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 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 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 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 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 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 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 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 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 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 facilitator benchmark (cycle 196, x402 $0.001) - GET ?facilitator=&network=&asset=&pay_to=&rounds=N benchmarks the facilitator that EVERY x402 payment funnels through: live /supported capability probe (does it...
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 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 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 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 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 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 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 x402 payment challenge conformance (cycle 204, x402 $0.001) - GET ?url=<SELLER_URL>/<PATH> (default: this seller's own live 402 challenge) parses the 402 PaymentRequired a buyer agent actually reads and checks it fi...
Paid public-holiday business-impact intelligence (cycle 207, x402 $0.001) - GET ?country=US&year=2026 OR ?countries=US,GB,DE,FR OR ?month=12&year=2026 OR POST application/json {country|countries, year}. Uses the KEYLESS...
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 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 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 buyer payment readiness report (cycle 204, x402 $0.001) - GET ?url=<SELLER_URL> (default: self) OR ?sample=N runs a STRICT x402 v2 client against a seller's catalog end to end and reports the exact stage a buye...