{"items":[{"id":68875,"source":"x402_list","source_id":"pennyrail","name":"PennyRail","slug":"pennyrail","description":"Tiny deterministic pay-per-call utilities for autonomous agents: text, JSON, URL, encoding, validation, numeric, time, and public-data operations settled with x402 USDC on Base.","category":"Compute","subcategory":null,"networks":["BSE"],"price_min_usd":0.001,"price_max_usd":null,"status":"online","uptime_24h":100.0,"avg_response_ms":282,"verified":1,"endpoint_count":50,"base_url":"https://pennyrail.vercel.app","website_url":"https://pennyrail.vercel.app","wallet_address":null,"raw_json":"{\"slug\": \"pennyrail\", \"name\": \"PennyRail\", \"description\": \"Tiny deterministic pay-per-call utilities for autonomous agents: text, JSON, URL, encoding, validation, numeric, time, and public-data operations settled with x402 USDC on Base.\", \"base_url\": \"https://pennyrail.vercel.app\", \"website_url\": \"https://pennyrail.vercel.app\", \"category\": \"Compute\", \"source\": \"submitted\", \"status\": \"online\", \"verified\": true, \"payment_ready\": true, \"endpoint_count\": 50, \"min_price_usd\": 0.001, \"networks\": [\"BSE\"], \"networks_caip2\": [\"eip155:8453\"], \"uptime_24h\": 100, \"avg_response_time_ms\": 282, \"last_checked_at\": \"2026-09-02T15:52:25.816Z\", \"created_at\": \"2026-08-31T17:40:32.153Z\", \"assessment\": {\"compliance_grade\": \"A\", \"compliance_passed\": 14, \"compliance_total\": 14, \"compliance_failed_checks\": [], \"compliance_staleness\": {\"probe_failing\": false, \"last_success_at\": \"2026-09-02T15:52:25.822Z\", \"envelope_captured_at\": \"2026-08-31T17:41:07.292Z\"}, \"reliability_uptime_30d\": 100, \"response_p95_ms\": 424, \"price_usd\": 0.001, \"category_percentile\": 32, \"price_stability\": 1, \"price_max_usd\": 0.001, \"category_percentile_max\": 11, \"endpoint_count\": 50, \"distinct_price_count\": 1, \"risk_level\": \"clean\", \"capability_tags\": null, \"summary\": null, \"traction\": {\"status\": \"measured\", \"volume_usd_30d\": 0.037, \"tx_count_30d\": 9, \"unique_buyers_30d\": 2, \"last_settlement_at\": \"2026-08-31T22:25:35Z\", \"top_buyer_share_30d\": 0.9729729729729729, \"trend_7d_vs_30d\": 4.285714285714286, \"shared_payout\": false, \"shared_with\": 0, \"measured_networks\": [\"eip155:8453\"], \"first_settlement_at\": \"2026-08-31T18:35:55Z\", \"volume_usd_all_time\": 0.04, \"tx_count_all_time\": 9, \"median_settlement_usd_30d\": 0.001, \"max_settlement_usd_30d\": 0.02, \"settled_via\": [\"coinbase\"], \"settled_via_detail\": [{\"id\": \"coinbase\", \"volume_usd_30d\": 0.037, \"tx_count_30d\": 9}], \"shared_with_services\": [], \"pro_quota_share\": 1, \"caveat\": \"Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.\", \"all_time_caveat\": \"All-time is floored at the start of our harvest window, not the service full history.\"}, \"updated_at\": \"2026-09-02T12:53:00.617Z\"}}","first_seen_at":"2026-08-31 22:04:43","last_seen_at":"2026-09-02 16:04:38","protocol":"x402","resource_type":"endpoint","grade":"A+","grade_score":100.0},{"id":60619,"source":"x402_list","source_id":"x402-shop-asr-audio-services","name":"x402 Shop ASR Audio Services","slug":"x402-shop-asr-audio-services","description":"ASR audio services: transcribe a podcast feed (RSS) or any direct audio URL into a clean timestamped transcript, optionally with an AI summary (thesis, key points, verbatim quotes). Two modes: synthesis (transcript + summary, from $0.10/30-min block) and transcript (transcript only, from $0.06/30-min block). Exact USDC price quoted in the 402 challenge; pay per job on Base.","category":"AI","subcategory":null,"networks":["BSE"],"price_min_usd":0.01,"price_max_usd":null,"status":"online","uptime_24h":100.0,"avg_response_ms":728,"verified":1,"endpoint_count":1,"base_url":"https://x402.stan01.xyz","website_url":"https://x402.stan01.xyz","wallet_address":null,"raw_json":"{\"slug\": \"x402-shop-asr-audio-services\", \"name\": \"x402 Shop ASR Audio Services\", \"description\": \"ASR audio services: transcribe a podcast feed (RSS) or any direct audio URL into a clean timestamped transcript, optionally with an AI summary (thesis, key points, verbatim quotes). Two modes: synthesis (transcript + summary, from $0.10/30-min block) and transcript (transcript only, from $0.06/30-min block). Exact USDC price quoted in the 402 challenge; pay per job on Base.\", \"base_url\": \"https://x402.stan01.xyz\", \"website_url\": \"https://x402.stan01.xyz\", \"category\": \"AI\", \"source\": \"submitted\", \"status\": \"online\", \"verified\": true, \"endpoint_count\": 1, \"min_price_usd\": 0.01, \"networks\": [\"BSE\"], \"networks_caip2\": [\"eip155:8453\"], \"uptime_24h\": 100, \"avg_response_time_ms\": 728, \"last_checked_at\": \"2026-08-12T09:59:01.572Z\", \"created_at\": \"2026-08-09T22:17:24.464Z\", \"assessment\": {\"compliance_grade\": \"A\", \"compliance_passed\": 14, \"compliance_total\": 14, \"compliance_failed_checks\": [], \"compliance_staleness\": {\"probe_failing\": false, \"last_success_at\": \"2026-08-12T09:59:01.576Z\", \"envelope_captured_at\": \"2026-08-11T12:41:00.806Z\"}, \"reliability_uptime_30d\": 100, \"response_p95_ms\": 1201, \"price_usd\": 0.01, \"category_percentile\": 42, \"price_stability\": 0, \"price_max_usd\": 0.01, \"category_percentile_max\": 20, \"endpoint_count\": 1, \"distinct_price_count\": 1, \"risk_level\": \"clean\", \"capability_tags\": null, \"summary\": null, \"traction\": {\"status\": \"measured\", \"volume_usd_30d\": 1.21, \"tx_count_30d\": 5, \"unique_buyers_30d\": 1, \"last_settlement_at\": \"2026-08-11T12:55:41Z\", \"top_buyer_share_30d\": 1, \"trend_7d_vs_30d\": 4.285714285714286, \"shared_payout\": false, \"shared_with\": 0, \"measured_networks\": [\"eip155:8453\"], \"first_settlement_at\": \"2026-08-09T21:49:09Z\", \"volume_usd_all_time\": 1.21, \"tx_count_all_time\": 5, \"median_settlement_usd_30d\": 0.3, \"max_settlement_usd_30d\": 0.5, \"settled_via\": [\"coinbase\"], \"settled_via_detail\": [{\"id\": \"coinbase\", \"volume_usd_30d\": 1.21, \"tx_count_30d\": 5}], \"shared_with_services\": [], \"pro_quota_share\": 1, \"caveat\": \"Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.\"}, \"updated_at\": \"2026-08-12T05:53:00.349Z\"}}","first_seen_at":"2026-08-10 04:03:52","last_seen_at":"2026-08-12 10:04:46","protocol":"x402","resource_type":"endpoint","grade":"B","grade_score":81.0},{"id":60618,"source":"x402_list","source_id":"api-acre","name":"API Acre","slug":"api-acre","description":"Thirty-five pay-per-call x402 APIs for web and document analysis, structured-data transformation, developer audits, SEC filings and financial facts, and EVM utilities. Settles USDC on Base through CDP with machine-readable schemas and samples.","category":"Data","subcategory":null,"networks":["BSE"],"price_min_usd":0.001,"price_max_usd":null,"status":"online","uptime_24h":100.0,"avg_response_ms":71,"verified":1,"endpoint_count":35,"base_url":"https://apiacre.com","website_url":"https://apiacre.com","wallet_address":null,"raw_json":"{\"slug\": \"api-acre\", \"name\": \"API Acre\", \"description\": \"Thirty-five pay-per-call x402 APIs for web and document analysis, structured-data transformation, developer audits, SEC filings and financial facts, and EVM utilities. Settles USDC on Base through CDP with machine-readable schemas and samples.\", \"base_url\": \"https://apiacre.com\", \"website_url\": \"https://apiacre.com\", \"category\": \"Data\", \"source\": \"submitted\", \"status\": \"online\", \"verified\": true, \"endpoint_count\": 35, \"min_price_usd\": 0.001, \"networks\": [\"BSE\"], \"networks_caip2\": [\"eip155:8453\"], \"uptime_24h\": 100, \"avg_response_time_ms\": 71, \"last_checked_at\": \"2026-08-12T09:59:04.733Z\", \"created_at\": \"2026-08-09T22:17:24.630Z\", \"assessment\": {\"compliance_grade\": \"A\", \"compliance_passed\": 14, \"compliance_total\": 14, \"compliance_failed_checks\": [], \"compliance_staleness\": {\"probe_failing\": false, \"last_success_at\": \"2026-08-12T09:59:04.737Z\", \"envelope_captured_at\": \"2026-08-11T13:45:05.410Z\"}, \"reliability_uptime_30d\": 99.5, \"response_p95_ms\": 108, \"price_usd\": 0.001, \"category_percentile\": 10, \"price_stability\": 0, \"price_max_usd\": 0.35, \"category_percentile_max\": 91, \"endpoint_count\": 35, \"distinct_price_count\": 10, \"risk_level\": \"clean\", \"capability_tags\": null, \"summary\": null, \"traction\": {\"status\": \"measured\", \"volume_usd_30d\": 1.77, \"tx_count_30d\": 55, \"unique_buyers_30d\": 2, \"last_settlement_at\": \"2026-08-11T18:41:57Z\", \"top_buyer_share_30d\": 0.9694915254237287, \"trend_7d_vs_30d\": 4.285714285714285, \"shared_payout\": false, \"shared_with\": 0, \"measured_networks\": [\"eip155:8453\"], \"first_settlement_at\": \"2026-08-09T00:10:59Z\", \"volume_usd_all_time\": 1.77, \"tx_count_all_time\": 55, \"median_settlement_usd_30d\": 0.01, \"max_settlement_usd_30d\": 0.35, \"settled_via\": [\"coinbase\"], \"settled_via_detail\": [{\"id\": \"coinbase\", \"volume_usd_30d\": 1.77, \"tx_count_30d\": 55}], \"shared_with_services\": [], \"pro_quota_share\": 1, \"caveat\": \"Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.\"}, \"updated_at\": \"2026-08-12T05:53:00.745Z\"}}","first_seen_at":"2026-08-10 04:03:52","last_seen_at":"2026-08-12 10:04:46","protocol":"x402","resource_type":"endpoint","grade":"A+","grade_score":100.0},{"id":60617,"source":"x402_list","source_id":"recurrence-expander","name":"Recurrence Expander","slug":"recurrence-expander","description":"Turn RFC 5545 RRULEs and cron expressions into exact UTC instants. IANA timezones and daylight saving are handled correctly. The two hard cases are flagged by name. A spring-forward time that never happens is flagged nonexistent. A fall-back time that happens twice is flagged ambiguous. Results are deterministic and reproducible. Every response reports the tzdata and library versions it used. Every response also carries an Ed25519-signed reproducibility receipt. The receipt binds the input hash, the output hash and the engine versions. WHAT YOU ARE NOT BUYING: secrecy. You can expand the rule yourself and check every instant we return. The fee buys current timezone data, the two daylight-saving edge cases handled rather than assumed, and a reproducible record of which versions produced the answer. Free preview endpoint at /v1/preview. Operated by Oddments. Paid per call in USDC on Base via x402.","category":"Data","subcategory":null,"networks":["BSE"],"price_min_usd":0.02,"price_max_usd":null,"status":"online","uptime_24h":100.0,"avg_response_ms":1137,"verified":1,"endpoint_count":1,"base_url":"https://s1.oddments.ai","website_url":"https://oddments.ai/","wallet_address":null,"raw_json":"{\"slug\": \"recurrence-expander\", \"name\": \"Recurrence Expander\", \"description\": \"Turn RFC 5545 RRULEs and cron expressions into exact UTC instants. IANA timezones and daylight saving are handled correctly. The two hard cases are flagged by name. A spring-forward time that never happens is flagged nonexistent. A fall-back time that happens twice is flagged ambiguous. Results are deterministic and reproducible. Every response reports the tzdata and library versions it used. Every response also carries an Ed25519-signed reproducibility receipt. The receipt binds the input hash, the output hash and the engine versions. WHAT YOU ARE NOT BUYING: secrecy. You can expand the rule yourself and check every instant we return. The fee buys current timezone data, the two daylight-saving edge cases handled rather than assumed, and a reproducible record of which versions produced the answer. Free preview endpoint at /v1/preview. Operated by Oddments. 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A measured floor, not an estimate.\"}, \"updated_at\": \"2026-08-12T05:53:00.220Z\"}}","first_seen_at":"2026-08-10 04:03:52","last_seen_at":"2026-08-12 10:04:46","protocol":"x402","resource_type":"endpoint","grade":"B","grade_score":73.0},{"id":60616,"source":"x402_list","source_id":"fiatdock-marketplace","name":"FiatDock Marketplace","slug":"fiatdock-marketplace","description":"An MCP marketplace where AI agents discover and pay for other people's MCP services per call in USDC over x402. Payment settles directly buyer-wallet to seller-wallet on Base — non-custodial, no accounts, no API keys, no subscriptions. 33 services are listed today (24 currently buyable); agents browse them with the free search_services tool and pay with call_service. FiatDock also runs 12 first-party paid endpoints of its own: Base chain reads (gas, blocks, balances, tx status, ERC-20 metadata) from $0.001, token-safety and rug screening, address intelligence, a full token report, and a non-custodial USDC-to-bank ramp. Five tools are free and need no wallet at all.","category":"Blockchain","subcategory":null,"networks":["BSE"],"price_min_usd":0.001,"price_max_usd":null,"status":"online","uptime_24h":100.0,"avg_response_ms":97,"verified":1,"endpoint_count":12,"base_url":"https://fiatdock.com","website_url":"https://fiatdock.com","wallet_address":null,"raw_json":"{\"slug\": \"fiatdock-marketplace\", \"name\": \"FiatDock Marketplace\", \"description\": \"An MCP marketplace where AI agents discover and pay for other people's MCP services per call in USDC over x402. Payment settles directly buyer-wallet to seller-wallet on Base \\u2014 non-custodial, no accounts, no API keys, no subscriptions. 33 services are listed today (24 currently buyable); agents browse them with the free search_services tool and pay with call_service. FiatDock also runs 12 first-party paid endpoints of its own: Base chain reads (gas, blocks, balances, tx status, ERC-20 metadata) from $0.001, token-safety and rug screening, address intelligence, a full token report, and a non-custodial USDC-to-bank ramp. Five tools are free and need no wallet at all.\", \"base_url\": \"https://fiatdock.com\", \"website_url\": \"https://fiatdock.com\", \"category\": \"Blockchain\", \"source\": \"submitted\", \"status\": \"online\", \"verified\": true, \"endpoint_count\": 12, \"min_price_usd\": 0.001, \"networks\": [\"BSE\"], \"networks_caip2\": [\"eip155:8453\"], \"uptime_24h\": 100, \"avg_response_time_ms\": 97, \"last_checked_at\": \"2026-08-12T09:59:01.476Z\", \"created_at\": \"2026-08-09T22:17:25.662Z\", \"assessment\": {\"compliance_grade\": \"A\", \"compliance_passed\": 14, \"compliance_total\": 14, \"compliance_failed_checks\": [], \"compliance_staleness\": {\"probe_failing\": false, \"last_success_at\": \"2026-08-12T09:59:01.480Z\", \"envelope_captured_at\": \"2026-08-09T22:18:01.345Z\"}, \"reliability_uptime_30d\": 97.1, \"response_p95_ms\": 159, \"price_usd\": 0.001, \"category_percentile\": 14, \"price_stability\": 0, \"price_max_usd\": 0.05, \"category_percentile_max\": 69, \"endpoint_count\": 12, \"distinct_price_count\": 5, \"risk_level\": \"clean\", \"capability_tags\": null, \"summary\": null, \"traction\": {\"status\": \"measured\", \"volume_usd_30d\": 0.029, \"tx_count_30d\": 11, \"unique_buyers_30d\": 2, \"last_settlement_at\": \"2026-08-11T18:09:59Z\", \"top_buyer_share_30d\": 0.9655172413793103, \"trend_7d_vs_30d\": 4.2857142857142865, \"shared_payout\": false, \"shared_with\": 0, \"measured_networks\": [\"eip155:8453\"], \"first_settlement_at\": \"2026-08-09T01:02:37Z\", \"volume_usd_all_time\": 0.03, \"tx_count_all_time\": 11, \"median_settlement_usd_30d\": 0.001, \"max_settlement_usd_30d\": 0.01, \"settled_via\": [\"coinbase\"], \"settled_via_detail\": [{\"id\": \"coinbase\", \"volume_usd_30d\": 0.029, \"tx_count_30d\": 11}], \"shared_with_services\": [], \"pro_quota_share\": 1, \"caveat\": \"Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.\"}, \"updated_at\": \"2026-08-12T05:53:00.344Z\"}}","first_seen_at":"2026-08-10 04:03:52","last_seen_at":"2026-08-12 10:04:46","protocol":"x402","resource_type":"endpoint","grade":"A+","grade_score":100.0},{"id":60615,"source":"x402_list","source_id":"bykaranteli-crypto-derivatives-data","name":"ByKaranteli Crypto Derivatives Data","slug":"bykaranteli-crypto-derivatives-data","description":"Pay-per-call crypto derivatives depth: multi-exchange liquidation map levels, Deribit options tape history, and VPIN order-flow toxicity history for BTC, ETH and SOL. 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A measured floor, not an estimate.\"}, \"updated_at\": \"2026-08-12T12:03:00.201Z\"}}","first_seen_at":"2026-08-10 04:03:52","last_seen_at":"2026-08-12 16:04:08","protocol":"x402","resource_type":"endpoint","grade":"A+","grade_score":94.0},{"id":60614,"source":"x402_list","source_id":"ask-cairn","name":"Ask Cairn","slug":"ask-cairn","description":"Paid answers from Cairn, a fully disclosed autonomous AI agent running a public experiment at cairnwake.com. Pay 1.5 USDC via the x402 exact scheme on Solana (or 0.02+ SOL with a memo) and the question gets a researched answer plus a permanent page in the agent public record. The same rail sells x402 conformance reports (25 USDC: hostile-payload battery, one real settlement with the agent own USDC, permanent ed25519-signed report) and commissioned sealed-prediction experiments (100-500 USD by scope). 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