GPT55 Model Gateway
connectsgpt55.558686.xyz
Remote MCP gateway for GPT-5.6 Luna, Soul, Terra, and x402-paid agent tools with no API key.
https://gpt55.558686.xyz/mcpWebsiteNo authMCP 2025-06-18v2026.06.21last checked 18 Oct 2026spoke MCP on 100% of 85 checks (30 days)initialize in 817 msWill my client connect?
Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.
✓Claude CodeConnects
The endpoint answers an anonymous handshake, so no credential is needed.
claude mcp add --transport http gpt55-model-gateway https://gpt55.558686.xyz/mcpClaude Code docs · read on 2026-08-30
✓Claude (claude.ai & Desktop)Connects
The endpoint answers an anonymous handshake, so no credential is needed.
Settings → Connectors → Add custom connector, then paste https://gpt55.558686.xyz/mcp.
Claude (claude.ai & Desktop) docs · read on 2026-08-30
✓ChatGPTConnects
The endpoint answers an anonymous handshake, so no credential is needed.
Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://gpt55.558686.xyz/mcp.
ChatGPT docs · read on 2026-08-30
✓CursorConnects
The endpoint answers an anonymous handshake, so no credential is needed.
{
"mcpServers": {
"gpt55-model-gateway": {
"url": "https://gpt55.558686.xyz/mcp"
}
}
}Cursor docs · read on 2026-08-30
✓VS Code (Copilot)Connects
The endpoint answers an anonymous handshake, so no credential is needed.
{
"servers": {
"gpt55-model-gateway": {
"type": "http",
"url": "https://gpt55.558686.xyz/mcp"
}
}
}VS Code (Copilot) docs · read on 2026-08-30
How to authenticate
Checked against the endpoint by our probe on 18 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.
| Scheme | No auth |
|---|---|
| Protected-resource metadata | ✕Not found Without it a client has to guess where the authorization server lives. |
| Anonymous access | Handshake succeeds; 214 tools listable |
Tools
Contract history
Instructions rewritten: gpt55_balance_topup, https://gpt55.558686.xyz/.well-known/x402, https://gpt55.558686.xyz/buyer-guide.json, https://gpt55.558686.xyz/integrations.json, https://gpt55.558686.xyz/openapi.json. The description an agent follows changed; the callable contract may not have.
Breaking: chat_gpt_5_5, chat_gpt_5_6_soul, chat_gpt_5_6_terra, gpt55_balance_metered_chat_completion
Breaking: chat_gpt_5_3_codex, chat_gpt_5_4, chat_gpt_5_5, chat_gpt_5_6_soul, chat_gpt_5_6_terra, chat_gpt_6_sol, gpt55_balance_metered_chat_completion
Breaking: chat_gpt_5_6_luna, chat_standard
Instructions rewritten: chat_gpt_5_3_codex, chat_gpt_5_4, chat_gpt_5_5, chat_gpt_5_6_luna, chat_gpt_5_6_soul, chat_gpt_5_6_terra, chat_standard, gpt55_answer, gpt55_answer_mini, gpt55_answer_plus, gpt55_answer_professional, gpt55_answer_standard, gpt55_balance_metered_chat_completion, gpt55_balance_topup, gpt55_base64_codec, gpt55_base64_codec_get, gpt55_case_convert, gpt55_case_convert_get, gpt55_code_review, gpt55_code_review_mini, gpt55_code_review_plus, gpt55_code_review_pro, gpt55_code_review_professional, gpt55_code_review_standard, gpt55_color_convert, gpt55_color_convert_get, gpt55_diff_lines, gpt55_diff_lines_get, gpt55_domain_extract, gpt55_domain_extract_get, gpt55_eip712_signature_risk_decoder, gpt55_eip712_signature_risk_decoder_get, gpt55_email_normalize, gpt55_email_normalize_get, gpt55_evm_transaction_risk_decoder, gpt55_evm_transaction_risk_decoder_get, gpt55_evm_wallet_balance, gpt55_evm_wallet_balance_get, gpt55_extract_json, gpt55_extract_json_mini, gpt55_extract_json_plus, gpt55_extract_json_professional, gpt55_extract_json_standard, gpt55_github_repository_supply_chain_evidence, gpt55_gpt55_plus_half_price_subscription, gpt55_hash_text, gpt55_hash_text_get, gpt55_html_entity_codec, gpt55_html_entity_codec_get, gpt55_html_strip, gpt55_html_strip_get, gpt55_http_status, gpt55_http_status_get, gpt55_json_keys, gpt55_json_keys_get, gpt55_json_minify, gpt55_json_minify_get, gpt55_json_validate, gpt55_json_validate_get, gpt55_jwt_decode, gpt55_jwt_decode_get, gpt55_query_parse, gpt55_query_parse_get, gpt55_regex_match, gpt55_regex_match_get, gpt55_rewrite, gpt55_rewrite_mini, gpt55_rewrite_plus, gpt55_rewrite_professional, gpt55_rewrite_standard, gpt55_slugify, gpt55_slugify_get, gpt55_sort_lines, gpt55_sort_lines_get, gpt55_sub2api_balance_ledger_simulator, gpt55_sub2api_official_metered_invoice, gpt55_summarize, gpt55_summarize_mini, gpt55_summarize_plus, gpt55_summarize_pro, gpt55_summarize_professional, gpt55_summarize_standard, gpt55_text_stats, gpt55_text_stats_get, gpt55_timestamp, gpt55_timestamp_get, gpt55_translate, gpt55_translate_batch, gpt55_translate_get, gpt55_translate_mini, gpt55_translate_plus, gpt55_translate_pro, gpt55_translate_professional, gpt55_translate_standard, gpt55_unique_lines, gpt55_unique_lines_get, gpt55_uri_codec, gpt55_uri_codec_get, gpt55_url_links, gpt55_url_links_get, gpt55_url_metadata, gpt55_url_metadata_get, gpt55_url_parse, gpt55_url_parse_get, gpt55_url_text, gpt55_url_text_get, gpt55_uuid, gpt55_uuid_get, gpt55_wallet_signing_safety_pack, gpt55_wallet_signing_safety_pack_get, gpt55_x402_agent_approval_workflow_compiler, gpt55_x402_agent_core_integration_kit, gpt55_x402_agent_core_integration_kit_get, gpt55_x402_agent_credit_line_underwriting_pack, gpt55_x402_agent_data_leak_containment_plan, gpt55_x402_agent_market_data_procurement_firewall, gpt55_x402_agent_payment_approval_pack, gpt55_x402_agent_payment_authorization_ato_pack, gpt55_x402_agent_payment_due_diligence_pack, gpt55_x402_agent_payment_due_diligence_pack_get, gpt55_x402_agent_payment_policy_compiler, gpt55_x402_agent_procurement_rfp_response_pack, gpt55_x402_agent_runbook_compliance_attestation_pack, gpt55_x402_agent_spend_recurrence_guard, gpt55_x402_agent_spend_simulator, gpt55_x402_agent_task_receipt_outbox, gpt55_x402_agent_treasury_rebalancing_policy, gpt55_x402_agent_wallet_incident_response_pack, gpt55_x402_agent_wallet_key_rotation_drill, gpt55_x402_agentic_api_red_team_brief, gpt55_x402_ai_crawler_license_enforcement_pack, gpt55_x402_autonomous_procurement_policy_engine, gpt55_x402_base_builder_funding_readiness, gpt55_x402_base_builder_funding_readiness_get, gpt55_x402_batch_quote_inspector, gpt55_x402_batch_quote_inspector_get, gpt55_x402_bazaar_listing_revenue_repair, gpt55_x402_bazaar_search, gpt55_x402_bazaar_search_get, gpt55_x402_buyer_client_adapter_pack, gpt55_x402_buyer_payment_client_implementation_sprint, gpt55_x402_buyer_payment_execution_runbook, gpt55_x402_buyer_prepay_risk_score, gpt55_x402_buyer_prepay_risk_score_get, gpt55_x402_buyer_shortlist, gpt55_x402_buyer_shortlist_get, gpt55_x402_client_compatibility_adapter, gpt55_x402_client_compatibility_adapter_get, gpt55_x402_conversion_forensics_war_room, gpt55_x402_crawler_monetization_kit, gpt55_x402_crawler_monetization_kit_get, gpt55_x402_cross_chain_payment_failover_playbook, gpt55_x402_customer_support_refund_triage_agent, gpt55_x402_data_room_receipt_redaction_pack, gpt55_x402_directory_compliance_repair_pack, gpt55_x402_directory_compliance_repair_pack_get, gpt55_x402_directory_rank_tracker, gpt55_x402_directory_rank_tracker_get, gpt55_x402_directory_trust_evidence_pack, gpt55_x402_discovery_price_compare, gpt55_x402_discovery_price_compare_get, gpt55_x402_enterprise_buyer_onboarding_dossier, gpt55_x402_enterprise_security_questionnaire_autofill, gpt55_x402_flowise_payment_node_blueprint, gpt55_x402_listing_seo_audit, gpt55_x402_listing_seo_audit_get, gpt55_x402_market_benchmark, gpt55_x402_market_benchmark_get, gpt55_x402_mcp_asset_inventory_risk_register, gpt55_x402_mcp_enterprise_rollout_pack, gpt55_x402_mcp_entitlement_receipt_gateway, gpt55_x402_mcp_integration_kit, gpt55_x402_mcp_integration_kit_get, gpt55_x402_mcp_production_launch_audit, gpt55_x402_mcp_tenant_entitlement_isolation_pack, gpt55_x402_mcp_tool_revenue_share_ledger, gpt55_x402_model_arbitrage_router_policy, gpt55_x402_model_procurement_benchmark_pack, gpt55_x402_model_sla_breach_claims_pack, gpt55_x402_opportunity_finder, gpt55_x402_opportunity_finder_get, gpt55_x402_paid_api_contract_test_suite, gpt55_x402_paid_mcp_authorization_bridge, gpt55_x402_payment_failure_doctor, gpt55_x402_payment_failure_doctor_get, gpt55_x402_payment_retry_slo_autopilot, gpt55_x402_payment_slo_monitoring_pack, gpt55_x402_payment_tax_invoice_reconciliation_kit, gpt55_x402_ping, gpt55_x402_prepay_trust_check, gpt55_x402_prepay_trust_check_get, gpt55_x402_private_gateway_deployment_plan, gpt55_x402_procurement_vendor_risk_dossier, gpt55_x402_quote_inspector, gpt55_x402_quote_inspector_get, gpt55_x402_receipt_bound_execution_gate, gpt55_x402_receipt_dispute_pack, gpt55_x402_receipt_dispute_pack_get, gpt55_x402_refund_dispute_resolution_playbook, gpt55_x402_revenue_recovery_agent, gpt55_x402_seller_action_plan, gpt55_x402_seller_action_plan_get, gpt55_x402_seller_intelligence_bundle, gpt55_x402_seller_intelligence_bundle_get, gpt55_x402_seller_price_ladder_optimizer, gpt55_x402_seller_revenue_leakage_forensics_pack, gpt55_x402_settlement_dispute_evidence_lockbox, gpt55_x402_site_audit, gpt55_x402_site_audit_get, gpt55_x402_soc2_payment_control_evidence_pack, gpt55_x402_usage_quota_billing_reconciliation_agent, gpt55_x402_verify_settle_recovery_pack, gpt55_x402_wallet_drain_prevention_firewall, gpt55_x402_wallet_funding_readiness_doctor, gpt55_x402_wallet_funding_readiness_doctor_get, gpt55_x402_wallet_payment_activation_agent, gpt55_x402_wallet_payment_activation_agent_get, gpt55_x402_wallet_receipt_accounting_pack. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: gpt55_x402_bazaar_search, gpt55_x402_bazaar_search_get. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: chat_standard, gpt55_answer, gpt55_answer_standard, gpt55_code_review, gpt55_code_review_standard, gpt55_extract_json, gpt55_extract_json_standard, gpt55_rewrite, gpt55_rewrite_standard, gpt55_summarize, gpt55_summarize_standard, gpt55_translate, gpt55_translate_get, gpt55_translate_standard, https://gpt55.558686.xyz/.well-known/x402-live-prices.json, https://gpt55.558686.xyz/pricing.json, https://gpt55.558686.xyz/use-cases.json. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: chat_gpt_5_6_luna, chat_standard, gpt55_answer, gpt55_answer_standard, gpt55_code_review, gpt55_code_review_standard, gpt55_extract_json, gpt55_extract_json_standard, gpt55_rewrite, gpt55_rewrite_standard, gpt55_summarize, gpt55_summarize_standard, gpt55_translate, gpt55_translate_get, gpt55_translate_standard, https://gpt55.558686.xyz/.well-known/x402-live-prices.json, https://gpt55.558686.xyz/pricing.json, https://gpt55.558686.xyz/use-cases.json. The description an agent follows changed; the callable contract may not have.
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Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.
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