP readiness check for x402 API buyers, sellers, and listing agents. It probes a target paid URL plus same-origin /.well-known/x402 and /openapi.json, /llms.txt, /agent-catalog.json, and /.well-known/ai-plugin.json, then returns payment-challenge signals, parsed payment metadata, comparable Bazaar resources, pricing context, discovery health, LLM/catalog readiness, conversion-readiness verdict, score, issues, and next actions. No payment is made to the target endpoint.

Build a buyer-ready x402 resource shortlist from seller route inventory.

Generate a deterministic MCP and Claude Desktop buyer integration kit with x402 quote, spend-cap, receipt, and same-request retry instructions.

Audit any x402 service's discovery surface: catalog, /.well-known/x402, llms.txt, openapi.json, agent-card, mcp-tools. Returns per-check status and the gaps costing you autonomous buyers. Built from the checklist that runs this service.

Usage-based text generation, billed by output length (max $0.05/request)

Trend insights for a topic, with a premium tier for the full breakdown

Validate JSON, sort object keys, and return a stable normalized string and hash.

Native and (optional) ERC-20 token balance for a wallet address across major EVM chains (base, ethereum, polygon, arbitrum, optimism)

Live current weather conditions for any city, sourced from Open-Meteo

Real-time web search (via Exa) — ranked results with title, URL, published date, author, and relevance score for a query

x402 market snapshot: index totals, network split, price distribution, top providers and recipients. By x402 Radar.