1,390 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Paid SMTP open-relay test (cycle 154) - actually attempts MAIL FROM + RCPT TO against each MX host. Resolves MX via Cloudflare DoH, opens TCP/25, sends EHLO + MAIL FROM:<external> + RCPT TO for both local-domain and fore...
Paid x402 buying-decision simulator (cycle 146, x402 $0.001) - fetch target's /.well-known/x402, compute per-route monthly_cost and value_at given calls_per_month + value_per_call_usd, classify buy / buy_conditionally /...
Paid MCP server tool-list cross-discovery-surface aggregator (cycle 150, x402 $0.001) - parallel-fetch /.well-known/mcp/server.json + /mcp.json + /openapi.json + 8 health endpoints; aggregates MCP tools across surfaces (...
Paid WebAuthn/FIDO2 ceremony decoder + validator (cycle 155, x402 $0.001) - decodes clientDataJSON + attestationObject for both register and assertion ceremonies; extracts rpIdHash + flags (UP/UV/BE/BS/AT/ED) + signCount...
Paid BIMI selector + rotation-cadence auditor (cycle 168, x402 $0.001) - probes 14 conventional BIMI selectors via Cloudflare DoH TXT (default._bimi.<d>, bimi._bimi.<d>, brand._bimi.<d>, logo._bimi.<d>, bimi1/_bimi2/_bim...
Paid RFC 7807 (Problem Details for HTTP APIs) conformance probe (cycle 168, x402 $0.001) - 6 candidate API paths (/api+/api/v1+/api/v2+/v1+/v2+/graphql) each probed with 5 malformed payloads (GET bad query / POST wrong C...
Paid x402 buyer receipt history (cycle 191, leak-closed cycle 193) - per-buyer call ledger + spend + 60-day by_day_series from the local access log. RE-gated: advertised at $0.001 but served free. via x402
Paid x402 buyer CLI template generator (cycle 191, leak-closed cycle 193) - GET ?route=&rounds=N returns a pre-filled runnable Python httpx+eth_account snippet that pays for one chosen route. RE-gated: it was advertised...
Paid buyer-side cost projection (cycle 187, x402 $0.001) - given a buyer's projected call volume and category mix, returns a monthly USDC spend estimate at THIS seller's catalog plus bundle-recommendation cost-reduction...
Paid buyer-side optimal-route shopper (cycle 187, x402 $0.001) - given a buyer's free-form intent string, ranks THIS seller's routes by Jaccard token similarity (with path-substring and path-token boosts) and returns top...
Paid x402 buyer-contract readiness card (cycle 200, x402 $0.001) - GET ?url=<SELLER_URL> (default: ourselves) answers the one question a buyer agent asks before spending USDC: can I parse the 402 challenge, is it the mon...
Paid x402 spec-surface conformance audit (cycle 200, x402 $0.001) - GET ?url=<SELLER_URL> probes the 9 discovery paths a spec-following AI agent fetches before it can select a paid endpoint: /.well-known/x402.json plus i...
Paid x402 marketplace liveness sweep (cycle 197, x402 $0.001) - GET ?url=<SELLER_URL> (comma-separated up to 6) or ?sample=N audits whether a LISTED x402 seller is actually PAYABLE before a buyer spends USDC. Parses 5 ca...
Paid x402 intent signal extractor (cycle 201, x402 $0.001) - ranks a seller's catalog against the intents a buyer agent arrives with. Reads the seller's llms.txt + manifest, extracts declared intents, token-matches each...
Paid x402 dispatch eligibility report (cycle 198, x402 $0.001) - GET ?url=<SELLER_URL> (default: ourselves) or ?sample=N answers the gate AFTER indexability: will a buyer-side router actually route a paid call here, or q...
Paid x402 Bazaar index presence audit (cycle 205, x402 $0.001) - GET ?url=<SELLER_URL> (default: self) OR ?pay_to=<ADDRESS> checks whether a seller is ACTUALLY LISTED in Coinbase CDP's x402 Bazaar -- the only keyless, pa...
Paid x402 Bazaar competitor gap (cycle 206, x402 $0.001) - GET ?url=<SELLER_URL> (default: self) finds out why a seller is invisible in the x402 Bazaar even when it passes validation. Fetches the seller's LIVE 402 and co...
Paid x402 settlement-path verifier (cycle 184, x402 $0.001) - GET ?route=<API_ROUTE>&amount=<ATOMIC> returns live seller-side proof of the FULL payment path: reads the seller USDC balance on Base via eth_call, probes the...
Paid multi-source search evidence card (cycle 218, x402 $0.01) - GET ?query=<TERMS> OR ?sample=1|2|3 OR POST application/json {query}. KEYLESS Wikipedia search API + OpenLibrary search API + Hacker News Algolia API -- no...
Paid x402 Bazaar demand map (cycle 206, x402 $0.001) - GET ?query=<WORDS> OR ?sample=N maps where the money actually moves inside Coinbase CDP's x402 Bazaar by reading the REAL 30-day demand data CDP publishes on every o...
Paid audiobook narration economics advisor (cycle 207, x402 $0.001) - GET ?title=<BOOK_TITLE>&author=<AUTHOR>&minutes=<N> OR ?sample=1|2|3 OR POST application/json {title, author, minutes, hourly_llm_rate_usd, tts_usd_pe...
Paid x402 Bazaar indexing readiness report (cycle 205, x402 $0.001) - GET ?url=<SELLER_URL> (default: self) OR ?path=<PATH> asks CDP's OWN keyless validator (POST api.cdp.coinbase.com/platform/v2/x402/validate) whether T...
Paid x402 seller trust dossier (cycle 197, x402 $0.001) - GET ?url=<SELLER_URL> (default: this seller's own public URL) assembles a single buyer due-diligence card from a seller's LIVE surface: who you pay (payTo/asset/n...
Paid FX rate impact analyser (cycle 209, x402 $0.005) - GET ?base=USD&symbols=EUR,GBP,JPY OR ?base=EUR¬ional=100000 OR ?sample=1|2|3 OR POST application/json {base, symbols, notional}. Uses the KEYLESS Frankfurter/ECB...