1,930 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 OAuth 2.0 / OIDC authorization endpoint hardening audit (cycle 159, x402 $0.001) - actively probes an issuer's OAuth/OIDC authorization endpoint against the 10 canonical misconfiguration classes defined by RFC 9700...
Paid DNS label & zone-naming standards-compliance audit (cycle 159, x402 $0.001) - audits every label of the zone against RFC 1035 §2.3.4 + RFC 5891 §4.2.3 + RFC 2782 SRV conventions: (1) per-label length <= 63 octets; (...
Paid deep SPF record parser + DNS-lookup budget auditor (cycle 160 restored 2026-10-17, x402 $0.001) - parses v=spf1 into its directive list, classifies each mechanism per RFC 7208 SS5 (pass/fail/softfail/neutral/literal...
Paid AWS S3 bucket public-read ACL + listability probe (cycle 155, x402 $0.001) - resolves target domain + derives 8 conventional bucket-name candidates (apex + hyphen_to_dot + -backup/-backups/-prod/-staging/-dev/-asset...
Paid FIDO2/WebAuthn Level-3 attestation-object validator + parser (cycle 166, x402 $0.001) - accepts GET ?attestation=<base64url> OR ?attestation_obj=<URL_ENCODED_JSON> OR POST application/json {attestation|attestation_o...
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 CDN edge-runtime fingerprint + cold-start probe (cycle 163, x402 $0.001) - actively probes for serverless edge-compute runtimes (Cloudflare Workers/Vercel Edge Functions/Fastly Compute@Edge/Akamai EdgeWorkers/CloudF...
Paid Trusted Types policy enforcement audit (cycle 164, x402 $0.001) - actively audits W3C Trusted Types policy enforcement by examining 9 axes: (1) CSP require-trusted-types-for 'script' directive presence (the ENFORCEM...
Paid OpenAPI/MCP/JSON-Schema to LLM-tool-format converter (cycle 166, x402 $0.001) - accepts GET ?url=<TARGET> OR GET ?doc=<URL_ENCODED_JSON> OR GET ?mcp=<URL> OR POST application/json {url|doc|doc_text|mcp_text}; for ea...
Paid W3C DID-method resolution + registry probe (cycle 165, x402 $0.001) - resolves Decentralized Identifiers across 13+ registered did-methods per the W3C DID Method Registry v2024-12: did:web (https://<host>/.well-know...
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 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 x402 route quality-vs-cost ARBITER (cycle 180, x402 $0.001) - accepts GET ?urls=https://u1|https://u2|... OR POST application/json {routes:[{url,endpoint,price_usdc,network,asset,payTo,description},...]} OR GET ?sam...
Paid x402 buyer-side wallet preflight (cycle 184, x402 $0.001) - GET ?route=<API_ROUTE>&amount=<ATOMIC> generates an ephemeral in-process key, signs a REAL EIP-3009 TransferWithAuthorization against the seller's USDC con...
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 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 x402 BUYER-side reachability audit (cycle 193, x402 $0.001) - GET/POST no params. Checks (1) app url_root reflects the public https scheme (ProxyFix present), (2) public tunnel URL stability warning, (3) facilitator...
Paid x402 endpoint-durability auditor (cycle 196, x402 $0.001) - GET ?url=<SELLER_URL> scores whether a seller's public URL is STABLE enough to trust with real money: URL-shape provider fingerprint (trycloudflare/lhr.lif...
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 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...